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A Journal of VHF-UHF Radio Technology & Engineering 

tfj Electronic addresses: ^Internet e-mail: bcheekgcts. com 
fiD CompuServe: 74107,1176 SDFidoNet: 1:202/731 

WWW: http: / /ourworld. conpuserve. com/homepages/bcheek 
FTP Site: & 

Pu Wished at 

COMMtttmic* Engineering - PO So* 262478 * San Diego, C A 92196 
Publisher/Editort Bill Cheek a.k.a. "Doctor Rigormortis" 
Administrator: Cindy Cheek a>k.a. "Sunbunny” 

Copyright © 1991-96 <AU rights reserved** ISSN 1061-9240 
Volume 5 Number 10 S5.00 



~ Pink means it’s time! ~ 

It’s that time again; time to renew your 
subscription if it’s about to run out. You 
can tell in two ways: a Jlorescent pink 
slash will show on the expiration date of 
your label if it’s about to expire, and just 
in case we missed some, expired label 
dates will say EXPIRES: 11/30/95 . 

As has been our custom, if you do not 
plan to renew, send us a note, card, or 
email saying why not and we’ll send one 
more issue at no cost to you, just to say 
THANKS for trying us out. 

Also in keeping with tradition, if your 
budget is strained and you can’t afford to 
renew right away, just tell us, and we’ll 
make sure you get one more issue on 
time while you’re getting things settled. 


This is the last issue of Vol-5, slightly 
late and out of kilter with the desired 
mailing schedule. We were thrown off 
track months ago, thanks to health 
problems and a rush of business matters 
that required keen attention. Tilings 
have settled back into a dull roar now, 
and the health hasn’t gotten worse. We 
should be able to get back on track at a 
rate of about one issue per month. 

I have a series of medical tests and 
evaluations starting March 1, and there 
is no telling how that will impact my 
schedule, but I don’t foresee anything to 
put a screeching halt to our operations. 
We have a substantial backlog of 
material for you. to cover several issues, 
even if I never hit another key, so 
prospects look good from all angles. 

You can relax because subscriptions are 
guaranteed several ways, the first of 
which is you cancel at any time for a pro¬ 
rated refund of unsent issues, and two, 
whether or not we’re on time, each 
subscription is guaranteed the proper 
number of issues before expiration._ 

- An Editorial - 

Would you believe we’ve run out of 
things to write about? No? Well, good, 
because we haven’t. But we are facing a 
big uncertainty of what to write about. 
And you can help. You have to help. 
This magazine is for you, but I’m no 
longer sure of what you want. The face 
of scanning is changing, and the WSR is 
going to become an anachronism in 
another year or so unless I do something 
about it now. We have to shift gears and 
directions a little and you have to tell me 
where to go. But first, read on and get a 
feel for what we’re feeing ahead. 

Scanner hacking and re-engineering, our 
prime focus, began in Sept, 1986, when I 
got a brand spanking new PRO-2004 and 
probed its innards for some way to 
liberate the cellular bands that had been 
deliberately blocked just before release. 
(If you check the RS 1987 catalog , you 'll 
see where it advertises continuous 
coverage from 760-1300 MHz.) It was 
supposed to be continuous coverage, too, 
but pressure from industry and 
government forced a last-minute decision 
from Radio Shack to block the coverage. 
(1 knew it had to be restorable.) 

I knew, because in 1982, I found some 
diodes to clip or add in my PRO-2002 
that "'restored' the "non-existent" 
government band of 380-420 MHz! I 
also found that 806-900 MHz could be 
made to appear in the display, though 
reception was not possible due to RF 
design cutoff at 512 MHz. 

I didn’t tell anyone then of my curious 
discoveries, because there was no forum 
to tell and there seemed only a passing 
interest in scanners and scanning at that 
time. There certainly was little or no 
interest in scanner hacking anyway. 
Besides, the rave was Citizen’s Band and 
scanners were only incidental. I never 
really gave much thought to the 
uniqueness of my PRO-2002. I liked it, 

but few of my visitors ever gave it a 
second glance or asked about it. 

The PRO-2004 was quite the different 
story in Sept-86, as word spread of its 
cellular capability. At least several 
people independently “discovered” the 
retrofitted blocking diode. Our published 
instructions to ease the restoration for all 
users helped fuel the fires of hacking. 

And lo! The diode switch matrix of the 
PRO-2004 just begged for exploration 
and mining, and gold was found, almost 
simultaneously by yours truly and sev eral 
others. The PRO-2004 yielded up 100 
extra channels and a 25% speed 
increase, just for adding a couple of 

diodes! The rage was on . 

Several other scanners gave up 
interesting “secrets” so the hobby 
magazines of the times were loaded with 
exciting discoveries. By 1991. the 
scanner market had grown by leaps and 
bounds. The PRO-2004 had evolved into 
the PRO-2006 that reigned supreme for 
four years until it was officially 
discontinued in 1994. 

The TDDRA Act of 1994 closed the door 
to the exciting domain of hacking bv 
forbidding “ easily cellular modified' 
scanners. The new PRO-2035 and now 
the PRO-2042, while definitely retaining 
much of the successful PRO-2004/5/6 
design, failed to generate any excitement 
in the scanner community. Cellular 
access was over, and so it seemed, other 
easily performed hacks. 

That’s were we sit today. The present 
crop of scanners are not capable of much 
in the way of improvement, though the 
PRO-2035, PRO-2042, PRO-43. PRO- 
26, and PRO-60 all offer slight 
possibilities to those willing to work for 
slight gains. Uniden scanners are 
typically the same as ever...blah. if they 
don’t come with what you want. 

Uniden clearly offers a decent scanner or 
two, as do AOR and Trident, but good 
grief, the costs! Optoelectronics offers 
some potentially exciting add-ons for the 

1/31/96- 11:08 PM-Page 1 

AR-8000 and other scanners, but again, 
the costs! Sky-high! 

In a word, slowly but surely, we are 
being forced to buy ready-inade stuff to 
meet our heart’s fondest desires. No, 
we’re not done hacking yet, but the 
handwriting is on the wall. The faces of 
scanners and scanning are changing. 

Yes, scanning is changing, too. First, 
the people are changing. Several years 
ago, scannists were a healthy mix of 
middle and upper class people with 
professional and technical backgrounds. 
The growth of the scanning hobby 
brought in waves of some very low class 
people, including drug peddlers and 
other riffraff from all walks of life. The 
people of scanning are no longer the 
unified, close-knit community of several 
years ago. The good guys are still here, 
but so are “bad guys”: people with no 
regard for truth; ethics; and character. 
The scanning process is changing. See, 
trunked radio systems are the rave of 
every' community. Trunked radio systems 
have been around for the better part of 
ten years, but the means of following a 
trunked conversation hasn’t changed a 
lick. It can’t change. Law won’t allow it. 
You see, the computer software that 

controls trunked radio systems, typically 
from Motorola, GE, and E.F. Johnson, is 
proprietary and copyrighted. It is not 
possible for scanners to “follow” trunked 
communications for at least two reasons: 

1. Tlie software is proprietary and not 
released to the public. It is also encoded 
and therefore not decipherable. Scanner 
mfgrs couldn’t make a trunked follower 
scanner if they wanted to. 

2. It is illegal to detect and decode radio 
transmissions not intended for the general 
public (ECPA of 1986) 

More and more radio communications 
will be moving to the trunked concept in 
the coming years. Scanning them will be 
a lot less fun. When pursuits are not fun, 
people bail out. When people bail out, 
markets shrink. Remember that. 

We all know that cellular comms is 
moving to digital format, which will 
eliminate any further possibility of 
monitoring there. When that digital 
technology is proven and established, 
many other radio services will move into 
the digital realm. Even if they don’t use 
proprietary methods, it will be tough or 
not fun to scan these signals, except in 
special case situations. In a word, plain 

voice communications is rapidly headed 
to oblivion. I’m sure some public 
services like NOAA weather broadcasts 
will remain in plain voice for a while, so 
we can always listen to them, I guess. © 
Oh, and digital signals can be encrypted 
with a $50 module that defies most 
reasonable attempts at decryption. 
Everything will be encrypted one of these 
days. That NOAA weather broadcast is 
starting to look pretty good, huh? 

Back to the people....the last 8 years of 
exciting hack adventures spawned an 
urban legend that all scanners can be 
hacked into firebreathing turbowhoppers, 
as evidenced by hundreds of questions all 
over the networked computer forums, 
something to the effect” 

’ What mods are available for my SnakeBite 
XR-65 handheld scanner? It has ten 
channels and covers 30-138 and 400-512 
MHz. I want 2000 channels and complete 
coverage from 1 MHz to 2 GHz with SSB.' 
Yeah, rrr-i-i-i-ght, pal. You guys think I 
am joking? I’m not. These people have 
heard the urban legend, and they knowl 
The mere act of telling them its not 
possible angers many and deflates others. 
Now get this: Chuck Gysi, the new 
editor of “Popular Communications ” 

says in part, in the January ’96 issue, in 
response to a reader lamenting his loss of 
interest in radio: 

*.._ a very interesting question that 

paused me to stop and think, too. Like, when 
was the last time I operated on HF, when 
was the last time I ragehewed on VHF or 
UHF, or when I last actually sat down for 
more than five minutes in front of any radio! 
Well, I find myself behind the computers) 
for many hours of every day. And I am doing 
e-mail, writing World Wide Web pages on 
the Internet, cruising newsgroups, etc. And 
with things like Iphone on the market now, I 
suppose it won't be long before I am 
chatting via voice on the Internet, tool 
Scary thought ... maybe I really don't need 
that antenna farm out in the back 40 

Gysi may have taken a stab at humor, but 
believe me, he was as serious as a heart 
attack, whether he knew it or not. 

The deep implications of what he may 
have meant are painfully clear to me. 
We are spending more time at our 
computers having as much or more fun 
than at the radios; and otherwise doing 
the same things as we do with radio! 
Mr. Gysi may not have expressly meant 

it, but the fact is, most everything done 
with a radio can be done with a computer 
easier, cheaper, and quite possibly with 
more fun and certainly with a greater 

Oh, sure, there are exceptions. I am 

talking about the rule. No, there is 

no substitute for catching a ship in 
trouble on the high seas, or snagging an 
elusive shortwave broadcast from Outer 
Mongolia; or listing to the cops and 
robbers in action. Trouble is, ships at 
sea have more effective means of 
announcing emergencies now. Outer 
Mongolia’s need to use shortwave radio 
for entertainment and propaganda is 
drawing to a close; and the cops and 
robbers will soon both be encrypted. 
Now do you see my concerns? 

Otherwise, we can do most everything 
else from our computers over the Internet 
and other networked comm routes. Fun? 
Yer dem tootin’, it’s fun, especially 
when you can save, process, retrieve and 
use information acquired from 
networked sources; quite difficult to 
efficiently do with a radio signal 
squeaking through the noise, and when 
the kids cobbed your last cassette tape. 
Radio is changing ivith the times. Sure. 

there will be a few hobby aspects of it 
that will last for a long time; like DXing 
your favorite NOAA weather station: 
perhaps digging out some neat fax 
signals from satellites; maybe some radio 
astronomy; SETI, shuttle broadcasts, and 
things like that. I’m talking specialized 
aspects of monitoring that will survive 
the times for a while. If you can go 
specialized, then great! But the days of 
listening to cops, robbers, fire engines, 
taxis, drug deals, railroads, military, and 
even aeronautical communications are 
rapidly coming to a crossroads from 
which notliing will ever be the same. 

So what now? Ladies and gentlemen: 
fire up your newfangled computing 
machines. Whatever there is left of radio 
is going to involve computers, more and 
more, to either get the comms in the first 
place, or at least to enhance and simplify 
the process of monitoring. Or, at the 
very least, offer a means of staying on 
top of all the coming changes by putting 
you in touch with many other scannists. 
Now let me hear from you with ideas or 
suggestions of where you want the WSR 
to go for the near and mid-term future; 

i/ 3 i/ 96 ~ nos pm- The “World Scanner Report” © 1991-96; Volume 5, No 10; Page 2 


Someone on tlie Internet 
? recently said Uniden was 
1 looking for what consumers 
wanted in a scanner. (I’ll 
bet...Uniden doesn’t care 
what people want....). 
But, in the offhand chance, 
the message was serious, I 
posted a list of fifty things I want in a 
scanner. Now you guys tell me if I left 
anything out. Will Uniden listen? 

1 AGC-controlled front end and IF stages 

2 Alphameric storage; per channel 

3 Attenuator, front-end electronic; programmable 

4 Bandpass filtered front end: 7-filters minimum 

to cover 25-1300 MHz; minimum. 

5 Baseband audio output (line level; unfiltered) 

6 Beep; adjustable 

7 Carrier Operated Relay (contact closure output) 

8 Computer Interface; EIA-232 or open design; 

19.2+kBps; 2-way control & data acquisition 

9 Computer interface port; infrared;19.2+kBps; 

2-way control & data acquisition 

10 Computer software for 2-way interface; BASIC 

source code provided 

11 Data/Tone Squelch; reject non-voice signals 

12 Decoder, CTCSS 

13 Decoder, DTMF 

14 Decoder, Tone; user adjustable, 300 Hz-6 kHz 

15 Delay; adjustable; programmable; 0-15 sec 

16 Disc 

al LSI 
le delay/continuous 

17 Display lighting; indiglo; tii 

18 Double balanced mixers 

19 Duplicate entry detector 

20 Event counter, per channel 

21 Event Log in Buffer Memory, w/computer dump 

22 Filtered IF sections 

23 Fine-tuning; adj; analog or digital in 10 Hz steps 

24 GaAsFET low noise front end for VHF & up 

25 Human engineered 

26 IF bandwidth; programmable: 5 kHz; 7.5 kHz; 

10 kHz; 15 kHz; 25 kHz; 50 kHz; 100 kHz; 
200 kHz 

27 Keyboard; affirmative action; large keys 

28 Ixx;kOut Reviewer 

29 Manual Up/Down 

30 Metering; Center Tuning; analog or 7-seg 

31 Metering; Signal Level; analog or 20-seg digital; 


32 Mode settings; User selectable: AM;NFM; 


33 Multiple antenna ports; keyed to bandpass filter 

ranges; programmable 

34 NOAA weather radio alert 

35 Program Organizer, by freq; by alphameric 

codes; by mode; etc 

36 Programmable channels; 200 to 1000 

37 Reject undesired bands from program memory 

38 Reject undesired freqs from program memory 

39 Scan Banks; 50 or more 

40 Scan: Up/Down 

41 Search & Store function with special store banks 

42 Search Banks; 10 or more 

43 Search from any frequency in the display; direct 

search up or down 

44 Search increments; User selectable: 2.5 kHz; 5 

kHz: 10 kHz; 12.5 kHz; 30 kHz; 50 kHz 

45 Search Limits, definable; Up/Down 

46 Sensitivity: 0.25-uV @ 10 dB S+N/N 

47 Sound Squelch; reject dead carriers 

48 Speed: 50-100 ch/sec 

49 Tape Record audio out (line level; voice band) 

50 Triple up conversion 


and no serious bugs have surfaced! Wm95 is 
here to stay and growing with the times. 
Win95\s idea! for the hacker/hobbyistl ® 


(Reprinted by permission of the author) 
Foreign Correspondent 
Inside Track On World News 
International Syndicated Columnist & Broadcaster 
Eric Margolis <> 


by Brio MaigolU 16 Hot 08 

There was outrage this week to ohargee that a 
top secret Ottawa upy agency was 
eavesdropping on communications of Canadian 
citizens, as Well as on those of friendly nations. 
This reminds me of Henry Stimson's famous 
remark about espionage. 

When creation of an American spy agency was 
proposed to Secretary of War StlmBon in the 
late 1630's, he sniffed, * gentlemen do not 
read one another’s mail!' 

Modem states have no suoh scruples All 
modem Industrial powers maintain electronlo 
lnteUlgenceOBLINT) operations that listen In to 
phone, fax, telex and modem transmissions 
going In or out of their territories. 

In Canada, the Communications Security 
Establishment (CSE) routinely monitors comms 
of embassies in Ottawa, as well as International 
trafflo. Charges by a former CSE employee that 
the agency listened in to trade talks with 
Mexico and South Korea are perfectly plausible, 
if sharply embarrassing. So, unfortunately, are 
oharges that CSE's big ears also ploked up 
conversations by Canadian citizens. 

Doing the latter Is quite filegaL Yet It’s also 
unavoidable. Modem ELINT technology hovers 
up vast amounts of electronic data across a 
wide frequency spectrum. The data stream Is 
then sifted and analyzed. Inevitably, private 
conversations get sucked Into the system. This 
Is particularly true of Investigations Into 
terrorism, money laundering, and other 
international criminal activities. 

The world's largest ELINT system, America's 
National Security Agency, monitors worldwide 
transmissions. Some are specifically targeted; 
others randomly scanned, using key “buzz’’ 
words that activate surveillance. NSA's big 
ears also pick up “private" communications of 
American and Canadian citizens. 

Much of this Information avalanche remains 
orude data. Neither NBA or CSE has the time, 
manpower or money to listen In to everything. 
The only agency that did was the KOB, during 
the golden dayB of the Soviet Union. 

Random seourity sampling of communications 
inevitably leads to problems. Earlier this year, 

It was revealed that one of Spain's security 
service had monitored the calls of King Juan 
Carlos. Britain's MIS taped calls by members 
of the royal family, Including notably silly drivel 
by the Prinoe, sure CSE has the prime minister 
and all Quebeo separatists on tape. 

That, unfortunately, Is the nature of our 
Increasingly transparent electronlo world. The 
more communications Improve, the less secure 
they become. A citizen's right to private 
communications can no longer be guaranteed. 
Technology has overtaken law. 

At the same time, the Cold War's end left too 
many spies with too little work. Many agencies 
accordingly switohed to commercial spying. 
France’s spy agency, DOSE, was accused of 
bugging first class seats on Air France. Last 
spring, France oharged five CIA agents with 
Industrial espionage, something the French are 
very good at themselves. Russia, Israel and 
China have saved hundreds of millions In ROT 
by stealing American military and civilian 
technology. Now, to the thunder of anguished 
“eeks," It turns out that even squeaky-clean 
Canada may not be above a little commercial 

I suspect that another big ELINT scandal may 
soon erupt, probably In Washington. NSA's big 
ears pick up streams of highly sensitive 
business data that gives its analysts advance 
knowledge of movements on the commodity, 
currency and stock markets. 

Might NSA play the markets to generate 
“special” operating funds? Or the CIA, or the 
US government, for that matter? The 
temptation for modestly-paid government 
employees to sell business Information to 
outside speculators muBt be strong. Nor are 
cash-strapped government agencies above 
temptation. This column believes some “black” 
projects and deep-cover operations may have 
long been financed by secret government 
speculation on world financial markets. 

More “hear no evil" legislation probably won’t 
work. Unless you have high-teoh encryption 
gear, assume all electronlo communications are 

In spite of ell our electronic wizardry, 
whispering remains the safest farm M 
communication. -Eric Margolis 
To receive email Foreign Correspondent send to with this message 

in the body: subscribe foreianc 
Back Issusb: available from: 
For Syndication Information please contact: 

FAX: (416) 9604803 
Erio Margolis 
c/o Editorial Department 
The Toronto Sun 
333 King St. East 
Toronto Ontario Canada M 84 3X0 


i/ 3 i/ 96 ~ 11.08 pm- The ‘World Scanner Report” © 1991-96; Volume 5, No 10; Page 3 



Greetings scanner fans!, this month we 
revisit a classic hack. Bill Cheek’s Data 
Tone Squelch MOD-44 that first 
appeared in the WSR VIN10 issue. The 
DSQ is an answer to those annoying 
non-voice signals in the cellular, 
trunked, and other band segments of the 
spectrum. I built one and it worked, but 
it sometimes would hang. I felt it wasn't 
as good as it could have been. 

But I left it alone until a friend asked me 
to optimize this circuit. I took a closer 
look at it and came up with an 
improvement that makes it almost 100 
percent reliable. Now, I'm not criticizing 
Bill Cheek’s design prowess at all and as 
many of you know I even improve and 
upgrade my own circuits as new info 
becomes available. So grab either the 
WSR V1N10, or Bill’s new book. The 
Ultimate Scanner, where the DSQ is 
also presented, and lets take a walk down 
memory lane and revisit this old friend. 
OVERVIEW: Our DSQ prevents the 
scanner from locking up on most non¬ 
voice signals, including computer 
control, pagers, IMTS tones; anti- 
scanner tones, DES/DVP encryption, 
cellular control, and most other 
obnoxious, annoying, continuous types of 
undesired signals. The scanner will 
momentarily pause on these signals, all 
right, but then pick right up and continue 
on with scanning or searching. Voice 
signals are treated normally. 

scanner’s schematic shows the output of 
the Sound Squelch (SSQ) transistor, 
Q19 or Q21, depending on which 
scanner you have, is a logic zero or +5v 
to the CPU. When Sound Squelch is 
OFF, the SSQ switch puts a ground or 
zero volts to the CPU SSQ pin. This tells 
it to operate normally and the scanner 
just does its usual thing. When the 
switch is open (SSQ-On), that signal can 
go up to a logic high to allow the scanner 
to make decisions over two conditions. 
One is when the SQUELCH is open, the 
SSQ signal bounces up and down in time 

with the audio. This lets the CPU know 
that a signal is received that has audio in it 
and that the CPU should not skip this 
signal. Birdies and dead carriers, however, 
cause a constant logic high on this line 
which tells the CPU that ain’t a valid signal 
is being received. 

If this signal stays high, the the original data/tone squelch circuit 

CPU then decides whether to sc^ner c i rcuitry ;<- bu il d this c i rcuit - H 

scan to next channel or skip to _s*_t—f I 

the next incremented freq in t "' 1 |y l 

the search mode. This is the <4±j y . _^ ~r ; ._L_ i|4> 

basic operation of the circuit ”******■*•'* | + -j±- x.’, <<3 ^ ^ 

and a very clever one at that. [ ] y-- 1 


After gnawing on this and the "SSSm TO || _ 1 

DSQ circuits for a while I had ■ T'! 5 *- 7 jM 

a profound revelation. I !*"j ________ XQ f 

realized tliat there can never » "f\ \ j ^n nn n n n ' ~*^ w 9 7 * 

be a situation with only the l ^ ^9 | 

data squelch function enabled * j x " 

with no sound squelch. This is ; e ~ !j 

because logic circuits can only L - j g* ] 

have 2 levels at their inputs SS| . 

that are valid. A high and a -t j 

low. So the input to the CPU j ISSSh! ’ 
is armed and ready to do its ! 




+5v Reg 

OUT Lug „ i Red 

of IC-8 * i 

(All Scanners) j 

PRO-2004: Q-21 T 
PRO-2005/6: Q-19 
, PRO-2035: Q-21 J 

SOUND : Sky 1 i 

Typical < \ ! j 

Circuit *- 

Differences Nol § OFF '■ Sphc ® 


1. R-2 seems best ol about 12-k. A 10-lc and o 2.2-k in series work fine. 

2. This point is a rectified and filtered OC, proportional to AC input from C-1. 
Voice signals produce on erratic, vorying DC unlike the steady 4+ volts 
produced by data ond continuous tone signols. A voltmeter will prove this out. 

3. C-l should be soldered directly to 1C-5. Use a yellow hookup wire to the DSQ. 

2 /im- 2:08 pm~ The “ World Scanner Report” © 1991-96; Volume 5, No 10; Page 4 







1-uF/35vdc Tantalum 



2.2-uF/35vdc Tantalum 



1N414S/1N914 diodes 



Transistor 2N2222A 









in series okay 









4.7-k Q 



LM-339 Comparator 



•74HC00 Quad NAND 



10-k ohm trim pot 



1C Socket, 14-pin DIP 



Pert board 



Switch, SPST Toggle 


* Not available at Radio Shack 

decision thing with a logic high at the 
input. If the Data squelch is the only 
input to the CPU then only data tones 
will have an effect on the decision which 
will be to keep a logic high on the CPU 
pin and this will cause the CPU to skip 
over all valid voice signals along with 
data tones. So you effectively have no 
action whatsoever. Now if you keep the 
CPU pin low when you are trying to skip 
over data tones and the CPU pin goes 
high when a data tone signal is received 
the scanner will hang there for about 4 
seconds before the signal is skipped. 

This is the same as turning the SSQ 
switch on from off when a birdie is 
received. The scanner will wait for 4 
seconds and then skip the signal. As you 
can see, the only way for the DSQ mod 
to work properly is in synergy with the 
SSQ circuit. That’s why as some of you 
and myself have discovered that the 
original circuit with independent 
switching works the best with both 
options enabled. 

The other problem I found is a subtle but 
profound effect wliich will also cause 
problems in this scenario of the 
independently switched circuit having 
both options enabled and a valid voice 
signal received, the output of the SSQ 
transistor is a logic low but is then fed to 
a diode. The output of the DSQ is also a 
low and it also goes through a diode. A 
diode needs some current to be flowing 
through it to turn it on but in this case 2 
lows or grounds are put on both diodes 
and they are effectively turned off. 

Basically they are not there! A float 
condition is now on the CPU pin of a 
voltage anywhere between lto 3 volts. In 
the digital world this is called an 
indeterminate state and has to be avoided 
at all costs. A “float” condition can not 
guarantee proper decision-making and 
the result is a wishy washy operation. 

OK, Prof, enough of this gobbledygook 
and lets see what’s coming up on the 
instant replay. Referring to the revised 
DSQ circuit,, notice that the diodes are 
gone. This ensures that valid logic 
signals are the only ones in play. The 
outputs of the SSQ and the DSQ circuits 
are fed to NAND gates A and C 
respectively, and then combined into 
gate B and inverted by gate D. This 
whole network of gates becomes a logic 
NOR gate for you techno-weenies. 

I needed a way to enable the DSQ 
function so I used discrete gates instead 
of a real NOR gate. On pin 9 of gate C 
is a switch that will place a low or high 
on pin 9 and this will allow either SSQ 
only if the switch is closed or SSQ and 
DSQ if the switch is in the open position. 
DSQ ANALYSIS: When a data or tone 
signal is detected by the DSQ circuit, a 
high appears on pin 2 of the voltage 
comparator and then appears on pin 10 
of gate C. With pin 9 at a high state a 
logic low is now at pin 5 of gate B. This 
locks out the negative going signals from 
the SSQ circuit from being output at pin 
6 and ultimately at pin 11 of gate D. 
The transistor hanging on the output of 
pin 11 is in the exact configuration as 
the original SSQ circuit. When a logic 
high outputs from pin 11 of gate D, it 
turns on the transistor and causes the 
collector to drop low from 5 volts. 

When the DSQ puts a high at pin 10 of 
gate C a low comes out of pin 8. This 
causes a logic high to come out of pin 6 
of gate B ( that's how NAND gates work .) 
You need 2 highs at the input to get a 
low output. So out of pin 6 of gate B is a 
steady logic high which is inverted by 
gate D to a logic low. A logic low or 
ground at the base of the transistor 
prevents the transistor from being turned 
on, so a logic high on the collector 
passes to the CPU pin to cause the 
offending data tone to be skipped. 

1 tested this new circuit on the radio 
belonging to Ed Smith of Barstow 
California for a week straight and it 

worked magnificently on data tones of 
various services, skipping all of them, 
but holding on valid audio signals as it 

The NAND gate chip can either be a 
74HCOO or a 74HC132 as the pins are 
identical; the 132 being a Schmidt 
Trigger type for cleaner output signals. 
Either works fine. 

In the original alignment instructions for 
the DSQ it was stated that the set voltage 
at pin 4 of the voltage comparator should 
be in the 2 to 3.8 volt range. In practice 
I have found that a setting of about 2.3 
volts yields the most reliable operation of 
the DSQ circuit. The original component 
values of the DSQ were unchanged as 
they are optimum, just the treatment of 
the output signals were messed with. 
This concludes my yam of the Data 
Squelch revisited and I hope you will 
concur that with the new modification, a 
great circuit works even better now. 


That danged oV Professor nagged and 
hounded me for several years with his 
dissatisfaction of my DSQ mod. and 
demed if I could ever clearly see what 
he was talking about. So I just humored 
him a lot to get 'im off my case. 

Looks like he hit on something, though, 
so I will add enough meat ‘n talers here 
so you guys don 7 have to refer to the 
WSR V1N10 or to the Ultimate Scanner 
book for details on the rest of the mod 
that remain unchanged by the Professor. 
ADJUSTMENT OF VR-1 : Push the 
front panel SOUND SQUELCH button 
ON. Turn the SSQ switch OFF and the 
DSQ switch ON. Attach a voltmeter (-) 
to ground and (+) to Pin 5 of U-l. Tune 
the scanner to a strong, noisy data 
channel or to a loud, single tone carrier. 
(Cellular or trunked data channels are 
ideal!) Measure the DC voltage at Pin 5 
of U-l, (4.1-4.5v typical). Calculate 
80% of that voltage; then put the 
voltmeter at Pin 4 of U-l and adjust I 77- 
1 for the 80% level of the above 
measurement. Typically, about 3.6 to 
3.8v. The-exact adjustment isn't too 
critical, but if set too low, voice signals 
will resume SCAN or SEARCH. If set 
too high, then data & tone signals won't 
trigger the SCAN/SEARCH .RESUME. 
Another way to find the optimum setting 

i/ 3 i/ 96 ~ ti .08 pm- The “World Scanner Report” © 1991-96; Volume 5, No 10; Page 5 


R4. R5, R6. Ground 
Orange, Violet, U2, & switch not shown. See schematic 

is to put a voltmeter (+) on Pin 2 of U-l 
and (-) to ground and tune the scanner to 
a cellular or trunked data channel. 
Adjust VR-1, first one way and then the 
other and then to a point so that the 
voltage on Pin 2 of U-l just becomes 
stable with a nice and steady +5 volts. It 
takes a steady +5 volts for about one 
second to trigger the SCAN/SEARCH 
RESUME function, but don't adjust VR-1 
any further than necessary to stabilize 
the DATA/TONE voltage at Pin 2. 

That goofy Professor says to set VR1 for 
+2.3v at Ul-Pin 4. My tests indicate that 
the "80% Rule” remains valid, but 
follow his direction first, and then mine, 
if things “aren ’t right”. Between the two 
of us, we ’ll get you going. 


The most critical part of this mod is the 
rectifier circuit consisting of D-l, D-2, 
R-l, R-2, C-l and C-2 and proper pin 
wiring of the LM-339 and 74HC00 chips. 
Make sure the diode polarities are 
correct (banded end is the cathode). 
Make sure polarities of capacitors are 
correct. Tune the scanner to a strong, 
obnoxious cellular (879 MHz -881 MHz) 
or trunked data signal (851- 866 MHz), 
and measure the DC voltage at Pin 5 of 
U-l. There should be between 4 and 4.5 
volts. You won't measure "too much” 
but too little is possible. I don't know 
what "too little” would be, but 
something could be wrong if the strong 
data signals don‘t produce at least 3v or 
more at Ul-Pin4. VR1 always seems 
best setting Pin 5 to 80% of the strongest 
voltage on Pin 4. 

Check the wiring and components 
mentioned above.. Last but not least is 
the wiring of U1 and U2. The circuit is 

so simple and affirmative in its 
action that you're not likely to 
encounter trouble if you follow 
the diagram and these 

Some PRO-2005's may have a 
chirping or warbling, Morse 
code type of sound on quiet 
channels after this mod has 
been done. If yours exhibits 
this weird sound, change C-l 
from 1.0-uF to 0.1-uF, Radio 
Shack #272-1432. If the 
"tweet” is still there, then 
solder a 1000-pF capacitor (RS 
#272-1032) directly to Pins 4 
and 11 of IC-5 in the scanner. 
Pin 4 should get the (+) lug of the 
capacitor while Pin 11 gets the (-) lug. 
This is a peculiar problem in some PRO- 
2005’s, but it's easy to correct so don't 
worry about it. 

The above photo isn't complete yet, but 
will be after we get your feedback. 

That's it for the New and Improved DSQ 
Mod-44B. Now let’s have YOUR 
feedback on it so the Prof and I can 
debug it and finish the documentation! 


From: Jose Villafane, Bridgeport, CT 
I would like to know what kind of tricks 
you did to your Cobra-2000 to stop 
receiving bleedover. I tried adding a 
second 455 filter in line with the original 
one, as per one of your articles in the 11 
Meter Times and Journal, but it didn’t 
work. I still have massive bleedover. 
Can you point me in the right direction? 
ED REPLY: What do you mean, “it 
didn 't work”? You mean, didn ’t help the 
bleedover, or it didn’t work at all? For 
one thing, that second 455-KHz IF filter 
should be of good quality, and then 
installed between FT-1 and R27. This 
will help a little. The next thing to do, 
and this is the biggie, replace FT-2 with 
a 7.8000 MHz crystal lattice filter 
salvaged from a junked SSB-CB rig that 
used 7.8 MHz in its receiver. A crystal 
lattice filter is . very expensive if 

purchased outright, but dozens of old CB 
rigs used them, including < the Midland 
13-893, 895, and many others. There is 
a crystal lattice filter in the Cobra 2000 
(FT3, but leave it alone!)! ' That one is 
enclosed in heat shrink whereas most are 

sealed in solid metal housings. But 
they’re all about the same size. Anyway, 
replacing that cheapo FT2 with a 7.8 
MHz crystal lattice filter will take care 
of the rest of your bleedover problems. 
One other clue, too....replace the 3SK45 
2 nd Mixer FET with a 3N211 for more 
gain and reduced interference. 

Also, I would like to share something 
that happened to me a few weeks ago, 
where sadness turned into happiness. 
My modified PRO-62 and my Cobra 148 
got stolen out of my van. Five days ago, a 
ham operator friend asked if I wanted to 
buy a scanner, that his friend got from 
Radio Shack. He never even put 
batteries in it, because he thought it was 
a hand transceiver. He told the guy to 
sell it for him. I asked him which one it 
was and he said it was a PRO-26. He 
told me the guy wanted $150 and as soon 
as I got off the phone, I was knocking at 
his door. Can you believe that? A $500 
scanner that just came into the market? 
There is justice after all! 

ED REPLY: Wow! There sure is! 
Thanks for sharing that with us! I’m 
jealous! I’ve been looking for a good 
deal on a PRO-26, myself. But I wonder 
why that fellow didn’t take the scanner 
back for a refund? Radio Shack has a 
no-quibble return policy. Is he dumb? © 


From: John SchleppegrelL Jr.. Columbia. MD 
Dear Mr. Cheek: Back before they went 
out of production, I bought a PRO-43 
scanner as a backup to my PRO-2006. I 
would like to know if you still do 
modifications to the PRO-43. I’m 
especially interested in getting the 
cellular freqs restored, as well as VHF 
low (54-88 MHz). If you do still work 
on the PRO-43, I’d appreciate it very 
much if you would let me know the price 
as well as shipping instructions so 1 
could send mine to you. Also, if you do 
any other mods (I remember there was 
discussion of an LED signal strength 
meter among others), I’d sure like to 
hear about what’s available. Thanks for 
your time. 

ED REPLY: I am doing some bench 
work again but send e-mail or call our 
voice line for a quote and business talk. 
It is possible to install an LED S-meter 
in the PRO-43 though space is tight and 
small LEDs have to be used. I will look 
into that for you and our readers. 

2 / 1 / 96 -2:59pm- The “WorldScanner Report” © 1991-96; Volume 5, No 10; Page 6 

From: Albert Smith. Brooksville. FL 
I recently wrote to you regarding 
restoring cellular to my PRO-43. Thank 
you for the prompt answer, altlio it was 
not what I had hoped for. My PRO-43 
indeed has an “A” in the serial number. 
My way of thinking is for every action 
there is a reaction. Since the company 
acted by deleting cellular, the public 
reaction should be able to restore it. 

It would seem that someone would be 
able to come up with the proper 
procedure to restore cellular to a PRO- 
43A. How about you; will you have a 
restore procedure for the PRO-43A? Or 
could you inform me of who might 
perform the restoration of my PRO-43 A? 

I called Grove Enterprises to order a 
CVR2 converter and was told they were 
discontinued. Would you know who has 
an 800 - 1000MHz converter? 

ED REPLY: The TDDRA of 1984 is a 
law passed by Congress that forbids 
scanners to be easily modifiable for 
cellular reception. Manufacturers 
responded by making it impossible to 
receive cellular. That was the easiest 
way to comply. All they had to do was 
delete the part of the CPU firmware 
(program) that lets the scanner tune the 
cellular frequencies. In the past, that 
code was there, and then programmed to 
be inactive by an external diode. Clip 
the diode and cellular was available. 
But now the code is not there, so there’s 
no way to access the cellular bands by 
any conventional means. See V5N9 for a 
source of regular PRO-43's, in case you 
can find a way to sell your PRO-4 3A, but 
you better hurry; supplies are limited. 
There may be a hokey or kludgey means 
of forcing a scanner to receive cellular, 
but I am not fully aware of the method 
yet, and what I understand so far is that 
such procedures could reduce the 
performance of the scanner in all other 
modes. For more information from the 
people who do this method, contact: 
Cellular Security Group; 47 Causeway St; 

Gloucester, MA 01930 (508) 281-8892 

Last, but not least, that same TTDRA of 
1994 also forbids “converters” and 
other external electronic means of 
letting scanners receive cellular, so 
there are no more converters on the 
market for that capability. You could 
look for a used model, though. _ 

From: Tony Thornton. Mize, MS 
Hi Bill & Cindy: I think an in-depth 
series on computer building and 
upgrading in the WSR is a good idea, the 
M/T articles are 
good also. The 
reason I’m writing 
is that I’ve 
recently read in a 
computer mag or 
two, that a couple 
or more of the big 
manufacturers have started making their 
motherboards, power supplies, etc., odd 
sizes so that only replacement parts are 
available from them. Compaq and 
Packard Bell were two of the companies 
named with the possibility that others 
might follow. Damned if I want to pay 
Packard Bell or Compaq a hundred 
dollars or more for a $20 - $30 power 
supply. I think people that are in the 
market for a new computer should be 
made aware of this so they can look to 
other brands such as Zeos, Gateway, etc. 
that have standard size components. Or 
even better yet, follow your articles and 
build their own, they only have the 
drives, etc., in it that they want, not 
something that a mfg. bought a jillion of 
them for $50 ea. Well, that’s my two 
cents worth. 

ED REPLY: You hit on an excellent 
point about computers. Indeed, certain 
manufacturers deviate from “standards” 
so as to force the customer to stick to the 
“brand”. Compaq and Packard Bell are 
famous for that skullduggery. Packard 
Bell prices are so low that many people 
are attracted without giving a thought to 
future add-ons and upgrades. 

It never occurred to me to put it this way 
before, but just as we hardcore scannists 
buy our radios with the idea of add-ons 
and upgrades, so too, should be buy our 
computers with that same idea in mind. 
Truly, this is the time to build your own 
computer around a 486 CPU because 
the cost of the motherboard and CPU 
are ridiculously low priced, as are the 
add-on cards. In that sense, it doesn't 
matter if you have an older 386 Compaq 
or Packard Bell, because you can junk 
the motherboard and power supply and 
still come out. In fact, a case and power 
supply costs as low as $45, and a hot 
486DX4/I00 chip & motherboard are 
running under $200 now. Add to that 

$200 for a 540-Mb hard drive and 
controller; $90 for a good video card; 
$30 for a high speed serial/comm card, 
and it is conceivable you could be in 
business for well under $600 and a lot 
less than that if you already have a hard 
drive and video card. 

Provided I don't get a lot of negative 
feedback, I plan to run an article or two 
on “rolling your own computer ” soon. 

From: Keith Estev. Canada: I wrote to 
you 4 years ago about a problem I had 
with my Realistic PRO-2004 scanner 
after doing the speed modification from 
your Scanner Modification Handbook . 
Vol-1. Every 4 channels were duplicated, 
every two search banks were the same, 
you could not enter frequencies in some 
channels, frequencies would change in 
some channels, direct search would not 
work, etc. No one seemed to know what 
was the cause. 

Although I am always carelul when 
soldering, I checked the circuit board 
over several times looking for solder 
bridges, open circuits, parts touching, 
etc. I replaced the CPU and all other 
IC’s on the CPU board and the 9 volt 
battery regulator, all to no avail. 

I was tempted many times to buy another 
scanner but didn’t. This summer I 
finally decided I would get a new one the 
next time they put them on sale but I 
thought I would have one more look at 
my 2004, and after more checking for 
open circuits I found one, -I think it was 
between pin 4 on IC504 and pin 52 of 
the CPU. As you know, this is a double¬ 
sided board and where the lead of one of 
the diodes (diode 514?) goes through the 
board is where the circuit on one side 
connects to the circuit on the other side 
and for some reason the connecting foil - 
IN THE HOLE - broke, causing the open 
circuit. The body of the diode was next 
to the hole, making it difficult to check 
continuity at that point, so I replaced the 
diode putting the longer lead in the hole 
then soldered it to the circuit on both 
sides of the board. I turned the scanner 
on and away it went, working perfectly. 

Why the circuit foil broke where it did. 
I’ll never know as the lead of the diode is 
small enough to FALL through the hole. 
Perhaps the foil was cracked and the lead 
caught on it? I don’t know. Anyway, it 
was quite a puzzle but finally sblved! 

2 / 1 / 96 -2:57 pm- The “ World Scanner Report” © 1991-96; Volume 5, No 10; Page 7 

I now have a 400-ch scanner with higher 
speed scan and search, cellular phone 
band, and I have since added the analog 
S-Meter and it all works great! 

I thought I would let you know what did 
happen in case someone else runs into a 
similar problem, and also, you might 
want to warn other hackers that if they 
run into any problems to be sure to check 
those connections where the circuit goes 
from one side of the board to the other. 
It can cause some strange things to 
happen and be quite frustrating. 

ED REPLY: What a find! Way to go! 
We ha\’e long known of a defective wave 
soldering machine at the factory that 
produced hundreds, maybe thousands of 
PRO-2004's with defective solder joints, 
many of which escaped QA and even 
managed to not show up through the 
warranty period. Apparently the wave 
soldering machine drifted out of 
tolerance over a period of time, because 
some 2004’s failed during warranty; 
some right after warranty expired, and to 
this day, some are still failing. In these 
cases, a lot of resoldering gets the unit 
back up and running. 

1 have heard of defective “vias” or 
plated-thru holes, but haven 7 seen any 
myself. Apparently yours was almost 
defective, but not quite, until you poked 
that speedup diode into the hole. 
Perhaps the heat of soldering made it 
fail. Hard to tell now. I just wonder 
what would have happened had you 
resoldered that connection several years 
ago? I’m pretty sure I advised you then 
to look for bad solder joints, though this 
would not have clued you to anything 
you did or that was associated with the 
speed diode modification. So from your 
anecdote, we can resurrect an old 
technician's rule of thumb: 

If your equipment was functioning ok before 
you went into it, and has a failure mode after 
you're done, then trace 4 retrace your steps 
until the problem is found, and do not go off 
on tangents and unrelated avenues of pursuitl 

I wish I would have insisted on that 
axiom back when you and I 
corresponded, and I wish you would 

have persisted with questioning me until 
we found the problem. All’s well that 
ends well, but geez, man, you sure had to 
do without a superb scanner all these 
years. Let this be a lesson to the rest of 
us to persist until we meet success! 

From: Thomas Nichols. Indianapolis. IN 

The A/C-D/C power supply from MECI 
has a hum in it. How do we get rid of it? 
Keep up the fine work. How about a 
book or more info on the BC-3000? 

ED REPLY: Depends on what kind of 
hum ’’ we ’re talking about, mechanical 
or electrical. Mechanical hum is a 
physically generated sound, usually from 
the transformer core, while electrical 
hum is caused by an unfiltered DC or 
insufficient filtering of the DC supply 
circuit. Usually there is no cure for 
mechanical hum unless nuts & bolts can 
be tightened to quench the vibration that 
causes the hum. Electrical hum can 
usually be corrected by adding a large 
electrolytic capacitor to the (+) and (-) 
leads of the power supply as follows. 







Start with a capacitor value of 470-pF, 
and if that helps at all, but doesn't 
eliminate the hum, then try 1000-pF, 
doubting the value each time until the 
hum is gone. Usually 470-pF- 1000-pF 
will eliminate electrical hum. Electrical 
hum comes from the speaker of the 
equipment whereas mechanical hum 
comes from elsewhere, usually a poorly 
designed transformer, or a defective one 
with loose laminated plates. Time for a 
new power supply, maybe? 

j BC-3000XLT Y8 PRO-26? j 
Good thought on the BC-3000 except 
that you ’re the first person to ask about 
it. I don’t have any solid technical 
information on it, but Steve Donnell of 
the US Scanner News says it’s strikingly 
similar to the PRO-26 that we have 
covered and will continue to cover. You 
should acquire the service manual for 
the BC-3000 from Uniden Customer 
Service (317) 842-1036. If I can borrow 
it from you to make a super-clean copy. 
I’ll be glad to do a comparison and to 
account for the differences between it 
and the PRO-26 in future articles. 

The PRO-26 is also made by Uniden and 
apparently differs from the BC-3000 
only to a minor extent. Weird, because 
the retail price of the BC-3000 is $350 

whereas the PRO-26 is $100 more. For 
being about the same radio, that’s a lot 
of difference, but then maybe Uniden is 
slipping the royal shaft to Radio Shack? 
Let me borrow your service manual on it 
and we ’ll go whole hog and see what can 
be done to that puppy. 

From: Mike Kionka, Arvada. CO : It’s 
time to renew my subscription to the 
WSR. It’s a great info source, so keep it 
coming! I’ve done a lot of experimenting 
with scanners, 2-way radios, and 
computers since I last wrote to you. I 
received my ham license last October, 
and have found it’s just as much fun to 
talk, as well as listen in on my scanners! 
ED: Way to go! Just remember that you 
can’t learn anything whilst you’re 
talking. Listening is learning! © 

Since my radio and electronic horizons 
are rapidly expanding beyond scanners, I 
don’t mind if the WSR has information 
on computers and other general 
electronics, as well as the scanner info. I 
think the Super Snoop Transmitter looks 
like a fun project, and I eventually plan 
to build it! My latest project is adapting 
an S-Meter to a Motorola GM300 two 
way radio. This radio has many 

interesting features, and I’ve had a great 
time experimenting with it! 

This radio is good old “firmware” 
controlled by a Motorola 68HC11E9 
microcomputer (sorta like what’s in the 
CE-232). What’s radically different 
about this firmware radio compared to 
most firmware scanners is that this 
firmware is much more controllable. 
The radio is programmed by a standard 
IBM PC through a COM port. I can 
change and modify everything from the 
scan delay to operating freqs to the Tx 
power output without even opening the 
radio! This shows that firmware doesn’t 
always have to stop a hacker! 

ED: True, except that in scanners, the 
firmware is deliberately inaccessible. 

The service manual says the MPU’s 
operating program is stored in an 
EPROM, so I would think that a hacker 

with the right equipment and 
programming knowledge could make 
this radio do almost anything. Scanners 
are using more firmware, so hopefully 
mfgrs will make theirs somewhat 
controllable as it is in this radio, but-this 
is probably too much to ask. 

2 /im -3:03 pm- The “World Scanner Report” © 1991-96; Volume 5, No 10; Page 8 

On a different subject, the digital S- 
Meter in my PRO-2006 worked great, 
but it would flicker constantly when 
scanning. I figured the easiest way to fix 
this would be to only power the meter 
circuit when the squelch was open. To 
do this, I simply put your Carrier on 
Indicator circuit in the power line for the 
meter. It works great, and I haven’t had 
any problems! You might want to pass 
this on to the readers! 

ED: Done! I think this or similar fixes 
have been introduced in the past, but it 
remains a common complaint. 

I greatly enjoyed your Ultimate Scanner 
book, and the CE-232 looks like an 
awesome accessory, but since the family 
computer is downstairs and my scanner 
is upstairs, it wouldn’t be practical at this 
time. Oh well, maybe in a few years 
things will change! 

ED: Our dear Professor Peabody had a 
situation similar to yours, so he used an 
external speaker & volume control next 
to the computer with the wire and the 
necessary serial cable running upstairs 
to the CE-232 and the scanner! 

Another solution, of course, is to get a 
second computer, perhaps one just for 
the CE-232, and as such, can be an old 
cheapo XT or AT/clone costing as little 
as $100. You can’t give those darned 
things away anymore, but they’ll work 
just fine for the CE-232, offering total 
scanner control from a remote location 
without any sacrifice. The CE-232 

requires only MS-DOS 3.1 or higher 
with 512-k RAM (min) and a 5%”floppy 
drive. Hard drive not mandatory, but 
ideal with about 3-Mb of free space. Any 
old junk PC/compatible will do. 

From: Bill Koenn. Bakersfield. CA: 
After running my PRO-2036 (This 
would also apply to the BC-890, and 
probably the BC-8500 & BC-9000) for 
quite a while, I noticed that the cabinet 
was very warm, even though the unit 
uses a wall transformer. I found the 
source to be the IC-7, an L78M05CV - 5 
volt regulator, located beneath the 
speaker. The IC is heat sunk to the 
chassis, but still puts out a lot of heat 
There were three solutions; I could drill 
holes in the cabinet top, or I could 
remove the speaker, allowing the heat to 
escape through the speaker grill and use 
an external speaker, or, (my choice) 
remove the stock speaker bolts, replace 
with longer bolts and 'A “ long spacers, 
dropping the speaker a half inch to allow 
the warm air to flow out. It worked! 

A Carrier-On-Indicator (COI) is really 
neat, and if your scanner can control a 
tape recorder, it might also be able to 
switch an LED to indicate active 
channels. Scanners like the PRO-2036, 
BC-890, BC-8500 and BC-9000, to 
name a few, have an RCA phono jack on 
the rear panel, which is controlled by a 
front panel button, marked “AUX.” 

If you don’t want to dig into the guts of 
your scanner, to build in the usual type of 

COI, a plug-in unit has some 
advantages; it’s cheap, it’s easy, and can 
be unplugged when not wanted. 

I used a large green LED (Radio Shack 
#276-215), a 9 volt battery, stepped 
down with a 330 Ohm, 'A watt resistor 
(#271-1315), and a small box such as RS 
#270-211. You’ll need an RCA phono 
plug and a piece of lamp cord, or remove 
one end of a store-bought audio cable, for 
a nicer appearance. 

LED 276-215 Box 270-211 

Resistor 271-1315(1) Cord W/Phono plug 

ED NOTE: The battery will last three 
times longer if R = 100012 The 
brilliance will not be adversely affected! 

Install the LED with the anode (longer 
lead) connected to (+). If unsure that 
your scanner actually has a switching 
relay, check first, before you start 
assembling anything. An ohmmeter will 
show if a relay is closing, just be sure 
that you have activated the “AUX” 
control, if there is one. 

The plug-in COI can be sticky taped to 
the top of the scanner, or placed higher 
on the wall, for better visibility, or just 
left to sit on the bench. After using the 
COI for some time, I found that each 
channel has to be set with the AUX 
button, after which the COI works great. 
The relay may or may not close in the 
search mode, depending on the model 
being used. _ 

i/3t/96~ ii :08 pm- The “World Scanner Report” © 1991-96; Volume 5, No 10; Page 9 









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the trade-off of a bit of enhanced 
firmware and 1000-channels. You know 
me. I’m not a firmware fan; not at the 
expense of hardware. Firmware is 
software. Software solutions to hardware 
problems are a gross misapplication of 
technology. The heck of it is that you ’re 
not going to do much better with any 
scanner in the foreseeable future. The 
mfgrs of scanners have seen the profits 
in a “cute” case with lots of cheap 
firmware features. They’re not going to 
change. This is why I see such great 
value in the PRO-2004, PRO-2005, 
PRO-2006 and PRO-43 for a long time 
to come still1 

2/V96-3 : t4 pm -The “World Scanner Report” © 1991-96; Volume 5, No 10; Page 10 

PRO-2035 & PRO-2042 

Sometimes I like to listen to my PRO-34 
where it’s dark; I memorized the tiny 
buttons but I found a SEARCH button 
for 800 MHz & up. I learned you don’t 
have to hit the ^ or 4* buttons to get it 
to continue searching; all you have to do 
is wrap your hand around the whip and it 
moves on. 

switch, easy and neat. I’m sure you will 
have a comparison of the 2035 and the 
2042. They look the same outside and 
my guess is just-. "a different 
microprocessor. Best Wishes 
PS. I built the Super-Snoop and found 
it’s cheaper to buy mini amp 277-1008c 
than build that amp and meter. Keep, 
throw away, or use the photos I sent. 

ED REPLY: Good tip on the PRO-34 
quick-resume technique. Apparently 
your hand absorbs enough signal to drop 
it below Squelch Break level. 

The PRO-2035 certainly can be 
interfaced to the CE-232 for 1-way 
Keyboard control & AutoProgramming, 
but what I want to know is why don'tyou 
connect it to that PRO-20041see in your 
photo! You 'll get 2-way control & data 
acquisition with the PRO-2004. 

I don’t see the 2035 as a "dog” at all, 
but it did get some hardware cutbacks at 

The Feb-96 issue of “Monitoring Times" 
features a detailed article by Steve Donnell 
on how to extract cellular reception from the 
PRO-2035/2042 scanners. Bear in mind that 
cellular reception by conventional means 
remains impossible on these scanners, but 
Donnell found a hack to :”trick” the PLL into 
tuning cellular on the 128.5-140.5 MHz band 
segment. Here’s how for you experienced 
hackers who don’t need much to go on. 
Details in next issue for the rest of you. 

I have, for the most part, completed the 
CE-232 interface. I’m still looking for a 
2005/6 to install it in. If worse comes to 
worse I’m still thinking about using that 
PRO-2035 to interface. Is the 2035 such 
a dog; should I trade it, sell it, or what? 
All I did so far is the improved tape rec 

From: William Shaft. Tinlev Park. IL 
I have only started learning my computer 
since April of this year and figure it will 
take another six months to get it down 
pat, again, patience is the key word. 

+ Time to Renew Your Subscription? ~ 

+ Editorial: Future Directions of Scanners, Scanning, & the WSR 
+ The Ideal Scanner? A list of attributes ~ “Big Brother's Big Ears” 

+ Data/Tone Squelch MOD-44 Upgraded by Prof. Peabody 
+ Cobra 2000 GTL Receiver Tricks ~ Cellular for non-cellular scanners? 

+ Homebrew Computer Notes ~ PRO-2004 Problem Solving. 

+ Solutions for Power Supply Hum ~ BC-3000XLT vs PRO-26 Notes 
+ Controlling Firmware? No..... - Flickering LED S-Meter Fix 
| + CE-232 Possibilities - Quick Fix for a warm PRO-2036 
| + Plug-ln Canier On-Indicator ~ Cellular Mod for PRO-2035 A PRO-2042 

** COMMtronics Engineering 

ite/” “World Scanner Report” 

P0 Box 262478 ess/onal 

San Diego, CA 92196-2478 efwces