Publisher/Editor; N. S. Cheek, Sr, aka *8r. Rigoraortis* : V1N3: Harch , 1991
THE WORLD SCANNER REPORT
A Journal of VHF-UHF Scanner Technology i Engineering
Published at: CQHHtronics Engineering; PO BOX 262478; San Diego, CA 92196 Copyright (c) 1991 (All Rights Reserved) $4.90
SCANNER MODIFICATION HANDBOOK CORNER
HDD-16 UPDftTEs 6,499 Channels For The PRO-2004/5/6
Despite ay otter to help with problems , there have been relatively
tew requests associated with any of the Hods in Vol-1 of ay book.
Perhaps the single greatest trouble spot, and it isn't great in
the strictest sense of the word, is HOD-16, the 6,400 Channel
Extended Heaory for the PRO-2904/5/6. I worked on a couple of
scanners that had MOD-16 problems and offered helpful suggestions
to a handful more. In all cases, the trouble with HOD-16 was
easily remedied: one or more errors in the wiring and connection
of the 28 necessary wires.
Face it, when 23 wires sust solder into a space of only a couple
of square inches, there is an excellent opportunity to literally
get your wires crossed. And, one crossed pair of wires means TNO
mistakes ! This type of mistake results in unpredictable, erratic
operation, depending on which wires get crossed. In no event,
however, has any serious harm been caused, though I have known the
SRAH chip to blow out in a couple of cases because of errors in
the wiring. Correct any wiring errors and start with a known good
SRAH chip and 6,400-channel operation will be letter perfect! If
you have put off adding 6,000 more channels to your PRO-2004/5/6
for fear of making a serious mistake, relax! The instructions for
HOD-16 in Voi-1 of ay SCANNER HQDIFICATION HANDBOOK are accurate
and detailed. If you will patiently follow the instructions, step
by step, you'll be successful.
If you are following the directions in Vol-1 of ay SCANNER
HQDIFICATION HANDBOOK , be sure to change the resistors, R1-R4,
froa 1-k (or 4.7-k) to 47-k. Better still, wait for Vol-2 of the
SCANNER HQDIFICATION HANDBOOK to coae out next aonth where there
will be featured a Keyboard Heaory Block Controller (KHBC) for
HQD-16, very siailar to this aonth's Keyboard Extended Function
Switch. In fact, the KHBC (HOD-28), eliminates the need for any
external switches to control the 16 Blocks of 400 channels ea.
You siaply press two Keyboard keys and the rest is autoaatic. No
external switches required!!!
»»> Vol-2, SCANNER HQDIFICATION HANDBOOK IS CQHIN6I ««<
CRB Research Books has informal ly announced that Voluae 2 of ay
SCANNER HQDIFICATION HANDBOOK will be available in early April,
1991. It will be sold at sail order dealers around the country,
directly froa the publisher, or best still, and froa nowhere else,
you can get a personally autographed copy directly froa me. Orders
now being accepted for either Vol-1 or Vol-2 at $17.95 ea, plus
$3.09 (USA) first class shipping; $4.00 Canada or $5.00, other
foreign. Allow extra for foreign Air Hail. All ay books
purchased froa me will be autographed and will contain a notice
(if necessary) of any pertinent errors or problems to be pen & ink
corrected. NOTE: Vol-2 is not expected to be shipped before
early-aid April, but your advance order with payaent will receive
priority attention; first coae, first served, when available. It
is probable, since I aa the author, that I'll have Vol-2 ready for
shipment before other dealers around the country. You can use the
Sub Order Blank on Page 7 to order ay books.
Please don t confuse Vol-2 with Vol-1. Ruaors are circulating how
Voi-2 is only an aaended version of Vol-1. Ha ha! No way! Vol-2
takes up where Vol-1 leaves off. Short of a brief review of Vol-1
with error corrections and new ways of doing old things, Vol-2
takes off into uncharted territory with new aods, new hints and
new tricks. If you're a Hacker, you'll need both.
This corner of 'THE NORLD SCANNER REPORT ' will keep both volumes
of ay books updated, so stay tuned here! Next aonth, or after
Vol-2 has been released, I'll present a review of it for your
< < < < * > > > >
Public Hessage (RECEIVED;
Message I 5598 * SHORT-NAVE/SCANNER *
To : All
Froa : Ken Hoehn
Subject : AQR scanners froa ACE
Date : 91/02/17, 01:44:80
Beware of purchasing AQR scanners froa ACE loss, of Indianapolis,
IN. I have gone through literal hell getting a probiea resolved
there. They take the $, and get to the probiea when and IF they
feel like it. In research, I find that the AOR-ACE relationship
is not so rosy either, but ACE has the US aarket locked up.
If you buy it, good luck. If you need it fixed (and several have
coae to us with initial failures. .. .better luck. Try sending it
to your local high school electronics class. ...the repair will
likely be better! — == Ken ==—
— TASHAIL v2. 38
* Origin: The «< Air Studio ») BBS 313-546-7045 (1:120/216)
EDITOR'S NOTE: The above aessage was taken fro i the Shortmave &
Scanner Echo of the International FidoNet f a uorld&ide public
coaputer network in » hich I participates It is reproduced for you
here as a follow up to last aonth's article on the AR-3000 by
a Professor Peabody” . This aessage should not be construed as the
final say-so about AOR scanners or ACE Coaaunications, but it does
represent one person's opinion . I will reproduce i ore Material ,
pro and con, on various subjects froa the FidoNet occasional! y.
A BRIEF ON CQHPUTER BULLETIN BOARDS
Coaputer BBS's, the FidoNet and radio are discussed at greater
length in ay coming Vol-2 of the SCANNER MODIFICATION HANDBOOK ,
but if you have a computer with a aodea, you're all set for sose
direct communications with me now if you like. I am available to
you on three computer bulletin boards in the San Diego area. You
can leave me either a private E-Hail or a public message as you
see fit, and I will usually answer within 24 hours on the first
two BBS's. I check into the third one listed about once a week.
All three have great Scanner Conferences in which I participate.
If you call, follow the simple log-on directions and we'll chat!
The 1st & last are 24-hr/day BBS's; the 2nd is off from 8pa-12pa,
Pacific Time. (619) 560-7659; (619) 273-6339; (619) 275-6129
HI-TECH EXTRA FUNCTION SWITCHES FOR YOUR PRO-2004/5/6
AND MAYBE OTHER SCANNERS, TOO!
Have you ever flipped a wall light switch in your home only to
wish that it would control not only the lights, but also a TV,
maybe flush the toilet, start the dishwasher, open the garage door
and shut off the kids' stereo system? You know, one switch to do
many different things? Mental telepathy might do it if you're
capable, but for the unadept, a few cheap chips and a handful of
junkbcx parts can be wired together to make the Keyboard of your
scanner do lots more than just what the manufacturer intended!
Gk, let me explain..... See, your scanner's keyboard has anywhere
from 15 to 29 push-button switches on it, each one controlling a
different function. Fine 'n dandy until you do some modifications
and extra functions which require external control. A conventional
method for any necessary extra switching is to drill some holes
and install toggle switches of one sort or another. I prefer the
newfangled DIP switches, but they're hard to install and a mess of
things can be made if you're not careful. Toggle switches are
easy to install, but may the Cosmos help you if the drill bit
suddenly breaks through the chassis and runs amok inside the
scanner before you have the presence of mind to shut it off.
Retrofitted toggle switches seem to never match up with the design
scheme of the scanner's face plate, or you have to install them in
the rear panel out of sight (and mind) and are most difficult to
reach for casual control of things. Eureka! I haye developed a
super slick method of controlling various modifications and extra
functions, and absolutely no external switches of any kind are
required! Ne'll just use the scanner's Keyboard in such a manner
that won't disrupt normal scanner functions and which will still
allow you to turn things on and off at will. The secret is the
use of TWO KEYS simultaneously!
There is at least one or two keys on most scanners that, when
pressed, do absolutely nothing under normal conditions. One of
these keys is the CLEAR key and another is the ENTER key. For
example, turn your scanner ON and immediately press either CLEAR
or ENTER. Nothing out of the ordinary happens, right? If so, the
rest of this article is for YOU, because we can use the CLEAR
and/or ENTER keys in conjunction with certain other keys to
generate a switching sequence for controlling add-ons such as an
Automatic Tape Recorder Switch; Extended Delay Function, Data
Squelch, 6,438 Channels of Extended Memory, or most anything else
that requires an external switch of some sort or another!
The interesting thing about the CLEAR and ENTER keys is that not
only do they do nothing when pressed under normal circumstances,
but they also tell the CPU to ignore any other key if pressed at
the same time! So try this to see what I mean: first press and
hold the CLEAR key followed by the PROGRAM key (or any other key).
Nothing happens! Wonderful, because we will sake use of a dual
keypress in a simple logic circuit to operate an electronic switch
which is good enough for many switching requirements! You won't
have to drill any holes or deface the scanner at all unless you'd
like some neat looking LEDs to indicate what switch functions are
on or off. In that case, you'll have to drill some t / 9 * holes for
T-l sized LEDs, but this is not necessary if you're not turned on
by drilling holes. You'll just have to remember what has been
switched on or off which shouldn't be all that difficult.
Otherwise, install LEDs as shown herein for a super sporty and
great looking effect!
The Keyboard Extended Function Switch features four unique and
separate electronic switches that can control most low current
functions typical of cy scanner modifications. You will operate
these switch functions by merely pressing the scanner's CLEAR key
and one other key at the same time. Press both for ON; press both
again for OFF. How much simpler or more aesthetic can it be?
THE KEYBOARD EXTENDED FUNCTION SWITCH (KEFS)
The heart and soul of the KEFS is the 4066 “bilateral 9 (two-way)
electronic switch chip which comes in a standard 14-pin DIP
package. Nothing unusual about the wiring and layout of this neat
chip except that it contains the equivalent of four SPST toggle
switches. Four of the 4066 s pins are for control of the
switches; eight pins for the actual switches; and then there's a
ground pin and a power supply pin for a total of 14 pins.
The logic of my KEFS consists of a Quad Dual Input AND chip,
(74HC88) which feeds two Dual Type D Flip-Flops, (4013). Each
segment of the AND chip required two inputs to generate one
output. This creates the dual keypress logic. My KEFS ignores
normal scanner keypresses and the scanner ignores the KEFS dual
keypresses!. Each output of the AND chip triggers a corresponding
Flip-Flop to trigger the pertinent switch segment of the 4066
chip. The design is such that when you first turn on your
scanner, all switch segments are OFF. This ensures that your
scanner fires up normally as the manufacturer intended. You can
then select whichever of the four switch combinations you desire
to perform intended functions. The circuit is simple enough, and
even if you don't know a thing about digital electronics, you can
still achieve success if you follow ay steps and diagrams here.
If, for any reason, you do not wish to perform this project
yourself, anyone with amateur technical ability can do it for you.
I will offer the Keyboard Extended Function Switch as MOD-47 of my
standard modification services. The KEFS will also be available
as a preassembled and tested circuit board, ready for you, me or
someone else to install. Since this modification is so new,
prices and availability are not yet certain, but you can contact
me for details which should be available soon. Now let's build
the Keyboard Extended Function Switch to control whatever in your
scanner needs to be controlled. Refer to the Parts List, the
diagrams and pictorials, and the steps of procedure on the
following pages. Nothing is terribly critical, but work carefully
and don't deviate from the Parts List.
THE KflSLS SCANNER REPORT B (c) 1991
H1N 3 - Page 2
PARTS LIST FOR THE KEYBOARD EXTENDED FUNCTION SWITCH
IC; 74HC88 or 74C08; Dual Input Quad AND
IC; 4813; Dual Type D Flip-Flop
IC; 4066; Quad Bilateral Switch
IC DIP sockets; 14-pin
0.47-uF/35vdc capacitor; tantalus
2.2-uF/35vdc capacitor; tantalum
T-l sized LEDs; your choice of color
Hookup wire; assorted color codes
Solid copper wire; 18-ga; small quantity
Solid copper wire; 24-ga; board wiring
Heat Shrink Tubing; for neat wire bundling 278-1627
1. Build the KEFS on a piece of "perf board 3 measuring about
l 1 / 2 n x 2 l / 4 \ Use the general layout as shown.
2. Solder to 14-pin DIP IC sockets and plug the chips in only
after the KEFS board is completed and inspected for errors.
3. Begin by wiring together the Pin 7's of all four chips. This
will be KEFS ground. Also ground pins 4 and 10 of U-2 and
U-3, the 4813 's.
4. Hire together the Pin 14 's of all four chips. This will be
the +5v power supply buss.
5. Next install and solder in place all capacitors, followed by
the resistors. You can eliminate resistors R9-R12 if you
don't want external LED indicators. Otherwise, install R9-R12
on end with a free end of each pointing up fro# the KEFS
circuit board. He'll put wires to these 4 resistors later for
the LED assembly that will be installed in the front panel.
6. You will probably have to use "jumper n wires to cross other
wires on your KEFS circuit board. Try to use both sides of
the board for jumpering as shown in the photos to minimize the
use of messy insulated wiring on the board. Fully complete
the KEFS board at this tise before proceeding further.
7. Set up a color coded wiring scheme for the Keyboard Switch
Control; LEDs; Switch Input/Output; +5v power and ground wires
so that you can tell the difference among them later. Each of
the wires should be about 6“-10 n in length for starters. You
can trim them to length later. A great source of color coded
hookup wires is Radio Shack's #273-776. Strip the outer
insulation k shield k salvage the wires for hookups!
A. Solder a color coded pair of wires to U-l, Pins 1 k 2. Solder
a similar, but different color coded pair of wires to li-4,
Pins 1 k 2. Solder a similar color coded wire to the free end
of R-9. These wires are associated with "Switch A a .
B. Solder a color coded pair of wires to U-l, Pins 4 k 5. Solder
a similar, but different color coded pair of wires to U-4,
Pins 3 k 4. Solder a similar color coded wire to the free end
of R-10. These wires are associated with "Switch B\
C. Solder a color coded pair of wires to U-l, Pins 9 k 10.
Solder a similar, but different color coded pair of wires to
U-4, Pins 8 & 9. Solder a similar color coded wire to the
free end of R-ll. These wires are associated with "Switch C a .
D. Solder a color coded pair of wires to U-l, Pins 12 k 13.
Solder a similar, but different color coded pair of wires to
U-4, Pins 18 k 11. Solder a similar color coded wire to the
free end of R-12. These wires are associated with "Switch D".
E. Solder a color coded wire to the +5v power buss that connects
the Pins 114 of all four chips on the KEFS board..
F. Solder two color coded wires to the ground buss that connects
the Pins #7 of all four chips.
S. Route one of the ground wires connected in Step 7.F along with
the four wires that were connected to R9-R12 in Steps 7. A -
7.D above. Make a bundle of these five wires for routing to
the LED assembly later. Skip this step and one of the two
ground wires if you do not want the LED Indicator.
H. Depending on HQH you want to install the KEFS in your scanner,
solder a stiff, bare copper wire (18-ga) about 3" long to the
ground buss that connects the Pins #7 of all four chips. This
stiff copper wire can later be soldered to the scanner's inner
metal chassis or to a PCB ground trace for a nice, shock-free
installation that will permit easy removal at any time needed.
Otherwise, you can mount the KEFS board using machine nuts,
bolts and standoffs as desired.
DO ROT INSTALL THE REFS IR THE SC AMIES AT THIS T IKE!
I. Bundle together the Keyboard Control wires that were soldered
to U-l in Steps 7. A - 7.D above. Strip I / 4 “ of insulation
from the ends of each of the eight wires and twist together
the bare ends of each wire pair. (Keep each pair separate!)
Solder a 10,800-ohm (18-k) resistor to each of the wire pair
junctions. Solder together the free ends of the four
resistors into a common junction. Then solder this common
resistor junction to a ground on the KEFS board. NOTE: This
Step is temporary for testing and later the resistors will be
removed and the wire pairs will be separated.
J. Bundle together the 4866 Switch In-Out wire pairs that were
soldered to U-4 in Steps 7. A - 7.D above. Strip 1 / 4 " of
insulation from the ends of each wire pair and leave the bare
ends close together but not touching.
7 RE UORLD SCARRER REPORT 0 ( c ) 1991
V1R3 - Page 3
K, It an LED Indicator is desired, then select tour T-l sized
LEDs of your color choice (orange, green, yellow & red?) and
temporarily solder all the cathodes together, and solder that
common cathode junction to one of the ground wires connected
in Step 7.F above. Then solder the wire from R-9 to the anode
of LED "A\ Solder the wire from R-10 to the anode of LED H 8 n .
Solder the wire from R-ii to the anode of LED B C a . Solder the
wire from R-12 to the anode of LED “D".
TESTIN6 YOUR KEFS BOARD
The KEFS board should NOT be installed in your scanner at this
time. Be will test it for proper operation prior to installation.
8. You should have a 5-voit DC power supply for testing the KEFS
board, but if none is available, you can use the one in your
scanner. See below. You could also rig three flashlight
batteries in series for 4.5 volts which ought to work fine.
First connect the ground buss of the KEFS (Steps 7.F or 7.H)
to the (-) terminal of the 5-v power supply. Then connect
the KEFS +5v power lead (Step 7.E) to the (+) terminal of the
5-volt power supply.
NOTE: If you're using the scanner's power supply, BE SURE THE
SCANNER IS TURNED OFF. Position the KEFS board near, but not
in the scanner, and then connect the KEFS ground buss to the
scanner's metal chassis somewhere. An alligator clip lead
will do nicely. Then connect the KEFS +5v power lead to the
OUTPUT lug of IC-8 in your PRO-2884/5/6. A temporary solder
connection will be better than an alligator clip lead here to
prevent accidental shorts h. embarrassing smoke.
9. Connect a handy length of hookup wire to the (+) terminal of
the power supply. If you're using the scanner's power supply,
then connect this wire to the same point as the KEFS +5v power
lead in Step 8. Then solder a 1, 038-ohm resistor (1-ki to the
free end of this wire. NOTE: This is a temporary step for
test purposes only. This 1-k resistor and wire will not be
13. If you have a mi Hi ammeter available, connect it in series
with the (+) power supply lead to determine current flow. If
you don’t have a milliasmeter, don't worry. Turn the +5v Test
Power Supply On (or the scanner, as appropriate). Be real
nervous at this point while you check for smoke or other weird
effects in case something went wrong. The LEDs should be OFF.
If you have a milliammeter connected for current measurement,
check to see that current drain is less than one milliamp.
Anything more than 1 to 5-ma indicates a problem. Actually,
if all is well, the milliammeter should indicate virtually
zero after a few seconds have lapsed. If something appears to
be wrong at this point, shut off the power and troubleshoot
your KEFS Board. If all appears ok, then proceed below.
11. Assuming that all appears ok at this point; i.e., minimal
current drain and no LEDs lit up, momentarily touch the 1-k
resistor connected in Step 9 to Pin 1 or 2 of U-l on the KEFS
Board. LED n A a will light up! It might momentarily light or
flicker and then go off. This is due to the “noise" caused by
touching the 1-k resistor to U-l 's pins. Not to worry.
Practice this a little, and you'll see where a quick, firm,
momentary touch of the 1-k resistor to Pin 1 or 2 of U-l will
turn on LED "A”. Now touch the 1-k resistor again to Pin 1 or
2 and LED “A" will extinguish. This simulates a push-on, push
off action which will be done by the Keyboard buttons later I
If ail is well, at this point, touch the 1-k resistor to Pin 4
or 5 of U-l and note that LED "B“ can be controlled similar to
the first. Repeat this test procedure for Pin 9 or 18 and
again for Pin 12 or 13 to test the action of LEDs "C“ St "D“.
Now, turn the power supply or scanner OFF; wait a minute or
so, and then turn it back on again. All LEDs should be
extinguished. Proceed below.
12. If you did not opt for the LED Indicator, or if you
successfully performed Step 11, then do this Step now.
Connect an ohmaeter or other continuity tester to the wire
pair at U-4, Pins 1 & 2. Repeat the procedures in Step 11,
except watch the ohmseter which should indicate an open
circuit (infinity ohms). Now touch the 1-k resistor to Pin 1
or 2 of U-l, and note that the continuity tester will show a
path, just like a switch was closed! If using an ohmaeter,
the resistance will be between 188-380 ohms. This is normal.
Now again touch the 1-k resistor to Pin 1 or 2 of U-l and see
that the continuity tester or ohmaeter again reads an open
circuit. If all is well, at this point, connect the ohmaeter
to the wire pair at U-4, Pins 3 St 4. Touch the l-k resistor
to Pin 4 or 5 of U-l and note that the ohmaeter can be
controlled similar to the first. Repeat this test procedure
for U-l, Pin 9 or 18 and again for Pin 12 or 13 to test the
action of the 3rd and 4th Switch Segments, U-4, Pins 8 St 9 and
Pins 10 St 11. Just like in Step 11, this simulates a push-on,
push off action which will be done by the Keyboard buttons
later! This step tests the action of the 4866 switch, so if
all is well at this point, you're done and ready to install
the KEFS board in your scanner.
13. Remove the temporary 18-k resistors from the ends of the wire
pairs that go to U-l (Step 7.1). Separate the twisted ends of
the wire pairs and clip off all but about l / 8 a of exposed
wire. Tin with solder the exposed end of each of the eight
wires. Remove and discard the 1-k resistor and temporary
hookup wire (Step 9).
INSTALLATION OF THE KEFS IN YOUR SCANNER
It is impossible to cover precise installation procedures for ail
scanners but the following steps will cover the Realistic
PRO-2884, 2085 and 2336. With some variance here and there, many
other Realistic scanners can be readily adapted to accept the
Keyboard Extended Function Switch. Chances are that any scanner
with adequate space to hold the KEFS and which has a matrix type
of keyboard with at least a CLEAR and/or ENTER key can also accept
the KEFS. The following procedures are specifically for the
PRO-2084/5/6 and will be followed up with general suggestions for
14. Find a suitable mounting location for the KEFS board in your
scanner. Wire length is not critical, so anywhere there is
THE HORLB SCANNER REPORT ” (c) 1991
K1K3 - Page 4
room will be ok. Just keep in mind that you say be making
numerous modifications to your scanner in the coming months,
so don t squander what little “real estate 9 is available.
Make your installation neat and conservative. Connect the
KEFS ground buss (or stiff copper wire) to a scanner ground,
either the metal chassis or a printed circuit board ground
trace. Mount the KEFS in the scanner now.
15. Connect the +5v power lead of the KEFS (Step 7.E) to the
scanner's +5v power supply. This is the OUTPUT lug of IC-8.
16. If necessary, remake the LED Indicator Assembly (Step 7.K) so
that it conforms to a nice appearing arrangement for the front
panel of your scanner. If you don't know how to go about this
aspect of the installation, please wait for my forthcoming
SCANNER MODIFICATION HANDBOOK, Vol-2 which shows in great
detail how to install T-l LEDs in the faceplate of the
PRO-2804/5/6 and other scanners. Otherwise, install the LED
assembly in the face plate of your scanner at this time. It
may be convenient to temporarily remove the wiring from the
LED Assembly to facilitate installation. Reconnect the wires
per Step 7.K. after the LED Assembly has been installed.
17. Group and bundle together the four wire pairs (Switched wires)
from U-4. These wires will serve as the switch connections
for any modifications or controls that you wish to incorporate
into the KEFS. Position this wire bundle out of the way for
now. Tape off the ends of any pair you won't be using. They
will always be available for future needs!
IS. Group and bundle together the four wire pairs (Keyboard
Control) from U-l. Identify the individual wires that go to
U-l, Pins 1, 4, and 9. Twist together and solder the stripped
ends of these three wires. Strip the ends and prepare the
remaining five wires as follows: twist together and tin with
solder the ends of the two wires that go to U-l, Pins 2 and
13. Also twist together and solder the ends of the two wires
that go to U-l, Pins 5 and 12. Leave free the remaining wire
that goes to U-l, Pin 18.
19. PRQ-2004 - Only: Turn the scanner upside down so that you can
see the inside area just behind the Keyboard. Locate the 13
solder pads in a vertical line along the right edge of the
Keyboard circuit board. The closest spot is Pad 13. The
deepest, most difficult to get to is Pad 1.
A. Solder the wire from U-l, Pin 18 (Step 18) to Keyboard Pad 9.
This is the numeral n 3 a key pad.
B. Solder the two wires from U-l, Pins 2 It 13 (Step 13) to
Keyboard Pad 18. This is the PROGRAM key pad.
C. Solder the two wires from U-l, Pins 5 St 12 (Step 18) to
Keyboard Pad 11. This is the ENTER key pad.
D. Solder the three KEFS wires from U-l, Pins 1, 4 St 9 (Step 18)
to Pad 12 of the Keyboard. This is the CLEAR key control pad.
28. PRQ-2005/6 - Only: Facing the front of the scanner with the
top cover removed, look immediately behind the number 1, 2 St 3
keys inside the front panel where you'll see a white connector
strip, CN-501. Looking down from the top, the closest pin of
CN-501 to the metal side chassis is Keyboard Pin 1. The
opposite end pin of CN-501 is Pin 13. Cut four pieces of
stiff, bare copper wire, 18-22 ga, about 1 / 2 U to s / 8 “ long.
Insert one of these short copper stubs into Keyboard Pin 12.
Grip this wire stub with a forceps or needlenose pliers and
work it gently but firmly into Keyboard Pin 12 until it seats.
It might help to first practice with a sewing needle or a pin
until you can see how an insertion can be made. Then, insert
the remaining three stiff copper wires into Keyboard Pins 11,
10 and 9 respectively. When properly inserted, these four
short copper stubs will be firmly seated and cannot “fall out 9
without a definite pulling force.
A. Solder the three KEFS wires from U-l, Pins 1,4 Sc 9 (Step 18)
to the stub in Keyboard Pin 12. This is the CLEAR key control
B. Solder the two wires from U-l, Pins 5 St 12 (Step 18) to the
stub in Keyboard Pin 11. This is the ENTER key pin.
C. Solder the two wires from U-l, Pins 2 St 13 (Step 18) to the
stub in Keyboard Pin 10. This is the PROGRAM key pin.
D. Solder the wire from U-l, Pin 18 (Step 18) to the stub in
Keyboard Pin 9. This is the numeral "3“ key pad.
That's it; your KEFS is fully installed and operational.
HINTS FOR INSTALLATION OF THE KEFS IN OTHER SCANNERS
You'll have to study the Keyboard Switch Matrix in the Service
Manual for your scanner. If your scanner has, say fifteen keys,
they might be electrically arranged in a matrix cf 3 x 5, that is
three rows by five columns. The probable connection points for
the KEFS will likely be to the narrowest dimension of the matrix.
Therefore, if yours is a 3 x 5 matrix, you'll only be able to get
two switch functions from dual keypresses. There are only two
combinations of two switches in a 3-row matrix. So you'll not be
able to use all four switch segments of the KEFS if this is so.
The PRO-2804/5/6 have a 4 x 8 matrix so there are a total of six
possible pairs of switching in a four row matrix. In general, do
not attempt to connect your KEFS to the widest dimension, thinking
that there will be more combinations; there will not! The columns
or widest dimension of a Keyboard Switch Matrix usually have a
full-time 5-volts; the rows or narrowest dimension is almost
always 3-volts until contacted by the columns. This is the logic
basis of the KEFS, you see. The inputs of U-l must always be
"Low 9 or 8-volts except when a keyboard pair is pressed. So, in
the final analysis, you may have to test your Keyboard Matrix with
a voltmeter to determine which rows/columns are “Low" and which
are "High”. The KEFS must be connected to "Low" keys. One other
thing: your scanner must have a 5-volt power supply or else my
KEFS will not work. Most scanners nowadays do, so this should not
be a problem. If in doubt, I will be glad to offer suggestions and
a professional opinion on the suitability of my KEFS with your
scanner. You MUST, however, enclose a SASE and one loose extra
stamp with your request. Also, send me a copy of the Service
Manual for your scanner or the schematic diagram, if I don't
already have one. I do have manuals for most current Realistic
THE HORLD SCAHHER REPORT" (c) 1991
- Page 5
scanners and the BC-768/953, BC-238/205 and a tew others. I can't
help you here without benefit of a diagram or a Service Manual.
Besides all that, you can t help vourself without the diagram and
Manual, so you better have 'em regardless of whether or not you
need my help!
LIMITATIONS QF THE KEYBOARD EXTENDED FUNCTION SWITCH
The KEFS is capable of turning on or off most low current
circuits, and switching in or out virtually all low-level signal
paths. There is an inherent resistance of around 258-ohms in each
segment of the 4866 Bilateral Switch chip, so this limits the
amount of current that can flow through the 4866 without burning
it up. This limit appears to be about 28-ma; possibly 25-ms. The
4866 is cheap, though, so if you burn one out, just replace it.
You can parallel switch segments for increased current handling if
necessary, but there is a better method that I will show you next
month. It involves a simple circuit of one transistor and one
resistor to allow current drains of 108-ma or more.
Another limitation of the KEFS as presented this month is that the
4366 Bilateral Switch cannot switch voltages higher than the power
supply voltage or else it will burn out. While the 4866 can be
powered by up to 12 volts, my KEFS is powered by 5 volts, so you
can't use it to directly switch 12-volt circuits. Relax, because
the add-on circuit I'll show you next month will not only handle
higher currents but also voltages to as high as 25 volts or so
which is well beyond anything you'll encounter in your scanner.
Most of our switching needs are for 5-volts, which makes the KEFS
eminently suitable for most applications and next month. I'll show
you how to adapt one or more switch segments for higher voltage or
As depicted and designed here, the KEFS is not well suited for
switching RF signals. RF is susceptible to degradation by lengthy
wire runs, so don't attempt to use it as a "Crystal Switch", a
better approach for which is discussed in "Professor Peabody’s"
article this month. The 4066 Bilateral Switch chip can handle RF,
but it must be laid out differently than in the KEFS, which was
designed to switch DC power, digital and audio signals only.
HOW TO SWITCH CPU CLOCK CRYSTALS by "Professor Peabody"
By now many of you hackers have changed the CPU Clock resonators
to increase the SCAN k SEARCH speed of your scanners. Typical is
38-cps for the PRO-2884/5 and 45-cps for the PRO-2096. The PRO-34
can be cranked up to maybe 28-25-cps, and the BC-288XLT speed can
be doubled at least. This is a great mod but it has one liability:
shortened DELAY time. But it is possible to gang your Clock
crystals on a switch so you can select original speed and delay;
faster speed but shorter delay, and/or you can always put in a
lower freq crystal than stock if you wish. One example of why
you'd want a slower mode sometimes is the military aircraft band,
225-488 MHz. NFM is the default mode for this band in the
PRO-2884/5/6. But AM is the most commonly used mode here. So if
you program 100 military aircraft freqs, you have to change modes
198 times, with lots of chances for error. Don't forget, DELAY
has to be programmed too. Instead of "boinkinq" the manual button
188 times to check programming, just put the slowest speed into
operaton and watch the display. Any errors can be quickly found
and corrected. Plus, wear on the keyboard and your finger are
reduced. A 5 MH: crystal will create a longer DELAY than the
stock 7.37 MHz crystal. But speed will be lowered to 13 CPS in
the PRO-2904/5. But no matter how you want to tailor the speed,
the big word here is versatility! Choose the soeed for the mode
you select. Crystal switching can be easy; all you need is a 3PDT
switch such as Radio Shack's sicroaini toggle, catalog 1275-625;
wired as shown. _ ^
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On* caution if you use the stock resonator: DO NOT SOLDER the
center pin back to ground. Leave it open and just use the two
outside pins. Otherwise the resonator will override the other
crystal. The switch should be mounted any place convenient on the
front panel. The best place for a toggle switch in the PRO-2985/6
is along the vertical groove that separates the Keyboard from the
LCD Display area. There is a problem with the PRO-2084 since the
Clock resonator is not physically near the front panel like in the
PRO-2805/6. i*le have to keep the wires as short as possible
because of the RF generated by crstals. A coming article will
present a "diode" switch that will be suitable for any scanner,
regardless of where the Clock crystal is located. For now, and
for the PRO- 2885/6, be sure to insulate the crystal body with tape
to protect it from shorting out something on the CPU board.
KEYBOARD EXTENDED FUNCTION SNITCH PICTORIALS
THE NORLD SCANNER REPORT ' (c) 1991
UN 3 - Page 6
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"THE WORLD SCANNER REPORT" (c) 1991
©-If? I FEB 18 139)
WORLD SCANNER REPORT
PO BOX '262478
SAN DIEGO, CALIFORNIA 92196-2478
1/1 N3 - Page 7
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List the make k model of your scanners and other radio equipment:
Single copy, per issue $4.00 $4 surf/$5 Air
1991 (6 sas,Jan-June) $15.00 $17 surf/$22 Air
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Other Available Literature
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Use the below space to tell us anything else you want!
List the make k model of any computer equipment you own/operate:
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need other intonation or a personal reply/
KfcVO^Afl) fOtJersQfJ Suj'TCrf UJ/A/UG- 7>A?-//-/P7
"THE WORLD SCANNER REPORT" (c) 1991 VI N3 - Page 8
WORLD SCANNER REPORT
PO BOX 262478
SAN DIEGO, CA 92196-2478
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