colt 485 Black Shadow User manual

VOLUME 3
PUBLISHED AUGUST 197S
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BY ROD JOHNSON ©COPYRIGHT 1978
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CONFIDENTIAL
FACTUAL
SCHEMATICS ETC
U DATED QUARTERiT
PRICE $1M5

NEW PRODUCT RELEASE
Colt 485 Black Sha ow
The Finest Mobile AM/SSB Period. State-of-the-art engi 
neering for the biggest "talk-punch" in mobile CB Colt's ex 
clusive crystal filter reduces channel bleedover.
LED Digital Channel Readout • Squelch Control • Built-in
Automatic Noise Limiter • RF Noise Blanker • Variable RF
am Control • Clarifier Control • S/RF Meter • External
Speaker Jack • Deluxe Microphone • Public Address Control
• Mounting Bracket
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IMPORTANT: READ THIS FIRST
The information in this book is not to be used to
exceed F C C specifications, in any case, as applied
to power, modulation, frequency spectrum, etc It is
illegal to do this to any CLASS D RADIO
This book is a factual report of gathered information,
and as such is intended for use on radios for EXPORT ONLY
If you are not familiar with electronics, it is better
to check far advise with your local electronics or CB
center, as to restrictions, etc , concerning your radio
More information, on other units will be forthcoming
in future issues, to be published on a quarterly basis
This book will not be found at a book store, but can be
obtained through your local CB store or distributor, or
by sending $12 95 to:
Secret CB
P O Box 8189
Corpus Christi, Texas 78412
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TABLE OF CONTENTS
INTRODUCTION ................................................................................... age 3
INFORMATION ON COLT .............................................................. ages4 13
MASTER CO Y B ...................................................................................... age 14
MASTER CO YC ...................................................................................... age 15
S ECIFIC RADIO MODIFICATIONS .......................................... ages 16 25
MIKE WIRING (How to Wire Almost Any
MIC to any Tranceiver) .................................................... ages 26-32
LL CHANNELIZER ...................................................................... ages 33 39
S ECIFIC RADIO TUNE-U S
AND MODIFICATIONS ....................................................... ages 40-60
ANTENNA SECRETS .................................................................... ages 61 63
S ECIAL SECTION ON LINEAR
AM LIFIERS SCHEMATICS, ETC ................................ ages 64 75
Secret C.B.
Volume Three
ublished August, 1978
Copyright 1978, All rights reserved in the United
States and most foreign countries
New issues quarterly
Address any and all inquiries
with return address to:
Selman Enterprises
. O. Box 8189
Corpus Christi, Texas 78412
2
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Secret C B Volume III
Introduction
As time progresses, so do advances in electronics Many manufacturers
have sacrificed quality for quantity leaving behind good adjacent channel
rejection and other qualities that make a C B have a good transmitter
and receiver The "Uniden ” and Cybernet chassis, which are manufactured
overseas for American companies, are always an excellent choice in equip 
ment
Contrary to the old myth, ” 23 channels are more powerful than 40 channel
sets, ” the truth of the matter is 40 channel C B ’ s have a much better
receiver than 23 channels! In order to accept more channels, the 23 Chan 
nel sets were redesigned making the receiver more sensitive with less
noise Generally speaking, the 40 channel transmitters are ’ ’ cleaner ” and
more reliable As far as ’ ’ talking power ” goes, I would say that 40 Chan 
nel sets have more potential than 23 channel sets With the right anten 
na, mobile or base, they give more service per dollar spent
Adjacent channel rejection in the receiver is always a problem, and
that doesn ’ t come cheap by manufacturing standards For instance, Colt
has spent more of its manufacturing dollar on noise Crystal lattice
filters are expensive, but necessary A good crystal lattice filter is
the main quality to look for in buying any single sideband radio
Single sideband is growing in popularity, and there is a specific
reason behind this It ’ s certainly not the price, sidebands can be ex 
pensive The reason is simple It ’ s so simple, you can turn your AM
C B set on and hear the reason ’ ’ sunspots ” are the problem They can
cut an AM C B set down in reception and range, where a sideband has the
uncanny ability to ’ ’ cut through the hash ” communicating a longer dis 
tance, even though the noise level is high I am not taking away from
AM C B sets Remember, there is a difference in cost!
If the truth were known, there are certain people who would rather
everyone be on sideband Why? Because, there can be six conversations
on one channel at the same time, the ’ ’ bleedover ” is minimal, and no
linears or power mikes are needed I say this in anticipation of feed 
back Again, this is my opinion
I have received much correspondence from C B ’ ers, engineers, and
technicians from all over the United States and the world I appreci 
ate your letters, ideas, and helpful hints that have made ’ ’ Secret C B ”
a success I do not claim to be an expert, but I will always keep it
simple and tell it like it is!
*
73X ------- ry.
Ibid nay L /Johnson 1)
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COLT 290, 390, 800, SX33
95 Channel Conversion
PARTS NEEDED:
1. 2 each 3K i watt resistors
2 12" 4 conductor ribbon wire
3 1 DPDT center off toggle switch (on-off-on, on
some models a existing panel switch may be used )
4 Power meter
STEPS
1 Remove top and bottom cover of radio
2 Locate PLL02A, just rear of channel selector on
component side of radio Turn radio over and
locate foil pattern of PLL02A on foil
See drawing of foil pattern side of radio
3 Make necessary foil cuts on foil side of P C board
(Follow blow up of PLL02A mounting for foil cuts,
resistor and wire connections )
4. Bridge foil cuts with 3K resistors.
5 Connect properly coded ribbon wire to foil cuts
6 Wire switch per schematic
7 Mount switch at any convenient location
8 Some tuning may be necessary to broad band radio
Adjust Ll , L2 for even power on low of 26 755 and
high of 27 705
9 Adjust RV-2 for 100% modulation
10 Follow normal peaking procedures for maximum power
output using L7, Lil, and L12
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COLT 290, 390, 800, SX33
EXPANDED VIEW
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COLT 480, 485, 1000
135 CHANNEL CONVERSION
Parts needed:
4- Ik resistors
8- TI 1N4148 diodes or equivalent
1- Oak rotary switch 2P-6POS # 399639-511 (Newark Elect ■
cat # 57F889) or equivalent I
18"- 6 conductor ribbon wire
1- power meter
Step 1 Remove top and bottom covers of radio
Step 2 Drill k" hole in rear of radio, 3/4" toward center of
radio from antenna connection for switch mounting
( Use caution not to damage any internal parts of radio
while drilling )
Step 3 Locate PLL02A, just rear of channel selector on
component side of radio Item radio over and locate
foil pattern of PLL02A on foil side See drawing
of foil pattern side of radio
Step 4 Make necessary foil cuts on foil side of PC board
( Follow blow up of PLL02A mounting, for foil cuts,
resistor and wire connections Note 2 foil cuts
on brown lead There will be a total of 5 foil cuts
when finished )
Step 5 Bridge foil cuts with IK resistors
Step 6 Connect properly coded ribbon wire to foil cuts
Step 7 Run ribbon wire to location of switch
Step 8 Install diodes and wires per schematic on rotary switch
Step 9 Mount switch
Step 10 Some tuning may be necessary to broad band radio
Adjust the VCO, T-l, T-2, and T-3 for even power
on low of 26 645 and high of 27 995
Step IL Adjust RV-2 and RV-12 for 1007 plus modulation
Step 12 Follow normal speaking procedures for maximum
power output Using T-6, L-7, L-ll and L-13
Unit is capable of 10 watts AM under full modulation
and 18 watts S S B