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Volume 17

Secret CB series www.BellsCB.com

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621 views80 pages

Volume 17

Secret CB series www.BellsCB.com

Uploaded by

bellscb
Copyright
© Attribution Non-Commercial (BY-NC)
We take content rights seriously. If you suspect this is your content, claim it here.
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i bi CONFIDENTIAL 7 rari 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. Its 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. Ifyou are not familiar with electronics, it is better to check for advice 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. ‘This book will not be found at a book store, but can be obtained through your local CB Dealer or Distributor, or direct from Selman Enterprises. Secret CBP Volume Seventeen Published October 1983 ‘©Copyright 1983, Selman Enterprises, Inc. All rights reserved. No part of this book shall be reproduced, stored in a retrieval system, of transmitted by tronic, mechanical, photocopying, recording, fr otherwise, without written permission from the publisher. No patent liability is assumed with respect to the use of the Information contained herein. While every precaution has been taken in the preparation of this book, the pul assumes no reponsibilty for erors or omissions. Neither Is ‘ny liability assumed for damages resulting from the uso of fhe Information contained rel PRINTED IN THE UNITED STATES OF AMERICA Address any and all inquiries to: Selman Enterprises, Inc. P.O. Box 8189 Corpus Christi, Texas 78412 (612) 853-2935 vwanw harctimez29 com ACKNOWLEDGEMENTS SECRET CB WISHES TO GRATEFULLY ACKNOWLEDGE THE FOLLOWING PEOPLE FOR THEIR HELP AND CONTRIBUTIONS TOWARD GETTING VOLUME 17 IN PRINT. THEIR ENCOURAGEMENT AND CONTRIBUTION OF MATERIAL HAS BEEN INVALUABLE. Gary BEDEL WANTED L. Benpick CarL CLARK NEW MODIFICATIONS NEW CONVERSIONS Ro BERT JeNset TECHNICAL TIPS Les JeRNIGAN PROJECT PLANS Emit S, Lanco ETC, ETC, ETC. Mark MILLER H, R. PeTERson RacpH TeDEsco James VAUGHN Brut Wentz Donatp WRichT DORIS says “THANKS” AND A FREE BOOK TO THE ABOVE PEOPLE. www harctimez99.com INTRODUCTION Thanks to my now Co-Author, William G. Wentz, Jn., we have another great volume 0f SECRET CB gor you to enjoy. 1 am very grateful to BLL for sharing his knowledge with us and for his diligence in preparing this volume. Bite has surety saved SECRET CB grom extinction. 1 am also grateful to abe of our readers, espectatly those that have shared their knowledge and experiments with us. Without you we would not have this volume, and with your continued support we can keep going on § on & on We are trying very hard to keep up with new information and new ideas. And again we need your hetp with schematics and any new information you can pass on to us. We now have some good instructions for installing SECRET CB Kit #27 into the Reatistic TRC-490. We also have two hits that will fit the Stakker IX Export model, SECRET CB Kit #13 and Két #33. Tf you Like to work CROSSWORD PUZZLES then you will want to turn to page 79 and get started on the one we have in this volume. Also, if you ane one 0g the first ten to get it connect you will win one of our famous SUPER DIODES. ALE entries must be postmarked by December 31, 1983 and the answer witl be published in SECRET CB Volume 18, We are planning to put a new puzzee in each volume if we get a good response from this one. So Let us know if you Like the idea, We advertised in volume 16 about a Buy/Sell/Trade NEWSLETTER that we thought ake of you readers woutd be interested in. We needed 100 subscribers to get 4t 066 the ground, but as of this writing we have not reached that figure. We are going to extend the subscription period up to the time we come out with SECRET CB Volume 18 which should be around the Last of January 1984. Tf we have not reached the 100 mark by then we wil abandon the idea, So Let us hear grom youl ttt! ALL of us here at SECRET CB want to wish all of our readers a VERY SPECIAL HAPPY HOLIDAY SEASON. Until next time. Atays Sincerely yours, Doris Sefman TABLE OF CONTENTS ACKNOWLEDGEMENTS... - INTRODUCTION... TABLE OF CONTENTS. . "B" KIT BY CARD-KIT ELECTRONICS GENERAL INFORMATION. . "B" KIT INSTALLATION INSTRUCTIONS: COBRA 19XS, MIDLAND 103M, COLT 355. COBRA 20LTD... COBRA 21GTL & LTD, 25GTL & LTD, PRESIDENT ARG & AX44, AR711 & AX711, PRESIDENT ANDREW J. COBRA 29GTL & LTD....... cee COBRA 19X, COLT 210, Gz 3-5805B, MAXCOM 4A, MIDLAND 100M, 102M, 150M, 151M, 800M, 2001, 3001, 4001..... 14-15 MIDLAND 200M. aes sees heal MIDLAND 77-8243, REALISTIC TRC—427.. : GE 3-5804F, PRESIDENT AR-7. K-40's K-401 be ib wince 'nie 22-29 PRESIDENT AX-11. Sawiae tae 24—25) PRESIDENT JAMES K pares 26-27 PRESIDENT "OLD HICKORY". sees 28-29 REALISTIC TRC-425... meee + 30-31 REALISTIC TRC-426 + 32-33 SPECIFIC TUNE-UPS: REALISTIC TRO-211 @ 212. premad MECTRON ME-400 CONVERSION...... aacare) ej 34 TRISTAR 747 - SLIDE MODIFICATION. iereee ae COBRA 25LTD (UPDATE) - MORE POWER/MODULATION. |. 35 SECRET CB KIT #106 INSTALLATION INSTRUCTION FOR TRC-451. 36-38 M58472P PLL CHIP (UPDATE)... FORGOTTEN ACCIDENT. . COBRA 148GTL-B (EXPOR! COBRA 148GTL-B SCHEMATIC PALOMAR 2400 SCHEMATIC........+ COLT510/COMMTRON XII SCHEMATIC. HINTS / KINKS / GOOFS... COBRA 148GTL-DX (EARLY-LATE) PACTS. YOU CAN BUILD - BURGLAR ALARM... YOU CAN BUILD - CUSTOM REGULATED POWER SUPPLY.. GYPSY FREQUENCY CHART & "KIT" INFORMATION. TRAM D201/201A SERVICE NOTES. TRAM XLR 23 Ch. SSB SLIDE MOD. COBRA 148GTL-DX (LATE) UPDAT! TRC-448 ‘EXPANDED SLIDE’ UPDATE. COBRA 148GTL-DX (LATE) ALIGNNENT PROCEDURES. SPECIFIC TUNE-UPS: GEMTRONICS GTX-3323 & MIDLAND 102M.. 59 PLL CHIP INFORMATION........ ee se PACE 8010/8015 (MM55107 - PLL) MODIFICATION pecews een O0501 REALISTIC PRO-54 SCANNER (D.C. MOD.) oar Cease cn Oe Od: VIDEO "DUBBING/COPYING" TIPS.... Berea wait H A505, SPECIFIC TUNE-UPS: SEARS 934.38060700 (PLL 861)... SPECIFIC TUNE-UPS: MIDLAND 1001 (77-001) & 103m (77-103) 65 VCR VIDEO MODIFICATION - TRS-80 12" VIDEO DISPLAY....... 66-69 1!00P'S, WE GOOFED!: V. 4, P. 54 - O2A CHIP INFO.... v. 15, P. 58 - TRISTAR 747....- v. 16, P. 50 - 148GTL-Dx (EARLY) v. 16, P. 72 - RAY JEFFERSON (RET CB INDEX FOR VOLUMES 1 THRU 16... 100P's WE GOOFED! INDEX. CROSSWORD PUZZLE. es www harctimez29.com “Be KIT by CARD-KIT ELECTRONICS READ the article; all F¥'s are in Miz-unless otherwise noted... As stated in the announcenent (Vol. 16, pg. 8) the principles used in the development of the "BY Kit are quite simple, All PLL Chips using a .455 off-set shift, can be reversed in their shifting direction. ‘The VCO output is normally used during receive as the Local Oscillator (L.0.) Frequency. During transmit it is shifted up by «455 and combined with the Reference Oscillator Frequency (Ref. F) of 10,24, to generate the Transmitter Frequency (TX-F). During receive the L.0. Freq. is beat with the incoming RF signal which creates the 1st Intermediate Frequency (IF) 10.695. This lst IF is then beat with the Ref. F. (10.24) to create the 2nd IF of .455... The 2nd IF is then rectified/detected and the +455 is filtered out to create the Audio Frequency (AF)... However, there is a second frequency that can be received that 4f it 4s allowed to combine with the Ref. F will also create 8 2nd IF of «i455... This frequency is referred to as the Anti-Inage Frequency. This 4s what ocours: Symbol- )(, = Mixed or Combined with.. + 270075 )( 16.380 = 10.695 )( 10.24 = 455KHe + 26.165 )( 16.380 = 9.785 )( 10.24 = 455KHz The Anti-Inage is prevented from entering the 2nd Mixer Stage by a ceramic or crystal filter. This filter passes the 10,695 ani Dlocks the 9.785... Now, if we change the direction of shift on the PLL Chip, the 1.0. is L55KHr higher than normal during receive, Transmit is 455kiz lower than normal. Example: 27.075 (Ch-10) becomes 26.620 TX-Ff. During receive the VCO Output of L.0. Frequency 16.380 becomes 16.835ee« Now to look at it graphically... IMAGE, + 272530 )( 16,835 1-695 )( 10.24 = LssKHe ANTI-DOGE.... 26.620 )( 16.835 = 96785 )( 10.24 = 455KHz Now the Anti-Inage becones desirable and the Inage is urlesirable frequency. Since the Ist IF of 9.785 is blocked ty the 10.7 ceramic filter, it must be replaced. The above information is strictly to remove ary mystery about what the "B Kit" is designed to accomplish, Namely to reverse the direction of PLL shift and switch filters. At presont, there is one other requirement. needed within the unit to be modified, besides having a 455KHz offset shift, The unit must also have a tuning tank preceeding the ceramic filter. This requirement will hopefully be eliminated in the future, ani add nore units to list of those modifiable. This change to the "B Kit" has already been tested. Delay is getting the necessary components to replace the filters, Additional units made possible to modify by the component change will be featured in up-coming volunes of "Secret CB. Order your kit from Selman Enterprises - ask for Kit #136"B". www harcdtime7ze9 com GENERAL INSTRUCTIONS: Before starting your modification you should decide if you wish to make a straight installation, which gives frequencies 26.510 thru 26.950 in 10KHz steps. Or to be compatible with older sets and have 26.515 thru 26.955 also, All that is needed is to install the SPDT switch provided or mount the variable capacitor on one of the existing switches. If you do not wish the 26.515 thru 26.955, omit all instructions under S5KHz OFFSET and do CHANNEL CONVERSION only, How to make up the SPDT switeh is illustrated in "Secret CB¥; Vol-14, Pe. 21... "B Kit" will use both a new switch and capacitor; Capacitor is smaller in size, but same value; Switch now has only two terminals. ».

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