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Welcome to MICOR Dot Info www.micor.info "The Motorola MICOR Conversion Site" Much of the information presented on this site was compiled by, and is maintained by, Kevin Custer W3KKC and is Copyright © 1995 - present, all rights reserved
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Note that in Motorola's product line terminology you have either a "mobile" or a "station",
and the latter term is used for both base stations and repeaters.
How to identify
your MICOR
Mobiles are on the top, scroll down for stations
Note that DVP (secure) stations frequently substituted an "X" for
the center letter in the suffix (i.e. a C74RCB became a C74RXB).
Here's a simpler MICOR
Mobile only identification table
Jump to: Generic MICOR (both Mobile and Station) Read this section first
Generic Station Information Low- and Mid-Band Station High-Band Station UHF Station
Generic Mobile Information Low-Band Mobile High-Band Mobile UHF Mobile
Channel Element Info 220 MHz Conversion Custom Built Repeaters Other Information
Information Relevant to Both MICOR Mobile and
Station:
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The actual patent for the MICOR Squelch
chip: M6709, MC6709, SC6709, M7716 640 kB PDF Several squelch articles below refer to this document. |
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The MICOR
Squelch By Kevin Custer W3KKC An Explanation of the MICOR Bi-Level Squelch. |
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Additional Info about The MICOR
Squelch Chip By Robert W. Meister WA1MIK Testing and examination of the MICOR M6709 IC. |
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MICOR based squelch circuit A SEITS article |
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Explanation of Reverse Burst and "AND" Squelch By Kevin Custer W3KKC |
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Pre-emphasis, de-emphasis, clipping, and audio quality in the MICOR By Paul Sexauer K3VIX |
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MICOR Muteboard, muting audio filter amplifier By Kevin Custer W3KKC |
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Modification of the MICOR PL
Encoder By Kevin Custer W3KKC In some situations you want to disable the reverse-burst capability. |
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COS Logic Level Inverter By Kevin
Custer W3KKC A simple circuit to make a positive logic COS from the audio-squelch board for those controllers that require it. |
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MICOR discriminator buffer amplifier Great for NHRC, MCC, and other newer style controllers that mute and have de-emphasis built in |
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MICOR PL Filter By Kevin Custer W3KKC |
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MICOR PL Filter Modification By Kevin Custer W3KKC |
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An "S-Meter" for the MICOR Receiver While this circuit was originally developed to allow a repeater receiver to drive an analog input of an ACC repeater controller there is no reason that it couldn't drive a different brand of repeater controller or even a meter... |
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TLN4310B and TLN4622B Audio
Squelch board - full info (3 pages), 265 kB PDF scan courtesy Eric Lemmon WB6FLY TLN4310B-2 schematic only (horizontal, for viewing on your screen) TLN4310B-2 schematic only (vertical, for printing) You will probably want to print the schematic on legal paper, as it is an extended length diagram. If you are going to do any bench work, I'd suggest printing it on 11x17 paper. |
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Information on MICOR Channel Elements By M. Scott Zimmerman |
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Modification of the MICOR "Sensitron"
450-470 MHz Receiver RF and IF Board for use in the UHF ham band By Kevin Custer
W3KKC A step-by-step procedure on how to modify a TRE1203A (or B) or TLE8032A (or B) 450-470 MHz receiver board to operate properly below about 445 MHz. |
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Motorola made some special order stations in the 440-450 MHz range - either
for well-funded amateur groups, or for the European market (the UHF commercial band in most of
Europe starts at 440 MHz instead of 450 MHz).
Here's the factory documentation on such a
radio. 65 kB PDF donated by Tim Sawyer WD6AWP The three-page writeup is an addendum to the standard manual and covers modifications to the TRE1241A receiver and the TLE1853A exciter, plus a few other notes. |
Non-Band-Specific Station Information:
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Comprehensive conversion of the MICOR Compa-Station base/repeater station By Kevin Custer W3KKC |
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Synthesize your MICOR
Station By Greg Carttar (ex-WAØLCZ) of 3rd St. R & D Production Services Previously an offsite article, now it's here on Repeater-Builder. |
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Modification of the MICOR PL
Encoder By Kevin Custer W3KKC In some situations you want to disable the reverse-burst functionality. This writeup tells you how. |
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Notes on connecting a generic repeater controller to a MICOR station By M. Scott Zimmerman N3XCC |
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Adding an ID-8 to a
MICOR or MSR2000 Shelf By Jerry Matthews WAØUZI Useful to the commercial repeaters as the amateur radio repeater controllers have built-in IDers. While an IDer is not required for GMRS, having one is a real good idea and this article is relevant there as well. |
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S-Com to MICOR station
interface and wiring 19 kB PDF by Bob Hoffman N3CVL This file was recreated from old postscript files. Diagrams only. |
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Another connection of a repeater controller (an S-COM) to the MICOR Unified Chassis Station However this technique will work with any controller that can accept active low COR and PL decode signals and output an active low PTT signal (i.e. one that goes to ground). By Joel Huntley WA1ZYX (offsite link) |
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Modification of the older Station Control
Module TLN4635B By Kevin Custer W3KKC These mods are relevant when using a repeater controller. |
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Parts layout and schematic diagram of the TLN4635B Station Control Module 1.2 MB PDF scanned by Bob WA1MIK |
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Modification of the newer
Station Control Module TLN5970A (or later) By Kevin Custer W3KKC When using a repeater controller. |
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Modifying the TRN4662 Squelch Gate Module as an interface to an external controller By Richard Reese WA8DBW (offsite link) |
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Modifying the TRN4662 Squelch Gate Module for better operation with a repeater controller By M. Scott Zimmerman N3XCC |
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Parts layout and schematic diagram of the TLN4662A Squelch Gate Module 1.3 MB PDF scanned by Bob WA1MIK |
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Conversion of the TRN6006 series Station
Audio and Squelch board By Kevin Custer W3KKC For better audio muting. |
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Modifying a TLN4310 mobile audio and
squelch board for use in a base/repeater station By Kevin Custer W3KKC The TRN6006 is used in a station, the TLN4310 boards are use in a mobile. There are a lot more TLN4310 boards out there than TRN6006 boards. This tells you how to modify a mobile board to work in a station. |
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Conversion of the Compa-Station Receiver Interconnect Board By Kevin Custer W3KKC |
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Documentation on the TLN5167A Intercom, TLN5900 and TLN5993 Station Metering Kit, and TLN1859 and TLN1887 Metering and Intercom Kits Manual # 6881033E28-F 1.6 MB PDF donated by Eric Lemmon WB6FLY |
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The MICOR station had an optional PROM based Identifier card. The MSR2000 page has the documentation on two different but very similar cards (the major difference is the card edge connector). |
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Converting the Unified Chassis Station to
12vDC only 229 kB PDF by Lee Woldanski VE7FET The standard MICOR station power supplies deliver three separate outputs: unregulated +V to the transmitter PA deck, and both regulated +12vDC and +9.6vDC to the unified chassis (the control shelf, exciter and the receiver). In some cases you want to power the station from an existing +12vDC source. This writeup shows how to modify the unified chassis to generate its own 9.6vDC. Non-unified stations can do this mod separately to the control shelf, the exciter chassis and the receiver chassis. |
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Adding a PL encoder to a MICOR station - Courtesy of Bob Laag WA6ISG we know that
Moto had a kit for field upgrading a carrier squelch MICOR station to PL Encode. In addition to
the actual encoder board and the reed the TRN6188A KIT consists of:
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Station Power Supplies:
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Full manual for the
TPN1095A, TPN1096A, and TPN1102A station switching power supplies 5.8 MB PDF file This was a high-resolution scan provided by Don Kovalchik, W8DPK; it was subsequently reduced in size. |
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Full manual for the
TPN1105A/6A station switching power supply and battery charger 3.2 MB PDF The TPN1105A can be wired for either 120v or 240vAC, but the TPN1106A is 120vAC only. The manual is 6881104E92. This supply has the automatic power fail changeover to battery feature, plus a tone generator that puts a periodic beep on the transmitter, control line, or both. |
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Schematic of the
TPN1110 station ferro-resonant power supply 144 kB PDF This schematic is from manual 6881020E44-N and covers both the TPN1110A and TPN1110B models that provide unregulated 13.8v at 25 amps for the PA deck plus 12v and 9.6 volts regulated. |
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Schematic of the
TPN1151 and TPN1152 station power supplies 73 kB PDF The TPN1151A can be wired for 120 or 240vAC, but the TPN1152A is 120vAC only. This is a fully linear supply with separate regulators for the +9.6v, low and high current 12v voltages. |
Low-Band MICOR Station:
Notes:
1) The low-band MICORs came in four ranges, commonly called "splits": 25-30 MHz (very, very rare),
30-36 MHz, 36-42 MHz, and 42-50 MHz. The four articles below are all oriented to the 42-50 MHz
radios. If anyone would like to do a 30-36 MHz to 10 meters conversion article, please let us
know.
2) The low-band receiver is a TLB6851A (25-30 MHz), TLB6852A (30-36 MHz), TLB6853A (36-42 MHz),
or TLB6854A (42-50 MHz). Later versions would have had a different trailing letter.
3) Motorola offered a noise blanker option on low-band mobile radios (marketing called it an
"extender"). That receiver was the TLB6861A, TLB6862A, TLB6863A and TLB6864A series (the last
digit indicated the split, just like the TLB685x series).
4) The TLB685x and TLB686x receivers all have a 5.26 MHz intermediate frequency (IF). The TLB696x
receivers have a 5.36 MHz IF, usually used only in a second receiver situation or on special
order.
5) The 25-30 MHz receiver used an x2 multiplier and high side injection, the 30-36 MHz and 36-42
MHz receivers used x3 and high-side injection, and the 42-50 receiver used x3 and low-side
injection. All of the low-band receivers used the 3-pin K1003 channel element, none have AFC
(Automatic Frequency Control) and the element doesn't have an AFC input pin.
6) The low-band and mid-band stations use a TRN6007A audio-squelch board and it is different
from the TRN6006A board used in the high-band and UHF stations. The difference is two capacitors
(C210 and C216) in the audio path and they are easily changed in the field.
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Conversion of the MICOR Low-band receiver to the 6 meter amateur band By Kevin Custer W3KKC |
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Conversion of the MICOR Low-band exciter to the 6 meter ham band By Kevin Custer W3KKC |
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Another conversion site for MICOR Low-band to 6M Ham Band offsite link to KB6MIP's site |
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Yet another conversion
article for the MICOR Low-band receiver to the 6M Ham Band By Bob WA1MIK With photos, circles and arrows, and paragraphs on the back... |
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Conversion of the 100w
continuous-duty 42-50 MHz PA to the 6M Ham Band By John Haserick W1GPO and Dave Malicki
N1OFJ Also contains the manual sections for the TLB1414C PA and the Power Control Board. |
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Combining Two MICOR Receivers
for Better IF Performance by John Haserick W1GPO and Robert W. Meister WA1MIK Use a second receiver's IF section for additional filtering and better selectivity. |
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We don't have the low-band DVP Station Manual but we do have the high band one. Until we are given one I suggest you start there if you are looking for DVP station info. |
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Would anyone like to do a 30-36 MHz to 10m conversion article? |
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TLB6310A or TLD6340A
Crystal Filter and TLN5120 Installation Kit documentation 327 kB PDF This writeup describes a very sharp notch filter that has to be custom ordered for the exact frequency of interest. It does have between 4 and 6 dB of insertion loss so it can't be used on marginal situations. The PDF file contains both the 6881104A86 (the filters) and 6881104E36 (the installation kit) documents. If you stumble across a filter like this in surplus at a good price, and you ever think that such a filter might be useful someday then it's worth picking it up. You can send it back to International Crystal and they can cut a new insert for you. |
Mid-Band MICOR Station:
The mid-band receiver is a TLC6112A or B, and is identical to the low-band receiver
except for frequency range and multiplier (times 6, high side injection). These were
commonly used as link receivers in paging systems. The crystal filters are also
optimized for the digital modulation data used for paging. These can be converted
to low-band receivers if you replace some coils and capacitors.
High Band MICOR Station:
(220 MHz mods are in the 220 section below)
The high band station power amplifier requires about 200mW for full output. Other
web sites and books say that it takes about twice that. Here's why: The high band
station exciter is specified for 400mW of power output, however, in a stock station
there is always a band-pass filter between the exciter output and the amplifier input.
These filters have about 2 to 3 dB loss, so the actual drive reaching the amplifier
is about 200 mW.
The fastest way to identify the split of your new-to-you Micor is to look at the receiver... a TLD8271 is a 132 to 142 MHz, a TLD8272 is a 142 to 150 MHz, a TLD8273 is a 150.8 to 162 MHz and a TLD8274 is a 162 to 174 MHz unit.
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Comprehensive conversion of the MICOR Compa-Station base/repeater station By Kevin Custer W3KKC |
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Comprehensive Description of the MICOR "Sensitron" Hi-band Receiver By Kevin Custer W3KKC |
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Conversion of the MICOR "Sensitron" High-band Receiver to the 2M Ham Band By Kevin Custer W3KKC |
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Now available: 132-150.8 MHz
helical resonator coils By Kevin Custer W3KKC Get a real 2 meter front-end for your MICOR receiver! |
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Modification of the MICOR Exciter By Kevin Custer W3KKC |
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VHF MICOR PM to FM Exciter
Modification By Kevin Custer W3KKC Convert your PM exciter to True FM! |
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VHF MICOR tuning instructions By Kevin Custer W3KKC |
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Retuning the VHF MICOR Bandpass Filter By Kevin Custer W3KKC |
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A Conversion of a high band MICOR Intermittent Station to a Repeater 4.2 MB PDF By Lawrence Glaister VE7IT |
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Converting a high band PURC Station to a Repeater By Matt Krick K3MK |
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Documentation on
the high band MICOR Preamp model TLD8421A, TLD8421B, TLD8422A or TLD8422B 917 kB PDF
Donated by Eric Lemmon WB6FLY Photos by Tony Faiola K3WX: photo 1 photo 2 photo 3 photo 4 (shows mounting bracket used to mount the preamp on the back of a Spectra Tac or Aux Receiver chassis) (the 15D number visible in the first photo is the casting number, not the preamp part number) Note that if you need a preamp and can't find one that AngleLinear sells a very nice drop-in preamp, and a mobile mounting bracket is available. |
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Conversion of the TLD8422 high-band factory preamp to the 2M ham band By Kevin Custer W3KKC |
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MICOR High Band Service Sheet
Pg 1 This is page 1 of Moto manual 6881101E02-M. 2.2 MB PDF Donated by Eric
Lemmon WB6FLY MICOR High Band Service Sheet Pg 2 This is page 2 of the above. 844 kB PDF |
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TLB6310A or TLD6340A
Crystal Filter and TLN5120 Installation Kit documentation 327 kB PDF |
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Here's how to get the TLN5979A (DVP) backplane working without the DVP modules,
courtesy of Eric WB6FLY:
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UHF MICOR Station:
Information relevant to MICOR Mobiles
being converted to Repeater or Link duty:
Notes:
1) The MICOR mobile chassis has a heat sink rated at only 35 watts - yes, that fact is in
the MICOR mobile manual. Therefore radios higher than 45 watts are best left in mobile service.
2) The VHF MICOR transmitter power amplifier stages use PNP transistors where the UHF radio uses
NPN in the same area. Be careful when you do a rebuild that you have the right parts !!!
3) The normal mounting of a MICOR mobile has the radio mounted essentially upside down (the circuit
boards are mounted in the top of the case facing downward). As such the control connector pinout
is not what you would expect. Here is a drawing of
the pinout viewed from outside the radio, looking at the front.
Generic Mobile Information:
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Front casting modification for a second
antenna connector By Kevin Custer W3KKC Until you have used a full duplex mobile on UHF you really don't know what you are missing. A second antenna jack makes it easy. |
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Duplex modification of MICOR mobile audio and squelch board By Kevin Custer W3KKC |
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MICOR Muteboard, muting audio filter amplifier By Kevin Custer W3KKC |
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Modification of the MICOR PL
Encoder By Kevin Custer W3KKC In some situations you want to disable the reverse-burst functionality. |
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COS Logic Level Inverter By Kevin
Custer W3KKC For making positive logic cos from the Audio-Squelch board. |
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The replacement microphone coiled cord for the MICOR, Syntor, Mitrek and several others (not the Spectra) is part number 083731M01 |
Low-band MICOR Mobile:
Notes:
1) The low-band MICORs came in four ranges: 25-30 MHz, 30-36 MHz, 36-42 MHz, and 42-50 MHz.
2) The low-band receiver part numbers are: TLB5851A and TLB5851B for 25-30 MHz (very, very rare),
TLB5852A and TLB5852B for 30-36 MHz, TLB5853A and TLB5853B for 36-42 MHz, and TLB5854A and
TLB5854B for 42-50 MHz. On all of them the IF is 5.26 MHz, or 5.36 MHz on special order.
3) The 25-30 MHz receiver used a x2 multiplier and high-side injection, the 30-36 MHz and 36-42 MHz
receiver used x3 and high-side injection, and the 42-50 MHz receiver used x3 and low-side
injection.
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Conversion of the MICOR Low-band receiver to the 6 meter ham band By Kevin Custer W3KKC |
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Conversion of the MICOR Low-band exciter to the 6 meter ham band By Kevin Custer W3KKC |
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Another conversion site for MICOR Low-band to 6M Ham Band offsite link to KB6MIP's site |
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Yet another conversion
article for the MICOR Low-band receiver to the 6M Ham Band by Bob WA1MIK With photos, circles and arrows, and paragraphs on the back... |
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Would anyone like to do a 30-36 MHz to 10m conversion article? |
High-band MICOR Mobile:
(220 MHz mods are in the 220 section below)
See the station section for a breakdown on MICOR VHF (high band) receivers.
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Duplex conversion of a standard VHF mobile to repeater By Kevin Custer W3KKC |
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Duplex conversion of Railroad VHF mobile to repeater By Kevin Custer W3KKC |
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Duplex conversion of a VHF mobile to a repeater station By Jim Reese WD5IYT |
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Duplex Conversion of the mobile antenna switch By Kevin Custer W3KKC |
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VHF Exciter Models By Kevin
Custer W3KKC An explanation of the 3 different exciters common to the VHF radio. |
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VHF PM to FM Exciter
Modification By Kevin Custer W3KKC Convert your PM exciter to True FM! |
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VHF board model number frequency
ranges By Kevin Custer W3KKC An explanation of the board numbers on a VHF MICOR. |
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132-150.8 MHz helical resonator
coils for the MICOR By Kevin Custer W3KKC Get the right coils for your 2 meter front-end. |
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Comprehensive Description of the "Sensitron" Hi-band Receiver By Kevin Custer W3KKC |
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Conversion of the "Sensitron" High-band Receiver to Ham Band By Kevin Custer W3KKC |
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Modification of the VHF Exciter By Kevin Custer W3KKC |
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Retuning the VHF Bandpass Filter By Kevin Custer W3KKC |
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VHF tuning instructions By Kevin Custer W3KKC |
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Documentation on
the high band preamp model TLD8421B and TLD8422B 917 kB PDF Donated by Eric
Lemmon WB6FLY Photos by Tony Faiola K3WX: photo 1 photo 2 photo 3 photo 4 (shows mounting bracket used to mount the preamp on the back of a Spectra Tac or Aux Receiver chassis) (the 15D number visible in the first photo is the casting number, not the preamp part number) Note that if you need a preamp and can't find one that AngleLinear sells a very nice drop-in preamp, and a mobile mounting bracket is available. |
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Conversion of the High-band Preamp To Ham Band By Kevin Custer W3KKC |
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Documentation on the 45 watt VHF PA deck 3 MB PDF file donated by Eric Lemmon WB6FLY |
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High Band Service Sheet
Pg 1 This is Moto manual 6881101E02-M Page 1. 2.2 MB PDF Donated by Eric Lemmon WB6FLY High Band Service Sheet Pg 2 This is page 2 of the above. 944 kB PDF |
UHF MICOR Mobile:
Notes:
1) The UHF receiver is a TRE120nA or B (where "n" is 1 to 5), and the IF is 11.7 MHz, or 11.8 MHz
if needed to avoid mixes.
2) The "n" is "1" for 406-420 MHz, "2" for 420-450 MHz, "3" for 450-470 MHz, "4" for 470-494 MHz,
and "5" for 494-512 MHz.
3) All UHF receivers use an x24 multiplier. The high-side versus low-side injection decision was
dependent on several parameters; read the first article below for the details.
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A Technical Explanation of the MICOR UHF Mobile
Radio Set By Kevin Custer W3KKC A walkthrough of how only one channel element / crystal can work for receive, transmit repeat and transmit simplex. |
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Motorola's own
technical description of the UHF MICOR Mobile Radio 2.5 MB PDF Donated by Kevin
Custer W3KKC Section 4, all 33 pages of it, from the official manual. |
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Duplex conversion of MICOR UHF mobile to repeater station By Jim Reese WD5IYT |
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Information on the UHF Mobile Low Level Amplifier (LLA) How to increase the life expectancy By Jeff DePolo WN3A |
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Drill template for the circulator (antenna network) in PDF 250 kB PDF By Mike WM4B |
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Conversion of the MICOR "Sensitron" UHF Receiver to the UHF ham band By Kevin Custer W3KKC |
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Modification of the MICOR UHF Exciter By Kevin Custer W3KKC |
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Documentation on
the UHF preamp model TLE8191A and TLE8192A 531 kB PDF 6 page file from Eric
Lemmon WB6FLY Note that if you need a preamp and can't find one that AngleLinear sells a very nice drop-in preamp, and a mobile mounting bracket is available. |
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Emergency Medical Systems
Duplex / Repeater UHF Mobile Radio manual supplement 15.8 MB PDF
file courtesy of K9ROD |
Custom Modifications, Conversions and Parts
Suppliers for MICOR Mobiles and Stations:
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MICOR Repeater Conversions from
Repeater-Builder Custom Conversions by Scott Zimmerman - from Repeater Builder (the company) |
Channel Element Info:
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MICOR channel element schematic diagrams and other information (with photos) by Scott Zimmerman N3XCC |
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What's inside the K1003/K1004 channel elements (with photos and schematic) by Robert W. Meister WA1MIK |
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Motorola Channel Element information from International Crystal Manufacturing Company, Inc. |
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Motorola Temperature Compensation Capacitors - list and values in PDF donated by Jerry Kessler N4JL |
220 MHz Modifications for the MICOR High-Band
Radio:
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Comprehensive Conversion of the TLD8262A or TLD8262B MICOR High-Band Exciter to 222 MHz By Kevin Custer and Scott Zimmerman (new method) | ||||
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Comprehensive Conversion of the MICOR
High-Band Receiver to 222 MHz By Kevin Custer W3KKC (new method) This writeup covers the following receiver boards (where "x" is 1, 2, 3 or 4 and "y" is A or B): TLD407xy, TLD527xy, or TLD827xy. |
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Conversion of the MICOR VHF exciter
Band-Pass Filter to 220 MHz By Lee Woldanski VE7FET This is the conversion process for the station filter. |
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Exciter 220 MHz Band-Pass Filter
Conversion by David A. Cooley N5XMT This is the conversion process for the mobile filter. |
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An add on 222 MHz amplifier by David A. Cooley N5XMT | ||||
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220 MHz Low Pass Filter by David A. Cooley N5XMT | ||||
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MICOR 222 MHz Modifications Considerations from SEITS | ||||
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Conversion of the TLD5803 MICOR VHF Exciter to 220 MHz By John Slusser WD7F, Craig Walker KD7TXO and David Stanford K7IOU | ||||
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Conversion of the TFD6112 MICOR VHF Helical Band-pass Filter to 220 MHz By John Slusser WD7F, Craig Walker KD7TXO and David Stanford K7IOU | ||||
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Conversion of the MICOR VHF Repeater to 220 MHz By John Slusser WD7F, Craig Walker KD7TXO and David Stanford K7IOU (offsite link) | ||||
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These articles are outdated and are here only for reference.
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Packet Modifications for the MICOR:
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9600 baud modifications for the UHF MICOR By Verne Buland |
Other information relating to the
Motorola MICOR:
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Other Motorola information at WA8DBW's web site By Richard Reese WA8DBW (offsite link) |
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A collection of Miscellaneous MICOR information (that used to be on this page) By Mike Morris WA6ILQ |
Systems 90 Information:
Manuals in this section courtesy of Paul Fraas KDØCST, and were scanned and PDF'd by Eric
Lemmon WB6FLY
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Quick Call - Mobile Selective Signaling Decoder - TLN1389A 1.3 MB PDF |
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Mobile Public Address - TLN1392A 555 kB PDF |
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Mobile
Multiple PL Encoder - TLN1395A, and TLN1396A 1.5 MB PDF TLN1395A (VHF) and TLN1547A (UHF): four tone frequencies, TLN1396A (VHF) and TLN1548A (UHF): eight tone frequencies |
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Quik
Call II Mobile Paging Decoder - TLN1390A, and TLN1391A 1.3 MB PDF TLN1390A: four-reed mobile paging decoder, TLN1391A: two-reed mobile paging decoder |
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Single
Tone Encoder - TLN1393A, and TLN1394A 596 kB PDF TLN1393A: one-tone output, TLN1394A: five-tone output |
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Voice Privacy Adapter - TLN1400A 888 kB PDF |
Scanned Images and
PDF Files:
The full manuals have model charts, installation instructions, circuit descriptions, parts
lists, board X-ray views, schematics, and the various accessories. The individual module
scans were often extracted from these full manuals. Assemblies that were common among
different bands can often be found in these full manuals
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UHF Mobile Instruction Manual 6881015E70-H 14.6 MB PDF file courtesy of Eric Lemmon WB6FLY |
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The Base and
Repeater Control and Applications Manual 6881025E60-F 12.4 MB PDF file courtesy
of Eric Lemmon WB6FLY. Several revisions can be found below, courtesy of Eric WB6FLY.
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UHF Station RF Manual 6881025E50-H 11.1 MB PDF file courtesy of Eric Lemmon WB6FLY |
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Community Repeater Station Supplement 6881025E55-B 5.9 MB PDF file courtesy of Eric Lemmon WB6FLY |
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PURC Control and Applications Manual 6881060E70-B 13.5 MB PDF file courtesy of Eric Lemmon WB6FLY |
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VHF-hi DVP Station Manual
6881036E40-B 18 MB PDF This manual includes the TLN5979A backplane. The full manual has been broken up into three smaller sections:
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250/375 Watt 136-174 MHz Upright Base and Repeater (RT) Station Documentation
for the B83RCB and B93RCB stations. The Power Supplies section is from a 330 Watt 25-50 MHz
B91RCB manual.
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Station Audio and Squelch
board 2.5 MB PDF X-ray view, waveforms, schematic (TRN6006A, TRN6007A) |
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How can you tell at a glance which A/S board you have? The Station A/S boards have a line level pot on them and only uses one of the two mute signals to mute the speaker audio. See this article for a way to utilize the second mute signal for better speaker audio muting. The Mobile A/S board has no such pot and uses both of the mute signals to mute the speaker audio completely. |
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Mobile Audio and Squelch Board layout 157 kB |
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Mobile Audio and Squelch Board
schematic 166 kB Mobile Audio and Squelch board (TLN4310B) |
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Mobile Audio and Squelch
Board 2.4 MB PDF X-ray view, waveforms, schematic (TLN4310B) from VHF-hi manual. |
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Mobile Control Board 1.7
MB PDF X-ray view, schematic, point-to-point wiring diagram (TLN4291B, TLN4292B) from VHF-hi manual. |
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Mobile Radio Interconnect Board relay area 118 kB |
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VHF-hi Exciter Board - A
version 3.5 MB PDF X-ray view, waveforms, schematic (TLD5131A, TLD5132A, TLD5371A, TLD5362A) from VHF-hi manual. PM exciter with FM input for DPL modulation. Uses 4-pin channel elements. |
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VHF-hi Exciter Board - B
version 2.7 MB PDF X-ray view, waveforms, schematic (TLD8261B, TLD8262B, TLD4081A, TLD4082A) from VHF-hi manual. PM exciter. Uses 3-pin channel elements. |
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VHF-hi Exciter Board layout 157 kB |
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VHF-hi 1-4ch Receiver and IF
Board 2.2 MB PDF X-ray view, schematic (TLD8271B, TLD8272B, TLD8273B, TLD8274B) from VHF-hi manual. |
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VHF-hi 5-8ch Receiver and IF
Board 3.8 MB PDF X-ray view, schematic (TLD4071B, TLD4072B, TL4073B, TLD4074B) from VHF-hi manual. This board also holds the transmit channel elements for channels 5-8. |
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VHF-hi Mobile Wiring Diagram 85 kB PDF |
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Rear view of the Mobile Control Head 171 kB |
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Mobile Control Head schematic 77 kB |
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Palm Microphone TMN6054A
documentation 130 kB PDF including schematic This same mobile microphone was used on the Mitrek. Click here for a better scan (486 kB PDF) |
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Station Control Module for Securenet stations 1 MB PDF file courtesy of WA3WOM |
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TLN4293B PL Encoder Module 1.5 MB PDF file courtesy of Bob WA1MIK |
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TLN5731A PL Encoder Module 1.3 MB PDF file courtesy of Bob WA1MIK |
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TLN5970A Station Control Module 1.55 MB PDF file courtesy of Kevin W3KKC and Bob WA1MIK |
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QLN2812A Station Identifier Field Modification Kit 1.2 MB PDF file provided by John Gilbert KA4JMC |
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TLN1552A Station Metering and Intercom Kit Manual 6881018E26-D 825 kB PDF file courtesy of Eric Lemmon WB6FLY |
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TLN5167A Intercom, TLN5900 and TLN5993 Station Metering Kit, and TLN1859 and TLN1887 Metering and Intercom Kits Manual 6881033E28-F 1.6 MB PDF file courtesy of Eric Lemmon WB6FLY |
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Base Station Accessories (Multiple Tone PL Options) Manual 6881106E30-B 4.0 MB PDF file courtesy of Eric Lemmon WB6FLY |
MICOR VHF-hi Exciter transmit frequency spacing:
Bob Swoger, K9WVY points out that the Motorola manual
is in error when it states the High Band MICOR Mobile has a transmitter spread
of only 1.5 MHz. That is what the marketing group told the sales force. Actually,
the transmitter spread is 3 MHz on the standard production radio. The designer
of the first MICOR HB exciter was Jim Cox, a non-ham and laid off shortly after
the MICOR shipped in 1970 due to the fact that he was the oldest and losing his
hair. That first exciter board was single sided and had grounding problems due
to not enough copper foil. This was a problem with the early PC board layout
people. They wanted to start with a non copper clad board and add copper.
Engineers wanted them to start with a double sided copper clad board and remove
copper. Jim's board indeed was only 1.5 MHz wide. Soon after another engineer
named Don Nicklos (spelling?) made a double sided board that solved a lot of
problems with proper grounding. Don told me the new board could easily do 2 MHz
and more. I checked it out and found it could do 3 MHz. Marketing was dead set
against changing the published spec.
Then the State of Wisconsin put out a request for bid for high power high band radios with a transmitter spread of 2 MHz. GE could do this with their standard MASTR II. The MICOR as advertised would require the Wide Spaced Exciter option which would cost $150 more than the GE MASTR II as I recall. My boss at that time had heard that I was running a MICOR mobile on 2 meters without a wide spaced exciter option and called me into the office. He asked me to prove the standard product was as wide as I claimed it was by testing the radio between -40C to +70C. I found I could get more that 3 MHz transmitter separation if I tuned the exciter 1 MHz above the lowest frequency.
We beat GE by $5 per box and won the contract. So, please change the web page to indicate the exciter is 3 MHz wide if it is center tuned 1 MHz above the lowest frequency. -- Bob
About Bob Swoger My name is Robert E. Swoger, K9WVY. I was at Motorola from 1965 until I retired in 2002. I was in the original MICOR Mobile design team from 1969 on. Not only did I design new MICOR radios, I later designed and FIXED designs of standard and custom MICOR Mobile and Bases. When I wrapped it up I was in the design team of Saber, Cosmos and Spectra radios.
Several of the correction and additions to this site have been made
by Bob Swoger, Thanks Bob!
Kevin Custer and the Repeater Builder Group.
MICOR - More Integrated Circuits for Optimum Reliability
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Motorola, MICOR, PL, and a host of other terms are registered trademarks of Motorola
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Image(s) used with permission of Motorola Inc.
MICOR repeater photo courtesy of Mark Tomany N9WYS.
This web page, this web site, the information presented in and on its pages and in these modifications and conversions is © Copyrighted 1995 and (date of last update) by Kevin Custer W3KKC and multiple originating authors. All Rights Reserved, including that of paper and web publication elsewhere.
