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Note that in Motorola's product line you have either a "mobile" or a "station",
and the latter is a fixed station - either a base or a repeater.

How to identify your MICOR    Mobiles are on the top, scroll down for stations
Here's a simpler MICOR Mobile identification table

Useful MICOR Manuals        Click here for how to order manuals
Motorola made a separate manual for each frequency range, and instead of duplicating all the pages on the control shelf in each one combined all the non-frequelcy sensitive sections into a separate manual.   To work on your base or repeater you will need BOTH the "Control and Applications Manual" AND the appropriate RF manual.

	Base and Repeater Control and Applications Manual 68-81025E60 (non-RF information common to all stations)
	Compa-Station Base & Repeater Radio 25-50 MHz 100 watts 68-81013E60 (Low Band)
	Compa-Station Base Radio Remote Control 132-174 MHz 68-81013E65 (High Band)
	Base and Repeater Station 450-470 or 470-512MHz 68-81025E50 (UHF)
	Mobile UHF (standard and wide spaced) 68P81015E70
	Mobile high band 68P81008E40 Mobile high band wide-spaced supplement: 68P81014E15

MICOR era radios have relatively narrow RF bandwidth. The maximum separation between two transmit frequencies in a standard high band MICOR is spec'd in the manual at 1.5 MHz, however, according to an original MICOR design engineer at Motorola, the exciter is capable of operating 3 MHz wide if it is center tuned 1 MHz above the lowest frequency.   The wide-spaced mobile series offered variations with wide-spaced receive, or transmit, or both.   The wide-spaced receiver has a second oscillator / multiplier and front end, the wide-spaced transmitter has a second exciter multiplier chain, thus one high band radio can have two 1.5 MHz (3 MHz) wide windows separated by up to 12 MHz from each other, and the channel switch selects the appropriate front end or exciter as well as which channel element.   The high band wide-spaced supplement is 68P81014E15 (note that the main high band mobile manual is 68P81008E40 - you will need both manuals for your wide-spaced radio).   The wide-spaced manual also has the information on the high-band extender-equipped receivers.   The regular UHF mobile manual has both the standard and the wide-spaced info.

The Spectra TAC Connection...
The name "Spectra" is used in two very different Moto product lines: there is the Spectra mobile radio, which has it's own page here at Repeater Builder.com, and there is the Spectra TAC receiver voting product ("TAC" = "Total Area Coverage" in the Moto catalog). What does this have to do with the MICOR? The Spectra-Tac receiver is a separate rack mount chassis with the model number TLN1991x (where "x" is an A or a B) regardless of the frequency band (low band, high band, UHF, 800mhz or 900mhz. This chassis holds a MICOR receiver board and any supporting circuitry. The TLN1991 is not a receiver. It is, according to Motorola, a "Receiver Housing Assembly" that is used for all models of SpectraTAC voting and satellite receivers. It is the rack-mounted box that contains the receiver, power supply, and any modules or cards) that are used in the particular application. These cards resemble those in a MICOR repeater control shelf however the cards are NOT compatible with a Micor shelf, and Micor cards are not compatible with a Spectra-TAC shelf. Most surplus Spectra-TAC chassis have a self-contained AC power supply, but some ran from external 12vDC. These chassis are useful as point-to-point link receivers, or when you need to convert an ex-wireline paging base station into a repeater. In most cases you will find a model number plate (or a model number stamped on the unit) in the format of:
C03RTB1108C for a High Band Voting Receiver without PL
C04RTB1018C for a UHF Band Voting Receiver without PL
C03RTB3108C for a High Band Voting Receiver with PL
C04RTB3108C for a UHF Band Voting Receiver with PL
N03RTB1100C for a High Band Satellite Receiver without PL
N04RTB1100C for a UHF Band Satellite Receiver without PL
N03RTB3100C for a High Band Satellite Receiver with PL
N04RTB3100C for a UHF Band Satellite Receiver with PL
The leading "C" indicates Compa series cabinet, a leading "N" indicates no cabinet was shipped with the unit. The "03" indicates 136-174MHz, the "04" indicated 406-512MHz. The RTB indicates a base station Micor line product, the next digit as a 1 indicated carrier squelch, or a 3 indicates PL. The Next 1 indicates narrow band. The 00 indicates one frequency satellite receiver, the 08 indicates 1 frequency and a voting encoder.

	Spectra TAC Voting and Satellite Receiver Instruction Manual, 6881039E45, about $12 in Feb. 2007.
	Spectra TAC Comparator Reference Manual, 6881039E50, also about $12 in Feb. 2007.
	Both contain full specs, installation, maintenance, troubleshooting, schematics, board layouts, and parts lists for the receivers, all plug-in modules, the power supply, and the chassis / backplane. There are sections for VHF low-band (25-50), mid-band (72-76), and high band (132-174), UHF (406-512), and 800 MHz (806-821) receivers. The later revisions contain the information for the 900 MHz receiver.

Information Relevant to Both MICOR Mobile and Station:

	The MICOR Squelch     Explanation of the MICOR® Bi-Level Squelch.     By Kevin Custer W3KKC
	MICOR® based squelch circuit   A SEITS article
	Explanation of Reverse Burst & "And" Squelch     By Kevin Custer W3KKC
	Pre-emphasis, de-emphasis, clipping, and audio quality in the MICOR   By Paul Sexauer K3VIX
	MICOR Muteboard®, muting audio filter amplifier     By Kevin Custer W3KKC
	Modification of the MICOR PL Encoder   In some situations you want to disable the reverse-burst capability   By Kevin Custer W3KKC
	COS Logic Level Inverter  A simple circuit to make positive logic COS from the audio-squelch board for those controllers that require it   By Kevin Custer W3KKC
	MICOR® discriminator buffer amplifier     Great for NHRC, MCC, and other newer style controllers that mute and have de-emphasis built in
	MICOR® PL® filter   By Kevin Custer W3KKC
	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...
	Schematic of the TLN-4310B-2 mobile audio-squelch board   scanned from the mobile manual This is oriented horizontally, for viewing on your screen.
	Schematic of the TLN-4310B-2 mobile audio-squelch board   scanned from the mobile manual This is oriented vertically, for printing (you will probably want to print it 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.
	Information on MICOR Channel Elements   By M. Scott Zimmerman