Batboard

I have a box of various parts and boards lying around and need some help figuring out what they are, any help would be greatly appreciated

TFC-6021A 4-23-73 other markings T74MST3680AV SP1 (VHF-LO ??)
TFD-6131A 9-30-70 (VHF HI ??)
TFE-6120A 9-30-71 (UHF ??)
TFE-6130A 9-07-73 other markings TTE1292AJ SP1 (UHF ??)

NLN-5114A some type of phone interconnect board

TLD-1693D Micor Transmitter Unit ?

TLE-1231A Tx assembly of some kind

Whoa ... What you're asking for even stumps Carnac.

The TFC-6021A would indicate some assembly for Mid Band 72 to 76 MHz but I think you should go back and make sure that the TFC isn't really a TFE from the other high level Model # T74MST3680AV SP1. This sounds like a Specialty Products MoTran 90~100 Watt UHF Mobile with multiple Tone PL and Frequencies. The TFE-6021A could be a UHF Wide Band RF PA but I'm just taking a wild guess at this point.

The TLD-1693D is a Micor Range 4 VHF Base Station 105 Watt Continous Duty RF Power Anplifier 162 ~ 174 MHz.

The other items are a bit tricky to identify without having the ability to look at them so if you could post JPG photos the gang of people here might be able to better identify each item for you.

I've seen the Micor TLE-1231A but it's been too long for me to put my finger on the UHF assemnly and how it's used.

Letters in the RF assemblies such as i.e. examples are listed below:

TFA indicates H.F. Low Band 2 ~ 30 MHz
TFB indicates VHF Low Band 25 ~ 50 MHz
TFC indicates VHF Mid Band 72 ~ 76 MHz
TFD indicates VHF High Band 132 ~ 174 MHz
TFE indicates UHF Band 370 ~ 520 MHz
TFF indicates 700/800/900 MHz Frequency Bands

Dan

T74MST3680AV SP1 is a high power Motran UHF 450 - 470 mobile. 1974 vintage. As Dan says, "90~100 Watt UHF Mobile with multiple Tone PL and Frequencies". These came in four frequencies and some were twelve frequencies. The MPL ( multi PL) was part of the systems 90 control head configuration.

Thanks a lot, I checked the parts again and they were correct. The TLE-1231A has the TFE6120A and TFD6131A filters attached to it, thats what i fount odd. Using a spec-an i was able to figure out the overall freq and type of filter. it seems that one is a high-pass that feeds into the other a tunable bandpass.