Radio info

Mikemc · Post by **Mikemc** » Tue May 15, 2018 7:44 pm

My 1952m38A1 has a radio installed in it. It has the following info on it. REC-TRANS-RT-671GRC serial #800452. The power supply has app-112/GR serial #26230 on it. I have done a few searches and not found a manual for this specific radio. Can someone help me identify it and point me to the right manual. Thanks, Mike McMahan

OKCM38CDN · Post by **OKCM38CDN** » Tue May 15, 2018 8:03 pm

From what you have posted you have what is commonly known as a RT-67 Setup With a PS-112 Power supply.

Similar radio, different freqs... Manuals will be the same as they cover all the radios (RT-66, RT-67, RT-68 )

http://www.n6cc.com/vrc-10-rt-68-transceiver

If you are a Ham Radio Operator the RT-68 is the unit to have as it will operate in the 50 Mhz Ham Bands...

Hope this helps...

Post by **wesk** » Tue May 15, 2018 11:32 pm

REC-TRANS-RT-671GRC serial #800452

Hi Mike,

That number is not quite right. Should be RT-67/GRC.

Take a look in my photo album's sub-album "Jeep Radios":
http://www.willysmjeeps.com/v2/modules. ... _album.php

The military used three separate frequency bands for Armor, Artillery, & Infantry up thru the 80's.

Your setup is a VRC-9 for an artillery unit.

For a full size view that is more readable: http://willysmjeeps.com/v2/modules/gall ... 01_001.jpg

You will want several manuals. Operators and Maintenance.

TM 11-286 Radio Sets AN/VRC-8, -9, & -10 MAR 1951

TM 11-289 Recv'r / Trans. RT-66/GRC, -67/GRC, & -68/GRC. DEC 1953
http://www.radionerds.com/images/4/4d/TM_11-289.pdf2

TM 11-5036 Power Supplies PP-109/GR & PP-112/GR DEC 1954
http://radionerds.com/images/a/ab/TM_11-5036.pdf

These will handle most of what you need to know.

This very nicely done Army Radio Web Site should help you as well: http://www.greenradios.com/Radios/Ameri ... anuals.htm

Mikemc · Post by **Mikemc** » Wed May 16, 2018 8:24 am

Thanks for the replies. Still trying to learn about this stuff. Wes you were right. It is 67/. Guess I really have the wrong radio in it. The Jeep is marked with Texas National Guard 36th Infantry 143-3. If I understand the chart it should have a 68/ for Infantry. Can someone tell me if any of the frequencies in the 67/ are used for anything today. Looks like the 68/ still works on the ham frequencies. Thanks again. Mike

Post by **wesk** » Wed May 16, 2018 8:56 am

Best place to learn and talk radios is on one of the several really good radio group sites.

RF Frequency Allocations Chart will answer this question.

https://www.ntia.doc.gov/files/ntia/pub ... _chart.pdf
A little tough to read

https://transition.fcc.gov/oet/spectrum ... ctable.pdf
Page 17 & 18 lists 27.0 thru 38.0.

radtech · Post by **radtech** » Wed May 16, 2018 11:58 am

Only the frequencies of the RT 66 are not used today 20-27.9mc .frequencies 30mc up are still used by the US military.

Foxmike · Post by **Foxmike** » Wed Jun 20, 2018 12:08 pm

The RT-67 and RT-68 look identical, aside from the frequency readout in the viewing window.

The frequencies in the -67 and not used very much and for all practical purposes, you won't hear anything on it. I am a fan of running audio from your smartphone or modern radio to a speaker. That way, you can simulate radio traffic for displays and not have to get the old radio up and running.

mdainsd · Post by **mdainsd** » Wed Jun 20, 2018 5:43 pm

Yes. Period correct music coming from the low-fi speaker really sets off a display. edit in clips of seoal city sue and it is like you are standing beside a time machine.

mdainsd · Post by **mdainsd** » Wed Jun 20, 2018 5:50 pm

RT-67/GRC is associated with Artillery frequencies of the period,

The pair of units you have would be a "Radio Set AN/VRC-9" provided you have the mount MT-299/GR, control box C-375/VRC and the antenna components (I have the numbers if you care).

4x4M38 · Post by **4x4M38** » Mon Jul 02, 2018 9:42 pm

Hey Mike,
I sent you a pm.