Amateur Radio Stack Exchange
Amateur Radio Stack Exchange

Questions tagged [military-surplus]

Questions about military surplus radio equipment, especially related to converting them for amateur radio use.

11 questions
7
votes
4 answers

Shaving Quartz Crystal for New Frequency

Back in the 1960s during my Novice days I operated on the 40-meter band only with 4 different quartz crystals that determined my transmitting frequency with my Eico 720 CW transmitter. I had heard about other old-timers who would shave (or…
K7PEH
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5
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2 answers

Can anyone identify this military radio?

Hoping someone can identify the following military radio. I spotted it at the curb and decided to make it a land-fill diversion project...
radiorabid
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3
votes
1 answer

What is this military radio?

Please help me identify this piece of equipment. It looks military spec, but don't know anything about it. I want to look up some history about what it was used for. Here are more photos.
Leo Portas
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3
votes
2 answers

Dielectric Constant of Insulation/RF Permeability

I recently purchased a 500-foot roll of military surplus 14 AWG stranded copper wire at a hamfest for next to nothing . It is Prestolite M13486/1-6 (spec sheet). It has very thick chlorinated polyethylene (CPE) insulation. The outside diameter is…
W2ASC
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3
votes
1 answer

What are the parameters and necessary features of a Gunn diode oscillator cavity?

There are a ton of old USSR Gunn diodes available on ebay and I'm looking for a cavity that can make use of them. I am willing to machine one myself if necessary, but I'm unable to find any decent schematics. They either leave info out or they look…
Synaps3
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2
votes
2 answers

Identify this “large TNC” coax connector

I have recently acquired a nice looking dummy load on military surplus sale. Being relatively new to the hobby, I assumed the connector on it was something common. Turns out it is not. So far nobody has been able to tell what it is. The most…
Mchl SP5MKL
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2
votes
4 answers

Suitable acoustic foam rubber for headphones?

These are photos of the headphones that I use in my ham shack. As you can see, the dark gray foam rubber inside is deteriorating, and I need to replace it. It appears to be open-cell foam "rubber" between 1/8" and 3/16" thick. One of the headphones…
Mike Waters
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1
vote
1 answer

How is the PRC-152 able to achieve such a wide frequency range?

I am referring to the Harris Falcon III designed for military. It has a frequency range from 30MHz - 870MHz. However, when I look at commercial radios, their frequency ranges are usually limited to specific bands (i.e. 137-174MHz and 400-480MHz). …
user279043
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1
vote
2 answers

I need help identifying what I believe is a military radio

I'm hoping this question is okay to ask here. While this question is not strictly amateur radio related, I think this is the best community to ask. I'm looking for any information on this. Unfortunately, I have no real information on it other that…
zgyork
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1
vote
4 answers

Can't identify old Chinese(?) and American radio/telephone

I have searched image banks and Googled period radios, but I can not identify these old units. I picked them up overseas in SE Asia and I got them as projects to teach myself enough to challenge the Advanced Amateur Operators certification exam. I…
JoeG
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0
votes
1 answer

Identifying the signal picked up at 363mhz with sdr++. It is from Burmese military's communication. I want to know what it is and how to decode it

As shown in the picture, I want to identify the signal and how can I decode it, please. Here is the link to audio.wav file: https://u.pcloud.link/publink/show?code=XZRoY5VZggSdx8NPqKp3hAOaphcsKVVCqrik
Maung Maung Gyi
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