[Boatanchors] Radio Signal scrambling

[howard holden]

The WAV file sure sounds like SSB recorded with no BFO. Any idea of what frequency it was recorded on?

Howie WB2AWQ

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From: KA2PTE<mailto:ka2pte at 3950.net>
Sent: Monday, January 10, 2022 3:47 PM
To: boatanchors at mailman.qth.net<mailto:boatanchors at mailman.qth.net>
Subject: [Boatanchors] Radio Signal scrambling


Curious if anyone is familiar about the types of scrambling used in
military or private type radios, as I have a vintage tape recording
where 2 stations are transmitting in a scrambled type of audio.

At first I thought it was SSB, then was advised that since its on a very old
70's cassette
tape, the tape material has degraded, lost its properties and is the reason
why there
is this kind of distortion present.

Since then I have had a few audio professionals try to clean it up to no
avail.
Then I noticed the cass tape housing was missing the felt pad inside that
presses on the play head
when in play mode. I thought that was the entire issue, but after an entire
transplant of the tape
into a new housing with the felt pad, the noise and distortion is still
there. A segment of the audio
 can be heard in a wave and ogg file here:
https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.mediafire.com%2Ffile%2Fxo8nw1vbyigpbvo%2FAirstrike.zip%2Ffile&amp;data=04%7C01%7C%7Cd142f1313c3a4efee12d08d9d4938d1e%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637774552457775793%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&amp;sdata=572kjAwbzDy4B6Rjvq4zklkAb2rbLXMXwMXtQEosTRU%3D&amp;reserved=0

Today I played more of the tape and about half way through, the 2 stations
get in touch with another 2 stations
and they are heard perfectly, but anytime the other 2 stations transmit,
they sre still distorted and not very readable
which is why I think this is a secure channel between them I believe.

Thought maybe some of the older vets around that did radio back then may be
able to know for sure if its a scrambler
or maybe a way to clean it up.

--
Steve Hearns [ KA2PTE ]


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