What is this?

[Planeguysexploration]

I found a strange sound on ~7.1 MHz, (my radio has a slide tuner so it is hard to tell the exact frequency it is on however it is quite accurate). I was wondering if anyone knew what kind of encryption this is, or if it is encryption at all.

 

[ka3jjz]

You're in one of the many ham bands, so encryption is not allowed here. It's hard to be sure, because it's not tuned correctly, but it sounds like one of the Multi Frequency Shift Keying (MFSK) or faster modes that use Phase Shift Keying (PSK).

With the right software, it's readable...Mike

 

[nd5y]

It's multiple 60 wpm Baudot RTTY stations on slightly different frequencies heterodyning with eachother.
Probably a RTTY contest was going on when the recording was made.

 

[AK9R]

The CQ WPX RTTY contest is this weekend and started yesterday evening at 0000Z.

 

[dlwtrunked]

It's multiple 60 wpm Baudot RTTY stations on slightly different frequencies heterodyning with eachother.
Probably a RTTY contest was going on when the recording was made.

Definitely what it is and he should be turning them in single-sideband mode rather than in AM mode (but his radio may not have that mode).

 

[Planeguysexploration]

Definitely what it is and he should be turning them in single-sideband mode rather than in AM mode (but his radio may not have that mode).

Yeah,my radio does not have that capability

 

[dlwtrunked]

Yeah,my radio does not have that capability

If you really want to explore HF signals other than broadcast stations, you will want a receiver that can do LSB and USB (and that will also allow cw and RTTY). Note (seeing your user name), that aircraft communication on HF are also USB.