263.925 Data

[mancow]

Can anyone identify this mode of encryption. It was monitored this evening on 263.925 in FM mode.
It is in MP3 format.

It kind of sounds like some sort of four level modulation similar to what is heard from a raw P25 CAI transmission or FLEX paging.

263.925 data.zip

 

[nightwatch]

DES satcom

 

[mancow]

I guess a better question would have been, what type of modulation is it?

 

[prcguy]

I don't believe DES is used on satcom, only a few radios like the PRC-117F and Motorola URC-500 even have that option.
prcguy

DES satcom

 

[nightwatch]

NBFM and yes they do use DVP and DES along with a few others.