Thursday, 26 April 2007

E25 in USB under 1000 Hz tone and DRM

After being absent for a couple of days, I checked for E25 news. A carrier was present on the well-known frequency since 1030z today. At 1244z a 1000 Hz tone was up and later, a guy started calling "780 785 47 788 38 41 45 46" (a rather odd calling session, which anyway implied that a message will follow for Agent "780"). Indeed, that happened, and a 11-group message followed for Agent "780". The tone gone near the repeat of the message. Here is the message:

9405 3111 0310 3238 5429 9388 5757 2587 6001 6341 0310

The 5th group was 5428 then changed to 5429 in the repeat.

And here is the processed sample to remove the 1000 Hz tone. It is recorded on USB and near the end of it I switched for a couple of seconds to AM and then back to USB for comparison, so to make clear that it was a USB transmission. The DRM station interfering is Voice Of Russia. Check here for more info. Scroll down and click next to entries for 9450 kHz.

The guy says "Repeat" instead of the usual "Rebeat". Arabic language has no "p" so maybe that's the reason why E25 operators say something like "Rebeat" instead of "Repeat".

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