Tuesday, 23 December 2008

E25 strange message

My recorder got a strange E25 message on 9450 kHz.

The transmission started at 1207z, at 1208z there was 1000 Hz tone, then at 1213z the song "Inte Omri". After that, at 1216z the mechanical E25 lady started calling "830 26 835" i.e. a "control" message to 830 and a (strange) message to 835:

9999 x8, "Rebeat" x3 at 1221z, QRT at 1224z.

Just a string of eight 9999...

Signal strength was weaker than usual as a typical broadcast station (probably WYFR Family Radio) was in the background. This is a part of the transmission recorded in USB.

Wednesday, 10 December 2008

E10 Jammers get aggressive

Right now (1830z) there are two Jammers on 4880 kHz. E10 sends a 115-group message starting with "GHRCA..." to ULX, and both Jammers are on the same frequency! Is this a mistake, or a ferocious attack by all means, to ULX?

So far I believe that whoever operates the Jammers, can transmit at most with two jammers. This time he/she decided to use both Jammers on the same frequency.

Here is a part of the transmission. The Jammers sometimes nearly wins ULX. Also take a closer look at their time offset in the following spectrogram images:
There is a ~25ms time difference between the two Jammer signals. Well, you can hear and see that both remain constant in terms of strength (ok both affected by a slow QSB) so I don't think this is a weird propagation phenomenon. If any of you have a different opinion, feel free to post.

The Jammers stopped at 1851z, while E10 continued with the repeat of the message, plus a weaker broadcast station in the background. E10 QRT at 1855z and the BC QRT at 1859z.

Thursday, 4 December 2008

Another E17 transmission

At 1452z on 10240 kHz I found E17 sending another 50-group message. The transmission was in progress and ended at 1458z with "538 538 50 50 0 0 0 0 0" (slow zeros). No breaks/restarts this time, even the signal strength was better (S9 with peaks +10 or +20dB).

Audio sample.

E17 found on 8180 kHz

8180 kHz was set on my VFO since earlier this morning, after successfully recording three SK01 transmissions. At 1100z I switched from the E25 memory (do I need a memory for E25? Hihihi!) to VFO, to set an E03a frequency and check if E03a was on air.

And... SURPRISE! The E17(z) YL was on 8180, calling "274" but had several problems, trying to send a 50-group message (274 986 50 30238). She started again and again several times, occasionally having low audio level.

Here is the complete (24 min) transmission.

And here's a typical transmission of E17z. This one logged on 27/11/2008, 0800z, 11170 kHz.

E17z (and E17) belongs to IA family (format similar to E06/S06). E17 believed to be some kind of training net, because of the problematic transmissions. Its sister, E17z, is more accurate :-)