HFU HF Underground
Loggings => WEFAX and SSTV => Topic started by: ulx2 on June 06, 2019, 1256 UTC
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The fax chart has been received on the 2nd of June 2019 on 6328.5 kHz (center frequency). Weather fax transmissions are quite regular at 20.00 UTC (±2 minutes) and are being probably provided by RBW41 Murmansk. Facsimile broadcasts at other time slots are also possible on this frequency: the station was observed by other DXers at 03.30, 04.50, 10.30, 13.30 and 14.50 UTC too. Unfortunately, the most of information about RBW41 in the Worldwide Marine Radiofacsimile Broadcast Schedules by the National Weather Service of NOAA is outdated.
As the station uses inverted shift, the signal must be received in LSB mode (instead of USB) for the correct decoding. The quantity of shift is also non-standard: 1000 Hz. Other settings: 120 RPM / 576 IOC, with no APT.
The main trouble during reception of these transmissions at 20.00 UTC is the constant heavy QRM from another russian utility station on 6328 kHz using CIS-36-50 mode. One can see the disturbance as a wide white strip on the decoded chart.
(http://ulx2.byethost24.com/wp-content/uploads/2019/06/RBW41_6328_5_02062019_2000z.jpg)
RX: Degen DE-1103
ANT: 80 mb dipole
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Nice catch! Not the best time of the year for reception here, but I can set an overnight SDR recording and see what pops up.
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Thanks for the info ulx2! This one is on my wanted list to hear and decode! :)