We seek to understand and document all radio transmissions, legal and otherwise, as part of the radio listening hobby. We do not encourage any radio operations contrary to regulations. Always consult with the appropriate authorities if you have questions concerning what is permissable in your locale.

Author Topic: RBW41? Murmansk Fax 6328.5 LSB 2000 UTC 2 June 2019  (Read 731 times)

Offline ulx2

  • Hero Member
  • *****
  • Posts: 538
  • Kyiv, Ukraine
    • View Profile
    • My DX blog
RBW41? Murmansk Fax 6328.5 LSB 2000 UTC 2 June 2019
« on: June 06, 2019, 1256 UTC »
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about RBW41 in the Worldwide Marine Radiofacsimile Broadcast Schedules by the National Weather Service of NOAA is outdated.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.

RX: Degen DE-1103
ANT: 80 mb dipole
« Last Edit: June 06, 2019, 1301 UTC by ulx2 »
LOC: Kyiv, Ukraine
RX1: Degen DE-1103 portable
RX2: Xhdata D-808 portable
RX3: Airspy Mini SDR + Spyverter
ANT1: 80 mb dipole
ANT2: Long wire (10 meters)
ANT3: Homemade M0AYF active loop
ACC: Homemade passive preselector & phasing device


Offline ChrisSmolinski

  • Administrator
  • Marconi Class DXer
  • *****
  • Posts: 27550
  • Westminster, MD USA
    • View Profile
    • Black Cat Systems
Re: RBW41? Murmansk Fax 6328.5 LSB 2000 UTC 2 June 2019
« Reply #1 on: June 06, 2019, 1323 UTC »
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.
Chris Smolinski
Westminster, MD
eQSLs appreciated! csmolinski@blackcatsystems.com
netSDR / AFE822x / AirSpy HF+ / KiwiSDR / 900 ft Horz skyloop / 500 ft NE beverage / 250 ft V Beam / 58 ft T2FD / 120 ft T2FD / 400 ft south beverage / 43m, 20m, 10m  dipoles / Crossed Parallel Loop / Discone in a tree

Offline Skipmuck

  • Global Moderator
  • Marconi Class DXer
  • *****
  • Posts: 8793
  • Shazam in use at all times as necessary!
    • View Profile
    • Email
Re: RBW41? Murmansk Fax 6328.5 LSB 2000 UTC 2 June 2019
« Reply #2 on: June 06, 2019, 2306 UTC »
Thanks for the info ulx2! This one is on my wanted list to hear and decode!  :)
Please QSL to poorbrookking@aol.com. Greatly Appreciated! All reception and postings using My radio, My antenna, and generally in real time(excluding posting of SSTV images!).
QTH:Springfield, MA
JRC NRD-515 with 43 meter half wave dipole into MFJ 949E Versa Tuner