Loggings > WEFAX and SSTV

USCG Chesapeake, VA relaying NMG-New Orleans WEFAX 8764U May 26, 2019

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Skipmuck:
It seems that my mistuning the right frequency was the problem! Sorry folks. The correct frequency is 8766 khz USB and 8764.1 khz USB as tuned. Duh....one of those senior moments.

Skipmuck:
I was tuned to 8764.1 USB when a voice transmission came up on frequency at 1530 UTC. It was USCG Marine Weather forecast out of Norfolk, VA. I quickly retuned to 8764 USB as I was off by 0.1 khz. I wonder if these earlier WEFAX were actually on 8764 USB as tuned AND out of Norfolk?

Here's my google drive link to a couple of minutes of the 1530 UTC marine weather broadcast on 8764 USB

https://drive.google.com/file/d/1vBwZSyeu1Yn-WVrsdALiVcvF_QkVWXHR/view?usp=sharing

Skipmuck:
Received this reply from NOAA:
Hi Chris,

Yes, you have stumbled across our marine forecasts that cover the western Atlantic, Caribbean Sea and Gulf of Mexico: Wind Speed Probabilities-Based Tropical Cyclone Danger Graphic, Wind/Wave Forecasts, Surface Forecasts, and Peak Wave Period /
Primary Swell Direction

No mention of the unpublished frequency or location. Now that I have the correct frequency for decode(8764 USB as tuned), I ran the Black Cat app for awhile today the 28th. The signal has some intermittent dropouts and the decodes are unstable. Hmmm...all 3 follow the NMG-New Orleans schedule. Interestingly the NMG outlet on 8503.9 khz USB (8502 khz USB as tuned) is audible but the signal is just above the noise here and fadey. The decodes are stable. The 8764 Khz USB signal was hitting S7.

Started at 1905 UTC


Started at 1925 UTC


Started at 1935 UTC


Here is one I started at 2000 UTC. I tuned from 8502 USB to 8764 USB at 2004, back to 8502 USB at 2008, then back to 8764 USB until the ending at 2011 UTC
(You can see the difference in quality of decode and the stability of the signal)
Soooo....from where is the 8764 USB signal emanating and why the instability?

Skipmuck:

Chesapeake(NMN)
HF Voice Broadcast Schedule
4426, 6501, 8764 kHz (USB)   0330Z1    0515Z2   0930Z1            
6501, 8764, 13089 kHz (USB)         1115Z2   1530Z1   2130Z1   2315Z2
8764, 13089, 17314 kHz (USB)            1715Z2      
1 Offshore Forecasts, hurricane information
2 Highseas Forecast, hurricane information

Broadcast of hurricane and other weather broadcasts from this station may on occasion be preempted, as the frequencies are shared with other USCG stations.

refmo:
NMN is the station I have heard most often there (although I haven't listened lately).  Pt. Reyes and Honolulu also use 8764 (rarely heard here).
None of these stations are officially scheduled to use 8764 during the time you heard the signal, so maybe an unannounced schedule change.
If there is a tropical storm or hurricane in the area, they will often  make additions to the schedule.

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