Archive for the ‘Uncategorized’ Category
Marine Radiofax Weather Charts Via Shortwave Radio – WEFAX
June 16th, 2024 | 
Author: Weather out over oceans? That, and more.
More than international broadcast stations and amateur radio operators exist on the shortwave radio spectrum. For instance, any non-broadcast signal that is not amateur radio is often lumped together into a category known as Utility Radio, abbreviated, UTE. To dig deeper into UTE activity, you could check out the UDXF – the Utility DX Forum, located here: https://www.udxf.nl/
Utility stations (UTE) are quite common, from marine (ships, fishing vessels, etc.), transoceanic air traffic (international passenger or cargo jets and other aeronautical trans-oceanic radio traffic), to military radio (weather, coordination, and much more). UTE is a rich subdomain of the radio experience.
As an amateur radio operator, I listen to and monitor utility stations on shortwave, at times when not operating as an amateur radio station. I check weather for air traffic or for marine traffic, because it helps me see the larger-scale weather patterns.
One of the captured weather images via shortwave radio.
Here is a video I made of my reception of weather charts via shortwave radio from radio station NMC, at Point Reyes, CA, using FLdigi software to receive these weather fax transmissions:
WEFAX 22.527 MHz on 2024 JUNE 14
[embedyt] https://www.youtube.com/watch?v=9N66y9HFX_Q[/embedyt]
This video is a screen and sound capture of my reception of weather charts and images by shortwave radio, from a station in California running about 4 kilowatts of RF power. This HF WEFAX (Weather Facsimile) service is on every day for ship (marine) weather dissemination so that ships out on the ocean can get weather charts and images not by satellite, but by receiving shortwave signals.
Below is a snippet from the published schedule from Point Reyes WEFAX Radio, callsign NMC, as follows:
22527 kHz – tune offset 1.9 kHz (see note, below)
UTC WHICH CHART ----- -------------------------------- 19:13 TROPICAL GOES IR SATELLITE IMAGE 19:23 WIND / WAVE ANALYSIS 19:33 96HR SURFACE FORECAST 19:43 96HR WIND/WAVE FORECAST 19:53 96HR 500MB FORECAST 20:03 96HR WAVE PERIOD / DIRECTION -------------------------------------
The above snippet of the NMC chart transmission list is from the page, “NMC Point Reyes, Marine Radiofax Broadcast Schedule” found at:
https://weatherfax.com/nmc-point-reyes/
One of the captured weather images via shortwave radio.
Here is a detailed description of the weather charts, and online access is at:
https://www.weather.gov/marine/radiofax_charts
Note: In the video, you see that I am tuned to 22.526 USB thus I was tuned to 22526 kHz USB, based on this: “Unless otherwise stated, assigned frequencies are shown, for carrier frequency subtract 1.9 kHz. Typically dedicated radiofax receivers use assigned frequencies, while receivers or transceivers, connected to external recorders or PC’s, are operated in the upper sideband (USB) mode using carrier frequencies.”
==================================
Source:
WORLDWIDE MARINE RADIOFACSIMILE
BROADCAST SCHEDULES
U.S. DEPARTMENT OF COMMERCE
NATIONAL OCEANIC and ATMOSPHERIC ADMINISTRATION
NATIONAL WEATHER SERVICE
April 12, 2024
https://www.weather.gov/media/marine/rfax.pdf
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