maritime

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Testing out the decoder last night and ran across this SITOR-B traffic about Typhoon Muifa. I believe this is USCG station NRV in Guam. Here’s some text:

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Excellent signals yesterday and today from two US Coast Guard cutters working off the California coast. USCGC Boutwell and USCGC Aspen both active in ANDVT and clear voice on 5693 kHz, also known as SVN Alpha. Not too often do we have clear comms on this frequency, so this is a real treat!

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4737.4 Warships?

Over the past year I have caught some interesting traffic on 4737.4 kHz USB. At first I didn’t pay much attention to this frequency, as the comms sounded quite casual in nature. It wasn’t until hearing them mention warships, then I started to take notice. In the clip below you will hear a station identified as “0301” calling “9701 Atlas” reporting they completed the AAV2 with Warship 69, and were now engaging with Warship 38.

I also logged this frequency last summer and heard phrases such as “Red Coast Guard” and “Red Territorial Waters”. The users refer to this as Tac 4 and also gave mention of VHF marine channels. Callsigns heard include: 0301, 0302, 9701 Atlas, Caw 1 and 120. Both times monitored was during daylight hours so probably coming from the offshore Southern California area. If anyone knows who they could be please advise.

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I monitored some odd sounding data bursts/scrambled voice on 8935 kHz in LSB mode this evening. Following the encoded message, a male voice could be heard reading letters phonetically. Hmmm…

Update 8/12/2010 – Better audio sample posted below. I have been informed these comms are possibly from a tuna fleet in the Pacific. I also monitored clear voice comms that further confirms this theory.

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Bangkok Meteorological Radio broadcasts Thailand maritime weather information on frequencies 6765.1 and 8743 kHz. This is one of the first stations I check for band openings in that part of the world. Below is a recording of their broadcast and interval signal on 8743 kHz.

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While most of the communications remain on VHF, there have been a few reports of activity on HF as well. Several people have reported hearing phone patches and fishermen discussing the BP oil spill on 8650 USB.

Another frequency to keep plugged in is 5320 USB. This is used by the US Coast Guard and was quite active last night and this morning. Reception here in California wasn’t all that great, but I did manage to snag a little audio.

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Stumbled across some OM’s with a very odd sounding dialect on 8225 kHz. I’m guessing they are fishermen. Any idea what language this could be?  

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The other night I stumbled across some interesting Chinese traffic on 13182 kHz. Plenty of chatter, music and telephone tones were heard while monitoring this frequency. A quick search on UDXF revealed this is used by XSQ Guangzhou Radio for maritime phone patches between vessels and mainland China.

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