Upper and/or Lower SSB Quest. ? And 2182 Quest. ?
All MHF and HF maritime SSB comm is USB. LSB has also been used for a certain
other type of service other than voice. It's been so long since I worked with
maritime stuff I don't recall what the other use is.
The most common MHF working frequency, after calling on 2182, is 2638.
Bill, K5BY
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