It is most likely an aeronautical Non Directional Beacon.

These are found between 200 KHz up to about 450 KHz in many countries.


"Matthew and Wendy Plante" wrote in message
...
I'm new to this, so this may be a simple question. I found a transmitter
at
350 kHz at 1:45 Zulu that was transmitting "SW" in Morse. The mode was AM.
Any ideas? Is it a beacon? Thanks in Advance.
Mattew


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