"Matt J. McCullar" wrote in message
. net...
I'm hearing a strong digital signal of some sort when my radio is in CW
mode, on 4.005 MHz in north Texas during the evening hours. Sounds like
high-speed Morse code. I've done a web search with no luck, except that
Vatican Radio supposedly transmits on that frequency. Any idea what this
is
and where it's coming from?

Thanks!

Matt J. McCullar, KJ5BA
Arlington, TX

It is FSK (like RTTY). It is 850 Hz shift, 75 Baud.
It is s9+10 in southern California at 0400 UTC.
There are commercial and military signals
like this. Typically, if it is commercial,
the frequency will pop up if you google it.
Assuming you googled thoroughly, it is probably
military.
There are a dozen or more other stations like it
across the HF band (commercial and mil).
They aren't ASCII. They aren't Baudot.

--
rb