K3: interference on 50.313

[Edward R Cole]

Had a strange signal on 50.313 a couple days ago.  To memory it was
centered on 1500 Hz and about 1000-Hz wide.  I went about looking for
sources and disconnecting cables.  With all antenna connections
disconnected it was still there (oh bad).  But I also wondered if a
setting might have changed to produce it.  Recently a question about
setting up FT8 on the K3 had me going thru my settings so I rechecked
them.  Strangely clicking XFIL button cleared the display of the
interfering signal.

Hmm I said to myself, noting that button also controls DUAL
PB.  Could activating dual-PB in DATA-A mode produce this
"effect"?  Attempting to reproduce it with the XFIL/DUAL PB button
was unsuccessful (which is OK).  So this remains a mystery signal
(apparently internal to the K3)?

Experts any guesses on what it was?

73, Ed - KL7UW
   http://www.kl7uw.com
Dubus-NA Business mail:
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