[K2] NB2 heard a "spark gap" like signal 8k lower than the RX frequency

Posted by Wayne Conrad on Aug 09, 2011; 3:01pm
URL: http://elecraft.85.s1.nabble.com/K2-NB2-heard-a-spark-gap-like-signal-8k-lower-than-the-RX-frequency-tp6668470.html

On my K2, in CW mode, and when I crank up the noise blanker by selecting
NB2 (and the default noise-blanker threshold, "Hi"), I sometimes hear a
strong signal some distance away from my receive frequency.  The signal
I hear, when this happens, is not a tone.  It's more like a spark-gap
buzz.  Today, when the receive frequency was 7.034, I heard a CQ on
7.026.  The signal on 7.026 was quite strong but otherwise sounded
normal.  FL1 (1.50) was selected.  AF2 is installed but was off.  If I
turned the noise blanker off, or select NB1, the interference goes
away.  It doesn't happen often, and is seldom strong enough to be a
problem, but it does make me wonder if something is out of whack, or if
I'm operating the radio improperly.  Is it just the nature of the
noise-blanker?

73, Wayne Conrad KF7QGA

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