[Elecraft] serial interface noise on 160m -- propagates through K3 to coax cables and grounds...

[Bill W4ZV]

Mitch Mitchell wrote:
> 
> Hello, 
> 
> I have been hearing an annoying noise on 160m that has a pulse rate of
> about 1/3 of a second.   After observing the behavior when I do certain
> things with my K3 and my computer I found that the source of the pulsing
> is Ham Radio Deluxe polling the K3 for VFO changes -- it polls every
> 300ms.  However, when HRD is shut down (no other serial port activity) the
> noise is still present as a constant tone with no pulsing effect.  
> 

FYI I recall a similar problem with the K2 on 160m, apparently caused by the
internal clock refresh rate (only when actively displaying time).  This was
under external battery power and no other devices connected.  I've never
heard similar problems in the K3.

73,  Bill

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