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

[Monty Shultes]

Does the noise go away if you disconnect the serial cable at the computer? 
If it does, the cable is poorly shielded/poorly grounded to the K3.

Good Luck - Monty, K2DLJ


> 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.