[Elecraft] OT Hearing HRD Communicate w/K3

[Jim Brown]

On 3/18/2011 2:51 PM, Elecraft K3 wrote:
> I am experiencing a confounding problem with Ham Radio Deluxe, Digital Master 780 and my K3.  I've determined that HRD polling the K3 is introducing a croaking pulse-like noise into my signal chain.

I strongly suspect that HRD is NOT causing this problem, but rather a 
problem with either the computer or the K3 generating RF trash on the 
serial connection. This is not uncommon, and generally is the result of 
a Pin One problem at one or more of the data and/or audio ports. 
Virtually all computer sound cards and data ports have Pin One problems.

IF the trash is coupled by RF to the antenna(s), a SERIOUS multi-turn 
ferrite choke on the problematic cable(s) should help.  The choke should 
be tuned (by varying the number of turns) to cover the frequency range 
where you are hearing interference.

Study http://audiosystemsgroup.com/RFI-Ham.pdf

73, Jim K9YC