[Elecraft] DESK MICROPHONES FOR K3

[Jim Brown]

On 7/8/2014 4:17 AM, Nate Bargmann wrote:
> The MC-60 does have some known RFI issues.  Evne though I've tamed mine
> considerably (see http://highfields-arc.co.uk/repairs/mc60.htm ) it
> still will exihibit RFI every now and then on 75m.  So long as I don't
> hold the mic in both hands (while leaning back in the chair) everything
> seems fine.

Yes, if you study the text of this link, you will note that it comes 
with a Pin One Problem -- the cable shields are not connected to the 
chassis, but instead go to "audio ground" and "PTT ground". This is a 
classic Pin One Problem, and almost guaranteed to cause RFI. Early K3s 
were also built this way, but I believe that's been fixed.

The FT1000MPs I owned (and sold to buy K3s) also had a Pin One Problem 
at the mic connector that caused RF feedback on 75M and 15M.

The ONLY proper connection of a cable shield is the CHASSIS.

73, Jim K9YC

73, Jim K9YC