[Elecraft] K3 and Heil Proset

[Don Wilhelm]

The best way to determine if a problem is or is not produced by RF 
Feedback is to operate with the transmitter working into a dummy load.  
If the problem goes away, there is a 99% chance it is RFI.
This comment is not confined to the K3 or any other Elecraft gear, it 
can be any transmitter.

IMHO, the proper place to cure RFI is in the antenna system.  Try common 
mode chokes on the feedline(s) - in addition to the antenna feedpoint, 
they are often needed at the point of shack entry.

73,
Don W3FPR

On 9/20/2014 9:29 AM, Mike Goldstein wrote:
> I've had a few responses to my earlier query re using the Heil Proset 
> iC with the K3, others who have had similar problems - you are not alone!
>
> Here is my original post:
>
> "Using the K3, has anyone else had problems with the Heil Proset 
> supplied by Elecraft (model iC) as to audio feedback on VOX, very 
> sensitive controls of VOX gain and Mic gain, etc. etc?
>
>
> These problems can be masked as RFI, but adding toroids on the cable 
> has little effect. No other microphones seem to have these problems"
>
> Note that the Elecraft mobile mic. also has an electret cartridge, but 
> I usually use PTT with it, and would not notice VOX problems.
>
>
> I've wrestled with this for 6 years, and finally decided to beat it. I 
> had the same problems on my Kenwood TS590, with this headset.
>
> My solution was to buy a Heil Proset 6, with the HC6 cartridge, a 
> cartridge with much, much lower output. In the past couple of days, 
> I've tested it on the K3 and my Kenwood TS590 ... works a treat, and 
> nooooooooo problems!
>