[Elecraft] Microham Microkeyer II, RFI in mike with my K3

[Bernhard.Horst at bmw.de]

Dear all,

just an update..the Microham Microkeyer II has definitely a problem with RF!
I replaced the Microkeyer with a homebrew USB and soundcard interface (Built in 2008) and made new cable distribution box..And the problems are gone.

I have S-NO 280 on the microkeyer..hope the newer ones are better. But definitely not my kind of solution for that cost!

73s
Bernie
DL5RDP

-----Ursprüngliche Nachricht-----
Von: Joe Subich, W4TV [mailto:lists at subich.com] 
Gesendet: Freitag, 12. Februar 2016 14:15
An: elecraft at mailman.qth.net
Betreff: Re: [Elecraft] Microham Microkeyer II, RFI in mike with my K3


> As I recall, I used pin 7 for the mic ground and pin 8 for the PTT
> ground. In a brief test it worked ok into a dummy load. Is this not
> correct?

That is correct although with the K3/K3S since the Elecraft mic RFI
change it should not matter (both pin 7 and pin 8 are connected to
the "ground" foil on the front panel circuit board).

Early K3 front panels included an RF choke in the mic *and* PTT returns
which made the "pin 1 problem" much worse.  With the RF choke removed
(bypassed) the issue is significantly reduced but there may still be a
problem if the overall station installation has any "RF on the coax."

73,

   ... Joe, W4TV


On 2/12/2016 7:59 AM, john at kk9a.com wrote:
> This week I wired rewired my MicroHAM Micro2R cables for K3S's.  As I
> recall, I used pin 7 for the mic ground and pin 8 for the PTT ground. In a
> brief test it worked ok into a dummy load. Is this not correct?
>
> John KK9A
>