just an update..the Microham Microkeyer II has definitely a problem
> with RF!
microKEYER II does not have a problem with RF. You must have an
exceptional problem with common mode RF on your feedline(s) and
that would impact *any* interface in the mic line.
> 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.
Unless your homebrew interface includes mic handling circuits with
a wide range preamp, your test in meaningless. Any change in cable
length can make significant differences in RFI as it moves the high
voltage point.
73,
... Joe, W4TV
On 2/15/2016 2:20 AM, bernhard.ho...@bmw.de wrote:
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 problemsare 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:li...@subich.com]
Gesendet: Freitag, 12. Februar 2016 14:15
An: elecraft@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, j...@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
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