Dear All,
Having read and thought about this one since building in Feb last year
I 'attacked' the problem over the last two days. A survey with the
left side panel removed showed access was a bit tight and the run to
the grounding loop a bit long. So stripped the front panel right down
to the bare board. There is quite a ground land on the top side of
the PCB around the Mic socket. I acquired a fibreglass pencil from
Maplin and cleaned away a small area of solder resist in the outside
corner triangle of the PCB where "J2" is screen printed. This tinned
easily. An adjacent area of mic socket body was also tinned and then
a short length of stripped thick toroid wire was bent to shape and
soldered in. Another way to shorten the grounding link would be to
use a solder tag to one of the protective short stand-offs next to the
Mic socket.
The K2/100 twin is still working this morning!!
I suppose, if this or a similar mod proves satisfactory, at the next
PCB update, a through-plated hole and small pad could be created in
this corner to provide a more secure attachment?
73,
Ted G7BQM
K2#4732
On 8 Feb 2006, at 16:20, <[EMAIL PROTECTED]> wrote:
The mod is not difficult - remove the front panel and separate the
board
from the dress panel. Then wrap a bare wire around the threads of
the mic
connector, twist it tight, and run one end over to the ground loop
on the
left end of the board - solder the wire to the mic connector body
(requires
a LOT of heat - dwell with the iron until the connector body itself
melts
the solder) and solder the other end to the ground loop. Reassemble
the
front panel - Done.
The original write-up by Wayne N6KR should be somewhere in the
archives, I
believe back in 2000 or 2001.
I just did the mod on my K2's in an effort to remove RFI from the
audio. It is
much easier to just remove the left side panel. That gets you enough
access
to the mic connector and the ground loop without the trouble of
pulling the whole
front panel apart. I did not wrap the wire all the way around the
connector, just
soldering it seemed secure enough.
Torsten
N4OGW
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