My MC-60 has bad RFI operating on 40 meters. I have done the usual jumpering of
pins 7 & 8 (PTT gnd and mic gnd) but did not help. It only shows up when I
touch a metal part on the mic. The best advice so far is to wear rubber
surgical gloves to operate on 40. OH I did try the ferrite on the coiled cord.
that did not help either.
What next?
Don N0DG

How well is your system grounded? I had the same problem a few
years ago, and re-doing my ground wires completely eliminated it.



On 4 Oct 2003 01:12:36 GMT, Dick Carroll wrote:

N0DG wrote:

My MC-60 has bad RFI operating on 40 meters. I have done the usual jumpering
of
pins 7 & 8 (PTT gnd and mic gnd) but did not help. It only shows up when I
touch a metal part on the mic. The best advice so far is to wear rubber
surgical gloves to operate on 40. OH I did try the ferrite on the coiled
cord.
that did not help either.
What next?
Don N0DG




Don, does it do this when you transmit on a dummy load? If not
I'd start looking for trouble in the antenna system. Maybe try a choke
balun at the feedpoint?

73, Dick W0EX

Ken Gunton WB6QWF ken att ohiomicrowave dottt commm
Ohio Microwave
Microwave and RF Components to 110 GHz
http://www.ohiomicrowave.com

How well is your system grounded? I had the same problem a few
years ago, and re-doing my ground wires completely eliminated it.



On 4 Oct 2003 01:12:36 GMT, Dick Carroll wrote:

N0DG wrote:

My MC-60 has bad RFI operating on 40 meters. I have done the usual jumpering
of
pins 7 & 8 (PTT gnd and mic gnd) but did not help. It only shows up when I
touch a metal part on the mic. The best advice so far is to wear rubber
surgical gloves to operate on 40. OH I did try the ferrite on the coiled
cord.
that did not help either.
What next?
Don N0DG




Don, does it do this when you transmit on a dummy load? If not
I'd start looking for trouble in the antenna system. Maybe try a choke
balun at the feedpoint?

73, Dick W0EX

Ken Gunton WB6QWF ken att ohiomicrowave dottt commm
Ohio Microwave
Microwave and RF Components to 110 GHz
http://www.ohiomicrowave.com

There was an article in QST within the past five years that
dealt with this problem and how to fix it - with cores and
caps at internal locations.

Bill Evans VE4UD
"N0DG" wrote in message
...
My MC-60 has bad RFI operating on 40 meters. I have done
the usual jumpering of
pins 7 & 8 (PTT gnd and mic gnd) but did not help. It
only shows up when I
touch a metal part on the mic. The best advice so far is
to wear rubber
surgical gloves to operate on 40. OH I did try the ferrite
on the coiled cord.
that did not help either.
What next?
Don N0DG

There was an article in QST within the past five years that
dealt with this problem and how to fix it - with cores and
caps at internal locations.

Bill Evans VE4UD
"N0DG" wrote in message
...
My MC-60 has bad RFI operating on 40 meters. I have done
the usual jumpering of
pins 7 & 8 (PTT gnd and mic gnd) but did not help. It
only shows up when I
touch a metal part on the mic. The best advice so far is
to wear rubber
surgical gloves to operate on 40. OH I did try the ferrite
on the coiled cord.
that did not help either.
What next?
Don N0DG