[TimeWave-AEA] pk232-pro756 hum

[Bill Riches]

I am using an icom 756 pro - pk232mbx and desktop computer with pkterm 99
for windoze.

Rx is ok - tx has hum caused by ground loop - when system is transmitting
into a dummy load and monitoring on nrd rx there is about a 25% hum as
compared with the data audio.  If I disconnect db25 from pk232 hum goes
away - touching the shell of the db25 to the cabinet of the pk232 the hum
comes back.  ie ground loop!!  As you know the 756 has a separate mike
ground return from the keying and rx audio grounds.  Any suggestions on
geting rid of the hum?

Regards,

Bill Riches, WA2DVU