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[ct-user] Re: DVP hum with Kenwood ?

To: <ct-user@contesting.com>
Subject: [ct-user] Re: DVP hum with Kenwood ?
From: Wilbert Knol" <w.knol@niwa.cri.nz (Wilbert Knol)
Date: Tue, 14 Oct 1997 09:32:15 1300
We had a similar problem at ZM2K with a TS930.

With that rig, the shield on the mike input circuit is quite 
seperate from the rig chassis. The latter is also the headhones audio 
return path.

If you run your boom mike headset through a box (voice keyer or 
otherwise) where the two are tied together, you will have hum on 
transmit.

The trick is not to try and re-design the Kenwood radio by connecting 
the mike shield to the rig chassis. Keep them separate. If your voice 
machine won't let you, consider using an audio isolating transformer 
between the voice keyer and the mike input socket.

Even easier: use CW :-)

Wilbert, ZL2BSJ

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