[Milsurplus] BC-375

[W7QHO at aol.com]

In a message dated 6/1/2004 8:52:52 AM Eastern Daylight Time, linscot at rice.edu writes:

> On Tue, 1 Jun 2004 W7QHO at aol.com wrote:
> 
> >
> > Ron,
> >
> > To add to the comments you've already received.....
> >
> >
> > CW:  The amount of chirp with these sets is directly related to regulation of the HV supply.   They sound reasonably good running off a dynamotor.  My home-brew supply is only good for 10-15% and on CW the thing doesn't just chirp, it WHOOPS!
> >
> > Dennis D.  W7QHO
> > Glendale, CA
> >
> 
> According to Bob Keys, NA4G, on the Boatanchors list, if you adjust the
> T/R relay properly you won't have chirp. The manual explains how to set
> the contact timing so that the oscillator gets HV before the RF hits the
> antenna. The rig was designed with "differential keying", but many hams
> "improved" the keying circuit and signal quality suffered! 
>  Another
> argument for leaving the old rigs unmodified. :-)
> 

Proper timing of the T/R relay is important of course. In my experience, however, relay adjustment will not overcome poor PS regulation in regards to chirp.

Dennis D. W7QHO
Glendale, CA