[Heathkit] HG-10 -VFO power supply, DX-60B

[Glen Zook]

There is just too much voltage swing between key up
and key down even if you increase the size of the
filter capacitors.  It doesn't take much of a power
supply to run the VFO and using it does make a whole
lot of difference.

As for the TR Switch:  Most of the circuits that were
in the various handbooks and magazines back in the
1950s and 1960s used a 6AH6 tube.  They do pretty much
isolate the receiver from the transmitter.  However,
they also tend to generate all sorts of harmonics and
do casue a lot of TVI.

I had one that I built around 1960 that I used with my
original DX-100 and Hallicrafters S-85.  Still have it
around somewhere.  But, I wouldn't think of using it
these days.

Glen, K9STH


--- KHeck73 at aol.com wrote:

Would it help to replace the filter caps in the DX-60B
 with a larger capacitance value to help stabilize
voltage to the VFO?
  
Also, this DX-60B has an electronic T-R switch
modification in  it. This involves an added tube, and
was described in a QST article. I  could never really
use the T-R switch, though, because the transmitter
signal  still got through to the receiver so strong it
was scary. Anybody familiar with  this modification?








Glen, K9STH

Web sites

http://home.comcast.net/~k9sth
http://home.comcast.net/~zcomco

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