[Drake] TR-7 PTO Drift

[Tom Evans]

Dave,

I found a 5 watt 110 volt heater and placed it under the TR-7.  It
reduced the drift considerably, particularly in the wintertime.

Before you replace the PTO, search for "TR-7 PTO stabilizer".  For example,
http://home.wanadoo.nl/cmulder/drake.htm#bookmark3
describes an add-on circuit which will reduce the drift to about 20 Hz.

Tom, AG9X


On 9/8/05, Wa1cvn at aol.com <Wa1cvn at aol.com> wrote:
> Hi All,
> I have accumulated a couple of TR-7 PTO's the have unacceptable  drift.  Does
> anyone have experience in replacing the temperature  compensating capacitors,
> or replacing the complete board with a C-line PTO  board?  Any help would be
> appreciated.
> 
> Dave
> WA1CVN