[Heathkit] SB-650

normwolfe [email protected]
Wed, 05 Mar 2003 12:21:23 -0600


Gentelmen:

I need help.  I am trying to make an SB-650 work with the SB-401 and
SB-303 receiver.  When I go to initial tests it shows proper set-up,
when I go to calibrate, it works great on 3.5, 7.0, 14.0, and 15.0 Mhz.
On 21 Mhz the 21Mhz if correct and it is random on the rest of the
digits.  On 28.0, 28.5, 29.0 ad 29.5 Mhz I can not get the adjust out of
the HFO that I need.  By cranking the HFO pot full up and twiking it a
little I can get it to read 29 on the Mhz side but the rest of the
digits are random rapidly.  Without changing anything if I go to 29.0,
28.5, or 21.0 Mhz it reads any thing from 11 to 16 Mhz.

I have gone back into the Receiver and re-alligned it and found nothing
wrong in the allignment.  I realligned the Heterodyne Oscillator board,
Antenna board and the RF Amplifier board.  This has made no change at
all.  My problem appears to be in the HFO adjustment of the SB-650.

Can anyone shed light on this.

Thanks
Norm