[Heathkit] SB-650

[email protected] [email protected]
Wed, 5 Mar 2003 16:00:07 -0500 

 Norm, when using the SB-650 you have to align the HFO
in the 303 to just shy of maximum. In fact, as high as you
can run it and still get reliable starting. In my SB-650 I also
removed the wire from the bottom of the input gain pot on
the HFO input and replaced it with a 3300 ohm resistor,
and cranked it full bore. Also make sure your using RG-62
cables. I use the SB-301, I don't know if the 303 may have a
lower HFO output or not.

Mark  WB8JKR


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