[Heathkit] HW-100/101 het osc output

[Edward B Richards]

Dick;

The reason for the specified voltages is to ensure the oscillator is on
the slow side of peak. If set for more than -2V it may drop out of
oscillation. Later in the alignment procedure it calls for peaking the
heterodyne crystals.

Things that may cause low power, won't peak are:
Bad 6146's. Try a new pair.
Low voltage.
Bias set wrong.
Loading capacitor set wrong.
Load not 50 ohms.
Driver tube weak.
Many other things.

Ed   K6UUZ

 
On Wed, 25 Nov 2009 14:56:10 -0500 "Dick KF4NS" <kf4nsradio at verizon.net>
writes:
> My HW100 is giving me some fits with the alignment for the first time 
> 
> in the 39 years I have used it. Usually all goes just as smooth as 
> baby's rear. First thing I noticed is that I cannot dip the plate on 
> 
> 80M, close but not a dip.I decided to just start over.
> 
> The het osc setting is first of course. I am curious why the 
> Heathkit 
> specs state that it is supposed to be set between -0.5VDC and 
> -2.0VDC. 
> I can easily set mine between 0 and -7.4V. Why such a wide range? 
> What 
> if it is set for more than -2V?
> 
> The actual problem is low power output on all bands and after a full 
> 
> alignment and neutralizing the finals with a scope, I went back to 
> square one as mentioned above. Any ideas come to mind other than 
> swapping the finals? Guess maybe I should compare cathode and plate 
> 
> current but that is a pain to do.
> 
> 73, Dick KF4NS
> St Petersburg, FL 33714 USA
> Keep The Glow! 
> 
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