[Milsurplus] TBW Key Clicks/ Chirps

[W7QHO at aol.com]

In a message dated 2/3/06 5:52:56 PM, rbrunner at gis.net writes:


> Dennis, what are you using for the 800 cycles?  This sounds like the
> generator-reactance-series-capacitance problem.  If the GP-7 has the
> series capacitor built-in, like in the TBW and GO-9, the real load
> terminal voltage appears at the inside end of the capacitor, and the
> feedback voltage regulating connection must be made there.  If the
> series capacitor is not right, the key-down voltage may go up or down,
> with dramatic results.
> 
> 
Richard,

I have an original TBW 115/230 vac, 60 cps to 115vac 800cps MG set 
(CDO-21648).   I adjust the compensating cap values in the GP-7 according to the book, 
i.e., for minimum voltage deviation between key down and key up as measured at 
the output of the filament xformer.    The GP-7 is an MOPA rig, BTW, unlike 
the TBW.   

Don't know what you mean by "feedback voltage regulating connection."   Only 
connection between the generator and the rig are the power lines.   

Dennis D. W7QHO
Glendale, CA