[Milsurplus] More Navy radio in China 1944 - 1945

[WA5CAB at cs.com]

Oops.  Sorry.  Finding the rated output power in the TBW manual is a pain, so 
I cheated and looked up the GO-9 (where it is on the front cover).  I often 
forget that they are only similar.

In a message dated 6/20/2005 12:16:39 PM Central Daylight Time, W7QHO at aol.com 
writes: 
> In a message dated 6/19/05 9:30:09 PM, WA5CAB at cs.com writes:
> 
> 
> >> Nope.  The TBW output on A2 was the same as on A3.  And MCW is less 
>> effective
>> through QRM or QRN than A1.
>> 
> 
> 
> Actually, the TBW is rated for equal output on A1 and A2.  In the MCW (A2) 
> mode, an 800 cycle modulating voltage is applied to the 803 PA tube suppressor 
> grid, but the grid is NOT negatively biased to provide for linear operation 
> as done in the A3 mode.  Also, in both A1 and A3 keying is done through the 
> primaries of the transformers providing the PA B+ and the 800 cps drive to 
> suppressor grid.  Don't know what the A2 output wave form looks like but must be 
> rough.
> 
> Agree, though, that A2 would still be less effective than A1.
> 

Robert Downs - Houston
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