[Milsurplus] 803 circuits

[WA5CAB at cs.com]

I survived a more or less 2650 VDC hit in 1962.  BC-610 with an open 
bleeder resistor.  48 years later I still remember that I hurt all over when I 
woke up out in the passageway.

In a message dated 11/17/2010 11:11:47 PM Central Standard Time, 
arc5 at ix.netcom.com writes: 
> I simplified the circuit of the AVT-12 transmitter:
> 
> http://home.netcom.com/~arc5/AVT12a.jpg
> 
> It uses the large format RCA crystals.
> Don't know if your little HC-25s or FT-243s
> will hold up. The RFCs are like the ones
> used in ART-13s.
> The 803 suppressor is modulated at 50 volts
> through the secondary of the modulator output transformer.
> That voltage is developed by taking it off the top of
> a honking-big 750 Ohm, 75 Watt resistor in the B- lead.
> Whatever they gained in a smaller mod transformer,
> they wasted in those two big 75-watt dropping resistors
> for the screen and modulator, not to mention the 
> huge ones in the dynamotor chassis to divide down
> to Osc. B+.  I still don't see the advantage
> of running Kamikaze B+ just to burn it off 
> in King Kong voltage dividers.
> If I ever get a chance to put an 803-like rig on the air,
> it will be a serious candidate 
> for reduced B+ experimentation.  
> I'm too old, clumsy and forgetful to be twiddling 
> around 2000 volts. I've lived over many 
> 3 or 400 volt shocks, but 2000 volts is instant death.
> No thanks.
> 73 Dave S.
> 

Robert & Susan Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480