[Milsurplus] [BoatAnchors] BC-654/PE-104/BA-43 confusion.

mac w7qho at aol.com
Thu May 9 21:30:42 EDT 2013


John,

Trace the connection from Pin 7 over to the receiver and you will see  
it runs through a 560 ohm resistor to the -1.5V filament line.  The  
receiver B- return current flowing through this resistor (added to the  
-1.5v filament supply) provides the negative bias required by the  
receiver audio and AVC circuits.

Dennis D.  W7QHO
Glendale, CA

****************
On May 8, 2013, at 10:11 PM, John McCarty wrote:

> Then I see a small diagram for the
> BA-43 in the bottom of the page and it has the return for the -51  
> volts on pin 2
> and the return for the B+ (-90v) on pin 7, which are tied together  
> and become the
> negative bias for the RX. How does this work???



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