With normal component values, and 7.8 V on 8A, you will get 3.72 V max at
U2B pin 5, so you've done everything right.  Even with 8.0 V on 8A,
you shouldn't get more than 3.82 V at U2B pin 5 with RF gain set full
clockwise.  (The manual calls for 3.8 Volts there, not 3.9)


--I did find one other thing that doesn't seem quite right.  I'm having
--some trouble with the AGC circuit, and adjusting R1 on the control  
--board.  It says to adjust R1 to see about 3.9 volts on pin 5 of U2,  
--but I can't get any more than 3.7 volts.
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