[R-390] R-390a question

[Tony Casorso]

Hi everyone,

I have a question about MGC vs AGC mode. On my R-390a there is a substantial 
jump in gain when switching from AGC to MGC while I am tuned to nothing but 
atmospheric noise. I measured it with the line meter and the jump is about 
12db. I also measured the AGC terminal on the back of the set and the AGC 
sits at -1.8 volts in the AGC position with the same signal. In MGC the AGC 
voltage goes to zero.

Does this sound right? The reason I ask is that I have noticed that weak 
stations are easier to copy in the MGC mode. I thought the AGC delay was 
supposed to prevent this. Maybe the Lankford SSB mod (2 diodes) affects 
this?

Thanks,

Tony