[R-390] Lankford AGC Mod ?

[DJED1@aol.com]

The only thing the diodes do is to shorten the attack time of the AVC to give 
the "fast attack, slow decay" AVC that we want for SSB.  On AM, the carrier 
is there all the time and the attack of the AVC does not have to be fast.  
Since all activity is at voice rates, the diodes do not have to be especially 
fast to perform satisfactorily.  I expect any good silicon diodes will do, as 
long as they have a high resistence when back biased.
Ed