[R-390] CV-591

[Drew Papanek]

Jim Brannigan wrote:

<snipped>

>This is the first time that I used the Eldico SBA-1 with the R-390A and it
>is interesting.  The SBA-1 has crystal controlled oscillators and a crystal
>filter, so the R-390A must be run wide open (8 or 16MC. filter).

Jim,

With R-390A bandwidth wide open it is possible for strong signals within 
R-390A passband but outside of Eldico passband to desense the R-390A via AGC 
action (if R-390A generated AGC is enabled) or R-390A IFoverload (if AGC is 
taken from Eldico and fed back to R-390A).

You could close up R-390A's banwidth and hope that Eldico crystal filter and 
applicable R-390A "mechanism a philharmonic" (mechanical filter) center 
frequencies match (in contradiction of Murphy's Law).

You could bypass Eldico's crystal filter and change detector injection 
frequencies  (crystal swap-a pain).

If Eldico has enough gain, you could tap R-390A IF ahead of filters and feed 
to Eldico (involves mod to R-390A).

Drew

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