[R-390] Staggertuned IF Question

[Flowertime01 at wmconnect.com]

 I tried Roger's method of removing the 3rd 
mixer and injecting 455kc at the plate pin.  It took a LOT of signal to be 
able to hear it through the IF deck.  The crystal's trimmer and xfmr don't 
seem to peak like they should and it reqires me to crank the slugs in T501 
and T502 to the near limits to get them to peak.  Switching to AGC 
automatically gets me 20dB on the carrier level meter as opposed to zero in 
MGC.  I'm pretty sure I have work to do...

Barry - N4BUQ

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Barry, this does not sound good (Pun Intended).

Time to look at the crystal and the signal generator and freq counter. You 
may check the coupling cap you use for injection. It reads as if your frequency 
is off some where.  T501 and T502 should not change peak when you move back up 
the circuit chain and still inject 455. 

Why AGC gives you more than MGC I have no idea. That sounds like a problem of 
its own. We always expect that AGC has the gain off ground and thus less than 
MGC. 

Roger AI4NI