[R-390] Staggertuned IF Question

[Cecil Acuff]

I'm working from memory here so YMMV....(your memory may vary)

My thoughts are NO.  As I remember there is a capacitor involved on each can 
that sets the Q for the coil...I can't remember if the cap needs to be there 
when you are to stagger tune or vice versa....

Seems the cap reduces the Q allowing a smooth bandpass when stagger tuned 
where without the cap it's too peaky....

Roger you will have to fill in the blanks on my memory cell issue on this 
one...

I know the R-390/URR is straight tuned but I've heard the "A's" are 
split...some setup for stagger tuning, some not.  I've heard also of folks 
cutting out the caps and straight tuning but I'm not sure there are not 
stage gain problems with doing that...

Good subject though...

Cecil...
----- Original Message ----- 
From: <n4buq at knology.net>
To: <R-390 at mailman.qth.net>
Sent: Thursday, September 14, 2006 9:03 AM
Subject: [R-390] Staggertuned IF Question


> Are all IF modules capable of stagger-tuning?  I started trying this with
> my current project with no results.  The IF won't even think about hearing
> a 467kc signal.  I was able to do this on my Motorola, but not this one.
>
> I seem to recall reading where not all IF modules were designed to
> accomodate stagger-tuning.  Is this true?  If not, then I suppose I have
> more work to do.  If so, then do I assume I peak all the slugs for 455kc?
>
> Thanks,
>
> Barry - N4BUQ
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