[AMRadio] Re: GB> 75A-2 project (sbjohnston@aol.com)


sbjohnston at aol.com sbjohnston at aol.com
Sat Jan 26 23:49:50 EST 2008


Thanks, Don - great ideas!

Steve WD8DAS

sbjohnston at aol.com
http://www.wd8das.net/
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-----Original Message-----
From: D. Chester <k4kyv at charter.net>
To: amradio at mailman.qth.net
Sent: Wed, 23 Jan 2008 8:42 pm
Subject: [AMRadio] Re: GB> 75A-2 project (sbjohnston at aol.com)









> It might be possible to "stagger tune" the IF stages to increase

> bandwidth.  Use of a sweep generator (or a manually swept signal

> generator) will let you know how you are doing when trying this.  As 
a

> general rule, you can trade gain and selectivity for increased

> bandwidth.  You might be able to get as much as a doubling of the IF

> bandwidth by this method.



Another approach might be to try overcoupling one or more of the i.f.
transformers.  This might be accomplished by physically moving the 
primary
and secondary coils closer to each other, if their mechanical 
configuration
permits.  Overcoupled tuned circuits tend to have a broader bandwidth 
with a
dip in the middle of the passband.  Combine this with a more loosely 
coupled
stage with a narrower peak that coincides with the dip, and the sum 
result
would be a broader and flatter passband with steeper skirts.


Don k4kyv

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