Good idea on the swamping resistors... I did confirm that mine did not
have the values for narrow bandwidth. Another list member pointed out
early and late-model 75A-2s had different bandwidth performance (early
favoring AM), so perhaps different values were used.
Steve WD8DAS
[EMAIL PROTECTED]
http://www.wd8das.net/
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-----Original Message-----
From: Glen Zook <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]; [email protected];
[EMAIL PROTECTED]
Sent: Tue, 22 Jan 2008 7:27 pm
Subject: Re: GB> 75A-2 project
To widen out the bandwidth you can put additional
fairly low value resistors across the i.f. cans. If
you look in the manual you will see a note to remove
the swamping resistors to narrow the bandwidth.
Therefore, adding resistors in parallel with the
existing resistors should broaden the bandwidth.
Glen, K9STH
--- [EMAIL PROTECTED] wrote:
The widest bandwidth is 4 kHz (crystal filter out,
just the tuned circuits in the IF stages) and I would
like to add the capability for a wider choice for
Hi-Fi AM reception. Anyone know of any articles on
such a modification? Maybe in the context of
"updating" the 75A-2 or 3 to mechanical filters? Or
have any of your own ideas?
Glen, K9STH
Website: http://k9sth.com
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