Hi,
Thank you very much! The clue, is of course the AGC... Once switched off,
the easy peaking of the band pass filters returns!
Regards
Nicolas
www.m1hog.com
-----Original Message-----
From: Tom Hammond [mailto:
[hidden email]]
Sent: 19 July 2004 14:17
To:
[hidden email]
Subject: Re: [Elecraft] RE: 4039 - Bandpass filters?
Hi Nicholas:
>During the course of this final alignment I worked through the set up
>procedure for the band pass filters again, using the small broadband noise
>generator I have built (Thanks N0SS). But I just did not seem to get the
>same easy "peaks" esp. on the lower bands, that I did when I first aligned
>it on 40m etc as an RX only (Prior to fitting the SSB board, TX, etc).
>
>Is something wrong?
Probably not... as long as the sensitivity appears to still be good. Try
removing the KBS2 and replacing it with the two capacitors (which were
previously removed) plugged into the headers. If there's a marked
difference in sensitivity, then there probably IS a problem, otherwise,
probably not.
Double-check the peaks, and use band noise for the peaking, rather than the
noise generator... it usually will provide MUCH more than the required RF
levels and will usually 'swamp' (overload) the AGC (if it's turned on).
The noise generator was really intended for use with adjusting the xtal
filters, rather than fine-tuning the BPF, which requires low signal levels
and good hearing.
Cheers,
Tom N0SS
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