I am not a SSB fancier so not very familiar with that adjustment but setting
the IF BANDWIDTH narrower you need to ALSO adjust the PBT for best audio!
In CW which I operate mostly I have found for the tone I listen to ( about
700 Hz ) I set the PBT about 10 O'clock and the IF BW also around 10 O'clock
and only more counter clock wise if really needed.
Hope this helps? I don't think you will get more or better selectivity out
of that Jones filter adjusting it internally, it is a COMPROMISE filter. One
filter doing EVERYTHING POORLY ! The plus side is you didn't have to spent a
$1000 lbs on filters like a FT-1000 MP rig. You can't have your cake and eat
it too :-)
Bottom line, the filter stinks ! How about the display back light? Is it
still working ? Have you done the AGC mod ? The AGC mod may not be needed if
you only operate SSB but sure helped for CW !
Bottom line, TenTec dropped the Jones filter as it was a failure. Elecraft
uses it and has had success with it, to say the least!
Walt K8CV Royal Oak, MI.
----- Original Message -----
From: "Bob Towers" <firstname.lastname@example.org>
To: "Discussion of Ten-Tec Equipment" <email@example.com>
Sent: Wednesday, August 01, 2007 6:14 AM
Subject: [TenTec] Argonaut II/Delta II crystal filters
> I'm not exactly happy with the Jones filter on my Argonaut II.
> a) the centre of the bandpass shifts up frequency (on USB) when I
> tighten the bandpass width
> b) the narrowest width setting is about 700Hz: I could do with 500Hz or
> The manual warns against adjusting the two sets of 4-pole filters unless
> you have a network (spectrum, surely?) analyser, which I do. Anyway, the
> adjustment pots are all locked in position with some sort of fixative.
> Has anyone had a go at adjusting the filters?
> If so, I would appreciate some advice - which might be, of course, don't
> try and fix it!
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