[TenTec] Argonaut II/Delta II crystal filters

[waltk8cv4612amos at att.net]

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" <mm0rkt at beeb.net>
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.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
> narrower.
>
> 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!
>
> 73
>
> Bob
> MM0RKT
> _______________________________________________
> TenTec mailing list
> TenTec at contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec