Hi Fraser -
You are right about the different audio in the T-T rigs. The LSB on both my
Paragon II and my OMNI 6+ is much warmer than when changed to USB. There it
is thinner and sharper, which am sure you have already noted. It is the
filter slope, I believe. Your filter is not faulty. I have tried three of
them and the results are much the same.
See you do a bit SSB from your club. Hope to see you on CW as well.
73 - Don, ve1bn@eastlink.ca
----- Original Message -----
From: "Fraser Robertson" <g4bjm@hotmail.com>
To: <ken.d.brown@hawaiiantel.net>; "Discussion of Ten-Tec Equipment"
<tentec@contesting.com>
Sent: Monday, March 17, 2008 8:49 PM
Subject: Re: [TenTec] Omni VI Plus audio
Our club's Omni6+ option3 sounds very different on USB and LSB, and it's
not possible to correct it by adjusting the BFO frequencies, so it must be
down to the filter being asymetrical. I understood that was a common
failing, but perhaps our filter is faulty?
73 Fraser G4BJM
Date: Sun, 16 Mar 2008 18:37:51 -1000> From: ken.d.brown@hawaiiantel.net>
To: tentec@contesting.com> Subject: Re: [TenTec] Omni VI Plus audio> > >
> Now I don't know why the higher bands are different on your rig.> >
Wonder if you have an antenna problem? > >> > > If the SSB Receive (or
transmit) audio sounds different on 10, 15, 20 > meters than it does on
40, 75 meters, you should be comparing the sound > on USB versus LSB.
Your SSB audio characteristic should not change at > all due to changing
bands, other than because of the convention of using > USB above 9 MHz
and LSB below 9 MHz. The audio characteristics also > should not change
very much from USB to LSB. If it does change, that is > an indication
that your BFO frequencies are misaligned for one or both > SSB modes.
Another possibility, although not nearly as likely, is a > partially
failed crystal filter with a non-symmetrical passband shape. > The first
thing to do is check the BFO frequencies. If you install new
> filters, of any brand, without getting the BFO frequencies right, you >
will still have a problem.> > DE N6KB> >
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