This is a forwarded message - please respond to Paul Christensen
<paulc@mediaone.net> directly or post on the Reflector - do not respond to
me.
Thanks,
Ed Guzis, W9TW
Tentec Mail Reflector Administrator
----------
From: Paul Christensen <paulc@mediaone.net>
Subject: Re: [TenTec] OMNI VI USB/LSB BFO's
To: <tentec@contesting.com>
Date: Friday, January 16, 1998 7:49 PM
Clark:
Mine does the same thing. I too tried to readjust the BFO board and was
back where I started. This is my second Omni Six with the same
characteristic: LSB receive audio is slightly richer in bass than USB.
I'm
not sure why though.
-Paul, W9AC
-----Original Message-----
From: Clark Savage Turner WA3JPG <turner@safety.ics.uci.edu>
To: tentec@contesting.com <tentec@contesting.com>
To: <tentec@contesting.com>
Date: Friday, January 16, 1998 8:25 PM
Subject: [TenTec] OMNI VI USB/LSB BFO's
>Howdy all:
>
>Just got my OMNI VI back from Ten Tec, and the option 3 upgrade is
>quite wonderful. I am finally impressed by DSP, it is not a miracle,
>but makes a real, live difference.
>
>I enjoy SSB a lot as well as CW. I like to have good audio reports
>and to hear signals with reasonable fidelity (well, with as much as
>I can get from a pair of 2.4 kHz filters, hi hi)
>
>Here's my question/problem: I listen to a dead band, switch from
>LSB to USB. The hiss sounds a lot different (shouldn't?) with the
>PBT centered. OK, I align the PBT, it was already right, dead on.
>It is the same. OK, I try to offset the PBT just a bit to make USB
>and LSB sound the same as I switch back and forth. It happens a
>little to the right of the center, but it is never really the same
>sound. LSB had much more "depth" of lows and USB had more "highs"
>no matter what I do.
>
>Well, I try fiddling with the BFO's. I can certainly bring the BFO
>into the passband at a different spot for USB and change things. I
>do that, I bring the USB BFO up to 9.00304 (.00004 higher than spec)
>and leave the LSB alone at 9.00000 . That makes some small difference
>(and on SSB transmit while I monitor on headphones, it seems to
>improve the audio), and the PBT can be close to center to get nearly
>the same sound, but when the PBT is turned (counterclockwise) for
>lower passband on LSB, I get more depth, but when I turn the PBT
>for lower passband on USB (clockwise) it just doesn't sound as
>deep to me.
>
>I am going to go read the ARRL 1996 handbook explanation of the
>way the OMNI works, but I am no engineer, so it may be rough
>going, hi hi.
>
>Anyone know what is going on? I am very curious. Am I missing
>something? My ears are quite sensitive, I have adjusted carrier
>oscillators by ear and come very, very close to specs on several
>rigs, so I figure I am hearing something here.
>
>Clark
>WA3JPG
--
FAQ on WWW: http://www.contesting.com/tentecfaq.htm
Submissions: tentec@contesting.com
Administrative requests: tentec-REQUEST@contesting.com
Problems: owner-tentec@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|