Grant: I just checked mine and it appears to do the same thing. Setting up
the Main at LSB, BW=1800, PBT=0, and the same thing on the Sub, there is a
very noticeable difference. Tweaking the Sub PBT to +700 makes them sound
about the same.
Of course, I also get the 'swishing' noise with both receivers on since the
main and sub are about 6 Hz off on all bands as I have noted before. I sent
in my "wish list" from my web site to TT today and noted that problem along
with a suggestion that the offset be adjustable by a menu option.
----- Original Message -----
From: "Grant Youngman" <firstname.lastname@example.org>
To: "'Discussion of Ten-Tec Equipment'" <email@example.com>
Sent: Friday, February 24, 2006 7:59 PM
Subject: [TenTec] Another Possible O-II Issue
>I observed something pretty significant tonight while doing some
> between the Main and Sub receivers. I hadn't used the Sub on anything but
> AM since the II arrived. It's 2.030, resets done.
> Set up for a wide bandwith in LSB/USB (4-5Khz+), both radios seem to sound
> about the same. As the bandwidth is narrowed on the Sub receiver, I think
> there is a PBT shift (not reflected in the settings) taking place as well.
> For example, with both Main and Sub tuned to the same LSB signal at about
> 1.8 Khz bandwidth, I have to set the Sub's PBT to somewhere around +500 to
> match the response of the two receivers. I'm sure it's the Sub that's not
> working correctly because as you narrow the bandwidth you can hear the
> response get "tinny", as though PBT were sliding to cut the low end side
> the signal. The Main responds normally and just loses high frequencies as
> the bandwidth is narrowed.
> On USB, the situation is the same, except the Sub PBT has to be offset in
> the other direction by the same amount.
> Everything seems fine on the CW modes. As far as I can discern audibly,
> problem manifests only on SSB modes.
> I've checked and double checked, and all of the other parameters are set
> identically on the two radios.
> Has anyone else observed this odd behavior? Note to ditsbits in progress
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