The sub sounds tinny because of the PBT differences. This has always been
the case, even with the Orion I. There is a difference on how the filters
are set in the passband with the sub-receiver. You can make it match by
adjusting PBT on the sub-receiver.
With PBT at 0, and in SSB, the main receiver always has the bottom of each
filter set at 200 hertz. The Sub-receiver sets this to a higher value.
Carl Moreschi N4PY
Hays, North Carolina
----- Original Message -----
From: "John Nason / NA9U" <firstname.lastname@example.org>
To: "Discussion of Ten-Tec Equipment" <email@example.com>
Sent: Saturday, February 25, 2006 7:52 AM
Subject: Re: [TenTec] Another Possible O-II Issue
> I'll check that out. Along the same lines though I
> notice my two recievers dont' sound about the same.
> My main sound bassey and my sub sounds tinny. Anyone
> John NA9U
> --- Grant Youngman <firstname.lastname@example.org> wrote:
> > I observed something pretty significant tonight
> > while doing some comparisons
> > 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 of
> > 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, the
> > 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
> > ....
> > Grant/NQ5T
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