Re: [TenTec] Another Possible O-II Issue

["Ron Castro" <ronc@sonic.net>]

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.
Ron
N6AHA


----- Original Message ----- 
From: "Grant Youngman" <nq5t@comcast.net>
To: "'Discussion of Ten-Tec Equipment'" <tentec@contesting.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 
> 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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