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[TenTec] My odd Omni 6+ Autocorrect typos fixed

To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Subject: [TenTec] My odd Omni 6+ Autocorrect typos fixed
From: Gary J FollettDukes HiFi <dukeshifi@comcast.net>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Sun, 10 Jan 2016 00:26:18 -0600
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
It would seem to me that the best use of the Inrad wide filter would be to 
leave the original filter in position one in the first IF. The you could easily 
move a few wires to bypass that filter in receive, and go directly to the 2.8 
KHz filter in position 2. This is easy because, in the Omni 6, TenTec cascaded 
the first filter into the second one. If you use the PIN diodes to go around 
the position one filter (2.4 KHz) you would take full advantage of the wider 
filter in position two only in receive. In transmit, everything would remain 
stock.

Omni 6 radios never sounded all that bad in transmit, only in receive (to my 
ears anyway). The above method should improve that sound by quite a bit.

BTW: I never observed any significant improvement in Omni 6 audio on receive 
with the so-called audio improvement mod. I have tried it on several Omni 6’s 
and never saw much difference.

I believe the filters in the Omni 6 have more in band ripple than they should, 
and also the positioning of the first IF filter with respect to the second IF 
filter combines to produce the nasal sound of the omni 6 (non-optimal overlap). 
No amount of audio chain alteration will correct for that.

I have even taken the audio directly from the product detector and passed this 
through to an outboard audio amplifier. No real improvement in audio was 
observed.

This supports the notion that the restricted audio arises in the IF combination 
of filters and their respective center frequencies and overlap.

The only other place where such restricted frequency response could take place 
is in the very first ceramic filter that is used prior to any of the 9 MHz 
roofing filters. I have never tried bypassing this just to see what impact it 
has on the audio response. I will wait for that until I see how the filter 
arrangement in this particular Omni 6+ sounds.


I can’t wait to hear how this Omni sounds tomorrow with the high buck 3.1 KHz 
filters in both IF’s. I have high hopes...

Gary
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