[TenTec] OMNI VI 2.8 INRAD filter for key clicks

[Paul Kraemer]

Barry
Try Bourns 3296Y family.  The 10k is 3296Y-1-103LF.  The second one is 
either 3296Y-1-101 (100 ohm) OR 3296Y-1-102LF (1k ohm).  Got them at DigiKey
Sorry for the ambiguity but the values in my radio (563 option 3) did not 
agree with one of my manuals so there is a couple each in my parts bin.
Important part is they are the triad lead pattern with top adjust and do 
drop right in on the board.  SIGNIFICANT TIP.  Remove old trimmer and 
measure where it is set and pre set the new one to that.  With the two 
adjustments and interaction it saves a LOT of fiddling.
Also good to note that about the best carrier suppression attainable (both 
sidebands) with the wide filter is 38 db.  Inrad makes note of that and 
having done two radios I would agree.

I'm also looking for better trimmer caps for the bfo adjusts as one of the 
radios I did the frequencies are always moving around a bit and with the 
wide filters a bit is a lot.  I have not put the radio on the bench and done 
any significant measurements as to where the drift is coming from.  Could be 
the crystals or ???

Anyway, long post short, I really love this radio now.  Looks, sound, the 
whole package and I get awesome audio reports from the other end.
What I started with turns out the original TT 2.4khz filter was really 
bonkers---passband shifted and a big hole in the middle of the voice range.

Lacking space for external speakers for everything I also replaced speaker 
with a "hi fi" driver from Parts Express that was a no modification fit and 
that gives more lows to the package.
I did not do the INRAD mod which moves the notch so it doesn't affect the lf 
response---I just park notch at the other end, the hf end.  Simple, problem 
solved.
Paul K0UYA

-----Original Message----- 
From: Barry N1EU
Sent: Tuesday, March 10, 2015 5:32 PM
To: Discussion of Ten-Tec Equipment
Subject: Re: [TenTec] OMNI VI 2.8 INRAD filter for key clicks

Paul, can you say more about those 10-turn trimmers?  Do you have a part
number and was it an exact drop-in fit?  You're absolutely right about it
being touchy but it's amazing how deep a null you can get if you're VERY
careful.

73, Barry N1EU

On Tue, Mar 10, 2015 at 8:49 PM, Paul Kraemer <elespe at lisco.com> wrote:

> Same experience here
> Installed the 2.8 INRAD filters and LOVE them for general ssb use
> However, you may also benefit from touching up the bfo frequencies and
> carrier null which it probably needs anyway as Barry mentioned.
> Also, with the wider filter the carrier null becomes more touchy to do.  I
> replaced the two pots with ten turn trimmers to make it easier.
> Paul K0UYA
>
> -----Original Message----- From: Barry N1EU
> Sent: Tuesday, March 10, 2015 8:43 AM
> To: Discussion of Ten-Tec Equipment
> Subject: Re: [TenTec] OMNI VI 2.8 INRAD filter for key clicks
>
>
> Not really true in my experience John.  The BFO oscillator alignment is
> exactly the same.  I believe the only step actually recommended was to
> touch up the carrier null adjustment, which is a very simple process that
> all Omni 6's could probably benefit from anyway, even if the filter wasn't
> changed.
>
> 73, Barry N1EU
>
> On Tue, Mar 10, 2015 at 9:17 AM, John Rippey <w3uls73 at gmail.com> wrote:
>
>  As I recall, installing the Inrad filter to fix key clicks in the OMNI 
> VIs
>> necessitated adjusting the front end's alignment to accommodate it. And
>> this, I perhaps recall incorrectly, made for other problems. I never did
>> it.
>>
>> 73,
>>
>> John, W3ULS
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