[TenTec] OMNI V Carrier Balance Adjustment Procedure

[David Drake]

Hi Al,
Yes the name and call are in my memory banks.  Well, as you said, all 
the TT rigs are excellent CW rigs.....possibly the best ever made, or at 
least in recent times.  However, the game today seems to be "high fi 
audio" and "contest grade weak signal performance".  As you know, most 
of the new rigs like the Jupiter and Orion have transmit audio DSP 
options that can go over 3kc.  While I see little value in going that 
high, many people I have talked to say the stock TT 2.4's are more 
restricted than most other rigs....possibly to limit adjacent channel 
interference.....by design with steep slopes in the first IF.  While 
sharp selectivity is not normally a bad thing, the SSB audio is more 
restricted than other rigs which are designed more for SSB than a TT. 
How we sound to each other is always very personal and we all like to 
sound good to our peers.

The second issue of weak signal performance requires three things.  High 
sensitivity, low noise and the ability to reject adjacent channel 
activity (through greater selectivity).
Also, we now have a new term to learn:  "The Roofing Filter".  Well, as 
I understand this new term, its really the first filter stage in a 
receiver......or.....the first IF.  From my discussions with others, the 
wider first IF filter from Inrad helps in two ways, 1)lets in more of 
the signal and 2) makes for a quieter IF.  Regarding the later, I'm not 
sure how this works or the theory involved, but they say it works.  In 
addition, the quality of the filter and number of poles can also affect 
the receipt of the incoming signal.  I can also attest to this:  I owned 
a Corsair that came stock with the 4 pole filer.  I replaced it with the 
optional 8 pole.  What a difference!!  So here we obviously have an 
issue of the amount of filtering (number of poles) and possibly the 
quality of the filter (or both combined).

So, to sum up a long winded response, 1) Hopefully a quieter receiver 
that will be better at weak signal reception and 2) Improved fidelity of 
transmit audio.  Now we can use those Heil mikes to their potential!!!

Now, I may get brow beaten and dragged over the coals for advocating a 
non-TT accessory, but we hams just have to try new things once in a 
while.  I also may have this "roofing filter" business wrong or have 
compared it to our old first IF wrong, and if so apologize if I am 
incorrect in my assumptions.

Anyway, If it works as I have outlined, success is golden.  If it 
doesn't work, we all need to understand why and learn from the 
experience.  That's really why we have these reflectors!

David Drake, Wd9cmd

----- Original Message ----- 
From: "Al Parker" <anchor at ec.rr.com>
To: <drake at fullnet.com>; <tentec at mailman.qth.net>
Sent: Friday, September 24, 2004 11:54 AM
Subject: Re: [TenTec] OMNI V Carrier Balance Adjustment Procedure


> Hi David,
>    I think we've corresponded re: Drake (radios) in the past.  I'm 
> also a
> TenTec devotee, having owned at least 1 continually since the 
> mid-70's.  I
> must admit that lately I haven't kept myself refreshed on what's what
> inside, I just use my Omni-V as the "go to" rig when I don't want to 
> mess
> with some of the boatanchors, and want to get thru with the least 
> hassle.
> So, I'll add to this thread, and maybe help keep the list active -- 
>    I'd be interested in your reasons for, and results of, the INrad 
> 2.8kc
> filter installation, vs what's in there now.  My operating habits have
> changed in the past 10 yrs, don't contest anymore, don't get on CW 
> nearly
> as much as I used to or ought to.  My original reasons for TenTec were 
> for
> CW operation, the good general specs, the terrific full break-in, 
> which
> was almost unheard of back in the '70's, and the simplicity of 
> operation.
> 73,
> Al, W8UT
> New Bern, NC
> BoatAnchors appreciated here
> http://www.thecompendium.net/radio/
> http://www.hammarlund.info
>
>
> ----- Original Message ----- 
> From: "David Drake" <drake at fullnet.com>
> To: <tentec at mailman.qth.net>
> Sent: Friday, September 24, 2004 11:37 AM
> Subject: [TenTec] OMNI V Carrier Balance Adjustment Procedure
>
>
>> Good Day to the Group,
>>
>> Just received a new 2.8 inrad for the first IF in my Omni V.
>> snip >
>> Also, its things like this that should/could be posted to an 
>> independent
>> Ten Tec Web Site to share for the benefit of all.
>>
>> Thanks, David, Wd9cmd
>> "All American Made: Ten Tec, Drake, Collins"
>>
>
>
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