[TenTec] Omni VI / +

[Steve Halliburton]

Yes, that was precisely the point I was making.  I tell the same
thing to people who complain that the Corsair (for example)
is "noisy".   Sometime back in 1963 or so I learned to run the
AF gain higher and the RF gain lower and have never looked
back.  That worked on my WW2 surplus receiver and it still
works now.

73
 Steve WA2SOC



Bob McGraw - K4TAX wrote:
> Simple, by reducing the RF gain for a given band and signal condition you 
> are improving the signal to noise ratio.  Thus it results in less for the 
> ears and brain to filter out.  The result is less fatigue.  Many folks 
> believe that the RF gain must be run at MAX to hear weak signals.  Quite the 
> contrary.  Above a certain point you simply increase the noise level along 
> with the signal.
>
> Part of the issue you describe is related to the attack and release of the 
> AGC system.  They are very different between the two radios.
>
> 73
> Bob, K4TAX
>
>
>
>
> ----- Original Message ----- 
> From: "Steve Halliburton" <wa2soc at hsix.com>
> To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
> Sent: Monday, April 06, 2009 7:11 AM
> Subject: Re: [TenTec] Omni VI / +
>
>
>   
>> My OMNI VI/3 exhibits "fatiguing" audio only when the RF
>> gain is too high.  Turn the RF gain up high and yes the audio
>> gets tiring in a hurry.  Turn the RF gain down to a sensible
>> level (I don't think mine has ever been above half-way) and
>> the audio sounds great.  This is only on CW that I'm talking
>> about since that's all I do with the radio.
>>
>> The only way I can describe the difference in audio is that it
>> sounds "hard" in the O6 when the RF gain is up too high.  It's
>> almost like every signal has a leading edge rise time that's too
>> short.  My Corsair doesn't sound like that no matter where
>> the controls are set, it's always a little "soft".  I put them
>> side-by-side last night to compare and the O6 sounds just
>> like the Corsair until I turn up the RF gain too high.
>>
>> The passband tuning affects this also.  If the PBT isn't set correctly,
>> the problem occurs more often.  On my O6 the PBT has to be
>> set just a little to the left of center to sound best on CW.  Filter
>> selection
>> and sidetone frequency affect the position.
>>
>> 73
>> Steve WA2SOC
>>
>>
>>
>> Andrew Moore wrote:
>>     
>>>>  I suspect there was something wrong
>>>> with your Omni, but I don't know what it might have been.
>>>>
>>>>         
>>> I don't think so -- I noticed it with both.  I'm not sure how much DSP or
>>> noise reduction happens in the VI+, or the quietness of the receiver
>>> compared to what I'm used to, but something about it just didn't agree 
>>> with
>>> my ears, and I wanted very badly to make it agree.  It wasn't bad by any
>>> means -- just subtle, but there.  It was more like the "signature" of the
>>> radio's audio than something specific.
>>> _______________________________________________
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>>>
>>>
>>>       
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>>     
>
>
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