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.
----- Original Message -----
From: "Steve Halliburton" <firstname.lastname@example.org>
To: "Discussion of Ten-Tec Equipment" <email@example.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
> and sidetone frequency affect the position.
> 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
>> 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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