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@hsix.com>
To: "Discussion of Ten-Tec Equipment" <tentec@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.
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
|