Ron
----- Original Message ----
From: Thomas <ac7a@cox.net>
To: Discussion of Ten-Tec Equipment <tentec@contesting.com>; geraldj@weather.net
Sent: Fri, February 4, 2011 11:11:44 AM
Subject: Re: [TenTec] Eagle's audio is clean!
Hi Jerry,
One fellow suggested that could be a contributor. I am not a big DSP noise
reduction fan as I found it to be nearly useless with my Omni VI+; granted
that
was an early DSP application in amateur radio. Therefore, the original noise
issue I described with the Eagle was observed with noise reduction (NR) turned
off.
Thank you, Thomas
---- "Dr. Gerald N. Johnson" <geraldj@weather.net> wrote:
> The DSP noise blanker may be as susceptible to nearby strong signals as
> the hardware noise blanker.
>
> 73, Jerry, K0CQ
>
> On 2/4/2011 10:07 AM, Thomas wrote:
> > All,
> >
> > Thank you for your helpful responses. Indeed it appears that it is my
>unfamiliarity with a DSP-based radio that resulted in the CW-note noise and
>raspiness that I described yesterday. The DSP-based radio is a different bird
>than the mostly analog radios I've used the past 42 years.
> >
> > Here is what I learned about setting the Eagle audio:
> >
> > 1) Keep the RF gain, in the Eagle's case the IF gain, at a minimum. As the
>person responding said that prevents the ADC before the DSP from being
>overloaded. I should have know that, I work for a company that designs and
>manufactures ADCs. However, we in the trade always take it for granted that we
>usually won't be over driving the ADC input. Use the AF gain instead to
>control
>the volume. That is different than what I tended to do with my analog radios.
>Also, something very different about the Eagle's RF gain control is that
>setting
>it to minimum doesn't completely cut off the RF traveling through he signal
>chain. It has a very usable, sensible range. That had the greatest affect on
>the
>noise I described.
> >
> > 2) Use the attenuator. I found using the attenuator nicely reduces the
> > level
>at the front-end which of course further strengthens an already strong front
>end. That was key in the listening to the pile-ups. The Eagle has plenty of
>gain
>and I have always been a big fan of using an attenuator instead of the RF gain
>control. I usually ran my Omni VI+ with the attenuator on during the entire
>160m
>CW contests. I found it had little affect on the super weak DX stations and
>further helped attenuate the fellow a few miles away running serious power.
> >
> > 3) Keep the noise blanker turned off. I don't have the noise blanker
> > option,
>so that may not be applicable in this case. When I used my Omni VI+ I recall a
>a
>broad-band noise being generated over tens-of-kilohertz when a strong CW
>station was operating near by. As a rule I always kept it turned off. The
>Eagle
>has the DSP noise reduction which should be adequate for home use.
> >
> > There were other good tips as well and I will relate them as I learn the
>radio better. All I can really say for now is the Eagle is really cool! The
>ergonomics, size, and utility of the radio are perfectly suited for my uses.
>Wow.
> >
> > '73, Thomas - AC7A
> >
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> >
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