[TenTec] Eagle's audio is clean!

[Ron]

 Ron



----- Original Message ----
From: Thomas <ac7a at cox.net>
To: Discussion of Ten-Tec Equipment <tentec at contesting.com>; geraldj at 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 at 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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