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
>
> _______________________________________________
> 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
|