Re: filters and contests and interference question/opinions
Posted by
Don Wilhelm-4 on
Mar 25, 2012; 12:53pm
URL: http://elecraft.85.s1.nabble.com/filters-and-contests-and-interference-question-opinions-tp7403392p7403428.html
Don,
The DSP filters can deal with all the interference as long as it is not
overloaded - and overload is what the Hardware AGC prevents.
What I am saying is - turn Hi-Cut down so you have the equal of a 1.8 or
1.5 filter - then if you begin to hear the Hardware AGC pumping from the
nearby signals, you can conclude you need one of the narrow filters.
The DSP filters do not need any filtering help, they are quite good all
by themselves, but observe for AGC pumping, and if present under your
contest conditions, then the only cure is a more narrow roofing filter.
73,
Don W3FPR
On 3/25/2012 8:33 AM,
[hidden email] wrote:
> After spending time in two DX contasts this year and also dealing with
> lots of splatter from other stations during non contest conditions I
> find myself continually dialing down tighter and tighter filter settings
> on phone (ssb)
>
> Currently I have a 2.7, and 2.1 filter plus the narrow ones for digital.
>
> My brain is starting to tell me to stop using the 2.1 and get either a
> 1.8 or even a 1.5 or possibly both. My thoughts are that the dsp would
> work much better if some of the interference can be directly blocked out
> by the filter. These thoughts are guided by past readings on the list
> that this is the case.
>
> What is the collective wisdom of these filter changes I am thinking
> about. I am curious about others who may have tried these and if they
> kept them or if they thought it made no difference at all.
>
>
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