Re: filters and contests and interference question/opinions
Posted by
Don Wilhelm-5 on
Mar 25, 2012; 2:24pm
URL: http://elecraft.85.s1.nabble.com/filters-and-contests-and-interference-question-opinions-tp7403392p7406397.html
Guy,
I will agree with you for CW - cascaded filters of approximately the
same width can be necessary.
However, the question had to do with SSB width filters, and there I
believe the answer is different.
73,
Don W3FPR
On 3/25/2012 10:05 AM, Guy Olinger K2AV wrote:
> a K3 with 8 pole
> roofing filter AND DSP set for skirt alignment. The DSP by itself is
> nowhere near the MP's selectivity, sorry. Not close.
>
> There is a point in CW contesting, where if you want to continue on a
> run frequency, you will have to be able to deal with a MUCH louder
> signal just a few hundred Hz up or down, and try to copy a MUCH weaker
> signal in band. And since the K3 is so clean in matters intermod, it
> really IS possible to deal with a 35 over 9 signal just up and copy an
> S1 signal in band, a mere 80 dB difference. IF you also want the
> desired signal to be 20 dB louder than the undesired signal in the
> audio, you are trying to create a separation of 100 dB !!
>
>
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