[TenTec] Purpose of 250 Hz 8 pole filters

[Gary Hoffman]

Yes indeed on the fishing around !  I have seen that often.

In fact, no doubt I am one of the guilty !  <grin>  With both IF and DSP
filters cranked way way down, I won't hear stations calling even slightly
off.  This is true of PSK as well.

73 de Gary, AA2IZ


----- Original Message ----- 
From: <k8vf_mark at centurytel.net>
To: <tentec at contesting.com>
Sent: Sunday, October 21, 2007 8:58 PM
Subject: [TenTec] Purpose of 250 Hz 8 pole filters


> I cant do it. I envy you. I would think most can't, hence the filters.
>
> I would imagine you were the exception, in my opinion. What a great
talent!
> You are really lucky! If I could do that I would be thrilled!
> Lots of times in a contest there are several in the passband(500) and they
> are very close in frequency, so I really need the stacked filters in those
> condx.
>
> Yes noisy, not crowded band. Lots of noise on 160.
>
> The other reason for the narrow filter is to get EXACTLY on a guy....in
many
> contests, fellows are running very narrow filters and you have to "fish"
> around in the (even 250 Hz) passband to get a guy to answer you. I have
run
> into that many times...it is not the signal strength, either. The guys are
> just that narrow.
>
> Great thread!
>
> K8VF
>
>
>
>
> (snip)
> I regularly work a station when there are three, or more stations inside
> the 500 Hz bandwidth, and not necessarily the strongest of the three or
> more stations. If one or more of them is 10 or 20 dB above the rest,
> then I cannot work the weak ones. As long as all three stations are of
> moderate strength (probably less than S 5) and spaced by at least 100 Hz
> from each other, I have no difficulty focusing on whichever one I
> choose, and working it.
>
> If there is a lot of QRN, I find that my physiopsycoacoustic processing
> system works better with a 500 Hz last IF filter than with a 250 Hz one.
> > Dont forget to touch up the PBT as it MAY be different than the 500Hz
> > model.
> >
> Yep, definitely important.
>
> DE N6KB
>
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