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5 pole vs. 8 pole filters

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aa4nc

5 pole vs. 8 pole filters

After operating a few contests with my K3, I think I may need to upgrade roofing filters, especially on SSB. I have the stock 2.7 and the 5 pole 500Hz CW installed now.

Can anyone comment on the real world contest performance of the 8 pole vs. the 5 pole filters? On SSB with the width dialed in to 1.8-2.0 Khz, I have stations at S9 and above that are easily copyable at over 4 Khz wide which makes it tough on a crowded phone band.

I'm told that the Inrad supplies the filters to Elecraft, so is there really only one filter source?

Thanks,

Will

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Vic K2VCO

Re: 5 pole vs. 8 pole filters

[hidden email] wrote:
> After operating a few contests with my K3, I think I may need to upgrade roofing
> filters, especially on SSB. I have the stock 2.7 and the 5 pole 500Hz CW installed now.
>
> Can anyone comment on the real world contest performance of the 8 pole vs. the 5 pole
> filters? On SSB with the width dialed in to 1.8-2.0 Khz, I have stations at S9 and
> above that are easily copyable at over 4 Khz wide which makes it tough on a crowded
> phone band.

I can't compare them but I don't think the performance will be that different. There is a
1.8 kHz filter which some have found highly effective for SSB contesting. But keep in mind
that the filter is only a backstop to the DSP filtering which comes into play if you have
signals greater than about S9+20 which are inside the passband of the wider filter. It's
quite possible that many of the 4 kHz wide signals that you are hearing are in fact wide
signals caused by overdriven amplifiers, etc.

> I'm told that the Inrad supplies the filters to Elecraft, so is there really only one
> filter source?

Elecraft does additional testing of the filters it gets from INRAD, so it's advisable to
get them from Elecraft.
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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Darwin, Keith

RE: 5 pole vs. 8 pole filters

In reply to this post by aa4nc

Sorry Will, you lost me on this. Are you saying with the DSP bandwidth set to 2 KHz, you can hear splatter from S-9+ stations that are 4 KHz above or below your frequency? Or are you saying you can easily copy signals that are over 4 KHz wide when you tune them in?

- Keith N1AS -

- K3 711 -

From: [hidden email]

Can anyone comment on the real world contest performance of the 8 pole vs. the 5 pole filters? On SSB with the width dialed in to 1.8-2.0 Khz, I have stations at S9 and above that are easily copyable at over 4 Khz wide which makes it tough on a crowded phone band.