Selectivity

[Roger D Johnson]

I noticed that during the contest, that if I selected 50 or 100 Hz selectivity,
the audio would drop way down. It didn't used to be this way. I tried reloading
an earlier version of the software but couldn't figure out how to do it.

Hope this comes through, finally!


73, Roger
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[Mike K2MK]

Hi Roger,

Take a look at your RX equalizer settings. If I remember correctly the DSP
will not apply positive DB equalizer settings at a bandwidth setting of
100Hz or 50Hz. So if for example your pitch is set to 600Hz and you have a
6db boost dialed in on your equalizer at 600Hz then when you narrow your
bandwidth you will experience a drop in audio level of 6db.

Again, if I remember correctly, the solution is to only apply negative db
settings for your CW RX equalizer. So you might drop all frequencies except
600Hz by 6db. Then when you narrow your bandwidth you won't experience an
audio level drop.

73,
Mike K2MK


Roger D Johnson wrote

> I noticed that during the contest, that if I selected 50 or 100 Hz
> selectivity,
> the audio would drop way down. It didn't used to be this way. I tried
> reloading
> an earlier version of the software but couldn't figure out how to do it.
>
> Hope this comes through, finally!
>
>
> 73, Roger

--
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[Vic Rosenthal]

This is probably because you are using the rx equalizer and have boosted your preferred cw pitch. The narrowest filters (50 and 100 Hz) do not support the equalizer, so the boost disappears (this is slightly oversimplified, since there is an option for the type of DSP filter used for the narrow bandwidths that also affects this).

Anyway, the trick is not to boost any frequency ranges — just have the equalizer cut the ones you don’t want.

The rx equalizer doesn’t do much on CW with narrow bandwidths anyway, since the bandwidth determines the range of pitches that you hear.

Vic 4X6GP

> On 30 Jan 2018, at 23:39, Roger D Johnson <[hidden email]> wrote:
>
> I noticed that during the contest, that if I selected 50 or 100 Hz selectivity, the audio would drop way down. It didn't used to be this way. I tried reloading
> an earlier version of the software but couldn't figure out how to do it.
>
> Hope this comes through, finally!
>
>
> 73, Roger
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

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