[Elecraft] K3s Notch Filter

[Bob McGraw K4TAX]

It appears from my measurements that the manual notch is about 200 Hz 
wide at the 6 dB points.  That's the width of only 2 FT-8 signals and 
the depth of the notch is about 40 dB.  Certainly will take out 1 or 2 
signals and not affect others in the 2.7 kHz BW of the normal FT-8 
receiver bandwidth.

As to the bleeding ears, turn the volume down.   I don't find it 
necessary to hear any FT-8 data.   Also, correct attention to AGC 
parameters does a lot to deal with strong signals in the midst of weaker 
signals.   Also the use of ATTN and RF Gain reduction is a big 
advantage, specially on 160M - 40M and to some extent on 20M.

As to those running "legal limit", that depends on band and conditions, 
thus one may find legal limit is necessary to make contacts.   It is a 
weak signal mode not a low power mode. {Flame shields up.}

73

Bob, K4TAX


On 5/12/2019 5:27 PM, HB wrote:
> Unfortunately you can’t.  I miss that feature from several other lesser radios.  You could target a particular audio frequency and set the width of the notch filter and make the offending sound go away!
>
> Hank
> K4HYJ
>
> From: Richard
> Sent: Sunday, May 12, 2019 6:24 PM
> To: Elecraft Reflector
> Subject: [Elecraft] K3s Notch Filter
>
> Is there any way to make the manual notch filter really narrow to keep morons running legal limit on FT8 from wiping out my waterfall and making my ears bleed?
>
> Don’t like what AGC does.
>
> Cheers!
> Richard Kunc - W4KBX
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html