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Subject: K3 SSB filters

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Subject: K3 SSB filters

Subject: [Elecraft] K3 SSB filters
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With the recent experience in SSB? contests, I'm thinking of upgrading
my SSB filter(s). Currently for SSB I have only the 2.8 filter. What are
thoughts about other SSB filters? I know when I narrow the bandwidth to
1.8 the intelligibility goes down.

-de John NI0K

John, when narrowing the SSB bandwidth down to 1.8 use the shift control also and shift from 1.5 down to wards 1.05 or so. Makes a big difference. I'm sure a MACRO could be set up to do that automatically but I don't find it necessary often enough to worry about.
73,Gary KC9EE
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Barry LaZar

Re: Subject: K3 SSB filters

John,
I have either 2.8 or 2.7 KHz filters in my K3s; I just don't
remember which I ordered. I rely on the bandwidth of the filter that
follows which is created by DSP. It works fine for me. I know this setup
has stop bands that are around 105 db, but I don't know what the shape
factor is; some of this is available from Bob Sherwood's site.

The filters you are discussing are roofing filters. They are
primarily there to protect the the ADC from seeing too much energy and
overloading. Selectivity is secondary. Unless you perceive that you are
having a problem, I wouldn't go to the trouble of swapping out filters.
However, there are a number of hams who will disagree with me.

73,
Barry
K3NDM

------ Original Message ------
From: "Gary Hunt via Elecraft" <[hidden email]>
To: [hidden email]
Sent: 3/31/2020 2:55:44 PM
Subject: [Elecraft] Subject: K3 SSB filters

>Subject: [Elecraft] K3 SSB filters
>Message-ID: <[hidden email]>
>Content-Type: text/plain; charset=utf-8; format=flowed
>
>With the recent experience in SSB? contests, I'm thinking of upgrading
>my SSB filter(s). Currently for SSB I have only the 2.8 filter. What are
>thoughts about other SSB filters? I know when I narrow the bandwidth to
>1.8 the intelligibility goes down.
>
>-de John NI0K
>
>
>John, when narrowing the SSB bandwidth down to 1.8 use the shift control also and shift from 1.5 down to wards 1.05 or so. Makes a big difference. I'm sure a MACRO could be set up to do that automatically but I don't find it necessary often enough to worry about.
>73,Gary KC9EE
>______________________________________________________________
>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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Bob McGraw - K4TAX

Re: Subject: K3 SSB filters

In reply to this post by Elecraft mailing list

Yes, but with a 1.8 kHz filter, the adjacent QRM goes away as well.

One can't have good quality from a wide bandwidth if the adjacent
station is splattering over into your receiver bandwidth. Something has
got to give. After all, it is communications quality audio. Narrow
the bandwidth to 1.8 kHz and adjust the SHIFT to better the quality and
lessen the QRM.

73

Bob, K4TAX

On 3/31/2020 1:55 PM, Gary Hunt via Elecraft wrote:

> Subject: [Elecraft] K3 SSB filters
> Message-ID: <[hidden email]>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
> With the recent experience in SSB? contests, I'm thinking of upgrading
> my SSB filter(s). Currently for SSB I have only the 2.8 filter. What are
> thoughts about other SSB filters? I know when I narrow the bandwidth to
> 1.8 the intelligibility goes down.
>
> -de John NI0K
>
>
> John, when narrowing the SSB bandwidth down to 1.8 use the shift control also and shift from 1.5 down to wards 1.05 or so. Makes a big difference. I'm sure a MACRO could be set up to do that automatically but I don't find it necessary often enough to worry about.
> 73,Gary KC9EE
> ______________________________________________________________
> 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]