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KX3 Programming Passband and Passband offset ?

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g7ltq

KX3 Programming Passband and Passband offset ?

My KX3 is often operated remotely via a Raspberry Pi and VNC - mainly for digital working with JS8Call and WSJT-X.
I’ve set up a set of programmed instructions that I run before each session to make sure that everything is set up correctly such as Data Mode A, Power Output, Microphone and Audio Settings.

I can see how to set the Bandwidth (Passband Tuning ) using the BW Command but I want to have a defined bandwidth of 500 to 2500 Hz, Is the right way to use
BW 20 ; IS 1500 ; ? Or is there a better way to adjust the PassBand offset ?

John G7LTQ

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ve3ibw

Re: KX3 Programming Passband and Passband offset ?

Hi John,

Would you elaborate as to why you want to have 500-2500hz as your audio
passband width? I have my KX3 BW = 4.00 and run split mode with JS8Call
and WSJT-X. That keeps my signal in the sweet spot and gives me a view to
other signals up past 2500Hz in case I want to try to work them.

regards,
Brian
VE3IBW

On Sun, Apr 28, 2019 at 6:41 AM John Newgas <[hidden email]> wrote:

> My KX3 is often operated remotely via a Raspberry Pi and VNC - mainly for
> digital working with JS8Call and WSJT-X.
> I’ve set up a set of programmed instructions that I run before each
> session to make sure that everything is set up correctly such as Data Mode
> A, Power Output, Microphone and Audio Settings.
>
> I can see how to set the Bandwidth (Passband Tuning ) using the BW Command
> but I want to have a defined bandwidth of 500 to 2500 Hz, Is the right
> way to use
> BW 20 ; IS 1500 ; ? Or is there a better way to adjust the PassBand
> offset ?
>
> John G7LTQ
>
>
>
> ______________________________________________________________
> 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

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

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Please help support this email list: http://www.qsl.net/donate.html

Regards,
Brian
VE3IBW

g7ltq

Re: KX3 Programming Passband and Passband offset ?

Bottom end of the audio passband at 500 because all heartbeats etc. should normally be in 500-1000Hz range. As to bandwidth, I am in a very noisy City environment in London. My antenna is a 12m end fed wire tied to the top of a wooden fence - and half of that length is shielded as it is between two houses.

A narrow bandwidth simply keeps the noise levels down, but will still capture virtually all the JS8Call traffic. 80m is unusable unless I can narrow the passband right down.

John G7LTQ

> On 28 Apr 2019, at 16:43, Brian Waterworth <[hidden email]> wrote:
>
> Hi John,
>
> Would you elaborate as to why you want to have 500-2500hz as your audio passband width? I have my KX3 BW = 4.00 and run split mode with JS8Call and WSJT-X. That keeps my signal in the sweet spot and gives me a view to other signals up past 2500Hz in case I want to try to work them.
>
> regards,
> Brian
> VE3IBW
>
> On Sun, Apr 28, 2019 at 6:41 AM John Newgas <[hidden email] <mailto:[hidden email]>> wrote:
> My KX3 is often operated remotely via a Raspberry Pi and VNC - mainly for digital working with JS8Call and WSJT-X.
> I’ve set up a set of programmed instructions that I run before each session to make sure that everything is set up correctly such as Data Mode A, Power Output, Microphone and Audio Settings.
>
> I can see how to set the Bandwidth (Passband Tuning ) using the BW Command but I want to have a defined bandwidth of 500 to 2500 Hz, Is the right way to use
> BW 20 ; IS 1500 ; ? Or is there a better way to adjust the PassBand offset ?
>
> John G7LTQ
>

ve3ibw

Re: KX3 Programming Passband and Passband offset ?

Thank you for the additional details. The commands you wrote about in this
thread should give you what you want. Have you had a chance to try them
out yet to confirm? I haven't tried myself, just read the programmer's ref
guide (E19) and drew it out on a piece of paper so I could see the
bandwidths and how they shift. I always struggle with which way to shift.
Even wsjtx split mode gets me second guessing the direction of the shift.
Luckily the app knows what to do :-).

Is your motivation for reducing the noise above 2.5Khz due to unwanted AGC
action from these strong signals? We can take this part of the
conversation off-list if you'd like.

regards,
Brian
VE3IBW

On Sun, Apr 28, 2019 at 11:58 AM John Newgas <[hidden email]> wrote:

> Bottom end of the audio passband at 500 because all heartbeats etc. should
> normally be in 500-1000Hz range. As to bandwidth, I am in a very noisy
> City environment in London. My antenna is a 12m end fed wire tied to the
> top of a wooden fence - and half of that length is shielded as it is
> between two houses.
>
> A narrow bandwidth simply keeps the noise levels down, but will still
> capture virtually all the JS8Call traffic. 80m is unusable unless I can
> narrow the passband right down.
>
> John G7LTQ
>
> > On 28 Apr 2019, at 16:43, Brian Waterworth <[hidden email]>
> wrote:
> >
> > Hi John,
> >
> > Would you elaborate as to why you want to have 500-2500hz as your audio
> passband width? I have my KX3 BW = 4.00 and run split mode with JS8Call
> and WSJT-X. That keeps my signal in the sweet spot and gives me a view to
> other signals up past 2500Hz in case I want to try to work them.
> >
> > regards,
> > Brian
> > VE3IBW
> >
> > On Sun, Apr 28, 2019 at 6:41 AM John Newgas <[hidden email] <mailto:
> [hidden email]>> wrote:
> > My KX3 is often operated remotely via a Raspberry Pi and VNC - mainly
> for digital working with JS8Call and WSJT-X.
> > I’ve set up a set of programmed instructions that I run before each
> session to make sure that everything is set up correctly such as Data Mode
> A, Power Output, Microphone and Audio Settings.
> >
> > I can see how to set the Bandwidth (Passband Tuning ) using the BW
> Command but I want to have a defined bandwidth of 500 to 2500 Hz, Is the
> right way to use
> > BW 20 ; IS 1500 ; ? Or is there a better way to adjust the PassBand
> offset ?
> >
> > John G7LTQ
> >
>
> ______________________________________________________________
> 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

Regards,
Brian
VE3IBW