Data bandwidth behaviour K3s

[Henk de Vries (hdv)]

Hi guys,

I experience a strange bandwidth behaviour when using DATA modes with my new
K3s. (latest firmware) Maybe I am missing something...

Example:
When I select "data" with the mode switch and have DATA A selected the
bandwidth is approx. 700 Hz.
The bandwidth indicator gives "max. bandwidth" (all the bars).
Given the fact that e.g. WSJT uses wide band audio I change the bandwidth
settings to maximum, being 4 kHz.
(Lo = 0.05, High = 4.05)
The bandwidth indicator still gives "max. bandwidth" (no change to previous
indication)

Now I switch to AFSK A : I get the dual band pass filter for RTTY, as
previously selected. So far, so good.
However, I almost do not hear anything.
Only when I turn "HI" a little bit back and forth I do get the narrow filter
response in audio.

As a next step I switch back to DATA A. Once again I get the indication of a
large bandwidth in the display, however what I hear is quite narrow.
Lo is set to 1.15 and High to 1.85. The bandwidth indicator still gives
"max. bandwidth"
I have to adjust shift/width to get the original/wanted 4 kc again.

So I always see the wanted bandwidth in the display, but never hear the
corresponding audio bandwidth right away when switching between DATA A and
AFSK A.
I get the impression that the bandwidth at DATA A has a fixed setting and is
not stored like in SSB/CW.
The behaviour at AFSK A is not clear to me. (The same happens when I switch
to PSK D. No audio as well.)

This could all be my error (if so, what am I doing wrong), dedicated design
(if so, why?) or a bug.

Can someone please tell me what I should do to get the correct behaviour and
memory of bandwidth?
Thanks!

73
Henk PA0C

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[jh3sif]

I guess that there is only ONE memory stack for entire DATA modes. So the latest filter setting is restored when any one of DATA mode is selected.

If you have enabled multiple xtal filters for DATA mode, you can switch xtal filters by pushing XFIL and select band width accordingly.

73 de JH3SIF, Keith

> 2018/06/21 17:47、Henk de Vries (hdv) <[hidden email]>のメール:
>
> Hi guys,
>
> I experience a strange bandwidth behaviour when using DATA modes with my new
> K3s. (latest firmware) Maybe I am missing something...
>
> Example:
> When I select "data" with the mode switch and have DATA A selected the
> bandwidth is approx. 700 Hz.
> The bandwidth indicator gives "max. bandwidth" (all the bars).
> Given the fact that e.g. WSJT uses wide band audio I change the bandwidth
> settings to maximum, being 4 kHz.
> (Lo = 0.05, High = 4.05)
> The bandwidth indicator still gives "max. bandwidth" (no change to previous
> indication)
>
> Now I switch to AFSK A : I get the dual band pass filter for RTTY, as
> previously selected. So far, so good.
> However, I almost do not hear anything.
> Only when I turn "HI" a little bit back and forth I do get the narrow filter
> response in audio.
>
> As a next step I switch back to DATA A. Once again I get the indication of a
> large bandwidth in the display, however what I hear is quite narrow.
> Lo is set to 1.15 and High to 1.85. The bandwidth indicator still gives
> "max. bandwidth"
> I have to adjust shift/width to get the original/wanted 4 kc again.
>
> So I always see the wanted bandwidth in the display, but never hear the
> corresponding audio bandwidth right away when switching between DATA A and
> AFSK A.
> I get the impression that the bandwidth at DATA A has a fixed setting and is
> not stored like in SSB/CW.
> The behaviour at AFSK A is not clear to me. (The same happens when I switch
> to PSK D. No audio as well.)
>
> This could all be my error (if so, what am I doing wrong), dedicated design
> (if so, why?) or a bug.
>
> Can someone please tell me what I should do to get the correct behaviour and
> memory of bandwidth?
> Thanks!
>
> 73
> Henk PA0C
>
> ______________________________________________________________
> 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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