K3/K3S: How to adjust SSB receive bandwidth up to 4.0 kHz

[wayne burdick]

Hi all,

The K3's SSB receive passband can be widened to as much as 4.0 kHz if you have a 6.0 kHz crystal filter. This is useful for ESSB in particular. However, there's a minor problem with the present firmware that requires a workaround (for now).

The trick is that you have to have LO/HI CUT selected rather than SHIFT/WIDTH. If you select LO/HI CUT, then NORMalize the passband, you can adjust HI CUT to as high as 4.00, and the DSP's bandwidth will be set up accordingly.

If you have WIDTH/SHIFT selected, you may only be able to get the DSP's bandwidth up to 3.50 kHz, even though the display says 4.00.

(Barry, N1EU, discovered this idiosyncrasy. Thanks!)

73,
Wayne
N6KR



______________________________________________________________
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]

[Bill Frantz]

While working in this part of the firmware, could 4K receive
passband be made to work with the 13KHz FM filter as well?

Thanks, Bill AE6JV

On 5/12/16 at 10:03 AM, [hidden email] (Wayne Burdick) wrote:

>The K3's SSB receive passband can be widened to as much as 4.0
>kHz if you have a 6.0 kHz crystal filter. This is useful for
>ESSB in particular. However, there's a minor problem with the
>present firmware that requires a workaround (for now).
>
>The trick is that you have to have LO/HI CUT selected rather
>than SHIFT/WIDTH. If you select LO/HI CUT, then NORMalize the
>passband, you can adjust HI CUT to as high as 4.00, and the
>DSP's bandwidth will be set up accordingly.
>
>If you have WIDTH/SHIFT selected, you may only be able to get
>the DSP's bandwidth up to 3.50 kHz, even though the display
>says 4.00.

------------------------------------------------------------------------
Bill Frantz        |"Insofar as the propositions of mathematics
refer to
408-356-8506       | reality, they are not certain; and insofar
they are
www.pwpconsult.com | certain, they do not refer to reality.”
-- Einstein

______________________________________________________________
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]

[Joe Subich, W4TV-4]

On 5/12/2016 3:07 PM, Bill Frantz wrote:
> While working in this part of the firmware, could 4K receive passband be
> made to work with the 13KHz FM filter as well?

4 KHz receive passband *already works* with the FM filter.  Simply set
FC (shift) = 2.0 - 2.2 and dial in the desired bandwidth.  The *only*
reason that one does not get the full bandwidth is that shift is less
that 1/2 the width.  The actual bandwidth achieved with the K3 in shift
- width mode is [FC (Shift) + BW/2]

73,

    ... Joe, W4TV
______________________________________________________________
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]

[Bill Frantz]

I guess I'm just not getting it. I am in DATA A mode with the
13KHz FM filter automatically selected. Following Wayne's
directions, I put the bandwidth controls into Lo/Hi mode and
hold NORM to normalize the passband. I then turn the Hi knob to
max (4.00 shows) and the Lo know to minimum (0.00 shows). When I
look at the bandwidth displayed in the waterfall on fldigi, the
computer is getting audio from about 150Hz to 3000Hz. What am I
doing wrong?

I am using a Tascam UX-122 mkii as a "sound card".

73 Bill AE6JV

On 5/12/16 at 12:43 PM, [hidden email] (Joe Subich, W4TV) wrote:

>
>On 5/12/2016 3:07 PM, Bill Frantz wrote:
>>While working in this part of the firmware, could 4K receive passband be
>>made to work with the 13KHz FM filter as well?
>
>4 KHz receive passband *already works* with the FM filter.  Simply set
>FC (shift) = 2.0 - 2.2 and dial in the desired bandwidth.  The *only*
>reason that one does not get the full bandwidth is that shift is less
>that 1/2 the width.  The actual bandwidth achieved with the K3
>in shift - width mode is [FC (Shift) + BW/2]
>
>73,
>
>... Joe, W4TV
>______________________________________________________________
>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]
>

---------------------------------------------------------------------------
Bill Frantz        |"Web security is like medicine - trying to
do good for
408-356-8506       |an evolved body of kludges" - Mark Miller
www.pwpconsult.com |

______________________________________________________________
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]

[wayne burdick]

I was referring to SSB mode, Bill. Not sure if this extends to DATA A mode, yet, but I'll investigate.

Wayne
N6KR

On May 12, 2016, at 1:11 PM, Bill Frantz <[hidden email]> wrote:

> I guess I'm just not getting it. I am in DATA A mode with the 13KHz FM filter automatically selected. Following Wayne's directions, I put the bandwidth controls into Lo/Hi mode and hold NORM to normalize the passband. I then turn the Hi knob to max (4.00 shows) and the Lo know to minimum (0.00 shows). When I look at the bandwidth displayed in the waterfall on fldigi, the computer is getting audio from about 150Hz to 3000Hz. What am I doing wrong?
>
> I am using a Tascam UX-122 mkii as a "sound card".
>
> 73 Bill AE6JV



______________________________________________________________
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]

[Joe Subich, W4TV-4]

I don't know what's going on elsewhere but with FW 5.38 and the
KFL3B-FM I regularly get 4 KHz bandwidth (10 - 4000 Hz, or 200 -
4200 Hz) on the waterfall in WSJT-X or an audio spectrum analyzer
(e.g., Spectran, Spectrum Lab, etc.) in either SSB (LSB/USB) or
DATA (DATA A and AFSK A) modes using Line Out and the sound card
in microKEYER II.

The only necessary adjustment is to set SHIFT to 2.00, 2.10 or 2.20
if using Shift/Width or use HI/LO to set appropriate HI/LO cutoff
frequencies.

73,

    ... Joe, W4TV


On 5/12/2016 5:17 PM, Wayne Burdick wrote:

> I was referring to SSB mode, Bill. Not sure if this extends to DATA A mode, yet, but I'll investigate.
>
> Wayne
> N6KR
>
> On May 12, 2016, at 1:11 PM, Bill Frantz <[hidden email]> wrote:
>
>> I guess I'm just not getting it. I am in DATA A mode with the 13KHz FM filter automatically selected. Following Wayne's directions, I put the bandwidth controls into Lo/Hi mode and hold NORM to normalize the passband. I then turn the Hi knob to max (4.00 shows) and the Lo know to minimum (0.00 shows). When I look at the bandwidth displayed in the waterfall on fldigi, the computer is getting audio from about 150Hz to 3000Hz. What am I doing wrong?
>>
>> I am using a Tascam UX-122 mkii as a "sound card".
>>
>> 73 Bill AE6JV
>
>
>
>

______________________________________________________________
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]

[Bill Frantz]

I think my problem is with fldigi. I tried using cocoaModem, and
it shows audio up to 4.2 KHz when I follow Joe's technique of
setting the knobs to SHIFT/WIDTH, the SHIFT to 2.20 and the
WIDTH to 4.00. Sorry for the bandwidth.

73 Bill AE6JV

On 5/12/16 at 3:28 PM, [hidden email] (Joe Subich, W4TV) wrote:

>I don't know what's going on elsewhere but with FW 5.38 and the
>KFL3B-FM I regularly get 4 KHz bandwidth (10 - 4000 Hz, or 200 -
>4200 Hz) on the waterfall in WSJT-X or an audio spectrum analyzer
>(e.g., Spectran, Spectrum Lab, etc.) in either SSB (LSB/USB) or
>DATA (DATA A and AFSK A) modes using Line Out and the sound card
>in microKEYER II.
>
>The only necessary adjustment is to set SHIFT to 2.00, 2.10 or 2.20
>if using Shift/Width or use HI/LO to set appropriate HI/LO cutoff
>frequencies.

-----------------------------------------------------------------------
Bill Frantz        | "The only thing we have to   | Periwinkle
[phone]      | fear is fear itself." - FDR  | 16345
Englewood Ave
www.pwpconsult.com | Inaugural address, 3/4/1933  | Los Gatos,
CA 95032

______________________________________________________________
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]