[K3] SHIFT/WIDTH in DATA A mode

[hb9brj]

After a long pause I started to operate in PACTOR again. My K3 behaves differently today compared to earlier firmware some years ago. Current FW is MCU 05.14, FPF 01.19, DSP 02.83.

In DATA A mode:
(1) PITCH shows N/A, in contradiction to the user manual. Seems to be fixed at 1500 Hz. That's fine with me, as I can adjust the mark/space tones in my PACTOR modem accordingly.

(2) SHIFT/WIDTH controls are showing a strange behaviour:
Based on the green LEDs next to the 2 controls, only LO/HI CUT is available, SHIFT/WIDTH is not. When moving LO/HI cut, filter graphic and VFO B display are both indicating a LO/HI cut, but what effectively happens is a width variation. Verification is easy: Acoustically or on the P3 display.

73, Markus HB9BRJ

[hb9brj]

I was able to narrow down the problem. It is related to SYNC DATA (CONFIG:SYNC DT) which forces the same crystal filter to be used for both RX and TX. As long as SYNC DATA is OFF everything works as expected.

If SYNC DATA is ON:
(1) Toggling between SHIFT/WIDTH and LO/HI CUT is inhibited
(2) SHIFT control is inactive
(3) LO CUT and HI CUT both act as WIDTH control

Am not sure if these limitations are a logical consequence of SYNC DATA ON or an unwanted side-effect.

73, Markus HB9BRJ

[wayne burdick]

SYNC DATA provides a very short turnaround time by disabling operations that would require switching the synthesizer frequency between receive and transmit. (This is analogous to CW QRQ mode.) If you have the new synth installed (KSYN3A), the delays will be much shorter even with SYNC DATA turned off.

73,
Wayne
N6KR



On Apr 5, 2015, at 8:27 AM, hb9brj <[hidden email]> wrote:

> I was able to narrow down the problem. It is related to SYNC DATA
> (CONFIG:SYNC DT) which forces the same crystal filter to be used for both RX
> and TX. As long as SYNC DATA is OFF everything works as expected.
>
> If SYNC DATA is ON:
> (1) Toggling between SHIFT/WIDTH and LO/HI CUT is inhibited
> (2) SHIFT control is inactive
> (3) LO CUT and HI CUT both act as WIDTH control
>
> Am not sure if these limitations are a logical consequence of SYNC DATA ON
> or an unwanted side-effect.
>
> 73, Markus HB9BRJ
>
>
>
> --
> View this message in context: http://elecraft.365791.n2.nabble.com/K3-SHIFT-WIDTH-in-DATA-A-mode-tp7601016p7601025.html
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