K3 Beta Firmware Release -- MCU Revision 2.15

[wayne burdick]

K3 beta-test firmware revision 2.15 is now available. Full details
appear below and in the release notes.

The use of beta-test firmware is encouraged, but optional. Please send
any problem reports to [hidden email]. For instructions on how
to obtain and load beta firmware, please see:

   http://www.elecraft.com/K3/k3_software.htm

73,
Wayne
N6KR

* * *

MCU 2.15 / DSP 1.84, 7-8-08

* MEMORY RECALL ON 6 M (CW REV, etc.): Corrected recall of
   CW normal/reverse selection and other parameters on 6 meters.

* 50 AND 100 HZ bandwidths are now available in DATA A (for use
   with PSK31 and other narrow modes).

* SYNTH TUNING CORRECTED ON 80 M: Downward tuning of the VFO was
sometimes
   leading to loss of receive and/or transmit at certain frequencies.

* SYNC DATA: Selecting sync data or “-S” now ensures that the
   same crystal filter will be used for both RX and TX -- either 2.7 or
2.8 kHz.
   (Sync data mode, enabled by assigning PF1 or PF2 to CONFIG:SYNC DT,
can be
   used to minimize the error rate of AMTOR, PACTOR, ARQ, and similar
modes.)
   While -S is in effect, the receive crystal filter cannot be changed
with
   XFIL, and SHIFT/LOCUT/HICUT are unavailable. WIDTH can still be
changed,
   but it will affect only the DSP IF, not the crystal filter. The RX
   and TX first I.F.s will thus remain identical, a requirement for -S
operation.


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[Leigh L. Klotz Jr WA5ZNU]

Is this to minimize a constant frequency shift between TX and RX or is
it related to phase response (or something else)?
73 es TNX,
Leigh/WA5ZNU

wayne burdick wrote:

> MCU 2.15 / DSP 1.84, 7-8-08
> ...
> * SYNC DATA: Selecting sync data or “-S” now ensures that the
>   same crystal filter will be used for both RX and TX -- either 2.7 or
> 2.8 kHz.
>   (Sync data mode, enabled by assigning PF1 or PF2 to CONFIG:SYNC DT,
> can be
>   used to minimize the error rate of AMTOR, PACTOR, ARQ, and similar
> modes.)
>   While -S is in effect, the receive crystal filter cannot be changed
> with
>   XFIL, and SHIFT/LOCUT/HICUT are unavailable. WIDTH can still be
> changed,
>   but it will affect only the DSP IF, not the crystal filter. The RX
>   and TX first I.F.s will thus remain identical, a requirement for -S
> operation.
>

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[wayne burdick]

On Jul 9, 2008, at 6:41 PM, Leigh L. Klotz, Jr. wrote:

> Is this to minimize a constant frequency shift between TX and RX....

It's to ensure *no* frequency shift between the two (just in -S mode),
which minimizes T/R delays because we don't have to switch crystal
filters.

AMTOR and related modes can also be used without engaging SYNC DATA,
assuming a suitable value of CONFIG:PLL RLS is set up. I'll expand on
this topic in an application note when I get a chance.

73,
Wayne
N6KR

> wayne burdick wrote:
>> MCU 2.15 / DSP 1.84, 7-8-08
>> ...
>> * SYNC DATA: Selecting sync data or “-S” now ensures that the
>>   same crystal filter will be used for both RX and TX -- either 2.7
>> or 2.8 kHz.
>>   (Sync data mode, enabled by assigning PF1 or PF2 to CONFIG:SYNC DT,
>> can be
>>   used to minimize the error rate of AMTOR, PACTOR, ARQ, and similar
>> modes.)
>>   While -S is in effect, the receive crystal filter cannot be changed
>> with
>>   XFIL, and SHIFT/LOCUT/HICUT are unavailable. WIDTH can still be
>> changed,
>>   but it will affect only the DSP IF, not the crystal filter. The RX
>>   and TX first I.F.s will thus remain identical, a requirement for -S
>> operation.
>>
>
>

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