K3/P3 Question

[k6dgw]

Today, I was copying KSM on 6474 KHz on one VFO and decided to send
K6KPH a signal report on 7050 KHz on the other.  I had set my P3 to 20
KHz span, and the left edge was 7040 KHz [I'm in fixed-tune mode, the
VFO cursor moves, I was "two spans up" from the bottom of the band] and
the VFO A cursor was in the middle of the display when I was on 7050.

I tapped A/B, now listening to KSM on 6474.  The P3 showed a 20 KHz span
from 6460 to 6480 and the signal at 6474.  I got a QSA and QRK, and then
tapped A/B again to swap VFO's.  At this point, the left edge of the P3
display was my transmit frequency [7050] instead of 7040 where I had set
it previously.  It seems to be totally repeatable.

Is this normal behavior?  I guess I expected the P3 to return to the
configuration I had set on the 40m VFO ... 7040-7060 with the tx freq in
the middle.

73,

Fred K6DGW
- Northern California Contest Club
- CU in the 2012 Cal QSO Party 6-7 Oct 2012
- www.cqp.org

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[Alan Bloom]

I believe 6474 kHz probably falls within the definition of the 40 meter
band on the K3.  (I'm not home now so I can't check.)  So when you jump
back to 7050 the P3 does not use the per-band start/stop frequencies
stored in EEPROM (since you haven't changed bands) but instead uses the
algorithm for changing frequencies within a band.  The algorithm prefers
"even" start frequencies, meaning frequencies divisible by 100 kHz, 50
kHz, etc.  I probably should tweak the algorithm so that if the band edge
ends up too close to the K3 VFO frequency it moves down a bit to center
the VFO better.

Alan

> Today, I was copying KSM on 6474 KHz on one VFO and decided to send
> K6KPH a signal report on 7050 KHz on the other.  I had set my P3 to 20
> KHz span, and the left edge was 7040 KHz [I'm in fixed-tune mode, the
> VFO cursor moves, I was "two spans up" from the bottom of the band] and
> the VFO A cursor was in the middle of the display when I was on 7050.
>
> I tapped A/B, now listening to KSM on 6474.  The P3 showed a 20 KHz span
> from 6460 to 6480 and the signal at 6474.  I got a QSA and QRK, and then
> tapped A/B again to swap VFO's.  At this point, the left edge of the P3
> display was my transmit frequency [7050] instead of 7040 where I had set
> it previously.  It seems to be totally repeatable.
>
> Is this normal behavior?  I guess I expected the P3 to return to the
> configuration I had set on the 40m VFO ... 7040-7060 with the tx freq in
> the middle.
>
> 73,
>
> Fred K6DGW
> - Northern California Contest Club
> - CU in the 2012 Cal QSO Party 6-7 Oct 2012
> - www.cqp.org
>
> ______________________________________________________________
> 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
>
>

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[k6dgw]

OK Alan, that answers my question.  It probably would be nice ... at
least in this situation but others may come up with counter examples ...
that it went back to where I had it set, but this is a pretty small
thing.  Whenever you're bored and looking for something to do, like that
ever happens :-)

73,

Fred K6DGW
- Northern California Contest Club
- CU in the 2012 Cal QSO Party 6-7 Oct 2012
- www.cqp.org
On 8/11/2012 6:33 PM, [hidden email] wrote:
> I believe 6474 kHz probably falls within the definition of the 40 meter
> band on the K3.  (I'm not home now so I can't check.)  So when you jump
> back to 7050 the P3 does not use the per-band start/stop frequencies
> stored in EEPROM (since you haven't changed bands) but instead uses the
> algorithm for changing frequencies within a band.  The algorithm prefers
> "even" start frequencies, meaning frequencies divisible by 100 kHz, 50
> kHz, etc.  I probably should tweak the algorithm so that if the band edge
> ends up too close to the K3 VFO frequency it moves down a bit to center
> the VFO better.


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