If you return to a band but at a different K3 VFO frequency, the new
frequency may be outside the P3's span. If that happens, the P3 will
re-tune using an algorithm determined by the MENU > FixMode setting.
If you want to be sure the P3 frequency doesn't change you can set
FixMode to "Static". Then the P3 frequency range will not change even
if the K3 VFO frequency is out of range.
It may be that some logging programs do not retain the old frequency
upon a band change. Even if the frequency is "wrong" only for an
instant, that would be enough to confuse the P3 if not in "Static" mode.
It would be interesting to see what N1MM and other logging programs are
sending to the P3/K3 on band changes. There is a little-known serial
debug monitor in the P3 that shows the traffic on the two RS-232 ports.
You activate the function by simultaneously holding the DISPLAY/AVERAGE
and FN1/FN5 buttons. The P3 screen changes to show RS-232 traffic
color-coded to show on which port and in which direction the traffic is
going.
The data can fly by awfully fast when using a logging program. You can
freeze the screen immediately after a band change by tapping the FN2
key. Tap it again to unfreeze the screen. If you want to show more
data you can choose a smaller font size with the MENU > Font feature.
I'm pretty sure that feature still exists in current P3 code. I can't
check this myself since all my ham equipment was recently lost in a fire.
Alan N1AL
On 2/8/2021 4:05 PM, Jim McDonald wrote:
I use the Fixed Tune Mode too but the center frequency sometimes isn't
remembered when returning to a previously-used band. If it makes any
difference, I'm usually using N1MM+ (often with Win4K3Suite) to control the
radio.
73, Jim N7US
-----Original Message-----
From: [email protected] <[email protected]> On
Behalf Of Fred Jensen
Sent: Monday, February 8, 2021 16:45
To: [email protected]
Subject: Re: [Elecraft] P3 span changing
Don't understand your "follow option" question. I run mine in Fixed Tune Mode
which holds the span [i.e. edge frequencies] constant and the two VFO's show up as two
vertical cursors in the spectrum display. The cursors move as I tune, and when I go
beyond the edge, the span shifts by the amount I've set in the menu ... I use a full
span. In the Tracking Mode, your receive frequency is always centered and the spectrum
moves past it as you tune.
73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County
On 2/8/2021 2:34 PM, Dave Cole wrote:
How does one set the follow option, I just looked through the menu of
the P3, and don't see it.
73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources
On 2/8/21 12:39 PM, Fred Jensen wrote:
Yes, it has been discussed, and yes, that is the case. It seems to
be most prevalent when returning to a band after moving off for a Q,
such as in NAQP's when the return is being commanded via CAT command.
In fairness to the Elecraft developers, it /*appears*/ that it is
attempting to put the frequency you are returning into the center-ish
part of the display which is not totally unreasonable.
73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County
On 2/7/2021 12:28 PM, Jim McDonald wrote:
I know this has been asked before but I don't remember the answer.
Isn't the P3 supposed to remember the span and center frequency from
band to band? It seems to change center frequency even if the band
hasn't changed, but that may not be the case.
73, Jim N7US
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