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P3: Span limits move when changing bands

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k6dgw

P3: Span limits move when changing bands

FW: 1.60
Fixed Tune mode
No SVGA
Connected to K3 RS-232 serial port

The "span window" on my P3 will often move up by exactly 5 KHz when I
change bands. For example, on 40 with a 20 KHz span and the span window
going from 7020 to 7040, if I go to another band and then come back to
40, the span will now be 7025 to 7045. Is this normal? Have I missed a
menu option?

It does this most of the time, sometimes the span window stays put where
I left it. I think it has some connection to where in the span window
the cursor is, but so far, I haven't been able to reverse engineer
that. I'd really like it to retain whatever span window limits I've set
for each band.

73,

Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County
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Don Wilhelm

Re: P3: Span limits move when changing bands

Skip,

The P3 span is the same in both cases (20kHz). If your P3 is set to
Tracking mode, you can expect that if your K3 VFO has been changed from
7030kHz to somewhat above that frequency (VFO frequency is always in the
middle of the display).
If your P3 is in Fixed mode, I believe it should stay fixed to your
selected frequency span with no change, but I have not verified that is
true. If you are in Fixed mode and it changes, I do not have an answer
for that.

73,
Don W3FPR

On 8/31/2018 6:07 PM, Fred Jensen wrote:

> FW: 1.60
> Fixed Tune mode
> No SVGA
> Connected to K3 RS-232 serial port
>
> The "span window" on my P3 will often move up by exactly 5 KHz when I
> change bands. For example, on 40 with a 20 KHz span and the span window
> going from 7020 to 7040, if I go to another band and then come back to
> 40, the span will now be 7025 to 7045. Is this normal? Have I missed a
> menu option?
>
> It does this most of the time, sometimes the span window stays put where
> I left it. I think it has some connection to where in the span window
> the cursor is, but so far, I haven't been able to reverse engineer
> that. I'd really like it to retain whatever span window limits I've set
> for each band.
>

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k6dgw

Re: P3: Span limits move when changing bands

It's in fixed-tune mode. The span window width stays constant, as it
should, it's positioning in the band changes, always by +5 KHz. Another
reply advised in a direct email that this is indeed a "feature" and is
related to how the band change is initiated. I can't think of a reason
why it would be useful but it is really just an annoyance. The P3 is
approaching maturity if not already there and perhaps development and
firmware updates are becoming less common.

Incidentally, I haven't touched the alignment of my K2 since you
repaired and aligned it after a u-processor failure several years ago,
and it is still performing perfectly. [:=)

73,

Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County

On 8/31/2018 3:59 PM, Don Wilhelm wrote:

> Skip,
>
> The P3 span is the same in both cases (20kHz). If your P3 is set to
> Tracking mode, you can expect that if your K3 VFO has been changed
> from 7030kHz to somewhat above that frequency (VFO frequency is always
> in the middle of the display).
> If your P3 is in Fixed mode, I believe it should stay fixed to your
> selected frequency span with no change, but I have not verified that
> is true. If you are in Fixed mode and it changes, I do not have an
> answer for that.
>
> 73,
> Don W3FPR
>
> On 8/31/2018 6:07 PM, Fred Jensen wrote:
>> FW: 1.60
>> Fixed Tune mode
>> No SVGA
>> Connected to K3 RS-232 serial port
>>
>> The "span window" on my P3 will often move up by exactly 5 KHz when I
>> change bands. For example, on 40 with a 20 KHz span and the span
>> window going from 7020 to 7040, if I go to another band and then come
>> back to 40, the span will now be 7025 to 7045. Is this normal? Have
>> I missed a menu option?
>>
>> It does this most of the time, sometimes the span window stays put
>> where I left it. I think it has some connection to where in the span
>> window the cursor is, but so far, I haven't been able to reverse
>> engineer that. I'd really like it to retain whatever span window
>> limits I've set for each band.