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Using the P3 jumpy when tuning

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K5SM

Using the P3 jumpy when tuning

When I tune the K3, the P3 display is jerky and jumpy. Is this normal?
Is there a parameter that affects this?

73, Bob K5SM
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Bill Hammond

Re: Using the P3 jumpy when tuning

Bob,
I see the same thing with K3 #69 and P3 #817. I assumed it was normal but am interested in what others are experiencing too.
Bill
AK5X

-----Original Message-----
From: Robert Redmon <[hidden email]>
To: Elecraft <[hidden email]>
Sent: Tue, Dec 28, 2010 7:33 am
Subject: [Elecraft] Using the P3 jumpy when tuning

When I tune the K3, the P3 display is jerky and jumpy. Is this normal?
s there a parameter that affects this?
73, Bob K5SM
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Jim Sheldon

Re: Using the P3 jumpy when tuning

In reply to this post by K5SM

I'm completely new to the world of the K3 and P3, but I actually can answer this one for you guys. There is a parameter located in the P3 called "Set the refresh rate (ms). If this is set to a large number the display will only refresh that often. If it happens to be set to 500 ms (1/2 second) or even higher the display will appear very jerky. Set that parameter down to around zero and you'll get quick sweeps that won't appear jerky at all.

Jim - W0EB

> When I tune the K3, the P3 display is jerky and jumpy. Is this
> normal?
> Is there a parameter that affects this?
>
> 73, Bob K5SM
> ______________________________________________________________
> 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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K5SM

Re: Using the P3 jumpy when tuning

On 12/28/2010 8:34 AM, Jim Sheldon wrote:
> I'm completely new to the world of the K3 and P3, but I actually can answer this one for you guys. There is a parameter located in the P3 called "Set the refresh rate (ms). If this is set to a large number the display will only refresh that often. If it happens to be set to 500 ms (1/2 second) or even higher the display will appear very jerky. Set that parameter down to around zero and you'll get quick sweeps that won't appear jerky at all.
>
> Jim - W0EB
Thanks, Jim. That helped; however, part of the jumpiness is (apparently) related to the fact that when the K3 is tuned, the P3 switches out of "Average" mode. If I set Averaging to 2 (or off), and the refresh rate to 0, the display is stable when tuning the K3.

73, Bob K5SM
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Jim Sheldon

Re: Using the P3 jumpy when tuning

One other thing that I hadn't run across but was called to my attention - The averaging mode must be set to 2 as well as having a high refresh rate or the trace will be jerky when you tune the K3. This stands to reason. No matter what the refresh rate for the P3's screen, if the signals are being averaged by the P3, the average timing must be completed before the display can update.

I don't use averaging mode much so hadn't noticed that one yet.

Hope this helps those with "jerky" tuning displays.

Jim - W0EB

> On 12/28/2010 8:34 AM, Jim Sheldon wrote:
>> I'm completely new to the world of the K3 and P3, but I actually
>> can answer this one for you guys. There is a parameter located
>> in the P3 called "Set the refresh rate (ms). If this is set to a
>> large number the display will only refresh that often. If it
>> happens to be set to 500 ms (1/2 second) or even higher the
>> display will appear very jerky. Set that parameter down to
>> around zero and you'll get quick sweeps that won't appear jerky
>> at all.
>>
>> Jim - W0EB

Guy, K2AV

Re: Using the P3 jumpy when tuning

In reply to this post by K5SM

Averaging is clunky when tuning because BY DEFINITION a period must
pass with accumulation of individual data points in order to make a
display. IF you leave averaging on when you tune, by mathematical
definition, the display MUST lag behind where you really are tuned, by
the averaging period. This was exceedingly annoying, so ithe P3
switches averaging off so it shows where you ARE instead of where you
WERE. With averaging on, once you've started to tune, there is now a
difference between where you were and where you are and changing the
screen off averaging necessarily involves a jump. With tuning, having
the P3 showing exactly where you are as the tuning progresses garners
all the votes.

Just another version of between a rock and a hard place, caught
between math and physics, and appearances. What's a fella to do?

73, Guy.

On Tue, Dec 28, 2010 at 9:56 AM, Robert Redmon <[hidden email]> wrote:

> On 12/28/2010 8:34 AM, Jim Sheldon wrote:
>> I'm completely new to the world of the K3 and P3, but I actually can answer this one for you guys. There is a parameter located in the P3 called "Set the refresh rate (ms). If this is set to a large number the display will only refresh that often. If it happens to be set to 500 ms (1/2 second) or even higher the display will appear very jerky. Set that parameter down to around zero and you'll get quick sweeps that won't appear jerky at all.
>>
>> Jim - W0EB
> Thanks, Jim. That helped; however, part of the jumpiness is (apparently) related to the fact that when the K3 is tuned, the P3 switches out of "Average" mode. If I set Averaging to 2 (or off), and the refresh rate to 0, the display is stable when tuning the K3.
>
>
> 73, Bob K5SM
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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>

Michael van Hauten

Re: Using the P3 jumpy when tuning

a good solution (for me ) could be to freeze the averaged signal for the seconds of tuning and moving the frozen signal on the screen. So you could see moving your determined signal to the filter section.
73, Michael

Am 28.12.2010 um 18:23 schrieb Guy Olinger K2AV:

> Averaging is clunky when tuning because BY DEFINITION a period must
> pass with accumulation of individual data points in order to make a
> display. IF you leave averaging on when you tune, by mathematical
> definition, the display MUST lag behind where you really are tuned, by
> the averaging period. This was exceedingly annoying, so ithe P3
> switches averaging off so it shows where you ARE instead of where you
> WERE. With averaging on, once you've started to tune, there is now a
> difference between where you were and where you are and changing the
> screen off averaging necessarily involves a jump. With tuning, having
> the P3 showing exactly where you are as the tuning progresses garners
> all the votes.
>
> Just another version of between a rock and a hard place, caught
> between math and physics, and appearances. What's a fella to do?
>
> 73, Guy.
>
> On Tue, Dec 28, 2010 at 9:56 AM, Robert Redmon <[hidden email]> wrote:
>> On 12/28/2010 8:34 AM, Jim Sheldon wrote:
>>> I'm completely new to the world of the K3 and P3, but I actually can answer this one for you guys. There is a parameter located in the P3 called "Set the refresh rate (ms). If this is set to a large number the display will only refresh that often. If it happens to be set to 500 ms (1/2 second) or even higher the display will appear very jerky. Set that parameter down to around zero and you'll get quick sweeps that won't appear jerky at all.
>>>
>>> Jim - W0EB
>> Thanks, Jim. That helped; however, part of the jumpiness is (apparently) related to the fact that when the K3 is tuned, the P3 switches out of "Average" mode. If I set Averaging to 2 (or off), and the refresh rate to 0, the display is stable when tuning the K3.
>>
>>
>> 73, Bob K5SM
>> ______________________________________________________________
>> 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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Eric Swartz - WA6HHQ

Re: Using the P3 jumpy when tuning

Administrator

In reply to this post by K5SM

This is absolutely normal when averaging is turned on. Each time you
change frequency the P3 has to restart the signal average, since the
data it is receiving has changed.

73, Eric

On 12/28/2010 6:56 AM, Robert Redmon wrote: