(K3) filter setting shifts panadapter display

[RobertG]

I have a K3 [w/ new synthesizer], an LP-Pan, M-Audio Delta, and running
NaP3v4. K3 filters are: 2.7/8p, 1.9/8p, 500/8p, 200/5p. Not sure "where"
this is happening, but decided to start here.

On CW, using the K3 CWT to center a signal, the pan display frequency
for the signal shifts around as follows:

Filter Freq Display
2.7 2,104cps high
1.9 1,580cps high
500  888cps high
200 1,730cps high

Note, NaP3's "global offset" is zero'd on WWV at 10MHz. I've reached a
barren bottom trying to figure this out, and I'd appreciate any wisdom
that others have to offer. Thanks.

...robert

--
Robert G Strickland, PhD ABPH - KE2WY
[hidden email]
Syracuse, New York, USA
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[Sverre Holm (LA3ZA)]

I'm seeing something similar, but I'm not sure if it's the same effect or something related.

Using 400 Hz bandwidth and a 400 Hz roofing filter, and using Auto to zero-beat a CW signal, I consistently get the P3's center frequency to be too low - in this example about 45 Hz too low. See screen capture here:

http://folk.uio.no/sverre/LA3ZA/Offset-P3-K3-400HzXFIL-LA3ZA.jpg

RobertG wrote

On CW, using the K3 CWT to center a signal, the pan display frequency
for the signal shifts around as follows:

[Sverre Holm (LA3ZA)]

That should be too high, not too low.

Sverre Holm (LA3ZA) wrote

 I consistently get the P3's center frequency to be too low - in this example about 45 Hz too low. See screen capture here:

http://folk.uio.no/sverre/LA3ZA/Offset-P3-K3-400HzXFIL-LA3ZA.jpg

[Sverre Holm (LA3ZA)]

I just learned from an offline email that this can be fixed using the Cal function in the P3 (preferreably after 1 hr warm-up) - and indeed that was the case! Thanks to Bill, NR4C.

Sverre Holm (LA3ZA) wrote

That should be too high, not too low.

Sverre Holm (LA3ZA) wrote

 I consistently get the P3's center frequency to be too low - in this example about 45 Hz too low. See screen capture here:

http://folk.uio.no/sverre/LA3ZA/Offset-P3-K3-400HzXFIL-LA3ZA.jpg

[RobertG]

I think I solved this...
In NaP3 there are options for polling various rig parameters [CAT
Polling]. In this section I had polling for "IF Frequency" unchecked.
Once checked, all signals stayed where they belong. Not sure what the
connection is, but it resoled the display problem. Thanks for everyone's
help. It kept me at it till I came across this item.
...robert

On 10/3/2015 21:54, Robert G Strickland wrote:

> I have a K3 [w/ new synthesizer], an LP-Pan, M-Audio Delta, and running
> NaP3v4. K3 filters are: 2.7/8p, 1.9/8p, 500/8p, 200/5p. Not sure "where"
> this is happening, but decided to start here.
>
> On CW, using the K3 CWT to center a signal, the pan display frequency
> for the signal shifts around as follows:
>
> Filter        Freq Display
> 2.7        2,104cps high
> 1.9        1,580cps high
> 500          888cps high
> 200        1,730cps high
>
> Note, NaP3's "global offset" is zero'd on WWV at 10MHz. I've reached a
> barren bottom trying to figure this out, and I'd appreciate any wisdom
> that others have to offer. Thanks.
>
> ...robert
>

--
Robert G Strickland, PhD ABPH - KE2WY
[hidden email]
Syracuse, New York, USA
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[Joe Subich, W4TV-4]

> Not sure what the connection is, but it resoled the display problem.

The K3 shifts the IF center frequency based on mode, Shift/FC, and
selected filter to center the desired signal in the filter.  Without
knowing the IF center frequency (the IS; Get command), the panadapter
[assumed] center frequency will differ from the true IF center freq
by approximately +/- 3 KHz.

In this section I had polling for "IF Frequency" unchecked.

When you enable polling for IF Frequency, NaP3 can correct for the
actual IF frequency rather than assume a nominal value for each mode.

73,

   ... Joe, W4TV


On 10/4/2015 7:08 PM, Robert G Strickland wrote:

> I think I solved this...
> In NaP3 there are options for polling various rig parameters [CAT
> Polling]. In this section I had polling for "IF Frequency" unchecked.
> Once checked, all signals stayed where they belong. Not sure what the
> connection is, but it resoled the display problem. Thanks for everyone's
> help. It kept me at it till I came across this item.
> ...robert
>
> On 10/3/2015 21:54, Robert G Strickland wrote:
>> I have a K3 [w/ new synthesizer], an LP-Pan, M-Audio Delta, and running
>> NaP3v4. K3 filters are: 2.7/8p, 1.9/8p, 500/8p, 200/5p. Not sure "where"
>> this is happening, but decided to start here.
>>
>> On CW, using the K3 CWT to center a signal, the pan display frequency
>> for the signal shifts around as follows:
>>
>> Filter        Freq Display
>> 2.7        2,104cps high
>> 1.9        1,580cps high
>> 500          888cps high
>> 200        1,730cps high
>>
>> Note, NaP3's "global offset" is zero'd on WWV at 10MHz. I've reached a
>> barren bottom trying to figure this out, and I'd appreciate any wisdom
>> that others have to offer. Thanks.
>>
>> ...robert
>>
>

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[RobertG]

Joe...

Excellent. Two equipment/function answers for one question. Very much
appreciated. Have a good day.

...robert

On 10/5/2015 00:10, Joe Subich, W4TV wrote:

>
>> Not sure what the connection is, but it resoled the display problem.
>
> The K3 shifts the IF center frequency based on mode, Shift/FC, and
> selected filter to center the desired signal in the filter.  Without
> knowing the IF center frequency (the IS; Get command), the panadapter
> [assumed] center frequency will differ from the true IF center freq
> by approximately +/- 3 KHz.
>
> In this section I had polling for "IF Frequency" unchecked.
>
> When you enable polling for IF Frequency, NaP3 can correct for the
> actual IF frequency rather than assume a nominal value for each mode.
>
> 73,
>
>    ... Joe, W4TV
>
>
> On 10/4/2015 7:08 PM, Robert G Strickland wrote:
>> I think I solved this...
>> In NaP3 there are options for polling various rig parameters [CAT
>> Polling]. In this section I had polling for "IF Frequency" unchecked.
>> Once checked, all signals stayed where they belong. Not sure what the
>> connection is, but it resoled the display problem. Thanks for everyone's
>> help. It kept me at it till I came across this item.
>> ...robert
>>
>> On 10/3/2015 21:54, Robert G Strickland wrote:
>>> I have a K3 [w/ new synthesizer], an LP-Pan, M-Audio Delta, and running
>>> NaP3v4. K3 filters are: 2.7/8p, 1.9/8p, 500/8p, 200/5p. Not sure "where"
>>> this is happening, but decided to start here.
>>>
>>> On CW, using the K3 CWT to center a signal, the pan display frequency
>>> for the signal shifts around as follows:
>>>
>>> Filter        Freq Display
>>> 2.7        2,104cps high
>>> 1.9        1,580cps high
>>> 500          888cps high
>>> 200        1,730cps high
>>>
>>> Note, NaP3's "global offset" is zero'd on WWV at 10MHz. I've reached a
>>> barren bottom trying to figure this out, and I'd appreciate any wisdom
>>> that others have to offer. Thanks.
>>>
>>> ...robert
>>>
>>
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>

--
Robert G Strickland, PhD ABPH - KE2WY
[hidden email]
Syracuse, New York, USA
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