Changing CW pitch on K2

[Eddy]

If I change the CW pitch on my K2, do I then need to realign any of the filters?

Thanks,

73
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[Don Wilhelm-4]

Eddy,

The answer is "maybe".  If you are changing only by a small amount, then
you will not have to realign the filters.
If you change the pitch by a goodly amount, then the answer is yes.

Look at it this way - if you have the most narrow filter set for a
center frequency of 600 Hz and the filter width is 200 Hz, that filter
will reproduce a frequency of 500 Hz to 700 Hz and still be within the
bandpass (although the extreme frequencies will be on the edge of the
filter bandpass).  If your change is greater than that range, you will
want to re-align the filters.

I would suggest that if you are experimenting with your preferred CW
pitch, you should not change the filter alignment, but after you settle
on a given pitch, then align the filters to center at that pitch.

If you have the KAF2 or KDSP2 installed, I would strongly recommend that
you adjust the center frequencies for those options to your new chosen
CW pitch.

For information about setting the filters to your chosen pitch, refer to
Part 3 of the K2 Dial Calibration article on my website www.w3fpr.com.

73,
Don W3FPR

On 10/23/2013 7:08 PM, Eddy wrote:
> If I change the CW pitch on my K2, do I then need to realign any of the filters?
>
>

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[Vic Rosenthal]

Yes, if you want to center the new pitch in the filter.

On 10/23/2013 4:08 PM, Eddy wrote:

> If I change the CW pitch on my K2, do I then need to realign any of the filters?
>
> Thanks,
>
> 73
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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> Post: mailto:[hidden email]
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--
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/
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[Igor Sokolov-2]

My friend, R9DX is in Madeira now. He has K3 and Buddipole antenna with him
and planned to operate in CQWW SSB this coming weekend. He has put up
buddipole and tuned it with AA-530 antenna analyzer to 1: 1  SWR. It all
worked well with 100w output on that band. Then he desided to try 28 MHz
without retuning antenna. He has switched ATU in and tuned it. He has easily
obtained 1 : 1 SWR reading on the radio. Then he tried to transmit and
something happened inside. He smelled somethind burning and SWR became 4 :1.
He assumed that may be something happened to ATU. So he went back to 15 m,
switched ATU off and still got 4:1 SWR on the display. Switching to low
power (10W) which should exclude the problems associated with KPA3 produced
the same 4:1 SWR.  Dowble checking antenna with AA-530 shows perfect SWR on
15 m.
Any idea where to look?  I suspect it might be SWR bridge but then is there
something he can do (like disabling SWR bridge at his own risk) having no
spare parts around?


73, Igor UA9CDC

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[dw-4]

I few years ago, I built a tiny transmitter box using a simple Canned
Crystal Oscillator that runs at 7.385mhz.  
Pop a 9 volt battery on it and lay the wire lead near the K2 when I’m
re-adjusting the filters.

I know it’s not the conventional method, and I’ve tried the others.
But it’s quick and easy and gives me good results.

Have fun with your K2!! :-]
N1BBR
--
 [hidden email]

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[drewko]

I aligned the filters on my K2 for several different pitches and wrote
down the values for each. Then I was able to change pitch fairly
quickly, within a minute or two, by dialing in the recorded values.

73,
Drew
AF2Z



On Wed, 23 Oct 2013 16:08:30 -0700 (PDT), you wrote:

>If I change the CW pitch on my K2, do I then need to realign any of the filters?
>
>Thanks,
>
>73

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