Elecraft

transmit and reciever alignment

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Roland Whitsitt

transmit and reciever alignment

Hi Tom and others who could help,
You were very helpfull several months ago and I'm hoping you can help me again. I just installed the 100 watt option and I've made two contacts on CW. One on 80 meters and the other on 40 meters. But I seem to be transmitting 1.01 khz down from my recieve. Is this a filter alignment problem or is there an electrical problem like with a toroid or something.
Thanks,
Roland in Stockton
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Don Wilhelm-3

RE: transmit and reciever alignment

Roland,

It is most likely a filter alignment problem, but I will reserve final
judgement until you answer some questions about how you are operating.

Did you do your filter alignment with Spectrogram? If not, the visual
display of the filter passbands makes alignment a snap, but besides, if you
just set them 'by ear', it is difficult to find the filter center, so you
may be off quite a bit.

Second, were you listening with any filter other than FL1? If the filters
are aligned, this is not a problem, but if not aligned, that could be
explaination of your problem.

Try using FL1 for both transmit and receive and see if your listen frequency
is not also your transmit frequency - if it is not, then you have something
other than a filter alignment problem. Don't forget to take into account
the fact that the K2 display is offset on receive by the amount of your set
sidetone pitch, so the frequency on the K2 display should be your transmit
frequency. For this reason, it is important to listen to a signal at the
same audio pitch as your sidetone pitch. The K2 will indicate the carrier
frequency of the signal you are listening to provided you are properly tuned
to zero-beat (same pitch as your sidetone).

Also, make certain that you have all filters for CW on the same sideband -
the BFO frequencies should be somewhat close to those shown in the chart on
page 89 of the K2 manual. If you find yours way off, set then initially to
the values in the manual and then finish up the alignment with Spetrogram.

For further info on the CAL FIL procedure, see my website article on K2 Dial
Calibration at http://w3fpr.qrpradio.com - in addition to the info I have
provided, I also have links to further info and Tom Hammond's Spectrogram
writeups in the article.

73,
Don W3FPR

> -----Original Message-----
>
> Hi Tom and others who could help,
> You were very helpfull several months ago and I'm hoping you
> can help me again. I just installed the 100 watt option and I've
> made two contacts on CW. One on 80 meters and the other on 40
> meters. But I seem to be transmitting 1.01 khz down from my
> recieve. Is this a filter alignment problem or is there an
> electrical problem like with a toroid or something.
> Thanks,
> Roland in Stockton
>

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Post to: [hidden email]
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Subscriber Info (Addr. Change, sub, unsub etc.):
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Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

Roland Whitsitt

Re: transmit and reciever alignment

Thanks Don, Yup that did it. I did use spectrogram. When I added the 100
watt option and upgraded CPU's, something got out of kilter. Now it's
better but everybody's CW note is just a hair raspy sounding. But at least
I know I'm on the right track now. THANKS!
Roland #3090
----- Original Message -----
From: "Don Wilhelm" <[hidden email]>
To: "Roland & Elvie Whitsitt" <[hidden email]>; "Tom Hammond"
<[hidden email]>
Cc: "elecraft" <[hidden email]>
Sent: Sunday, February 26, 2006 4:46 PM
Subject: RE: [Elecraft] transmit and reciever alignment

> Roland,
>
> It is most likely a filter alignment problem, but I will reserve final
> judgement until you answer some questions about how you are operating.
>
> Did you do your filter alignment with Spectrogram? If not, the visual
> display of the filter passbands makes alignment a snap, but besides, if
you
> just set them 'by ear', it is difficult to find the filter center, so you
> may be off quite a bit.
>
> Second, were you listening with any filter other than FL1? If the filters
> are aligned, this is not a problem, but if not aligned, that could be
> explaination of your problem.
>
> Try using FL1 for both transmit and receive and see if your listen
frequency
> is not also your transmit frequency - if it is not, then you have
something
> other than a filter alignment problem. Don't forget to take into account
> the fact that the K2 display is offset on receive by the amount of your
set
> sidetone pitch, so the frequency on the K2 display should be your transmit
> frequency. For this reason, it is important to listen to a signal at the
> same audio pitch as your sidetone pitch. The K2 will indicate the carrier
> frequency of the signal you are listening to provided you are properly
tuned
> to zero-beat (same pitch as your sidetone).
>
> Also, make certain that you have all filters for CW on the same sideband -
> the BFO frequencies should be somewhat close to those shown in the chart
on
> page 89 of the K2 manual. If you find yours way off, set then initially
to
> the values in the manual and then finish up the alignment with Spetrogram.
>
> For further info on the CAL FIL procedure, see my website article on K2
Dial

> Calibration at http://w3fpr.qrpradio.com - in addition to the info I have
> provided, I also have links to further info and Tom Hammond's Spectrogram
> writeups in the article.
>
> 73,
> Don W3FPR
>
> > -----Original Message-----
> >
> > Hi Tom and others who could help,
> > You were very helpfull several months ago and I'm hoping you
> > can help me again. I just installed the 100 watt option and I've
> > made two contacts on CW. One on 80 meters and the other on 40
> > meters. But I seem to be transmitting 1.01 khz down from my
> > recieve. Is this a filter alignment problem or is there an
> > electrical problem like with a toroid or something.
> > Thanks,
> > Roland in Stockton
> >
>