[K2] K2's frequency counter cable with KPA100 installed

[K1FFX]

Page 55 of the KPA100 manual recommends removing the K2's frequency counter cable
when the KPA100 is installed, since leaving the cable in "may" cause an increase in the
amplitude of spurious signals.

Since the manual says "may" and I'd really like to leave the cable in, what are people's
experience with this?  Do you hear a notice-able increase in spurious signal amplitude?

If the answer really is "yes, remove the cable", is there any other way, short of
disassembling the K2/100 and inserting the cable, to align the K2's filters?

Thanks!

- Bruce

[Vic K2VCO]

The third harmonic of the BFO appears around 14.4 MHz, if I'm not mistaken. I did notice
an increase in the level of this spurious output on 20 meters when the cable was inserted.
I didn't measure it or anything -- but it was louder.

Someone with appropriate test equipment might be persuaded to measure it, but of course it
might vary from K2 to K2.

On 1/26/2011 2:44 PM, K1FFX wrote:

>
> Page 55 of the KPA100 manual recommends removing the K2's frequency counter
> cable
> when the KPA100 is installed, since leaving the cable in "may" cause an
> increase in the
> amplitude of spurious signals.
>
> Since the manual says "may" and I'd really like to leave the cable in, what
> are people's
> experience with this?  Do you hear a notice-able increase in spurious signal
> amplitude?
>
> If the answer really is "yes, remove the cable", is there any other way,
> short of
> disassembling the K2/100 and inserting the cable, to align the K2's filters?
>
> Thanks!
>
> - Bruce
>
>
> -----
> Bruce Rosen
> K1FFX
>

--
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/
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[Don Wilhelm-4]

  Bruce,

Remove the cable.  You will not hear those spurious signals, they are
transmitted ones.
It would be OK to store the cable inside the K2 and connected to the
plug on the control board, but you need to be sure the other end does
not make contact with the circuit parts.  Tom Hammond fashioned a clip
to hold the end of the cable secure at the rear of the left side panel.  
If that interests you, I think you can find information at www.n0ss.net.

Yes, you will need to remove the KPA100 to change the filters, but you
should not have to do that often once they are set up correctly, they
will stay put.  If you have just been experimenting with the filters. I
suggest you get a copy on Spectrogram and set the filters up once and
for all.  You can find Spectrogram and setup and "how-to" information at
Tom's website too.  I have additional information in the K2 Dial
Calibration article at my website www.w3fpr.com that may help you as well.

73,
Don W3FPR

On 1/26/2011 5:44 PM, K1FFX wrote:

> Page 55 of the KPA100 manual recommends removing the K2's frequency counter
> cable
> when the KPA100 is installed, since leaving the cable in "may" cause an
> increase in the
> amplitude of spurious signals.
>
> Since the manual says "may" and I'd really like to leave the cable in, what
> are people's
> experience with this?  Do you hear a notice-able increase in spurious signal
> amplitude?
>
> If the answer really is "yes, remove the cable", is there any other way,
> short of
> disassembling the K2/100 and inserting the cable, to align the K2's filters?
>
> Thanks!
>
> - Bruce
>

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[Bill Coleman-2]

On Jan 26, 2011, at 5:44 PM, K1FFX wrote:

> Page 55 of the KPA100 manual recommends removing the K2's frequency counter
> cable
> when the KPA100 is installed, since leaving the cable in "may" cause an
> increase in the
> amplitude of spurious signals.
>
> Since the manual says "may" and I'd really like to leave the cable in, what
> are people's
> experience with this?  Do you hear a notice-able increase in spurious signal
> amplitude?
>
> If the answer really is "yes, remove the cable", is there any other way,
> short of
> disassembling the K2/100 and inserting the cable, to align the K2's filters?

I only did this once, and yes, I noticed more spurious signals.

You don't have to disassemble much to align the filters. Just enough to take the top off and flip it over beside the rest of the unit. And this isn't something you need to do frequently -- and usually then only because you did something else to the K2/100, in which case you'll have the top off anyway....


Bill Coleman, AA4LR, PP-ASEL        Mail: [hidden email]
Web: http://boringhamradiopart.blogspot.com
Quote: "Not within a thousand years will man ever fly!"
            -- Wilbur Wright, 1901

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