12 bit Time and Frequency Domain K3/Alpha 9500 Screen Shot

[John Seney]

Season's Greetings Elecrafters:

This weekend I had a QSO with a West coast station that related that he was
having some TVI issues with a neighbor and that to help reduce it, he had purchased
a low pass filter. That got me to thinking - where is my harmonic energy these
days running a K3 and Alpha 9500?

So I hooked up a 12 bit scope and used a probe as an antenna and sampled the RF
with key down on 20 meters to get a sense for how close I might be to a
neighborhood revolt. I've had no complaints so far.

The screen shot tells the story at  http://www.wd1v.net

Wishing you a peaceful and delightfully attenuated harmonic season!

73,

John - WD1V
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[John Seney]

>
>
> Season's Greetings Elecrafters:
>
> This weekend I had a QSO with a West coast station that related that he was
> having some TVI issues with a neighbor and that to help reduce it, he had purchased
> a low pass filter. That got me to thinking - where is my harmonic energy these
> days running a K3 and Alpha 9500?
>
> So I hooked up a 12 bit scope and used a probe as an antenna and sampled the RF
> with key down on 20 meters to get a sense for how close I might be to a
> neighborhood revolt. I've had no complaints so far.
>
> The screen shot tells the story at  http://www.wd1v.net
>
> Wishing you a peaceful and delightfully attenuated harmonic season!
>
> 73,
>
> John - WD1V

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[picmaster]

Hi John,

These peaks could be nonlinearities from your scope amplifier.

73,
Nikolay / LZ1NRD


----- Цитат от John Seney ([hidden email]), на 25.11.2012 в 22:13 -----

> Season's Greetings Elecrafters:
>
> This weekend I had a QSO with a West coast station that related that he was
> having some TVI issues with a neighbor and that to help reduce it, he had purchased
> a low pass filter. That got me to thinking - where is my harmonic energy these
> days running a K3 and Alpha 9500?
>
> So I hooked up a 12 bit scope and used a probe as an antenna and sampled the RF
> with key down on 20 meters to get a sense for how close I might be to a
> neighborhood revolt. I've had no complaints so far.
>
> The screen shot tells the story at  http://www.wd1v.net
>
> Wishing you a peaceful and delightfully attenuated harmonic season!
>
> 73,
>
> John - WD1V
> ______________________________________________________________
> 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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[WB4SON]

That's pretty sweet, 3rd harmonic being the worst and greater than 60 dB
down.  I like your Amp and the K3 driving it!

Times like this, with great propagation, make me think... 1000 watt carrier
with a 3rd harmonic 60 dB down says that harmonic is 1 mW.  I've had
reliable communication with Australia at 250 mW when the propagation is
favorable.  How far will 1 mW go?

Just thinking, not complaining.  I think the FCC requirement is 43 dB down
and you are MUCH better than that!

73, Bob, WB4SON
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[Rick WA6NHC]

Quick answer: Just as far but success is determined by the received noise
threshold and the ability to minimize it.  THAT'S why we use Elecraft.  ;-)

Rick wa6nhc

-----Original Message-----
From: Bob

How far will 1 mW go?

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