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New PX3 - question on a signal that doesn't move

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Thorpe, Jeffrey

New PX3 - question on a signal that doesn't move

Probably a dumb question. New to using pan adapters, and just got my PX3 put together.

I hooked it up to my KX3, tuned around on 40m (using a home-brewed AS-2259 NVIS type dual dipole for 40m and 80m) and I get really strong signal indications close to 19khz both above and below the center frequency on the display. It doesn’t matter where I tune in the band. If I adjust the scale, the signals stay at the +/- point of about 19khz. They appear stronger than any other signal in the display.

I am running the KX3 off internal batteries, and the PX3 off a LiFePO4.

Are these signals from something outside being picked up in the cables between the KX3 and PX3, a problem with the PX3, or something else (like, maybe, me)?

Jeff KG7HDZ

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Don Wilhelm

Re: New PX3 - question on a signal that doesn't move

Jeff,

Have you done the Opposite Sideband Nulling (page 26 in the manual).
Make certain the RX IQ plugs are fully seated at both ends.
See Trobleshooting on page 33 in the manual.

73,
Don W3FPR

On 12/22/2017 5:15 PM, Thorpe, Jeffrey wrote:
> Probably a dumb question. New to using pan adapters, and just got my PX3 put together.
>
> I hooked it up to my KX3, tuned around on 40m (using a home-brewed AS-2259 NVIS type dual dipole for 40m and 80m) and I get really strong signal indications close to 19khz both above and below the center frequency on the display. It doesn’t matter where I tune in the band. If I adjust the scale, the signals stay at the +/- point of about 19khz. They appear stronger than any other signal in the display.
>
> I am running the KX3 off internal batteries, and the PX3 off a LiFePO4.
>
> Are these signals from something outside being picked up in the cables between the KX3 and PX3, a problem with the PX3, or something else (like, maybe, me)?
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Thorpe, Jeffrey

Re: New PX3 - question on a signal that doesn't move

Nope - didn’t get that far in the manual. I was just too excited to read any more.
Looks like those parts address my question pretty well. Thank-you much Don.

Jeff - KG7HDZ

> On Dec 22, 2017, at 3:35 PM, Don Wilhelm <[hidden email]> wrote:
>
> Jeff,
>
> Have you done the Opposite Sideband Nulling (page 26 in the manual).
> Make certain the RX IQ plugs are fully seated at both ends.
> See Trobleshooting on page 33 in the manual.
>
> 73,
> Don W3FPR
>
>> On 12/22/2017 5:15 PM, Thorpe, Jeffrey wrote:
>> Probably a dumb question. New to using pan adapters, and just got my PX3 put together.
>> I hooked it up to my KX3, tuned around on 40m (using a home-brewed AS-2259 NVIS type dual dipole for 40m and 80m) and I get really strong signal indications close to 19khz both above and below the center frequency on the display. It doesn’t matter where I tune in the band. If I adjust the scale, the signals stay at the +/- point of about 19khz. They appear stronger than any other signal in the display.
>> I am running the KX3 off internal batteries, and the PX3 off a LiFePO4.
>> Are these signals from something outside being picked up in the cables between the KX3 and PX3, a problem with the PX3, or something else (like, maybe, me)?

Bob N3MNT

Re: New PX3 - question on a signal that doesn't move

X2 on check the plugs from Kx3 to PX3 This will happen if they aren't all the
way in.

--
Sent from: http://elecraft.365791.n2.nabble.com/
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Thorpe, Jeffrey

Re: New PX3 - question on a signal that doesn't move

In reply to this post by Don Wilhelm

Ok - finished doing the Opposite Sideband Nulling. (Also made sure the plugs were seated properly.)

The signals still show on the PX3 display, but not as strongly.
I’ve checked it on all bands and each band has at least one of these signals, some have up to six showing (with span set to 50.)
The placement of the signals is not the the same from band to band, however no signal is less than 12khz from the center frequency. Again, tuning up or down within the band does not affect the displayed signal.

Any ideas?

Jeff - kg7hdz

Dale Boresz

Re: New PX3 - question on a signal that doesn't move

Jeff,

Do you by chance have ATTN on the KX3 engaged? If so, turn it off, and turn
on the PREamp on the KX3. That should eliminate the peaks in the PX3 that
you are seeing.

73,

Dale - WA8SRA

On Fri, Dec 29, 2017 at 4:07 PM, Thorpe, Jeffrey <[hidden email]>
wrote:

> Ok - finished doing the Opposite Sideband Nulling. (Also made sure the
> plugs were seated properly.)
>
> The signals still show on the PX3 display, but not as strongly.
> I’ve checked it on all bands and each band has at least one of these
> signals, some have up to six showing (with span set to 50.)
> The placement of the signals is not the the same from band to band,
> however no signal is less than 12khz from the center frequency. Again,
> tuning up or down within the band does not affect the displayed signal.
>
> Any ideas?
>
> Jeff - kg7hdz
>
> > On Dec 22, 2017, at 3:35 PM, Don Wilhelm <[hidden email]> wrote:
> >
> > Jeff,
> >
> > Have you done the Opposite Sideband Nulling (page 26 in the manual).
> > Make certain the RX IQ plugs are fully seated at both ends.
> > See Trobleshooting on page 33 in the manual.
> >
> > 73,
> > Don W3FPR
> >
> >> On 12/22/2017 5:15 PM, Thorpe, Jeffrey wrote:
> >> Probably a dumb question. New to using pan adapters, and just got my
> PX3 put together.
> >> I hooked it up to my KX3, tuned around on 40m (using a home-brewed
> AS-2259 NVIS type dual dipole for 40m and 80m) and I get really strong
> signal indications close to 19khz both above and below the center frequency
> on the display. It doesn’t matter where I tune in the band. If I adjust the
> scale, the signals stay at the +/- point of about 19khz. They appear
> stronger than any other signal in the display.
> >> I am running the KX3 off internal batteries, and the PX3 off a LiFePO4.
> >> Are these signals from something outside being picked up in the cables
> between the KX3 and PX3, a problem with the PX3, or something else (like,
> maybe, me)?
> ______________________________________________________________
> 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
> Message delivered to [hidden email]
>

Thorpe, Jeffrey

Re: New PX3 - question on a signal that doesn't move

Thanks everyone for the responses.
Also found a post from a few years back that talked about this too (from Don I think referencing Wayne). Puts my mind to rest. I was worried that I may have messed up my assembly, but it turns out that this thing is so sensitive that it can hear/interfere with itself!
Kind of like the ringing in my ears.

Jeff - kg7hdz

On Dec 29, 2017, at 7:21 PM, Dale Boresz <[hidden email]<mailto:[hidden email]>> wrote:

Jeff,

Do you by chance have ATTN on the KX3 engaged? If so, turn it off, and turn on the PREamp on the KX3. That should eliminate the peaks in the PX3 that you are seeing.

73,

Dale - WA8SRA

On Fri, Dec 29, 2017 at 4:07 PM, Thorpe, Jeffrey <[hidden email]<mailto:[hidden email]>> wrote:
Ok - finished doing the Opposite Sideband Nulling. (Also made sure the plugs were seated properly.)

The signals still show on the PX3 display, but not as strongly.
I’ve checked it on all bands and each band has at least one of these signals, some have up to six showing (with span set to 50.)
The placement of the signals is not the the same from band to band, however no signal is less than 12khz from the center frequency. Again, tuning up or down within the band does not affect the displayed signal.

Any ideas?

Jeff - kg7hdz

> On Dec 22, 2017, at 3:35 PM, Don Wilhelm <[hidden email]<mailto:[hidden email]>> wrote:
>
> Jeff,
>
> Have you done the Opposite Sideband Nulling (page 26 in the manual).
> Make certain the RX IQ plugs are fully seated at both ends.
> See Trobleshooting on page 33 in the manual.
>
> 73,
> Don W3FPR
>
>> On 12/22/2017 5:15 PM, Thorpe, Jeffrey wrote:
>> Probably a dumb question. New to using pan adapters, and just got my PX3 put together.
>> I hooked it up to my KX3, tuned around on 40m (using a home-brewed AS-2259 NVIS type dual dipole for 40m and 80m) and I get really strong signal indications close to 19khz both above and below the center frequency on the display. It doesn’t matter where I tune in the band. If I adjust the scale, the signals stay at the +/- point of about 19khz. They appear stronger than any other signal in the display.
>> I am running the KX3 off internal batteries, and the PX3 off a LiFePO4.
>> Are these signals from something outside being picked up in the cables between the KX3 and PX3, a problem with the PX3, or something else (like, maybe, me)?

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