K3 K144XV spurious signal on 144,414.1

[Sverre Holm (LA3ZA)]

I would appreciate it if other owners of the K3-K144XV would check for this signal.

It appears as if it is a regular input signal, i. e. it tunes normally. But it is still there even if the 2m antenna is disconnected or the input is shorted, so it seems to be internally generated.

I have tried all the tricks I know such as moving of internal cables in the K3. I also updated the K144XV firmware and that got rid of the spur at the 36th harmonic of the 4 MHZ K144XV processor crystal at 144,005.

But the 144,414.1 spur remains, close to the SK4MPI beacon at 144,412 which is one of the main indicators of propagation here.

[David Pratt]

Yes, Sverre, something similar here, but in my case the frequency is 144411.09 kHz which is even closer to your beacon.  I think this requires a response from Wayne, Paul or Ron, etc.

73 de David G4DMP


David Pratt on his Asus Nexus 7 tablet.
On 19 Apr 2015 08:25, "Sverre Holm (LA3ZA)" <[hidden email]> wrote:

>
> I would appreciate it if other owners of the K3-K144XV would check for this
> signal.
>
> It appears as if it is a regular input signal, i. e. it tunes normally. But
> it is still there even if the 2m antenna is disconnected or the input is
> shorted, so it seems to be internally generated.
>
> I have tried all the tricks I know such as moving of internal cables in the
> K3. I also updated the K144XV firmware and that got rid of the spur at the
> 36th harmonic of the 4 MHZ K144XV processor crystal at 144,005.
>
> But the 144,414.1 spur remains, close to the SK4MPI beacon at 144,412 which
> is one of the main indicators of propagation here.

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[Sverre Holm (LA3ZA)]

Good to hear that others are hearing it as well, so then it is for sure nothing that radiates in our shack. I've heard of two now, at 144,411.09 MHz and 144,414.8 MHz respectively.

What we found at our club station's K3 was:
- it cannot be heard on the 28 MHz band which is where the 2m band is downmixed to, on 28,414.1 in our case
- the signal goes through the first mixer as its pitch will change (a lot) if the 116 MHz crystal in the K144XV is subjected to a coolant spray

[Pierfrancesco Caci]

>>>>> "Sverre" == Sverre Holm (LA3ZA) <[hidden email]> writes:


    Sverre> Good to hear that others are hearing it as well, so then it
    Sverre> is for sure nothing that radiates in our shack. I've heard
    Sverre> of two now, at 144,411.09 MHz and 144,414.8 MHz
    Sverre> respectively.

I have them on 144416.521 and 144417.464 (frequency determined by pressing
SPOT while in FINE mode). They don't seem to be my usual ethernet
carriers.


--
Pierfrancesco Caci, ik5pvx
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[Fausto Coletti]

If you put a 144 MHz prtable receiver close to the K3 you can listen this
spurious
and also some other weaker spurious (S2-S3).
If you disconnect the supply at the K144XV the spurious do not disappear.
It is a lot that I'm investigating the origin of these spurious but I have
not found where
they come from.

73, Fausto IK4NMF

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[Sverre Holm (LA3ZA)]

Yes, you're right. The squelch opens in my FM HT when it is set at 144,415 and brought near the K3. This comes from my K3 without a K144XV, so it is independent of the 2m transverter.

Fausto Coletti wrote

If you put a 144 MHz prtable receiver close to the K3 you can listen this spurious

[Fausto Coletti]

Hi Sverre,
there is not only the signal at 144 415 that is the stongest spurious
signal, if you listen
across the band, you'll find many spurious signals about every 6 KHz.
These have less intensity, but they are quite annoying if you use the radio
to
hear very weak signals such as during the EME activity.

73, Fausto IK4NMF



----- Original Message -----
From: "Sverre Holm (LA3ZA)" <[hidden email]>
To: <[hidden email]>
Sent: Monday, April 20, 2015 12:35 AM
Subject: Re: [Elecraft] K3 K144XV spurious signal on 144,414.1

> Yes, you're right. The squelch opens in my FM HT when it is set at 144,415
> and brought near the K3. This comes from my K3 without a K144XV, so it is
> independent of the 2m transverter.
>
>
> Fausto Coletti wrote
>> If you put a 144 MHz prtable receiver close to the K3 you can listen this
>> spurious
>
>
>
>
>
> -----
> Sverre, LA3ZA
>
> K2 #2198, K3 #3391,
> LA3ZA Blog: http://la3za.blogspot.com,
> LA3ZA Unofficial Guide to K2 modifications:
> http://la3za.blogspot.com/p/la3za-unofficial-guide-to-elecraft-k2.html
> --
> View this message in context:
> http://elecraft.365791.n2.nabble.com/K3-K144XV-spurious-signal-on-144-414-1-tp7601496p7601529.html
> Sent from the Elecraft mailing list archive at Nabble.com.
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