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Re: [KX3] Audio going low when tuning towards a strong station - SOLVED

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Wouter Jan Ubbels

Re: [KX3] Audio going low when tuning towards a strong station - SOLVED

Hi all,

Many tanks to all who responded, after disabling VFO NR, the problem went
away! Thanks VK2RQ for the pointer.
I tried it out while listening to the LZ contest on 15m today, tuning
across the many contest stations in CW sounds so much better with VFO NR
OFF compared to VFO NR ON, the latter causes a ¨hickup¨ with audio going
low at every strong signal I tune across. Band noise is high enough at the
moment to mask the KX3 VFO tuning noise so no need to enable VFO NR.
Still, I plan to do the tuning noise mod on the KXFL3 as soon as I can find
some time to do it.

73,

Wouter Jan PE4WJ

On Wed, Nov 19, 2014 at 9:18 PM, Matt VK2RQ <[hidden email]> wrote:

> Have you got VFO NR enabled? Not sure, but maybe this is causing the
> effect you are observing.
>
> If you turn VFO NR off, and get "tuning noise", then take a look at this
> application note:
> http://www.elecraft.com/manual/KX3%20Tuning%20Noise%20Mod%20rev%20B3.pdf
>
> If you have the latest firmware, then enabling RX SHFT=8kHz no longer
> prevents you from using Dual Watch feature, although it will prevent use of
> the roofing filter. As you get experience with the radio you'll work out
> the optimum settings under various conditions.
>
> 73, Matt VK2RQ.
>
>
> > On 20 Nov 2014, at 2:15 am, Wouter Jan Ubbels <[hidden email]>
> wrote:
> >
> > Hi all,
> >
> > Whenever I tune my KX3 and there is a strong station nearby, the audio
> goes
> > low, it sort of sounds like the receiver is being blocked by the strong
> > station, or the gain is reduced automatically. As I stop tuning, the
> audio
> > comes back up to the original level.
> > I tried switching off the AGC which was the first thing that came to
> mind,
> > but the behaviour stays the same.
> > I am using DSP firmware rev 1.30 and MCU firmware rev 2.23, and have the
> > roofing filter installed.
> > Any clues as to what I may be seeing with this otherwise great rig?
> >
> > 73,
> >
> > Wouter Jan Ubbels PE4WJ
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>

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pa0pje

Re: [KX3] Audio going low when tuning towards a strong station - SOLVED

Dag Wouter Jan,

Mooi dat je het hebt gevonden!

Ik heb die KXFL3-mod wel uitgevoerd dus ik kon je probleem niet
reproduceren...

Ok wat de PA-beker betreft, ik heb je dus helaas gemist. Ik gebruikte
wel de techniek die jij ook hebt geprobeerd maar met QRP kun je beter
zoeken dan roepen, ik heb misschien twee QSO's gemaakt door CQ te
roepen, verder heb ik steeds gezocht en op het laatst zelfs een paar
keer een call ingetikt in de AYQ software om te zien of ik die al had.
Meestal wel dus. Nou we zien wel weer wat het oplevert, ik denk niet dat
ik nog 's 2x tweede in de QRP-sectie wordt, zoals vorig jaar...

Succes met modificeren!

73,
Peter - PA0PJE

Op 23-11-14 om 11:08 schreef Wouter Jan Ubbels:

> Hi all,
>
> Many tanks to all who responded, after disabling VFO NR, the problem went
> away! Thanks VK2RQ for the pointer.
> I tried it out while listening to the LZ contest on 15m today, tuning
> across the many contest stations in CW sounds so much better with VFO NR
> OFF compared to VFO NR ON, the latter causes a ¨hickup¨ with audio going
> low at every strong signal I tune across. Band noise is high enough at the
> moment to mask the KX3 VFO tuning noise so no need to enable VFO NR.
> Still, I plan to do the tuning noise mod on the KXFL3 as soon as I can find
> some time to do it.
>
> 73,
>
> Wouter Jan PE4WJ
>
>
> Hoi Peter,
>
> Leuk van je te horen! Hoorde je nog in de PA beker contest maar heb je niet
> kunnen werken (je werkte een ander station wat op die frequentie CQ gaf, ik
> ging iets ernaast CQ geven maar je hebt me gemist denk ik:)
>
> Nee de noise blanker staat uit. Maar, VK2RQ suggereerd dat het misschien de
> VFO noise reduction (VFO NR) is, ik kijk vanavond even of ik die aan heb
> staan.
>
> 73,
>
> Wouter Jan PE4WJ