VFO NR

[Sean Hayden]

Hi all,

I have a new to me KX3 that produces VFO dial noise on a few bands.  I see
there is a VFO NR option enabled in tech mode, but the setting is locked
and pressing the freq ent button for 3 seconds doesn't do anything (other
than beep twice).  The serial number of the unit is 968.  I have updated
the firmware to the latest version.

Thanks,
Sean
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[Detrick Merz]

Maybe you're pushing the wrong button. When I tried this myself, I first
tried to use the 'freq ent' button (because, after all, the radio tells you
'to unlock, hold freq for 3 sec' and that's the only 'freq' button I see).
But here's the trick: hold the RATE(KHZ) button. It should unlock. Don't
ask how I figured this out.

I forget what all (and expect someone else on the list will fill in), but
there were some updates made after those earlier serial numbers. I think
some of those updates can be applied to the older models, but not sure if
all can. I *am* curious to hear whether the VFO NR helps you or not, and
also curious to hear if your radio can be brought up to the current spec.

gl es 73,

-detrick
K4IZ

On Fri, Jul 6, 2018 at 6:07 PM, Sean Hayden <[hidden email]> wrote:

> Hi all,
>
> I have a new to me KX3 that produces VFO dial noise on a few bands.  I see
> there is a VFO NR option enabled in tech mode, but the setting is locked
> and pressing the freq ent button for 3 seconds doesn't do anything (other
> than beep twice).  The serial number of the unit is 968.  I have updated
> the firmware to the latest version.
>
> Thanks,
> Sean
> ______________________________________________________________
> 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]
>

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[Elecraft mailing list]

 Re:  "But here's the trick: hold the RATE(KHZ) button. It should unlock. Don'task how I figured this out."


It is in the Owners Manual at the top of the "Menu Functions" table.  Page 35 in manual revisions B5 thru C5.  It says:

"To change any tech-mode parameter, you must first unlock it by holding KHZ for about 3 seconds.  This turns off the lock symbol."

If you have the optional KXFL3 filter board installed, it can be the source of much of the tuning noise on the early serial number units.  A simple mod to the roofing filter board is described here:

http://www.elecraft.com/manual/KX3%20Tuning%20Noise%20Mod%20rev%20B3.pdf


I highly recommend that mod.  Before I did it, I could not hear any signals while tuning across the band on 28mhz and higher.  It is simple, and probably took me less than 15 minutes.  It eliminated almost all the tuning noise on my s/n 3500 KX3.

Mark,
KE6BB


   
 
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