Just spent an hour or so working with Howard and Wayne at Elecraft trying to 
nail this down. I tried various things, including adjusting the lower three 
audio equalization bands, using a lower NR setting, setting the receive 
bandwidth to 100-300 Hz, setting NB on at a low setting, and using a non-zero 
QSK delay. In my situation, there was but one thing that just about completely 
eliminated this clicking: turning OFF the NR. With it turned on, at level 1, 
the clicking was ugly. Increasing it up to 9 or 10 helped a little, but lowered 
receive volume too much. Turning NR off stopped my clicks.

This may or may not help with YOUR particular rig's key click problems, but it 
fixed mine until they have a firmware resolution.

Thanks to the guys at Elecraft for their continued excellent support!!

Happy New Year to all, and may 2014 bring you the goodies on your wish list. (I 
already got mine - KX3, KPA500, & KAT500), so I'm pretty much outta luck this 
coming year!!! :-)

73, Jim / W6JHB
Folsom, CA



On   Monday, Dec 30, 2013, at  Monday, 12:53 AM, Hjalmar Duklæt wrote:

> Yes, this is a known issue. Try to turn down the AF gain when keying. That 
> will make it much better.
> 73 de Hal
> la43xx
> 
> On 13-12-30, Klaus Koppendorfer <[email protected]> wrote:
>> 
>> that is what we had several times told to elecraft, qsk on kx3 is bad, 
>> you can read this also at bob sherwood
>> 
>> ________________________________________
>> Von: [email protected] [[email protected]]" im 
>> Auftrag von "Jim Bennett [[email protected]]
>> Gesendet: Montag, 30. Dezember 2013 01:26
>> An: Elecraft Reflector Reflector
>> Betreff: [Elecraft] KX3 Headphone Clicks
>> 
>> Hi All - just this past weekend completed building KX3 # 5539. Seems to work 
>> fine except for one thing. When I've got headphones plugged in and running 
>> full break-in I'm hearing a fairly strong clicking noise. I set the rig into 
>> semi-QSK with a 1-second DLY and see that the click is happening when the 
>> radio goes back into receive, NOT when I key it and send RF out into the 
>> ozone. Any idea what's happening here? I've tried it with three different 
>> sets of 'phones: A Sony MDR-V6, a Bose Triport, and an el-cheapo pair of 
>> 'round-the-ear phones that I use with my iPhone at the gym. I hear the same 
>> click on all three. I then unplugged the 'phones and listened to the 
>> built-in speaker with DLY at zero. The clicks are there, too. Very annoying. 
>> Any hints??
>> 
>> Jim / W6JHB
>> 
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