Re: W6JHB KX3 Clicking

[Jim Bennett]

Hi Howard -

Yes, I see there were a couple replies since I initially posted. One poster notes that it is a "known issue", and that's only partly comforting - at least someone is aware of it and hopefully working on resolution. Another sez his is only with headphones inserted. Mine does it with and without headphones. And yes, turning down the AF gain reduces the clicking, but it has to be turned down so far that I cannot hear the other station(s) - not a useful solution. With headphones removed, there is no clicking at AF level 12. But, with the built-in speaker I can't hear anything except for the monitor tone. Turning AF gain to about 30 or more allows me to hear signals on the band, but the clicking is there. With headphones inserted, the clicking is quite obvious down to AF level 2. At level 1 is is gone. If I turn off VOX and key my paddle, there is no RF sent, but the clicking is still there, so it has nothing to do with RF being sent. Something in the T/R circuitry, methinks. Unti
 l the engineers can get it corrected, I can use the rig w/o VOX (manual transmit) to avoid the annoying clicking.

Jim


On   Monday, Dec 30, 2013, at  Monday, 8:48 AM, Howard K6IA Elecraft Support wrote:

> Jim,
> I see that this was answered for you on the reflector.
> I have passed your message onto the Engineering team for their review.
>
> Regards
> Howard K6IA
> ----------
> 73,  Howard Stephenson  K6IA
> Elecraft Customer Support
> [phone] EXT 169
> ----------
> On 12/29/2013 7:17 PM, Jim Bennett wrote:
>> I posted this on the reflector on Sunday afternoon and no replies from anyone in the group, so I'm turning to you folks.
>>
>> "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 Bennett / W6JHB
>> 224 American River Canyon Dr.
>> Folsom, CA 95630-7409
>>
>> [hidden email]
>>
>> Web: http://www.w6jhb.com
>>
>> Being retired doesn't mean I'm not part of the work force - just that I'm not forced to work!
>>
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>

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[wayne burdick]

Hi Jim,

This is something we hope to minimize in a future firmware release. Meanwhile, here are some things you can try:

- cut the lowest 3 audio receive equalization bands by a significant amount in CW mode (RX EQ menu entry)
- reduce the receiver's DSP bandwidth in CW mode (try 100-300 Hz)
- use a non-zero QSK delay
- turn on the noise blanker and setting it to a low level
- turn on the noise reduction and setting it to a low level
- use headphones with less bass response

The T/R artifact you're hearing is usually a result of using headphones with extremely low bass response in combination with one or more of the following:  low supply voltage, high transmit current into a low-Z load, and very high band noise.

73,
Wayne
N6KR


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