[Elecraft] K3 12m problem

[juergen piezo]

Hi Barry

I just updated our clubs K3's and none of them have this problem.  I even checked them into the dummyload.  We have  some early serial K3's and some fairly new ones.

I would use a simple receiver like the Degen and a simple 3 turn loop of about 30mm.  I would  sniff around the K3 and your shack. The K3 for whatever reason seems to be more sensitive to  radiated in-shack emissions. A lot of hash is radiated from the K3's front panel, it just might be a grounding screw thats not making proper contact.

On other radios my LCD monitors cause no problems however the K3 seems to pick up  some minor hash on 80 meters. I have common mode chokes on all the K3's inputs and outputs. It might not be a problem, it just might be that the K3 is so quite you notice every squeak  on the band. On other radios the phase noise might well be hiding all this crud. Its a double edge sword having a very good receiver!

One thing that I have noticed about the K3. Since I am a casual club K3 user  I use the K3's on and off. I have noticed that the receiver seems to be getting "warmer"  much like any old analogue radio. I see no discussions about this. In my opinion the receiver is sounding better than  anything else that I have heard. On early firmware versions the K3's sounded sharp and harsh. However in the last 3 or 4 firmware updates the receivers tone quality seems to be improved. 

It may just be my imagination!???????? 

John

--- On Sat, 10/17/09, Barry Simpson <vk2bj at optusnet.com.au> wrote:

> From: Barry Simpson <vk2bj at optusnet.com.au>
> Subject: [Elecraft] K3 12m problem
> To: elecraft at mailman.qth.net
> Date: Saturday, October 17, 2009, 4:18 PM
> I uploaded the latest beta release
> and found that there is a loud noise
> (like electric motor interference) when tuning at the SSB
> end of 12m. The
> noise stops when you stop tuning.
> 
>  
> 
> I hadn't noticed the problem before so I regressed to the
> previous beta
> version but the noise is still there.
> 
>  
> 
> Has anyone else found this problem ?
> 
>  
> 
> I think I will check the situation with earlier versions.
> 
>  
> 
> 73
> 
>  
> 
> Barry Simpson  VK2BJ
> 
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>