[Elecraft] K2's and switching PS - noise

[David Cutter]

I notice some versions of switching supplies (probably for Eu consumption) 
have an additional clamp-on ferrite on the output cable.  Some supplies only 
have terminal posts, but it is a good idea to put a clamp-on ferrite on the 
cable right up to the terminal posts, ideally it should be in a metal box 
attached to the psu, but I haven't done that.

My Simlex is ok on the HF bands where I coax feed the antennas,  but with 
the LF antenna wire coming right into the shack to the matching unit, I 
think noise gets in thro that route.

David
G3UNA


----- Original Message ----- 
From: "Tim Logan" <nz7c at cox.net>
To: <Elecraft at mailman.qth.net>
Sent: Saturday, January 06, 2007 10:33 PM
Subject: [Elecraft] K2's and switching PS - got my answer


> Thanks Frank and others - as luck has it the switching supply I have is
> the 1223 Frank mentioned - all who responded have not had any problems -
> thanks again everyone.
> 73/Tim
> W6NEK wrote:
>
>> Hi Tim,
>> I use the Simplex America Model SEC 1223 on all the K2/K2100's I build
>> with no problems at all.  Handles max current no problem and I have
>> yet to hear any hash generated by the supply in the K2 receiver.
>> Cheap, light weight and small foot print.  It's a very good choice.
>> Reviews here:
>> http://www.eham.net/reviews/detail/432
>>
>> Buy it here for best price:
>> http://www.universal-radio.com/CATALOG/hamps/3747.html
>>
>> Good luck,
>> Frank - W6NEK
>>
>> ----- Original Message ----- From: "Tim Logan" <nz7c at cox.net>
>> To: <elecraft at mailman.qth.net>
>> Sent: Saturday, January 06, 2007 1:14 PM
>> Subject: [Elecraft] K2's and switching power supplies
>>
>>
>>> Hi folks -
>>> I would like to know what experiences anyone has had using switching
>>> power supplies within close proximity of a K2 or K2-100.  I'm
>>> considering building a fifth K2 (keep selling the dang things to
>>> people that don't build) and am toying with the idea of making up a
>>> portable module that would include a switching power supply. Thanks
>>> in advance. 73/Tim NZ7C
>>> _______________________________________________
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>>
>>
>
>


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