K2's and switching power supplies

[Tim Logan]

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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[Bob Nielsen]

On Jan 6, 2007, at 1:14 PM, Tim Logan wrote:

> 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

It depends on the supply.  Some are much quieter than others.  The  
ARRL ran some tests a few years back and the results are available to  
members on their web site.

I use an Alinco DM-330 and haven't had any problems.  Likewise with  
my MFJ-4103, which I use for travelling.

Bob, N7XY
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[Tim Logan]

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" <[hidden email]>
> To: <[hidden email]>
> 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
>> _______________________________________________
>> Elecraft mailing list
>> Post to: [hidden email]
>> You must be a subscriber to post to the list.
>> Subscriber Info (Addr. Change, sub, unsub etc.):
>> http://mailman.qth.net/mailman/listinfo/elecraft
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>> Elecraft web page: http://www.elecraft.com
>>
>
>

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[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" <[hidden email]>
To: <[hidden email]>
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" <[hidden email]>
>> To: <[hidden email]>
>> 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
>>> _______________________________________________
>>> Elecraft mailing list
>>> Post to: [hidden email]
>>> You must be a subscriber to post to the list.
>>> Subscriber Info (Addr. Change, sub, unsub etc.):
>>> http://mailman.qth.net/mailman/listinfo/elecraft
>>> Help: http://mailman.qth.net/subscribers.htm
>>> Elecraft web page: http://www.elecraft.com
>>>
>>
>>
>
>

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