Power supply for KPA100

[John Heaviside]

I am about to embark on final assembly of KPA100 and need a 25A PSU.  I would like to build my own but cannot find a published design.  I could design my own but the cost of a transformer, electrolytics and a heat sink approach the price of commercially available PSUs.  If I get it wrong it is money wasted.  has anyone knowledge of a design and components available in UK?

Alternatively if I buy ready made there are units from about 70 pounds to 150 pounds.  Any recommendations?  The RS 50 mentioned in postings does not seem to be available UK.

John, G3NYX
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[Steven Pituch]

Hi John.

Any of the Astron 35 series.  RS35, VS35M etc. I have a VS35M since abt
1992, and on my KPA100 and it is great.  I think Ian from GB on one of the
reflectors said he just bought one yesterday, so they are available.

Steve

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of John Heaviside
Sent: Saturday, August 20, 2005 4:40 AM
To: elecraft reflector
Subject: [Elecraft] Power supply for KPA100

I am about to embark on final assembly of KPA100 and need a 25A PSU.  I
would like to build my own but cannot find a published design.  I could
design my own but the cost of a transformer, electrolytics and a heat sink
approach the price of commercially available PSUs.  If I get it wrong it is
money wasted.  has anyone knowledge of a design and components available in
UK?

Alternatively if I buy ready made there are units from about 70 pounds to
150 pounds.  Any recommendations?  The RS 50 mentioned in postings does not
seem to be available UK.

John, G3NYX

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[Ron D'Eau Claire-2]

Even a 20-ampere supply is plenty big enough to drive the K2/100 to full
power with current to spare. After all, Elecraft is always conservative in
their recommendations and they spec a 20 amp supply to drive the K2/100.  My
20 amp Astron loafs along with the K2/100 and even supplies power to a few
accessories as well.

You can even run two supplies. Your current low current supply hooked to the
K2 and a heavier duty supply connected to the KPA100 amp. That way the
heavier supply only needs to supply the KPA100. Something in 12-15 amp range
should be plenty big enough. The diodes in the K2 keep the supplies
electrically separate.

Ron AC7AC

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Steven Pituch
Sent: Saturday, August 20, 2005 4:36 AM
To: 'John Heaviside'; 'elecraft reflector'
Subject: RE: [Elecraft] Power supply for KPA100


Hi John.

Any of the Astron 35 series.  RS35, VS35M etc. I have a VS35M since abt
1992, and on my KPA100 and it is great.  I think Ian from GB on one of the
reflectors said he just bought one yesterday, so they are available.

Steve


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[michael taylor-3]

On 8/20/05, John Heaviside <[hidden email]> wrote:
> Alternatively if I buy ready made there are units from about 70 pounds to 150 pounds.  Any recommendations?  The RS 50 mentioned in postings does not seem to be available UK.

I have a SEC-1223 23A Switch Mode Power Supply that I bought from
Waters & Stanton, which is my main home station power supply. It
appears to available for 100 pounds.

I have used it in the UK at 230VAC, and have since modifed it as per
the manufactour's instructions for operation at 120VAC in Canada as
well with no RF hashing or noise problems associated with cheaper
switching power supplies not made for amateur radio use.

-ve3tix
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