[Elecraft] KPA500 - linear power supply

[Lee Buller]

A couple of years ago, I looked hard at the THP amps at Dayton.  They were using 
linear supplies as well.  If I remember right, the PS voltage was 60 volts no 
load...and 48 volts under full power.

I think there might be a cost issue here as well.  Less parts for a non 
switching power supply...less complexity too....and field repairable as well.

Lee - K0WA


 In our day and age it seems that Common Sense is in short supply.  If you don't 
have any Common Sense - get some Common Sense and use it.  If you can't find any 
Common Sense, ask for help from somebody who has some Common Sense.  Is Common 
Sense divine?

Common Sense is the image of the Creator expressing revealed truth in my mind. 
-  John W. (Kansas)






________________________________
From: Johnny Siu <vr2xmc at yahoo.com.hk>
To: F5vjc <foxfive.vjc at gmail.com>; Henk Remijn PA5KT <pa5kt at remijn.net>
Cc: "elecraft at mailman.qth.net" <elecraft at mailman.qth.net>
Sent: Wed, May 11, 2011 8:39:10 AM
Subject: [Elecraft] KPA500 - linear power supply

I notice KPA500 is using a linear power supply.  The technology of switching 
power supply is now very mature.  Is there any reason why linear PSU is used 
instead of switching PSU in KPA500?  I just think a switching PSU will make 
KPA500 more lighter and the linearity of the amplifier will not be affected by 
fluctuation in supply voltages.
 
A lighter KPA500 will make it more portable for Dxpedition.  My questions may be 
discussed somewhere in the past.
 
Any advice?

TNX & 73,


Johnny VR2XMC

從︰ F5vjc <foxfive.vjc at gmail.com>
收件人︰ Henk Remijn PA5KT <pa5kt at remijn.net>
副本(CC)︰ elecraft at mailman.qth.net
傳送日期︰ 2011年05月11日 (週三) 9:26 PM
主題︰ Re: [Elecraft] KPA500 - stacking possibilites

As the KPA 500 uses a linear PSU there obviously is a mains
transformer within the cabinet.
I know this is a toroidal type transformer, which is good, but can we
assume that placement of the Amp with respect to the K3 is non
critical, for magnetic hum coupling.

How immune is the K3 to this effect? Has placement of the KPA 500
w.r.t. the K3 been tested  for any ill effects?

73, Deni
F5VJC
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