[Elecraft] very small 20A switching PS

[Johnny Siu]

Hello Lewis,

Please keep the group infomed about your findings.  PSU at this package is usually much cheaper.  However, the problem is always the RFI especially below 40m.

Tune the rig to the 40, 80 and 160m, you will notice noise from the PSU if there is RFI.  Switching power supply itself is not an evil but well shielded and designed unit without RFI (or at least not noticeable) could be a bit costy.

73

Johnny VR2XMC
 

________________________________
 寄件人︰ Lewis Phelps <lew at n6lew.us>
收件人︰ "elecraft at mailman.qth.net List" <elecraft at mailman.qth.net> 
傳送日期︰ 2014年09月25日 (週四) 8:01 AM
主題︰ Re: [Elecraft] very small 20A switching PS
  

In the “small power supply” department, I recently grabbed a surplus unit on sale at all electronics.com.  It measures a scant 1.5 x 3 x 12 (if you remove a handle) and puts out 45 amps at 12VDC plus 3.1 amps at 3.3 VDC.

And the cost is only $24.  Downside:  probably produces too much RF noise to be useful. I haven’t had a chance to test it yet, but it’s rated as ENC 55022 Class A, which basically means it’s not rated for residential use.  whether it will work OK in a ham radio application remains to be seen. I’ll report more when I know.  It’s designed to run rack mounted equipment.
It also requires some ingenuity in connecting its output to the station, since it uses an output connector that is …ummm… unusual in the ham radio environment.

But if it works, it offers great bang for the buck.

see:

http://www.allelectronics.com/make-a-store/item/ps-2545/12-vdc-45a-3.3-vdc-3a-power-supply/1.html

Lew N6LEW





On Sep 22, 2014, at 4:27 AM, Ignacy <no9e at arrl.net> wrote:

> HPS1-A required reducing power in my K3 to about 60W. It works well with
> IC-7000 because this rig folds power with lower voltage. For me, HPS
> advantages are light weight and automatic 110/220C switching. 
> 
> It failed once under  light service. 
> 
> Ignacy, NO9E