[Elecraft] Neat little switching power supply

[Eric Williams]

Phil Wheeler wrote:

> Eric Williams wrote:
>
>> I picked up a Toshiba laptop switching power supply for my K2 on 
>> ebay.  It's model PA2450U, and has a rated output of 15V 3A.  On the 
>> K2, full-power key-down into a dummy load gives a reading on the 
>> display of 14.1V and 2.5A with a good clean tone.  I paid $20 plus 
>> shipping for it. 
>
> Generally the issue is RFI on receive from these small switchers.  Not 
> such a problem with remote (e.g., coax fed) antennas, but it can be 
> with the sort of wire antennas recommended for the KX1.  Likely the 
> wider bandpass for SWBC listening is another issue.

I put a whip antenna on my IC-R70 a few feet from the Toshiba brick.  I 
can pick up a few signals from the switcher on 80M, but nothing on the 
higher frequency bands.