[Elecraft] Power supply for KX3

[Jim Brown]

On 10/8/2021 4:14 PM, QRP5W at roadrunner.com wrote:
> The ubiquitous Radio Shack 22-124A (and its variants) power supply is
> a perfect match for the KX-3. Manufactured by the millions and cheaper
> than dirt on that watery place or under hamfest tables it meets the
> current-handling needs of the KX-3.

I don't see comments on the elephant in the room -- most commercial 
power supplies dump out lots of RF noise, both from their switch-mode 
operation and their regulation circuitry. I would be VERY suspicious of 
any such unit not specifically marketed to hams for use on the HF bands.

The ProAudioEng PSU is quiet for the low current needed for receive, but 
is noisy at the higher current of transmit. No problem if you're using 
only one radio at a time, but bad news if you're listening on a second 
radio tuned to another band while transmitting. It may be possible to 
quiet that noise with ferrite chokes. I have one of these PSUs, but 
haven't tried to choke it.

73, Jim K9YC