[Elecraft] Power supply for KX3

[Rich WC3T]

I have used a Samlec 1223 with no RF noise apparent.  And as for the Astrons that we all regret losing, those are linear analog and don’t do the noise thing.  :)

> On Oct 8, 2021, at 20:49, Jim Brown <jim at audiosystemsgroup.com> wrote:
> 
> 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
> 
> 
> 
> 
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