[Elecraft] Silent power supply for a K3s

[Dave Cole (NK7Z)]

I found that there is a terminal block inside most Astron Power 
Supplies, that sometimes gets mounted on a painted surface.

I always check all Astron supplies I buy, new or used, to insure the 
paint has been removed under the ground connection of the internal 
terminal block.  In about 50% of the supplies I have seen over the 
years, the TB has been mounted on a painted surface.

73s and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Technical Specialist
ARRL Volunteer Examiner
ARRL Asst. Director, NW Division, Technical Resource

On 6/9/19 7:52 AM, Peter Dougherty wrote:
> Hi all,
> I would like to find a power supply to power the K3s that is completely
> silent. I've owned an Astron RS-35M, which was great until it started
> buzzing like crazy. I swapped that out for a Samlex SEC-1235M, and did the
> fan mod to keep the fan on constantly at low speed. The problem here is that
> when I'm running FT8 or RTTY for more than about a half hour, the fan goes
> into high speed and stays there for an hour or more, long after the rig and
> amp's fans have shut off. And because it's a tiny fan moving a lot of air,
> it's incredibly loud.
> 
> I'm looking for an RF-clean power supply (either linear or switching) that
> can deliver 25A continuously without requiring a cooling fan of any kind.
> All it's running is the K3s/P3 and a couple of boxes with less than 1A draw
> each. The front panel meter on the Samlex is showing a tad over 20A when
> transmitting 100W in FT8/RTTY. Any suggestions? Within reason, cost isn't a
> major issue.
> 
> 
> ---------------------------------------------
> 73 and Good DX
> Peter, W2IRT
> 
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