[Elecraft] k3 switching supply

[Fred Townsend]

Marc I do RFI for a living. When I purchased my PowerWerx I made sure it was returnable if I found noise on it. I checked and found everything was well below published specifications so I retained the supply and have very successfully used it in the Sierras where there is virtually no man made noise which makes it sheer joy to operate. This unit was purchased before the model with LED displays was even available. 

Back in the days where commercial transmitters had scores of meters it was standard practice to shield those meters so RF would not leak out of the transmitter cabinet. I traced a problem in one HP unit to an unshielded LCD display. I suspect it may be the LED display itself in your PowerWerx that is causing your RFI. Personally I do not see the need of the meters when I can read the voltage on the K3 itself. After all it is the voltage at the K3 that counts. Not the voltage at the power supply.

73, Fred, AE6QL

-----Original Message-----
From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Marc Veenemanno made
Sent: Tuesday, June 16, 2015 3:26 AM
To: elecraft at mailman.qth.net
Cc: NE9U - Jasper
Subject: Re: [Elecraft] k3 switching supply

Mine is 6 months old, the version with the LED display, and the moving birdies on 80 and 75 meters are so strong and so annoying that I turn the supply off and operate from batteries if I operate for only an hour or so.  I’m sorry I bought the PowerWerx even though it is good looking and a nice size for my small operating desk.

Apparently their quality control is a variable, just like my birdies.
—
Marc  W8SDG

> On 6/16/2015 1:22 AM, NE9U - Jasper wrote:
>> I was about to order a switching supply for portable/dxpedition use and thought the one on elecraft site must be a good one, but i see it is getting poor reviews on eham.net for RFI/noise generation issues.
>> 
>> anyone have suggestions for a good quiet k3 switching supply?
>> 
>> scott  ne9u
>> 
>> 

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