[Elecraft] Noise with KX1 and Powerwerx PS

[Fred Townsend]

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of John Flynn
Sent: Tuesday, November 15, 2011 10:02 AM
Your sound is not normal. Can you localize the sound? Is it coming from the
fan? Is the Powerwerx set to 120 VAC?
73
Fred

To: Elecraft at mailman.qth.net
Subject: [Elecraft] Noise with KX1 and Powerwerx PS

Good Day Everyone,

After reading some of the discussions regarding power supplies, I've
recently bought a Powerwerx 30 amp switching power supply. I knew that this
was way more than I needed for present needs, but I didn't want to under-buy
and have to buy up later. Anyway, the unit supplies 4-5 watts indicated by
the ATU, and I have an SWR of 1.0 to about 1.9 using the Elecraft
rescommended antennas (This my only rig, and I use it from my desk). Here's
the problem: Independent of band or frequency selected, I get a noise that
sounds something like a small jet taking off or the whoosh that the
dishwasher makes on wash cycle--WWWUUUSSSHHHHHhhhhh.... (Well, sort of like
that.) The sound starts low and finishes high and then goes away briefly and
then recurs fairly regularly. The noise isn't there when I use battery mode.

Am I doing something wrong here, or is this the nature of this type of power
supply?

Tnx es 73

John KK4BOB

--
John Flynn
Tallahassee, Florida
USA
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