[Elecraft] Power Supplies for K3

[Richard Fjeld]

People have mentioned the Astron SS-30A switcher.  I have one and noticed when the fan came on, I could hear a high pitched squeal in the audio.  Also on Tx.

I read other reports of this.  Some people put ferrites on the fan wires.  If I remember correctly, I re-heated the solder joints on the fan wires.  Problem solved.  I like the supply because of it's small size and light weight.  I use it when portable.

Dick, n0ce

  ----- Original Message ----- 
  From: NZ0T 
  To: elecraft at mailman.qth.net 
  Sent: Thursday, June 13, 2013 1:59 PM
  Subject: Re: [Elecraft] Power Supplies for K3


  I currently use an Astron RS-35M in my home shack.  Yes it's big and hot but
  it works well, puts out no RF hash and is easy to repair if something goes
  wrong with it.  I also have an MFJ-4125 switcher for backup that I've had
  for years and it works great with no RF hash.  It does have a noisy fan but
  there are mods to fix that.  I almost always wear headphones so the fan has
  never bothered me.  I tried a JetStream switcher from CheapHam last year but
  it put S9+ out all over the HF bands so back it went!  I also have a Pyramid
  35 amp linear supply I use at our lake cabin but it has needed repair
  several times so I would advise staying away from that brand.

  73 Bill NZ0T



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