[Elecraft] Switching PS for travel with K2/100

[Don Brown]

Hi

Although I am not usually a big fan of MFJ they do have a few items that =
work very well. The switching power supplies that they sell are very =
quiet and have several features that are useful. The basic un-metered 25 =
amp is good for traveling because it only weighs about 3 lbs and is very =
small (5.5x6x2.5). It has an internal voltage adjustment. The same =
supply is also available in a metered version with a lighted volt and =
amp meter, a cigarette lighter plug and a front panel voltage adjustment =
(5.5x6x4). The part numbers are MFJ-4125 for the un-metered and =
MFJ-4225-MV for the metered. I use the metered PS on my work bench to =
test, repair and align K1's and K2's I have never noticed any noise from =
the supply. I also use the 45 amp MFJ-4245-MV as the main supply for my =
shack and it is just as quiet although a little large for traveling. I =
also have an Astron SS-25-M It is also a quiet supply but the meters are =
not lighted and the adjustment is inside it weighs 4.5 lbs and is larger =
at 7x9.5x2.75

Don Brown

KD5NDB


  ----- Original Message -----=20
  From: John Webster=20
  To: Elecraft@mailman.qth.net=20
  Sent: Wednesday, July 30, 2003 2:15 PM
  Subject: [Elecraft] Switching PS for travel with K2/100


  Hi Again Folk:

  Any recommendations or experience with switching
  PS for travel use with a K2 (with internal battery)=20
  AND with K2/100 top for use where necessary?

  I realize these are two very different current supply
  scenarios, but if I could find a light/quiet 16-20 amp=20
  switcher it might do double duty.  However, input
  on either situation would be most welcome.

  Requirements:

  1. As light and small as possible (needs to fit into
  Home Depot Aluminum case along with rig etc.)

  2. RF quiet.  Needs to work with random wire
  antennas, MP-1 or Buddipole (possibly indoors!).

  3. 120-240volt 50/60Hz universal input.

  4. Output voltage adjustable (for proper setting
  to float charge K2 internal battery), or must be
  at least 14.2 volts (?).

  Searching VE3MCF's very useful index to=20
  reflector topics yielded an initially promising
  discussion of the Phihong PSS-45W-150=20
  switcher.  However, in the end the consensus
  was that it failed on point 2 above.

  Any recommendations, warnings, tips or other
  help would be very much appreciated.

  73
  John, N6JW


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