[Boatanchors] PLATE XFMR

[howard holden]

As I recall, in earlier ARRL handbooks, there was something about core size that related to overall power handling capability. Also, you could look up other transformers and look at ratings vs weight. But I like Paul's method.

Howie WB2AWQ
  ----- Original Message ----- 
  From: Paul Kraemer<mailto:elespe at lisco.com> 
  To: Bill and Liz McHugh<mailto:magoo at isp.ca> ; boatanchors at mailman.qth.net<mailto:boatanchors at mailman.qth.net> 
  Sent: Monday, April 04, 2011 10:20 AM
  Subject: Re: [Boatanchors] PLATE XFMR


  Bill
  I don't know if I can find that watts / pound rule (I have it) but have 
  another technique which says that when the secondary voltage under load 
  drops 10 pct from no load that is the ccs current rating. Doesn't need to be 
  full voltage. I just put them on variac, raise the voltage to a safe level 
  and load it with resistor while watching the voltage. Ohms law does the 
  rest. Hasn't failed in 40 years. Determined experimentally with known 
  transformers.
  Paul K0UYA
  ----- Original Message ----- 
  From: "Bill and Liz McHugh" <magoo at isp.ca<mailto:magoo at isp.ca>>
  To: <boatanchors at mailman.qth.net<mailto:boatanchors at mailman.qth.net>>
  Sent: Monday, April 04, 2011 11:46 AM
  Subject: [Boatanchors] PLATE XFMR


  > Some time ago I recall someone providing a "rule of thumb" one might use 
  > to estimate the current capacity of a plate transformer based on weight 
  > and dimensions.
  >
  > I have a Hammond with an REL number which is not in any catalog and would 
  > like to be able to use it in a supply for an 813 rig I am building.
  >
  > Anyone have that "rule of thumb" at hand?
  >
  > Bill VE3NH
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