? Cashier's cheques can be forged.
>Cashier's check only.....
>
>Sincerely,
>
>Dr. William J. Schmidt, II K9HZ
>
>"Collector of Edison Wind-up Phonographs... Do you have one for me?"
>Email: bill@wjschmidt.com
>Alternate Email: wmschmidt@charter.net
>WebPage: www.wjschmidt.com
>
>
>
>----- Original Message -----
>From: "rlm" <r@somis.org>
>To: "Mike, K8LH" <k8lh@kramerairtool.com>; "AMPS" <Amps@contesting.com>
>Sent: Wednesday, August 27, 2003 11:01 AM
>Subject: Re: [Amps] PS Theory ?
>
>
>>
>>
>> >
>> >Please excuse the dumb question... I'm trying to figure out how to
>> >determine the power handling capability of transformers (I did take a
>> >quick look through the ARRL Handbook last night)...
>> >
>> >Questions:
>> >
>> >How can you determine the power handling capability of a transformer???
>> >
>> ? primarily by measuring the resistance of the secondary winding.
>> Look in "Amplifiers" on my Web site for some rule of thumb formulas.
>>
>> >For example, the secondary on the transformer in my Heath SB-201 is
>> >rated at 800 VAC at 0.5 amps... I would think this transformer would
>> >only be good for about 400 watts of power (800 x 0.5) but it seems that
>> >if you feed this secondary into a full-wave bridge rectifier and
>> >capacitors you would get about 1,000 volts and 0.5 amps under load (500
>> >watts), or feed it into a voltage doubler circuit, like that in the
>> >SB-201, and you get about 2,000 vdc at 0.5 amps under load (1,000
>> >watts)...
>> >
>> >I'm confused... What am I missing???
>>
>> ? Duty-cycle considerations. For SSB, a 600W-CCS rated transformer will
>> make c. 1500w pep RF-output.
>>
>> _______________________________________________
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>
>
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