[AMPS] Transformer ++

[Alex Von Yonkers]

Hmmm....Have you ever designed such a monster before Jeff?
You realize you have to have variable Oscillator Frequency to be able to
move eventual EMI from the Rx frequency. And this under Receiver Control.
Unless you can design a real quiet (-100dBm EMI) 2-4KW switcher in the
frequency bands of interest. This is not a trivial task :)

Alex





> -----Original Message-----
> From: jeff millar [mailto:jeff@wa1hco.mv.com]
> Sent: Saturday, March 24, 2001 9:57 PM
> To: avy@qwestonline.com; amps@contesting.com
> Subject: Re: [AMPS] Transformer ++
>
>
> How about a switch mode power supply that drops 120-0-120 full wave
> rectified down to 50 volts?  This will require a switcher chip, some hefty
> FET's and a high frequency, high power choke but no transformer.
> Using the
> 240 feed as a 120 each side of center and two big diodes to
> rectifiy it will
> produce about 150V.  The switcher chip will track the 120 Hz power ripple
> fairly well, just use enough filter C to hold the voltage to about 60-70 V
> minimum.
>
> If you're interested, I can help with figuring the values and selecting
> parts.
>
> jeff, wa1hco
>
>
> ----- Original Message -----
> From: Alex Von Yonkers <avy@qwestonline.com>
> To: <amps@contesting.com>
> Sent: Saturday, March 24, 2001 5:07 PM
> Subject: RE: [AMPS] Transformer ++
>
>
> >
> >
> > Speaking of transformers. I'm building an amp based on four MRF157
> > Transistors from Motorola.
> > I need to build an Power Supply able to deliver 50A at 100A or two of
> > 50V/50A. I have called several transformer manufacturers but I almost
> > had an hearth attack when told about the prices.
> >
> > Any good idea?
> > Alex
> >
> > PS. Do you think that there could be a market for a 2KW+ solid
> state amp?
> >
> >
> > --
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> > Problems:                 owner-amps@contesting.com
> >
> >
>
>


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