[Amps] High Voltage RF Transistors and Power Supply's

[R.Measures]

On Jan 5, 2005, at 1:03 PM, Dan Levin wrote:

> As I mentioned in an earlier posting, I've been thinking
> about a 1500 watt HF solid state linear.  It turns out
> that I am not alone - several fellow travellers are
> further down the road than I.
>
> While most folks seem to be using 50 volt MRF-150 type
> parts, I've run into two companies that are building
> higher voltage, plastic packaged, RF amps.  IxysRF
> makes 150 volt parts, and Advanced Power Technology
> makes 125 volt parts.

In order to operate from a 50v PS in p-p RF-amp service, a transistor 
needs to have a C-E or S-D breakdown potential of at least 120v.

>  They are interesting for a
> variety of reasons, but one is that they are much
> cheaper than MRF-150 type parts :-)
>
> Two questions:
>
> 1) Does anyone have experience or opinions about these higher
> voltage parts, e.g. the APT ARF463A/B?
>
> 2) Can anyone point me to info on building a 125 volt or
> 150 volt DC high current power supply?  It seems in theory
> that it should be possible to build such a beast without
> a transformer, which might be a major savings in size,
> weight and money.
>
> Thanks!
>
>                     ***dan, K6IF
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>

Richard L. Measures, AG6K, 805.386.3734.  www.somis.org