[Elecraft] LDMOS for QRO

[Ignacy]

Kevin Stover wrote
> W6PQL ....
> A pair of these devices @ 750W could do 1500W all day any mode. but then 
> the power supply becomes the limiting factor.. 50V at 70amps?

Expert 2k-fa uses a commercial 50v 60A (more peak) PS that weights perhaps 5
lb and is pretty small. Costs $500 in single quantities. Running 1.5KW in
contests, the Expert heats the room much less than TT Centurion. 

For 2m SSB the Freescale device has decent IMD at 900W (and 50% efficiency)
and indecent IMD but some 70% efficiency at 1.3 KW. With pre distortion
(which every SDR will have soon) perhaps one can get IMD of -50 db at 1.3
KW. At HF the issue is of multi band efficient matching. 

Ignacy, NO9E



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