George,
According to http://www.rfparts.com/mrf175gv-ma.html those
devices are good to 200w each at 225MHz = 800w.
They look real accessible to modification for HF given the
air wound coils ... perhaps using transformers and splitter-combiners
from communication-concepts.com ?
Of course you'd still need a switched multiband output filter
plus SWR protection and cooling.
Sadly, such a project is above my pay grade, but I'm curious
if it would be practical.
WDYT?
David
> Folks, I have three high power VHF amplifiers for sale. Each uses four
> MRF-175GV, I have tested them to 500 watts output with on 22 watts input.
> These are designed to operate class AB and C from 140 to 150MHz
> commercial use, each is mounted on a 3/8 inch aluminum plate, so
> mounting this to a heatsink is easy.
> Originally they were made for key-down 24/7 operation combining outputs
> for high power commercial communications applications, however not ISM
> since the are AB.
> They were designed for 28v operation, but work very well at 24-25 VDC.
> I powered them using two EVGA 80plus gold computer power supplies with
> the 12VDC outputs
> in series achieving about 25VDC . The T/R switching will need to be
> added and of course adequate cooling.
> Please check the link provided, if there is no interest in about a week,
> I plan to put them on Ebay. Asking $350 each.
>
> http://www.k4gvt.com/ebay/VHFamp//VHFamps.htm
>
> 73,
> George, K4GVT
>
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>
--
*David* KD4E
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