[amsat-bb] Re: Question about vacuum and power module for linear transponder
G0MRF at aol.com
Sat Dec 19 12:01:37 PST 2009
In a message dated 19/12/2009 15:36:41 GMT Standard Time, pe1rah at yahoo.com
I also would like to know if anyone has experience in SSB mode with the
new power modules types from Mitsubishi. Like the RA60H1317M, which can give
60W power on 2m with only 50mW input power.
I am looking for some PA behind my LE005-R2 transponder design, to get a
small sized high-power linear transponder. The transponder gives 200mW PEP,
so the 50mW is no problem at all.I just wonder how linear these Mitsubishi
modules are, when using in linear mode.
The RA60H1317M is hopelessly inefficient for use in space. It has
reliability issues linked with the junction wires where they bond onto the
A better solution would be to build a class AB linear from 2 suitable FETs.
An even better solution but one requiring a lot of development would be to
separate the modulation into phase and amplitude and then modulate the gate
with phase and drain with amplitude. Efficiency >80%
Besides....where is your 60W going? Venus? Huge power....
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