[AMPS] new transistors for UHF power

[Steve Thompson]

In message <v03102800b18d36c4f24c@[128.165.62.204]>, John Lyles
<jtml@lanl.gov> writes
>
>>>Westinghouse (now Northrup-Grumman) in Baltimore, MD, has made silicon
>>>carbide junction transistors that can operate around 200 deg C
>>>junction T
>>>(i think that's correct). Now that makes transistors compete with
>>>thermionics (tubes) at least with respect to outer temperature.
>>>John
>>>K5PRO
>>
>>At what frequencies John?
>
>UHF television band
>
>Harris Broadcast has a web site that shows the LDMOS and Silicon Carbide XMTRs.
>
>http://www.broadcast.harris.com/
>Then go to TV RF page, and then to the DIAMOND CD SERIES UHF SOLID STATE
>TRANSMITTER page.

I've been told that these weren't quite as successful as they appeared.
There's no doubt that SiC will make its impact in due course, but I
think it's some years away yet; there's a lot of problems making the raw
material free of crystal defects.

Steve


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