"owen.home" wrote in message
...
Help
I've just picked up an HF Power amplifier module, it's still bolted to
it's
heatsink and looks as though it may be from an amateur or commercial
transceiver. the output pair are in a big (0.5"pill) 211-xx package and
are
marked as ST devices with the numbers 3 100 2 2 on one line and 286M
beneath, the driver transistor is in a smaller 211 type package, has no
maker's mark but has 31-0021 with 9005 beneath. I've tried searching some
combinations but haven't come up with any likely part numbers - I'd
appreciate any help in identifying the devices before I apply power and do
some tests. The only markings on the board are "BM-1" where the B is
slightly above the M and there's a Motorola TIP31 bias regulator - I'm
guessing it's not out of a Japanese set because of the device types? The
seller didn't know anything about it's background but reckoned a friend
had
run a test and got 100W out for 250mw in and quoted it as capable of 250W.
Any help appreciated.
Thanks
John
MW1FGQ


The usage of word "pill" is a "slang" word for RF transistors (bi-polar or
MOSFET) originated in US by non-technical radio operators.

Popular MRF/SRF RF transistors
http://www.rfparts.com/mototran.html

The 211 case style was very popular for bi-polar devices
http://www.rfparts.com/trancase.html

If you are aware of the voltage required (12/13.8; 24/28 or 48/50 VDC),that
would be useful in reducing your search candidates. Specifications:
http://www.rfparts.com/transistorspecs.html

You can inquire with RF Parts if you desire a cross reference - for future
replacement.
http://www.rfparts.com/product.html

Handling RF Transistors
http://www.rfparts.com/install.html

w9gb