Saturday, Pineapple Technology near our Radio Club's coffee shop had a big
house cleaning. They are a big commercial Solid StateTV transmitter
Manufacturer. So I went over to see what was being hauled out the
door....Turns out Lots of goodies. but I am over my head here, but have an
interest in EME QRO components, and a build for TX EME on 432 and 1296. Among
the 100 lbs or so of aluminum heat sinked boards are a number fully populated,
that use pairs of Motorola BLF 872s, LDMOS devices for which the data Sheets
show 300W capability/device between 470 and 800 mHz. The engineer there said
these were tuned to 470mHz. and run on 28-32 VDC.
There were several heat sinked board arrays with a square duct layout with huge
heat sinked fins inside the duct, with huge fans to pump air.
The many boards had active devices of: BLF 861A, BLF 872, MRF377, Polyfet LQ
801 BTW they still have a 50 KW fan cooled roll around Bird Dummy Load for
sale at $500.
Also tossed and picked up, were numerous 32V 75 amp power supplies some
working, some dead on arrival, according Pineapple Q/A. I am interested in
learning how to take these boards to 432 for High Power EME Transmitters. Are
there any good tutorials on tweaking these high power RF amps? The board
layouts seem to closely match the Motorola/Freescale Semi Dwgs, and
applications notes. Any ham SSPA experts near Sacramento California that can
tame these beasts?
Best Regards,
Pat AA6EG
apolloeme@gmail.com, apolloeme@live.com
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