Forgot to mention , If you cannot find the EB's I can scan them out of an
old MOT data book DL110.
Carel , If this module is a ceramic substrate or even a soft substarte with
smll ceramic carriers , on a copper slab or some other sort of slab of
powdered metal - Google Motorola Engineering Bulletins EB8 and EB107. EB8
addresses MOT UHF power modules , EB107 has a lot of info on that type
mounting on heatsinks . Bottom line is make sure the surface is FLAT and
will stay so over temp and don't constrain the ends - use Belleville or some
sort of conical washers to keep pressure but don't keep it from being able
to move with thermal expansion.
(I co-wrote the EB107 and EB8 years ago !)
73 de Hank K7HP
> Anyone could point me to some resources describing the best way to mount
> powermodules for UHF use (like the Toshiba RA13H4047). ?
> Did googled around a bit (found a Motorola patent, 5546275) and studied
> datasheet, but still not satisfied how to establish both good thermal and
> (UHF!) connections (in an easy way....) when using these modules on a flat
> surfaced heathsink.
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