Harry,
have a look at the following page:
http://www.xs4all.nl/~barendh/Indexeng.htm
He seem to stock several old Plessey prescalers, and it should keep
you going for a while.

I guess eventually these chips WILL be nowhere to be found within a
few years time but that is evolution....

One non-obsolete chip-source would be Peregrine,
http://www.peregrine-semi.com/prd_pll.html
they have some neat parallell programmed IC's that runs to over 3 GHz.
They are an improved Qualcomm Q3036 which can be found as surplus
And there is several more interesting IC, not only PLL and prescalers
but complete PLL with internal EPROM which keeps the serial programmed
data even if one shut off the power. Great for that miniaturized
project!!

GL
-Lasse SM5GLC
On Fri, 15 Aug 2003 08:26:47 +0200, "Harry \(SM0VPO\)"
wrote: