In message , Ian Molton
writes
Chris Morriss wrote:

Only a 3581A? Dear oh dear, even I have an HP35665A :-)

Either of you happen to know how to get hold of a cheap SA ?

What frequency range do you need it to cover?

I've got one of the first generation digital storage Marconi 2-part ones
that I don't use. (Covers up to 110MHz). It works, but I couldn't say
how well calibrated it is.
--
Chris Morriss