[Premium-Rx] HP 8649B?

[Henry Kolesnik]

I've been looking for decent HP 8640B and I need a little help on the options.  From what I understand, Option 2 allows the unit to go to 1024MHz.  Is this an internal feature or external?  The reason I ask is one seller told me that all units go to 1024 MHz but the counter needs the external doubler to get a correct indication.  This sounds bogus to me but since I've never seen a unit with Opt 2, I don't know.  
In some previous posts I recall someone mentioning that the 8640B has RF leaks that can be bothersome.  How hard is it to  minimize the leaks and once done the unit OK?.  Any advice appreciated.
tnx
hank wd5jfr
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