[time-nuts] Help with HP 8640B generator

steve heidmann steveheidmann at yahoo.com
Fri Sep 5 16:29:01 UTC 2008


Hi Rick,
 
Is he available to help hot rod one with a SiGe oscillator transistor ?
 
                          Steve

--- On Thu, 9/4/08, Richard (Rick) Karlquist <richard at karlquist.com> wrote:

From: Richard (Rick) Karlquist <richard at karlquist.com>
Subject: Re: [time-nuts] Help with HP 8640B generator
To: "Discussion of precise time and frequency measurement" <time-nuts at febo.com>
Date: Thursday, September 4, 2008, 9:23 PM

Trivia:  The engineer who designed that chip for HP 35 years ago
has the cubicle next to me at Agilent Labs!  It was considered
very advanced at the time.

Rick Karlquist N6RK
(employed by Agilent Technologies)

Murray Greenman wrote:
> I've obtained a faulty HP 8640B signal generator, and have determined
> that the fault is in one of the dividers. (The unit has output only on
> the top two ranges). Other than that, the generator seems to be in fine
> fettle.
> 
> Since the chance of finding a replacement gold-plated HP-numbered ECL
> chip is less than improbable, I'm left with the option of trying to
find
> a replacement board from another junked generator.
> 
> So, does anyone by any chance have a spare divider board from an 8640B,
> or a suggestion of how to replace the 64-128MHz divider with something
> else?
> 
> 73,
> Murray ZL1BPU
> 
> 
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