[time-nuts] Help with HP 8640B generator

Rick Karlquist richard at karlquist.com
Fri Sep 5 13:54:40 EDT 2008


I'm unclear what you are trying to do.

Rick

steve heidmann wrote:
> 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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>
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