[time-nuts] 3GHZ Extender for HP 53131A and 53132A

[Bob Camp]

Hi

I suspect it starts with an input source stability analysis on the actual chip and layout used. You would need some pretty good models for the counter chip to do that. That may only be the first layer to the process...

Bob

On Nov 9, 2013, at 8:58 AM, Peter Gottlieb <nerd at verizon.net> wrote:

> Rick,
> 
> Can you point us to a method and schematic of a better way to make such a front end for a counter?
> 
> Peter
> 
> 
> On 11/9/2013 6:26 AM, GandalfG8 at aol.com wrote:
>> Hi Rick
>>  Thanks for the clarification.
>>  I'd thought at first you were suggesting these replacements were somehow at
>>  fault in comparison with the original design, which was the bit I couldn't
>>  understand since they seemed to be virtually identical, rather than
>> commenting  on the original design itself.
>>  I'd quoted the sensitivity mainly because that seemed to be just  about the
>> only thing left to measure other than to say, "I plugged it in  and it
>> worked ok":-), but undertand the limitations better now
>>  I still feel comfortable recommending these as a great value  substitute
>> for the HP original.
>>  Regards
>>  Nigel
>> GM8PZR
>>  -------------------------------------
>> Dynamic dividers oscillate when not driven.  Static dividers are  like
>> ordinary flip flops used for logic and do not oscillate when the  clock
>> signal is removed.
>> 
>> The MB510 is probably nothing great, even if  it was used by HP
>> in some counters.  I personally was to blame for  designing the MB506
>> into the 5334B counter.  I was trying to reduce  factory cost.
>> I knew perfectly well it didn't work all that well.  It  was at
>> least no worse that the divider used in the 5334A, which was
>> made  by HP in Santa Clara and cost $100.
>> The dividers that were made by HP in  Santa Rosa were much better
>> because they were static.  The 5386 used  these.  They were also
>> not cheap.
>> 
>> Rick Karlquist N6RK
>> HP 5334B  Project Manager
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