[time-nuts] Re: Phase noise of HP8663A 640 MHz reference?

[Richard (Rick) Karlquist]

The 8663 has a 10811 driving an X8 driving an 80 MHz
xtal filter.  The cleaned up 80 MHz drives another
X8 to make 640 MHz, which is further cleaned up with
a 640 MHz SAW filter.

At least with the 8662, you have to purchase an option
to even have a 640 MHz output at all.

The SAW filter was made at HP in Santa Rosa originally,
but then they closed the fab for it.  I designed the
SAW filter into the 5071A in the form of a phase locked
oscillator.  A few 100 instruments were made, but then
I had to design it out.

Rick N6RK

On 8/12/2022 11:30 AM, Alex Pummer via time-nuts wrote:
> if it is not to urgent I could measure it for you, I have the HP8663A 
> and one 8562E with the "special function" box
> 
> On 8/12/2022 10:37 AM, ed breya via time-nuts wrote:
>> Just wondering if anyone happens to know typical or an actual measured 
>> phase noise instance of the 640 MHz reference in the HP8663A. It does 
>> not seem to be specified (unless I missed it somehow), but there's an 
>> "option 03" that specifies it. I don't think the option provides any 
>> improvement, just results of an actual measurement on the particular 
>> unit.
>>
>> Ed
>>
>>
>>
>> _______________________________________________
>> time-nuts mailing list -- time-nuts at lists.febo.com
>> To unsubscribe send an email to time-nuts-leave at lists.febo.com
>>
> _______________________________________________
> time-nuts mailing list -- time-nuts at lists.febo.com
> To unsubscribe send an email to time-nuts-leave at lists.febo.com
>