[time-nuts] HP 5316B External Reference

[Bob kb8tq]

Hi

The “typical” HP counter for many decades has phase locked an internal oscillator to 
the external reference. I have not seen any designs that use injection locking. Given the
somewhat crazy math associated with injection locking, this is not a big surprise.

By modern standards the 5316 is not all that fancy. It will give you 7 digits / second. The
5334 / 5335 series (from the 1970’s) will do 9 digits / second. The 53131 / 53132 series (
from the 1980’s)  is in the 10 digits / second region. The “modern” 5323x series can 
add another digit to that. 

The more modern stuff does this and that to add another digit to the numbers above.
The “value” of that added digit has been debated in several (hundred) threads …..

So: Does your GPSDO “help” a 5316? If it’s crazy far out of adjustment, then sure it does. 
Given it’s lower resolution it will not be “helped” as much as a more modern device.

Bob

> On Jul 11, 2020, at 6:51 PM, Wes <wes at triconet.org> wrote:
> 
> As I understand it this counter has an external reference input that isn't used directly as the time base but injection locks the internal time base.  Does anyone here know how well this works. Is using a GPSDO as a reference a worthwhile accuracy improvement?
> 
> Wes Stewart  N7WS
> 
> 
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