[time-nuts] Man with too many clocks.

Clint Jay cjaysharp at gmail.com
Sat Nov 5 10:01:53 EDT 2016


I own a 5680b and while it only outputs a PPS signal there is a very stable
30MHz signal available inside the unit IIRC.

I can dig mine out and find the signal if that's of use?

I believe they can be modded for 10MHz output on the 15p D type  but I've
just not managed to find time to get around to that yet.

On 5 Nov 2016 13:33, "EB4APL" <eb4apl at gmail.com> wrote:

I agree that FE-5680 is a whole family of products with very different
features and these can not deducted from the labels.

In my case I own a FE-5680A which outputs 1 PPS and a fixed (but slightly
tunable) 10 MHz and needs 2 power supply voltages, +5 V and + 15 V.

I am sending directly to you the information of the breakout board that I
use and it includes the pinout of this unit.  A caution here, some of the
FE-5680 variations have different pinouts.

Regards,

Ignacio EB4APL



El 05/11/2016 a las 2:01, Peter Reilley escribió:

> It is a FE-5680B.   It is my understanding that these were made in many
> variations
> of features but that what features were present or absent could not be
> known
> from the model numbers of other external identifying information. This one
> has the 1 PPS apparently.
>
> Pete.
>
>
>
> On 11/4/2016 1:07 PM, EB4APL wrote:
>
>> A bit OT, but regarding your Rb, some units needs to be powered thru 2
>> pins, one is used only for the 10 MHz output buffer, if remember it
>> correctly. Which is your model number?
>>
>> Ignacio EB4APL
>>
>>
>> El 04/11/2016 a las 16:35, Peter Reilley escribió:
>>
>>> I gave up on trying to use the GPS 1 PPS signal to calibrate the 10 MHz
>>> OCXO's that
>>> I have.   The reason that others have pointed out is that the
>>> uncorrected 1 PPS
>>> signal from the GPS is has just a little too much a jitter to use it for
>>> calibration
>>> with your eye using a scope.   If it were sawtooth corrected then it
>>> would be better
>>> but you really need a GPS disciplined oscillator.
>>>
>>> Not to be outdone, I brought out a rubidium oscillator that I had put
>>> away because
>>> it did not appear to work properly.   It only put out a 1 PPS signal and
>>> nothing else.
>>> I compared that with the GPS PPS and could get a good comparison on the
>>> scope.
>>> The rubidium drifted about 40 nS over 12 hours.   So it seemed to be
>>> good.
>>>
>>> With that I could adjust the OCXO's in my 5370's.   The spec for the HP
>>> 5370B with
>>> a HP 10811 OCXO is better than 1 X 10^-10 RMS for 1 sec average. That
>>> is, it should
>>> take more than 1,000 seconds for one 10 MHz wave to shift by 360
>>> degrees.   That
>>> is very hard to do using the screw adjustment in the OCXO. Even the
>>> slightest
>>> movement possible will cause a frequency change greater that is
>>> spec'ed.   How
>>> do cal labs do it?
>>>
>>> My HP 5370A has a 10544 OCXO which is spec'ed for short term stability of
>>> better than 1 X 10^11 for 1 second.   Even better than the 5370B! The
>>> adjustment
>>> screw is much coarser and it is not possible to get any better than a
>>> few seconds for
>>> one cycle phase shift of the 10 MHz OCXO against the standard. It seems
>>> that I can't
>>> get even close to the spec.
>>>
>>> These have been running for a few days.   It that enough?
>>>
>>> Pete.
>>>
>>
>>
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