[time-nuts] HP 5345A

bg at lysator.liu.se bg at lysator.liu.se
Sat Dec 30 08:17:05 UTC 2006


John,

Thanks for the good news! I foresee a late evening with plenty of time
with the trimmers. Is the lock-range mentioned in the HP-manual?

Happy new year to everyone!

--

   Björn

On Sat, December 30, 2006 0:51, John Miles said:
> There is probably nothing wrong with it.  Two things to check: first, the
> lock range is super-narrow.  Make sure that the 10811s are very close to
> each other using the manual trimmer(s).  For the same reason, both OCXOs
> will need to warm up for a few minutes.
>
> Second, the 5345A needs an unusually-strong signal at the external
> reference
> jack, about +6 dBm or better if you're driving it from a 50-ohm source.
> The
> input load is actually in the 1K neighborhood, not 50 ohms.
>
> I've added a MAV-11 MMIC at the external-input jack on the A8 assembly on
> both of the 5345As I've owned.  None of my gear has had problems running
> from a CATV splitter on the Thunderbolt, except the 5345A.
>
> -- john, KE5FX
>
>> I have another problem with my 5345A. It works fine using the internal
>> oscillator, but when feeding an external oscillator (in this case an
>> 10811
>> from another counter) it refuses to do anything.
>>
>> Is this a common problem, or is there som kind of magic involved that
>> needs care in the phaselocking of the internal oscillator?
>>
>>
>
>
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