Gary,
See below;
*********** REPLY SEPARATOR ***********
On 3/31/06 at 2:13 PM Gary Schafer wrote:
>Hi Will,
>
>There are many HP oscillators that are just marginal. I have an HP 5316
>counter with a tcxo in it that drifts all over the place. It works within
>their spec but it is not very high stability.
>
>I also have an HP 5334B counter with the good oven high stability
>oscillator
>in it. It is one of the best oscillators they made. Very stable.
>
>Do a search on the internet for the 5334 counter. I ran across the engineer
>that designed the 5334B a year or so ago. He gave some good info on it. He
>said that the 5334A's time base was terrible compared to the one in the
>5334B.
>I can't remember where it was, maybe in sci.electronics.equipment?
>
>The point is that you should look for that good time base in what you are
>buying if you want a good frequency reference.
The 5328 I have, I lucked into on ebay as it's kind of rare. It has the oven
oscilator option, the 1.2 GHz option C, and The voltmeter option. No HPIB
option though, and why I couldn't figure with everything else it had? I would
have to see what the part number is for the oven oscillator in it though. I do
know its aging accuracy is about what you mentioned. It has an output jack for
the oven oscillator on the back which I could pipe into the generator. The
manual on the generator says it can use either 10 MHz, 5 MHz, or 2.5 MHz.
>
>I think the model number on the time base is HP 10811. Sometimes you see
>them as HP 10811-60111. I think the last numbers include the card that it
>mounts on. Often they can be put into your existing counter / equipment or
>you could pipe it in through the external reference jack.
I looked into this and that is all HP did. They had a BNC jumper made up, but
it was made from hard plastic with the two BNC connectors on it. A man could
make one of these with a short piece of coax. It was made to connect the Ref
Freq input to the oven oscillator output where both jacks are side by side. All
a person needs to do is mount the oscillator inside where it goes, connect the
power, and bring the RF out the back with a BNC bulkhead connector. I would say
there's a power connector hanging loose inside for it. They done it this way,
according to the manual, so you could use it without the oven oscillator, or
connect a rubidium or cesium freq standard to it.
>You may be able to put into your counter and you would be all set.
>
>This one has 2 x 10 -8 per year!
>
>Here is one on ebay.
>http://cgi.ebay.com/HP-10811-60111-with-board-OSCILLATOR-NICE_W0QQitemZ75808
>33445QQcategoryZ25399QQrdZ1QQcmdZViewItem
>
>73
>Gary K4FMX
>> >
>> >
>> >73
>> >Gary K4FMX
>>
Thanks,
Will
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