[time-nuts] Upgrade an HP 5342A microwave frequency counter to have an oven oscillator.

Bob Camp kb8tq at n1k.org
Thu Nov 27 20:11:15 EST 2014


Hi

> On Nov 27, 2014, at 6:31 PM, Scott McGrath <scmcgrath at gmail.com> wrote:
> 
> You are correct  I was referring to the 'instrument' version of the 10811A with the edge connector.   
> 
> There are a lot of 10811A variants out there but the edge connector version was used in most HP instruments with an ovenized time base of that vintage.
> 
> It's worth buying dead option 1 instruments as they will have either a 10544 or 10811A as the time base mount point and electronic interface are standardized so upgrades are easy.

That of course *assumes* that the OCXO is still in there. Most of the time it’s still there. I’ve seen a couple of sellers who (maybe) “part out” dead gear. It may have been done upstream of them, who knows. 

Bob

> 
> 
> Content by Scott
> Typos by Siri
> 
>> On Nov 27, 2014, at 7:01 PM, Bob Camp <kb8tq at n1k.org> wrote:
>> 
>> Hi
>> 
>> In this case I suspect he’s referring to the version with the edge connector on it. That’s the one most instruments use rather than the connector only version or the “double oven” version. I believe that makes it a 10811A rather than a 10811B. 
>> 
>> There are a multitude of details here:
>> 
>> https://www.febo.com/pages/hp10811/HP10811AB-Manual.pdf
>> 
>> There are indeed other versions that came out after the manual. 
>> 
>> Bob
>> 
>>> On Nov 27, 2014, at 5:48 PM, Didier Juges <shalimr9 at gmail.com> wrote:
>>> 
>>> "Just remove the TCXO the 10811 just plugs in"
>>> 
>>> Note that there are many different versions of the 10811. I am familiar
>>> with at least two incompatible mechanical configurations: one is
>>> connectorized and the other is not.
>>> 
>>> Didier KO4BB
>>> 
>>>> On Thu, Nov 27, 2014 at 5:43 PM, Scott McGrath <scmcgrath at gmail.com> wrote:
>>>> 
>>>> Just remove the TCXO the 10811 just plugs in,  you will need to add the
>>>> heater oven indicator wiring and LED indicator which is usually over the
>>>> power switch   The power supply includes the oven supply already
>>>> 
>>>> Content by Scott
>>>> Typos by Siri
>>>> 
>>>>>> On Nov 27, 2014, at 5:38 PM, "Dr. David Kirkby (Kirkby Microwave Ltd)" <
>>>>> drkirkby at kirkbymicrowave.co.uk> wrote:
>>>>> 
>>>>> The HP 5342A has an optional oven oscillator. I just bought one of
>>>>> those counters, but mine has a TCXO and is about 50 kHz off at 10 GHz.
>>>>> I'm sure I can trim it closer than that, but if possible I'd like to
>>>>> stick an oven oscillator in it. Does anyone know what is involved? I
>>>>> have at least one 10811A oscillator here that I could stick inside,
>>>>> but does it need any more, or just the oscillator?
>>>>> 
>>>>> Someone said the oscillator should be an 10544-60011, but a 10811A is
>>>>> backwards compatible.
>>>>> 
>>>>> Dave
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