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

[Scott McGrath]

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.


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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