[time-nuts] Racal-Dana 1991 w. Option 4C - what is that ?

[Jean-Louis Oneto]

I checked the documentations I have, the option 4C isn't mentionned, but 
all the (Internal Reference) options 04x (04A=OCXO, 04B=High Stability 
OCXO, 04T=TCXO, 04E=High Stability OCXO (?)) are 10 MHz. There is a 
Reference Frequency Multiplier (Option 10) which allows to use 1, 2, 5 
or 10 MHz as an external reference.
The parts numbers are:
option 04A: 11-1710 (oscillator), assy=9444
option 04B: 11-1711 (oscillator), assy=9423
option 04E: 404386
option 04T: 11-1610 (plate assy) + 19-1208 (oscillator PCB)
option 10: 19-1164
Hope that helps,
Regards,
Jean-Louis

Le 30/01/2012 17:24, cfo a écrit :
> On Fri, 20 Jan 2012 09:18:32 -0800, Larry McDavid wrote:
>
>
>> One does occasionally find Racal 9462 ocxo offered on eBay. Also, one
>> sometimes finds non-operational Racal instruments offered at low price
>> but which to have Option 04E installed. I convinced one seller to remove
>> the Option 04E module (the Racal 9462) and sell just that with much
>> lower shipping cost.
>>
>> There is also what is evidently an older Racal frequency standard module
>> similar in appearance to the 9462 but which has screws attaching the end
>> plate rather than the soldered-can 9462; one of those is seen from time
>> to time on eBay from the UK but I have avoided that.
>>
> I have been looking for a Racal 9462 ocxo , for my Racal-Dana 1991
> counter. I will prob. use my Tbolt anyway , and save the money.
>
> But i'm confused ... Is it a 5 Mhz or a 10 Mhz unit.
>
> I have found pictures of one claiming it's 5Mhz
> http://www.jbtech.de/parts/racal_dana/9462.html
>
> But i have also received a picture from jaap , with a racal 9492 , where
> it clearly says its a 10Mhz unit.
>
> Can anyone clarify ?
>
> I think there was an "option" that enabled the use of "other ocxo values"
> is that why a 5Mhz can be used , in some 1991's ?
>
> If i ever decide to get a OCXO , i would like to get the "right one".
>
> Regards
> CFO
>
>
>
>
>
>
>
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-- 
Jean-Louis Oneto
OCA GeoAzur - Avenue Nicolas Copernic - 06130 Grasse - France
email: Jean-Louis.Oneto at obs-azur.fr
phone: (+33)[0]4.93.40.53.80