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

[John Howell]

According to the manual (publication TH62B4 issue 4.10.91) options 04T, 04A, 04B are all 10MHz. No mention of 04c. I vaguely remember hearing that Racal were so satisfied with their 5MHz standards than rather than produce a 10MHz version they simply attached a frequency doubler. I have a 9421 with doubler board attached.

John H.



On 30 Jan 2012, at 17:24, cfo wrote:

> 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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