[time-nuts] 12.8 MHz OCXO

Alan Melia alan.melia at btinternet.com
Sat Nov 24 11:28:34 EST 2012


Joe the reason why its not so uncommon may not be obvious in the US :-)) 
12.8MHz is used as a reference for commercial and amateur PLLs in Europe 
where the common channel spacing is 12.5kHz (/1024) or 6.25kHz (/2048). This 
may mean that 12.8MHz oscillators may be more easily found in Europe ?? A 
TCXO should be capable of 0.1ppm. I have seem a lot in mobile/cellular 
product from a UK firm called Golledge but I dont know what the specs were.

Alan G3NYK
----- Original Message ----- 
From: "Joseph Gray" <jgray at zianet.com>
To: "Discussion of precise time and frequency measurement" 
<time-nuts at febo.com>
Sent: Saturday, November 24, 2012 3:59 PM
Subject: Re: [time-nuts] 12.8 MHz OCXO


> David,
>
> Thanks for the links, but none of those meet my 0.25 ppm requirement.
>
> Joe Gray
> W5JG
>
> On Sat, Nov 24, 2012 at 1:55 AM, David C. Partridge
> <david.partridge at perdrix.co.uk> wrote:
>> With only 0.25ppm needed would a TCXO do?
>>
>> Howsabout this:
>>
>> <http://www.kuhne-electronic.de/en/products/special-offer/128-mhz-crystal-oscillator-tcxo.html>
>>
>> or
>>
>> <http://www1.futureelectronics.com/doc/IQD%20FREQUENCY%20PRODUCTS/E4191LF.pdf>
>>
>> or even
>>
>> <http://cgi.ebay.com/310376642284>
>>
>>
>> Dave
>> -----Original Message-----
>> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On 
>> Behalf Of Joseph Gray
>> Sent: 24 November 2012 08:26
>> To: Discussion of precise time and frequency measurement
>> Subject: [time-nuts] 12.8 MHz OCXO
>>
>> Can anyone recommend an inexpensive 12.8 MHz OCXO that outputs a sine 
>> wave? I've looked online, but the only ones I find costs hundreds of 
>> dollars. Anything 0.25 ppm or better is fine. A Vcc of 5-13.8 VDC 
>> preferred.
>>
>> Joe Gray
>> W5JG
>>
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