[time-nuts] Thunderbolt MV-89a OCXO Transplant?

Bob Camp lists at rtty.us
Tue May 28 18:48:10 EDT 2013


I wonder what the spec on the CMAC OCXO's really is? 

The data sheet on the auction site looks like it is a straight copy of the Morion data sheet on the MV89…


On May 28, 2013, at 5:49 PM, John Miles <john at miles.io> wrote:

> Could also be worth considering the C-MAC STP 2055B DOCXOs being sold out of
> China at the moment ( http://www.ebay.com/itm/170471367031 ).  Out of 14
> units that I bought, three were excessively noisy and/or jumpy, eight were
> good for <= 2E-12 at t=1s, and three were exceptional performers <= 3E-13 at
> t=1s.  As with the Morion DOCXOs, their retrace, environmental sensitivity,
> and long-term stability characteristics are outstanding.
> Their broadband floor is around -155, a bit quieter than the MV89As.
> Otherwise they're pretty similar, and he seems to have a large quantity of
> them.  Unfortunately they won't plug directly into the Trimble PCB, as they
> have some threaded mounting studs and an extra pin for a CMOS-level warmup
> signal.  They could be modified or adapted without much trouble. 
> -- john, KE5FX
> Miles Design LLC
>> -----Original Message-----
>> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
>> Behalf Of Bob Camp
>> Sent: Tuesday, May 28, 2013 9:52 AM
>> To: 'Discussion of precise time and frequency measurement'
>> Subject: Re: [time-nuts] Thunderbolt MV-89a OCXO Transplant?
>> Hi
>> The MV89A is a 5 MHz resonator doubled to 10 MHz, it will have sub
> harmonics
>> that the original OCXO (using a 10 MHz resonator) does not have...
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