"OM redundancy The Oscillator Module provides a highly stable timing reference capable of being disciplined from an external source, such as the GPS receiver or network clock. Two versions are available: Rubidium based (OMR), which is capable of running for 24 hrs without an external reference (flywheeling), and Quartz Crystal based (OMQ), which can flywheel for eight hours. The OMR serves as a primary timing reference where high long term accuracy is required. The OMQ can be used as a primary source, where long term drift accuracies are more relaxed or as a secondary (back-up), to be used upon the primary’s failure. The OMR may also be used as secondary if desired, in applications where low cost is not a requirement."
||Lock Ind. (BITE) - low when locked|
(or perhaps EFC control ?) -
definitely analog and swings 0-15V
||Serial In (TTL)|
||Serial Out (TTL)|
The part marked Q2 (IRL540N) that has black heat shrink tubing gets
extreamly hot when the OMR is powered from 15 VDC.
It's a pass regulator dropping 15 V to 5V.
Power = 10 V * 0.6 A = 6 Watts.
||Fig 6 FE5650A option COPM
|Lucent OMR PCB Interface
||2-way RF power Divider &
+5V Supply for FE-5650A
up a DB-9f to wire cable for the FE-5650 (alow will work for
the 5680) with +5, +15 and lock indicator.
Powered with the HP 6038A power supply for the +15V and the HP E3631A for the +5 (tried using it for both +15 and +5 but the +15 was not strong enough to get started).
Looked at the RF oputput using the Rigol DS1052E, see below.
|15 MHz Output of FE5650A
The frequency is shown as 15.06 MHz which is
measuring how poor the scope is, not the FE5650A.
|FE-5650A & Lucent OMR
Working Test Setup
1 >= +15V power in (likely the same spec as 5680A)
3 +5 power in (for some, but not this one)
5 RF out (for some, but not this one)
8 0 to 5V(?) analog tune in (for some but not all, I’d *guess* not for this one)
9 factory use only
11 1 pps out (for this one, but not all) lvttl
12 lock indicator (open collector)
13 reset (lvttl input, active high)
14 serial in (lvttl)
15 serial out (lvttl)
FEI4701661 Piezoelectric resonators having a lateral field excited SC cut quartz crystal element
4748367 Contact heater for piezoelectric effect resonator crystal, Martin B. Bloch, Bruce Goldfrank, (Frequency Electronics, Inc.), May 31, 1988
310/343, 310/369, 310/346, 310/365, 310/353 - provision for tuning and heater
5107226 Atomic frequency standard using optical pumping for state preparation and magnetic state selection of atoms, Iancu Pascaru, (Frequency Electronics, Inc.), Apr 21, 1992
331/3, 331/94.1 - Cs standard described in 41st Ann. SFC 59 and 39th Ann. SFC 18
Multimode crystal oscillator,Charles S. Stone (Frequency Electronics, Inc.), Nov 3, 1992, 331/37, 331/60, 331/41, 331/43, 331/116.00R, 331/176, 331/158
Used to detect the effect of temperature on the oscillation frequency, not as a desired output.
5309116 Multimode crystal oscillator,Charles S. Stone (Frequency Electronics, Inc.), May 3, 1994,
331/37, 331/158, 331/60, 331/116.00R, 331/43, 331/176, 331/41
Precision oven-controlled crystal oscillator,John C. Ho, Charles Stone, Thomas McClelland, (Frequency Electronics, Inc.), Jun 10, 2003,
331/16, 327/156, 331/25, 331/66, 375/376 - uses a slightly off frequency crystal then a DDS changes that to the desired output frequency
6753737 Precision oven-controlled crystal oscillator, John C. Ho, Charles Stone, Thomas McClelland, (Frequency Electronics, Inc.), Jun 22, 2004,
331/16, 331/25, 375/376, 327/156, 331/66 - uses a slightly off frequency crystal then a DDS changes that to the desired output frequency
Method for achieving highly reproducible acceleration insensitive quartz crystal oscillators,Martin Bloch, Oleandro Mancini, Charles Stone,
(Frequency Electronics, Inc.), Sep 12, 2006, 331/65, 331/158, 331/68 -
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Title not available JPS63119199A
Title not availableNon-Patent Citations
Hideo Kawahara, Japanese Office Action Mailing Date Aug. 31, 2004, and English translation. 2
Rosati, Vincent J., Suppression of Vibration-Induced Phase Noise In Crystal Oscillators: An Update, 41<SUP>st </SUP>Annual Frequency Control Symposium-1987.Referenced by
Citing Patent Filing date Publication date Applicant Title US7369003 * May 22, 2006 May 6, 2008 Nvidia Corporation Oscillator system having a plurality of microelectromechanical resonators and method of designing, controlling or operating the same US7398163 * Aug 11, 2005 Jul 8, 2008 Nihon Dempa Kogyo Co., Ltd. Sensing apparatus US7443258 * Apr 6, 2006 Oct 28, 2008 Sitime Corporation Oscillator system having a plurality of microelectromechanical resonators and method of designing, controlling or operating same US7876167 Feb 8, 2008 Jan 25, 2011 Silicon Laboratories Inc. Hybrid system having a non-MEMS device and a MEMS device US7899633 * May 28, 2008 Mar 1, 2011 Nihon Dempa Kogyo Co., Ltd. Sensing apparatus US8188800 Nov 5, 2009 May 29, 2012 Greenray Industries, Inc. Crystal oscillator with reduced acceleration sensitivity US8436690 Nov 30, 2010 May 7, 2013 Silicon Laboratories Inc. Hybrid system having a non-MEMS device and a MEMS device US8461935 Nov 30, 2010 Jun 11, 2013 Silicon Laboratories Inc. Hybrid system having a non-MEMS device and a MEMS device US8525607 May 17, 2012 Sep 3, 2013 Greenray Industries, Inc. Crystal oscillator with reduced acceleration sensitivity US20120043999 * Oct 31, 2011 Feb 23, 2012 Quevy Emmanuel P Mems stabilized oscillator
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