FEI Frequency Standards

Background

FE-5650A Rubidium Oscillator

"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."

Fig 1	Fig 2 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 3
Fig 4	Fig 5	Fig 6 FE5650A option COPM
Lucent OMR PCB Interface	2-way RF power Divider & +5V Supply for FE-5650A
Made 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
Note The power supply needs to have at least 1.5 Amp capacity at 15.0 Volts in order to get the oven warming, and this will drop down to less than 600 ma in a few minutes. A power supply that's limited to 1.0 Amps output like the E3617A or E3631A will never get the heater warm enough to allow the current to decrease.	Note The OMR can NOT be powered using a 1 amp capacity power sypply for the 15 Volt input.  It needs slightly more than 2 amps to get started and after a couple of minutes drops back to about 1.5 Amps.

FE-5680A

As Received

PICOSYNC p/n 28031-40068

DC Input

Blue: +27 VDC
Black: return
Cold start: 389 ma dropping to 200 ma in a minute or so, 170 ma when warmed up.

LED: Alternate Red/Green when no antenna connected.
        One second off & one second green during normal operation.
        If antenna disconnected after normal operation: one second red & one second green.
        Loss of satellites: solid red
        After about 15 minutes of good reception the LED is on steady green.
PP2S BNC jack: one pulse every 2 seconds +3.3V/-0.06V

Note the RS-232 connector is a DB-9m.  This is very different from the DB-9f on the Thunderbolt and will require a cable that has male on one end (common) and female on the other end (not so common).  Maybe a null modem cable?

http://support.fei-zyfer.com/95_download.aspx
Is a file with no extension.  If the name is changed to end .exe and the file is run.  The resulting program looks like:
Note: Pico Sync not connected because of lack of proper cable.

5680B

p/n: 2616000-51604

Pin Function
1  >= +15V power in (likely the same spec as 5680A)
2  ground
3   +5 power in (for some, but not this one)
4  ground
5  RF out (for some, but not this one)
6  spare
7  ground
8  0 to 5V(?) analog tune in (for some but not all, I’d *guess* not for this one)
9  factory use only
10  ground
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)

Patents

FEI

4701661 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

5160901 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

6577201 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

7106143 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 -

Patent Citations

Cited Patent	Filing date	Publication date	Applicant	Title
US4453141	Jan 28, 1982	Jun 5, 1984	The United States Of America As Represented By The Secretary Of The Army	Suppression of vibration effects on piezoelectric crystal resonators
US4949055 *	Aug 28, 1987	Aug 14, 1990	Franz Leitl	Crystal oscillator compensation circuit
US5323083	Dec 21, 1992	Jun 21, 1994	Piezo Technology, Inc.	Crystal resonator having reduced acceleration sensitivity
US6707346 *	Dec 19, 2001	Mar 16, 2004	The Boeing Company	Apparatus and method for improved crystal time reference
JPS60207237A				Title not available
JPS63119199A				Title not available

* Cited by examiner

Non-Patent Citations

Reference
1		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

* Cited by examiner

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