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Details about  0.5mhz to 20 MHz Programable Rubidium Frequency standard/oscillator

10mhz 11.2896mhz 5mhz 16.9344mhz .include PC software.

0.5mhz to 20 MHz Programable Rubidium Frequency standard/oscillator
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Item Information

Item condition:
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US $120.00
Approximately C $146.04(including shipping)
US $15.00 (approx. C $18.25) Economy Int'l Shipping | See details
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China, China
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Last updated on  May 11, 2014 00:42:27 EDT  View all revisions

Item specifics

Used: An item that has been used previously. The item may have some signs of cosmetic wear, but is fully ... Read moreabout the condition

Note: if you set to 10mhz,and also wish to mod 1pps out.ask me after you paid.(need to take off the case,and wire one cable out)

It need some DIY(wired the rs232 port to PC),if you can NOT do that ,
from 4th/4/2014 .can mod 1pps version not available.

you can also mod 0.5-20mhz .


                                                                                                                shipping time 20-30 days

Frequency Electronics FE-5680A Rubidium Oscillator Std

Here is a Rubidium Oscillator Frequency Standard from FEI, model number FE-5680A. This oscillator is a pull from a system that is no longer in use. These units provide a 1 Pulse-per-Second output.

The FE-5680A features:
  • Extremely low silhouette: less than 1.0 inch
  • Stability over temperature: 5x10(-11)
  • Fast Warm-up: <5 min.
  • Stability: To 5x10(-12)/ sqrt(t) to 2x10(-10)/year
1.You should Open its case .
2.Connect the RS232 to its motherboard (where also have a TX RX connetor )
3.Open the Hyper Terminal in your windows system.
4.Power on it.
5.Then follow my manual,And calculate two Mathematics.
6.Type the number on your keyboard. and press the Enter on your keyboard.
7.The signal what you need will come from the pin6.(From 1hz to 20mhz freq,this depend on what you type on the keyboard or what you want .)
8.if you want the freq  been locked.when you power on next time,also no need to do again aboved,just one command type on your keyboard will been enough.

You are bidding on one used in excellent condition FE-5680A Rubidium Frequency Standard made by Frequency Electronics. I have the instructions on how to modify this item to a 10 MHZ output (0.5mhz-20mhz)..


I also have a set of instructions to reprogram these.

we are suppefast shipping 。。。。please view my feedback

Function Description   Technical Characteristics

The Fe-5680A Rb frequency standard is 3.5x5.1 inches, a design suited to PC board slot mounted applications. A simplified functional block diagram is shown in Figure 3 


Many commercial applications for precision frequency standards demand performance over an expended temperature range. Often frequency variation with temperature is the performance range. Often frequency variation with temperature is the performance-limiting feature of these devices for CDMA holdover applications. The two products described in this paper have both been designed to operate over extended temperature ranges while guaranteeing a frequency variation of less than 1E-10. The FE-5680A operates at any temperature between -10 and +60 deg. C, a temperature range required for indoor rack-mounted telecommunication hardware with limited air flow. The FE-5652A operates at any temperature between -40 and +85 deg. C, a temperature range required for outdoor, limited access, low maintenance telecommunication hardware.

Frequency variations due to ambient temperature variations can easily swamp other sources of instability for a Rb frequency standard operating in a real life environment. Therefore, special attention was given to frequency stability vs. temperature in these designs. Figure 5 and 5 show typical performance data for FE-5680A and FE-5652A. Rb standards over the ambient temperature range. In addition to the information provided by these plots, it is useful to understand the distribution of performance associated with a production lot of these devices. Table 2 provides this information.

The information in this table shows that the mean total frequency deviation over temperature is very small. What this really means is that the frequency deviation is equally likely to be positive or negative. The standard deviation values give an indication of the range of deviations to be expected amongst production devices.

Allan deviation stability data for the FE 5680A Rb standards are shown in Figure 7. The measurements used to derive the Allan deviation were all made at 25 deg. C. It is of interest to note that the result for SN 4005 is significantly improved by comparing it to another Rb standard (SN 5359) rather than a Cs reference. This indicates that the result is limited by the stability of the Cs reference.


Performance results for two new Rubidium frequency standard products have been reported. These products continue the trend toward small, robust, high-performance atomic frequency standards capable of operating in harsh non-laboratory environments, yet providing stabilities approaching those measured under controlled laboratory conditions. These devices are well suited to the demands of the telecommunications industry for the performance-limiting feature of these devices for CDMA increasingly precise time and frequency references capable of operating unattended in harsh environments.

Frequency 10 MHz (factory settable 1 Hz to 20 MHz)
Settability (frequency) ±1 x 10-11
Adjustmant Range 2 x 10-9
Long Term Stability 2 x 10-9/year
2 x 10-11/day
Short Term Stability Averaging Time (SEC) 1.4 x 10-11
Warm-up Time <5 min. to lock
Retrace 5 x 10-11
Output Voltage 0.5 V RMS into 50 ohm sinewave
Harmonic Distortion 30dB
Spurs 60dB

Phase Noise
@ 10MHz

Hz dBc
10 100
100 125
1000 145
Frequency vs Temp 3 x 10-10 (-5°C to +50°C)
Power Consumption (25¡C) 11 W (steady state)
32 W (peak)ÊÊ
Voltage Required 15 to 18 V @700mA
Size 0.98" x 3.4" x 4.92"
Weight 15.3 oz.
-5¡C to +50¡C

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Item location: China, China
Shipping to: Worldwide
Domestic handling time
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