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| Category:
Consumer Electronics
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Radios: CB, Ham & Shortwave
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| Start Price: |
USD 199.99 |
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USD 199.99 |
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| Start Time: |
10/24/2008 |
| End Time: |
11/23/2008 |
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China |
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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 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 (1hz-20mhz).if you won... i will send the manual and software....... I also have a set of instructions to reprogram these.i have more these oscillatorwe are suppefast shipping 。。。。please view my feedbackFunction 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 vs. TEMPERATURE 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. FREQUENCY STABILITY 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. SUMMARY 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 Environmental Size 0.98" x 3.4" x 4.92" Weight 15.3 oz. Operating Temperature -5¡C to +50¡C email mokia1985@gmail.com。QTY more just ask for me。i have more Ship by TNT worldwide S&H fee total $35 USD 4 business days worldwide by EMS worldwide S&H fee total $20 USD 10 business days to japan accept paypal payment for worldwide buyer any problem contact me mokia1985@gmail.com mokia1985 Store On May-08-08 at 12:42:03 PDT, seller added the following information: Pay with PayPal: Get a MyStoreRewards invitation for cash back On May-08-08 at 18:31:02 PDT, seller added the following information: Sellers: Delight buyers. Get your own map of past buyers.
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