RUBIDIUM ATOMIC FREQUENCY STANDARD FE-5680A SERIES

As far as holding their adjustments under similar conditions, they seem to be comparable. As a 10 MHz reference for microwave transverters, I’ve found the “barefoot” FEA to be unsuitable for microwave transverters due to low-level audio-frequency phase modulation on the output. To use the FEA with a microwave transverter it is necessary to “clean up” its output by locking another crystal oscillator to it as described below. I ordered three from Supplier 1 and one from Supplier 2. Also, the largest source of frequency drift is likely to be temperature, so for the best performance the temperature can be stabilized with a thermostatically-controlled fan directed at the unit’s heasink. What this means is that the field you enter will always be zero and one must decipher the HEX values displayed and convert them to decimal to determine what the current offset is.

Once this value is found, one may write the value “permanently” into the unit and it is recommended that his number be written in indelible ink on the unit itself for future reference. The short-term drift of the receiver a 5ppm specification FT is apparent even after shutting doors to minimise drafts. Amazon Inspire Digital Educational Resources. Performance very first impressions: The one that runs the cell heater is about a volt lower and the one that runs the analog circuits is set to 8. A change in temperature of this crystal seemed to cause a repeatable phase shift and it is likely that the power applied to the heater attached to the crystal itself changes slightly as the input voltage changes.

In any case I have no need for a 1pps output – I use a GPS module to get a 1pps signal which also has the advantage of being in-phase with real time seconds. A simplified functional block diagram is shown in Figure 3.

C, a temperature range required for outdoor, limited frequehcy, low maintenance telecommunication hardware. What is the typical drift with temperature tempco? Please make sure that you are posting in the form of a question.

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This should be easy to verify. You may find these two papers helpful: The DDS frequencies are alternated at Beale’s modification shown here: This is a 1mHz error at kHz and about uHz at kHz!!! Also, the largest source of frequency drift is likely to be temperature, so for the best performance the temperature can be stabilized with a thermostatically-controlled fan directed at the unit’s heasink.

The short-term drift of the receiver a 5ppm specification FT is apparent even after shutting doors to minimise drafts.

Model FEA Rubidium Atomic Frequency Standards from Frequency Electronics, Inc.

As a 10 MHz reference for microwave transverters, I’ve found the “barefoot” FEA to be unsuitable for microwave transverters due to low-level audio-frequency phase modulation on the output. Standaed Inspire Digital Educational Resources. See also this post from Elio Corbolante. The information in this table shows that the mean total frequency deviation over temperature is very small.

After eight weeks of monitoring to 1 E, I still see no aging.

This involved unscrewing the small board near the RS connector three screws – watch out for the little washers underneath to gain access to the back of the RS connector.

I have not seen that issue on LPRO’s. What typically happens is that electronics synthesizes an RF microwave signal and continuously sweeps across a narrow range of frequencies; the element Rb or Cs or H will respond more or less depending on how correct the probe frequency is. Rb frequency references are used wherever a stable frequency, time or time interval is needed.

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That’s fine as I have a need for a fixed 10MHz source plus the fact that this was by far the cheapest of the three units.

You can still see all customer reviews for the product.

Features Extremely low silhouette: Introduction I am a bit of a frequency accuracy nut, probably due to my pre-occupation with narrowband modes where knowing where you are in terms of frequency is often the critical factor for success. You should read this document to find details not contained here.

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Using the program, I did a “binary search” by first selecting rather large offset values to determine which polarity of offset positive or negative reversed the direction of the offset and then started cutting those values in half, always staying on the side of reduce rate-of-change of the phase change.

Summary Here are the characteristics of each unit. Firing up the program, I read the offset that had been programmed into the FEA from either the factory or the previous owner and found it to be set to zero.

Entries in red may or may not be applicable to this unit and need to be verified.

I had to open the case to add the connections required myself. A few weeks ago I performed a thermal test while noting weries power use of the FEA.

Can I get a square wave 10 MHz output instead of a sine wave?

: Customer reviews: OEM FEA 10MHz Out Rubidium Atomic Frequency Standard

Is a Rb standard affected by magnetic fields? After the equilibrium is reached, I would again drop the voltage. I was able to get the total power consumption of the frequency standard below 6 watts and maintain lock.

As far as holding their adjustments under similar conditions, they seem to be comparable. Most rubidium frequency standards and cesium for that matter do not actually output that frequency. According to those sources the ‘1pps’ will stanndard a period of 0.

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