EEVblog Electronics Community Forum » EEVblog » ... Back to affordable frequency standards, it would be really interesting to hear what those of you with a Rubidium Frequency Standard laying around think of the 'Network Frequency Transfer' project. It's advertised as a 'better than 1ppm' frequency standard by it's Danish creator, …

For decades, the vapor-cell Rubidium Atomic Frequency Standard (RAFS) has been the most extensively used form of the atomic clock globally, 1,2 with applications spanning from commercial to aerospace. 3 To a great extent, this phenomenon is attributable to the excellent performance of the rubidium atomic clock, which include a …

Re: Testing the HP 5315B with a Rubidium frequency standard. I'd like to do this as well : use the FE-5680A as a 10 MHz frequency standard. I have bought one via eBay and it works fine in the test setup. Some simple tests : My HP 33120A has to be set to 10 MHz + 81 Hz to generate the same frequency as the FE-5680A.

EFRATOM LPRO-101. 10 MHz Rubidium Frequency Standard. Output: 10,000,000.00 Hz sine wave. Tested and working perfectly. Stable and precise. The unit locks in around 3min30sec after its warm-up phase. It requires 24V and at least 1.6A of power. I would let it go for 250 EUR / 280 USD and can post it worldwide.

An, S., et al.: IEEE 2016 European Frequency and Time Forum (EFTF)-York, United Kingdom (2016.4.4–2016.4.7). 2016 European Frequency and Time Forum (EFTF)-Main features of space rubidium atomic Frequency standard for …

Re: EEVblog #456 - CSIRO Rubidium Frequency Standard. « Reply #6 on: April 19, 2013, 05:03:01 am ». According to the manual for the 53131A, you can connect your rubidium frequency standard up to the back of the frequency counter (search the PDF for the words "external timebase"), and suddenly the accuracy of your Agilent …

Re: Eevblog #235 - Rubidium Frequency Standard. « Reply #55 on: February 05, 2012, 06:24:10 pm ». I think it means that the frequency may drift 2e-9 per year relative to initial value. So in one year, one could expect the frequency to be between 10 MHz* (1-2e-9) and 10 MHz* (1+2e-9), if it is initially exactly 10 MHz.

August 5, 2013. You can find rubidium frequency standards all over eBay and various surplus dealers. They're actually quite interesting devices, able to generate a 10 MHz sine wave with enough...

We present a dedicated microwave frequency synthesizer at 6.834 GHz in place of the commercial microwave signal generator. A phase-locked loop (PLL)-based direct digital synthesizer (DDS) generates a 134 MHz signal, which is mixed with a 6.7 GHz signal output from a phase-locked dielectric resonant oscillator (PDRO), to deliver a …

Ebay has rubdium frequency standards for under $100.00 and there are also GPS disciplined OXCO frequency standards for ~$150.00 . My question : Is a 10-20 year old rubidium standard more accurate (even with aging drift) that a newer GPS disciplined OXCO? I can't afford a GPS corrected rubidium standard ( ~$700.00+).

Time Forum, Geneva, Switzerland, 2007, pp. 1127 ... The rubidium atomic frequency standard (RAFS) and the passive hydrogen maser (PHM) are at present the baseline clock technologies for the ...

14 Comments. by: Al Williams. December 5, 2023. We think of crystals as the gold standard of frequency generation. However, if you want real precision, you need …

PRS10 Rubidium Frequency Standard Theoretical Overview of Rubidium Frequency Standards Rubidium is an alkali metal (like lithium, sodium, potassium and cesium). There are two naturally occurring isotopes of rubidium, Rb85 and Rb87, which have relative abundances of 72% and 28% respectively. The metal has a melting point of 39°C.

Oscillator, an AC Power Supply and a built-in Frequency Counter. The Standard is built into a Collins case (with cover) that in an. earlier life held some TelCom Test Equipment. The picture shows the RBO connected to both it's internal Counter. and my external HP Counter (that has a GPSDO as it's Reference). Asking $195 plus shipping from 85641.

Advantage of 1 is low phase noise. Disadvantage of 1 is that output frequency is fixed. Advantage of 2 is output frequency is adjustable. Disadvantage of 2 is relatively high phase noise owing to ultimate frequency being result of DDS. My understanding is PRS10, FRS, LPRO, LPRO101 are type 1. On the other hand, FA5650, …

A History of the Rubidium Frequency Standard. View Document. PDF 3.92 .

Presented is a double-resonance continuous-wave laser-pumped rubidium (Rb) atomic clock with a short-term stability of 4×10 −13 τ −1/2 for integration times 1 s≤τ≤1000 s, and a medium- to long-term stability reaching the 1×10 −14 level at 10 4 s. The clock uses an Rb vapour cell with increased diameter of 25 mm, accommodated inside a newly developed …

#1. Hi all, I'm looking for some sort of frequency standard (10 MHz ref.?). Ebay has rubdium frequency standards for under $100.00. and there are also GPS …

The design, realization, and characterization of a compact magnetron-type microwave cavity operating with a TE 011-like mode are presented.The resonator works at the rubidium hyperfine ground-state frequency (i.e., 6.835 GHz) by accommodating a glass cell of 25 mm diameter containing rubidium vapor.

Re: Teardown & Repair of a Fluke PM6685R 4.5GHz Rubidium Frequency Counter. « Reply #4 on: September 04, 2017, 10:46:35 am ». Hi Shahriar, the repair was very interesting & good. OCXOs usually have about 1^-9 stability, whereas Rb are stable and can be trimmed to about 1^-11. So trimming an Rb at 1^-9 level, either against …

The recent redesign activities to eliminate obsolete parts in the RFS-IIF as well as improvements and updates to the PerkinElmer test facility funded by the USAF GPS Wing under the Rubidium Atomic Frequency Standard Modification (RAFSMOD) Program are discussed. PerkinElmer provides the rubidium frequency standards (RFS) for the …

Finally, we measured the absolute frequency of the rubidium clock transition and found that it agrees well with prior measurements. 2. Materials and Methods. ... Proceedings of the 2019 Joint Conference of the IEEE International Frequency Control Symposium and European Frequency and Time Forum (EFTF/IFC); Orlando, FL, USA. 14–18 April 2019 ...

Say you had a typical even MHz frequency crystal say 4 - 20 MHz, that was TTL buffered and divided down so you. could flash an LED at 1 Hz, and you also had a …

Frequency stability better than 2 kHz has been demonstrated on time scales between 1000 s and 2 days both at 1560 nm, twice the rubidium wavelength, and for a comb line at 1557 nm. Combining light modulation and frequency conversion techniques, a compact and simple frequency-stabilized optical frequency comb spanning over 45 nm …

Lamp-pumped rubidium atomic frequency standard (RAFS) is one of the most commonly utilized atomic frequency standards. Over the past few decades, the RAFS's frequency stability performance has improved rapidly, and the best one has been in the $10^{-13} tau ^{-1/2}$

Rubidium frequency standards based on the EFRATOM FRK modules usually have the facility to measure 'Lamp Voltage'. Does anyone know what is actually …

Re: AT&T - Efratom RFG-RB Rubidium Frequency Standard. Thanks for the reply. The unit I purchased is identical to the one in the link but says AT&T in place of the Lucent badge. I have been unable to find any users or operation manuals on this unit, the only info I can find just refers to the units ability to ad a slave unit and or a GPS …

Really nice Ball Efratom PRFS-102 Rubidium frequency standard for sale. Works perfectly, locks in under 3 minutes (spec is 6 minutes) Last calibrated in 2016 Photos shows the 10 MHz, 5 MHz and 1 MHz outputs. My Fluke counter is using my SRS FS725 as a reference Comes with op/service manual and FRS package op/service manual Asking …

FS [US], Spectratime Rubidium Frequency Standard SRO-100 10MHz - Page 1 EEVblog Electronics Community Forum A Free & Open Forum For Electronics Enthusiasts & Professionals

Typically, divide the 10MHz GPSDO signal to get 1MHz, do the same with the Rubidium, compare the phases over several hours. The GPSDO phase can move back and forth by many nanoseconds (can be over 100 with poor GPS reception) so comparing at 10MHz can be a problem. For instance, if the GPSDO phase is 100ns out at the start of a …

In this article, a new type of physics package with high signal to noise ratio for a rubidium atomic frequency standard is reported. To enhance the clock transition signal, a slotted tube microwave cavity with a field orientation factor of 0.93 and an absorption cell with the diameter of 30 mm were utilized in design of the cavity-cell …

FS: Datum Efratom LPRO 101 Rubidium Frequency Standard, calibrated, with PCB kit. LPRO 101 clock is a classic product in the field, the most valuable kit for the electronic fans, even the others try to copy it, just like FE5682A, XHTF10034 etc, you can compare the KPI (aging tolerance of frequency, phase noise, MTBF etc), since the …

A voltage-controlled oscillator excites the cell with a 6.8 GHz signal. Rubidium atoms can exist in three states. Because of a filter in the system, the cell will eventually reach a steady state ...