Click on the image for a larger version. Why a frequency reference? When operating on the microwave amateur radio bands, narrowband modes such as SSB or CW are often used to maximize the link margin - that is, be able to talk when signals are weak as the SSB or CW modes can offer 10's of dB improvement over the wide FM modes used with Gunn transceivers. Having to "chase" the frequency around is not only distracting, but it complicates being able to communicate in the first place. Accuracy is also critical because it is important that both parties be confident that their stated operating frequencies are reasonably close to where they think they are, frequency-wise. If a contact is arranged beforehand, it is vital that both parties be able to find each other simply by knowing the intended frequency of communication and as long as the two parties are within several hundred Hz of each other, it is more likely that they will be able to complete the contact.

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Print Search. Not sure if it is similar on other ebay's around the world? Any idea how long before you will have a complete unit available? The following users thanked this post: Synthtech. Quote from: testpoint1 on March 17, , pm. For metrology grade-ish measurements you'll need to add an extra oscillator to clean the 10MHz and add a circuit to derive the 1PPS from the 10MHz directly.

There are small lies, big lies and then there is what is on the screen of your oscilloscope. Kosmic Super Contributor Posts: Country:. Do I need one? Is the heatsink mandatory? Edit: I should have read the listing. The 10 years tolerance is probably since last calibration.

If you calibrate on a regular basis with a gpsdo it's probably not a problem. OK can't resist anymore, just bought one. Quote from: nctnico on March 17, , pm. Frank Super Contributor Posts: Country:. Folks, Of course you can calibrate an Rb standard down to 10 , using a GPSDO, but you have to use long averaging times, or the appropriate method. After 2h warm up, no Rb will be stable enough to be calibrated to 5x10 It takes And yes, a sufficient heat sink is mandatory..

Quote from: beanflying on March 17, , am. The following users thanked this post: Mr. Scram , beanflying. Quote from: Dr. Frank on March 17, , pm. Quote from: Kosmic on March 17, , pm. The following users thanked this post: Kosmic. Quote from: testpoint1 on March 18, , am. Quote from: Mr. Scram on March 18, , am.

Quote from: Mechatrommer on March 18, , am. The following users thanked this post: Mechatrommer. There was an error while thanking. SMF 2. EEVblog on Youtube.


EFRATOM LPRO-101 adjusting

Some weeks ago you could buy it for less than 80 USD. Not so if you are ham operator and playing around with micro wave equipment or if you try to use this frequency standard as stratum 0 source for a NTP server. As you can easy calculate this clock would go wrong about 3 seconds per year. This is not much better than a quartz watch. It is easy if you have a second 10 MHz reference which is much more precisely. Running this after several hours I could see. So I produced a screw driver those one I have owned were to short and turned the potentiometer clockwise for 90 degrees.


With Arduino. SFDR Visualizer. The calculations are all done with Javascript. You turned it off, so they do not work. As there is almost everything done, we may use the space and time saved to build an interface with some additional features. An Atmega 8 reads some analog voltages like supply or lamp voltage and feeds an lcd with the data.


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