In your FE-5650A rubidium frequency standard, being “locked” means the electronics have successfully tuned the oscillator so that its frequency is being controlled by the rubidium atoms, rather than merely…
The page above is describing one of the most useful ideas in electronics: a Phase-Locked Loop (PLL). The terminology makes it sound considerably more complicated than the basic idea. PLL…
Many manufacturers produce these devices which as cheap and easy to install.
Your instinct is understandable, but there is an important difference: wind chill does not make an ordinary thermometer read a lower temperature than the actual air temperature. It makes your…
A rubidium time source is slightly misnamed: fundamentally it is an extremely stable frequency source. Your FE-5650A, for example, produces a very accurate output such as 10 MHz. Electronics can…
Yes. A small 1420 MHz test transmitter can be a useful way of checking a two-dish interferometer, but there is one important complication: if you walk close to the dishes,…
No. Side lobes and interferometry fringes are different things, although both arise from interference/diffraction effects. There is an important connection: the observed response of a two-dish interferometer is essentially the…
Yes. Pointing accuracy still matters in interferometry, even if the timing between the two receivers is perfect. The important distinction is: TIMING Determines whether the signals from the two dishes…
A tuned Yagi can be used as the feed for a parabolic dish, including at 1420 MHz, but it is usually not the best choice. The important point is that…
INTERFEROMETRY - WHAT HAPPENS IF THE DISHES ARE MOVED CLOSER TOGETHER? DISH 1 DISH 2 \ / \ / \ / \ / |<------ BASELINE ---->| MOVE DISHES CLOSER TOGETHER…
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