I believe > the original FCS paper on them was around 1990. I found the use of the different tempco dependence of the 1st and 3rd modes an interesting way of measuring the temperature-dependent shift. By having a dual-mode oscillator setup and then mix the 1st mode frequency with the divided down version of the 3rd and then measure the beat-frequency.

. > > Compare, for example, the HP5087, a so-so design, to the > output amplifier design in the 5071A cesium, as documented > in my FCS paper in 1992. Huge difference in specs. The > 5071A has 120 dB isolation between outputs. > > Rick Karlquist N6RK > > > Rick Did you mean a high return loss or equivalently low reflection coefficient?

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(This is FC!?, right?) > Result: 64,257,1347,1264 (unit1), 59,233,2569,2611 (unit2) > DS? > Result: 1070,1124 (unit1), 1053,983 (unit2) I'm a bit surprised by the first number here. I wonder why that's so high - the manual indicates they should oscillate around 0. Those second numbers are nice and high though. > AD9?