Re: [time-nuts] HP5061B Versus HP5071 Cesium Line Frequencies

Direct multiplication to 9192 MHz isn't used by any manufacturer of any atomic clock that I know of, due to its well known disadvantages. I can state for a fact that it was summarily rejected by the designers of the 5060/5061 (Cutler, et al). In the 5071, I (being the RF designer) also summarily

[time-nuts] HP5061B Versus HP5071 Cesium Line Frequencies

https://www.febo.com/pipermail/time-nuts/2017-May/105566.html The lock system on the HP5071 is complex and expensive. My plan to improve the HP5061B is to to use a pair of third overtone crystals running at 91.9 mc and 100 mc. I have come up with the magic numbers to lock them together. This

[time-nuts] "For parts" Brandywine GPS-4 on Ebay.

If somebody on the list bought that "for parts" Brandywine GPS-4 off of Ebay, I can tell you it has something wrong in the oscillator or EFC circuit. It reports an OCXO failure alarm and DAC voltage at the lower limit. The oscillator is unmarked. It is around 2"x2"x1.25" I believe it has a

Re: [time-nuts] The future of Telecom Frequency Standard surplus

> On May 31, 2017, at 7:07 PM, Bob kb8tq wrote: > > Many systems are indeed going to much tighter holdover numbers. That is > requiring either a much better OCXO or an Rb as a holdover So sync limits are going down. 4G-TDD has a node to node limit of 3µs / node to UTC of

Re: [time-nuts] The future of Telecom Frequency Standard surplus

Hi The flip side of this is that the number of hardware junkies is not increasing. The world is moving to software as the way to do things. As we all move on, our giant piles of stuff will have to go to somebody (or the landfill). Most of this stuff is built to last a *long* time. There are a

Re: [time-nuts] The future of Telecom Frequency Standard surplus

I think there will be fewer useful parts. The reason is integration. In the old days they would buy off the shelf equipment like a GPS receiver that was inside its own box and was cabled to something else. A better newer design would be to use a "GPS Chip" can route the output not using a