On Sun, 11 Oct 2009 12:10:36 +0000, Mark Sims wrote: >Alas, if there was only an FM to R... there is some useful information in the revision history/comments near the beginning of the file heather.cpp >The OSC graph defaults to OFF because it tends to be a very jagged and noisy looking graph that gets rather annoyingly in the way of things.

I remember to all these strange mmH, µµF etc. when I collected > >rare inductors, capacitors revovered from vintage MIL- equipment in > >the end fifties/ early sixties of last century ... :-) > > > >I believe that Time Nuts prefer precise and clear expressions!? ;-) > >What do you think about it?

The original drawing had a mil-spec > yellow > band resistor of value X in the front end. Well, with that resistor the NF > could not be met. They could meet it with a value Y. Pleading with the > government reps made no difference.

Alan G3NYK ----- Original Message ----- From: "Brooke Clarke" To: "Discussion of precise time and frequency measurement" Sent: Tuesday, November 18, 2014 10:31 PM Subject: Re: [time-nuts] 10811 > Hi Rick: > > When working on Tunnel Diode amplifiers we used (AFAICR) 5.1 V Zener > diodes to stabilize the lower voltage

A lot of mil-spec relays use this trick and I've seen problems where relay swapping for fault finding has swapped a low level with a power and back. No initial problem, but months later the contacts have gone high. Then there was the supplier who tested all the new relays - under load, DOH!

Bob > On Nov 23, 2014, at 11:47 AM, Bill wrote: > > What's the latest opinion (data) on available low additive phase noise 10 > MHz amplifiers for 10 MHz distribution?

On a mil device, an upper end > >>>>>>>>> temperature > >>>>>>>>>>>> on > >>>>>>>>>>>> the equipment likely would be over 70C.

They have a local 5 MHz OCXO > locked through a interesting gear with the incomming 5 MHz > and a DDS to result in a 10 kHz comparision frequency for the > phase detector in the loop. The gear acheives a 512000 > increase in gain (1024 from gear-works as such and 500 from > the ratio of 5 MHz and 10 kHz).

It would not de-correlate over the 10 mm run length, not at low offsets where it counts. The -110 was only meant for "Don't care about multiplied white noise floor", not in the sense of a spec but in the sense of "guaranteed harmless". It's not such a great relaxation after all, it could be 20 dB looser.

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