Re: [time-nuts] Test WWV timecube against Cesium, Rubidium, MASER or other precision time (UT-1) metrology

kb...@n1k.org said: > To get the accuracy into the 1 ms range on WWV, you would need a pretty good > idea of the path length between you and WWV. Dave Mills has a program to compute delays. * By default it prints out a summer (F2 average virtual height 350 km) and * winter (F2 average

Re: [time-nuts] Symmetricom X72 interface boards

Mark,Got mine today. Looks great. Will test it on the weekend. Thanks for the good work.Steve On Wednesday, December 6, 2017 10:07 PM, Mark Sims wrote: The X72 rubidium oscillator interface board sets have (finally) been shipped to everybody that paid for them.  I

Re: [time-nuts] Test WWV timecube against Cesium, Rubidium, MASER or other precision time (UT-1) metrology

I have done some frequency measurement testing of WWV transmissions against a not that great reference. Results are shown on https://sites.google.com/site/perseusmods/home/performance They are pretty awful even compared to a not that great reference. The Ionosphere is not friendly. Mark W7MLG

Re: [time-nuts] Test WWV timecube against Cesium, Rubidium, MASER or other precision time (UT-1) metrology

The timecube radios were simple superheterodyne AM receivers. I suspect the group delay of the timecubes will be small and fairly consistent due to the low component count, Yet because of the low quality components performance variability between units will be quite high. A more

Re: [time-nuts] Test WWV timecube against Cesium, Rubidium, MASER or other precision time (UT-1) metrology

Hi If you happen to pick 5 or 10 MHz as your target frequency, all sorts of interesting things come into play. The first is that any 5 or 10 MHz local standard distribution may well get into your receiver. That can create all sorts of odd effects as the signal fades. Next is that you aren’t

Re: [time-nuts] Test WWV timecube against Cesium, Rubidium, MASER or other precision time (UT-1) metrology

One way to compare any WWV receiver to a local standard is to use the PPS output of a standard against the PPS tick modulated on WWV. The tick is five cycles of a one KHz signal derived from the master frequency. See https://www.nist.gov/pml/time-and-frequency-division/time-services/wwv-a

Re: [time-nuts] Test WWV timecube against Cesium, Rubidium, MASER or other precision time (UT-1) metrology

Pat Way back in the 90s I measured the color subcarrier frequency of geostationary satellites. That aren't actually stationary. I knew the quality of the subcarriers for a number of the networks since we originated the signals. CBS was Cs others were Rb and still others various Xtals. I had direct

[time-nuts] Test WWV timecube against Cesium, Rubidium, MASER or other precision time (UT-1) metrology

Hello Friends, I am picking up locally a couple of vintage analog Radio Shack SW time cube radios, 70s vintage, 3 switchable SW frequencies. Two types, the one pictured and a Radio Shack model also that has WWV and Weather channel VHF frequencies. I am interested in an accurate bench test to