[time-nuts] common mode loran comparisons
tom jones
epoch_time at yahoo.com
Sat Jun 2 12:09:56 EDT 2007
I'm getting great results monitoring daily phase changes of the fallon loran master station.
I don't have any computer logging from my austron 2100's but manual readings taken several times a day show 10 to 30 nanosec of phase change throughout the day and about 0 to 10 ns day to day and about 0 to 30ns week to week.
I have an hp-5061 providing reference for two seperate 2100's one f model the other is the timing type.both austrons readings agree with each other.
I also have sirf type 1pps gps receiver that agrees with the long term phase changes of all the above.
The reading are good enough to participate in common mode measurements with fellow time-nuts that have cesium and austron 2100 loran monitors.
I'm using a funaro 80 marine loran as an antenna pre-amp for the 2100's coupled by capacitors.to the austron. Any old loran that has two wire antenna coupler could be used as a preamp for the austron 2100.
The austron 2100 does not provide power for said coupler so you should use matching receiver thats belongs with antenna coupler.
My antenna is indoor and works fairly well without preamp but works better with furano loran preamp. I've never owned the orignal antenna designed for the austorn 2100 but assume it works well.
My recent data;
Time loran1 loran2 gps date doy
12:24 -013 -025 772 5-27-07 147
15:00 -011 -024 784 5-27-07 147
06:13 -014 -026 759 5-28-07 148
09:43 -014 -026 771 5-28-07 148
14;07 -010 -023 799 5-28-07 148
20:11 -009 -022 807
05:28 -013 -025 775 5-29-07 149
10:25 -014 -028 743
18:06 -016 -029 739
21:40 -013 -026 760
05:27 -015 -028 745 5-30-07 150
06:14 -016 -028 754 5-31-07 151
07:25 -018 -031 722 6-01-07 152
07:13 -014 -027 777 6-02-07 153
I would enjoy comparing this measured loran data with someone elses.
Nist & unso aren't monitoring chain 9940 so I need help from fellow time-nuts.
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