[time-nuts] LORAN-C
wa1zms at att.net
wa1zms at att.net
Tue Nov 13 00:01:23 UTC 2007
Stan's comments below about his noted errors between
LORAN & GPS that range from E10 to E13 each day remind me
of the similar errors that I have observed.
I had originally attributed them to ground-wave vs. sky-wave
propagation on the LORAN side. But I know that the LORAN
system encoding is intended to be resistant to such propagation
situations.
I have not made the effort to fully quantify my particular
measurements. But I do routinely observe my Austron 2100F
showing an almost diurnal change in displayed error when
using it as the measurement system against an HP-5061 or Z3801A.
Can someone confirm that the E10 to E13 errors are typical
of the 2100F? And what ultimate long-term stability have others
been able to achieve using LORAN as a reference?
Thanks in advance,
-Brian, WA1ZMS
-----Original Message-----
<snip>
I have gotten a 4 parts in E13 comparison between the LORAN-C and the
GPS disciplined oscillator,
at least for a short time, multiple times a day.
Most readings are between E10 an E13 comparing the GPS DO and the
Loran-C RX.
probably bouncing due to the propagation paths and propagation
perturbations.
<snip>
Stan, W1LE FN41sr Cape Cod
nnovotney at cinci.rr.com wrote:
>Hello:
>
>My different types of equipment (scope, freq cntr, spec analyzer, etc)
never seem to be right on the money, so I decided to run them all off a
commnon exact 10MHz rubidium source.
>
>I got an FE-5680A (was on a chopped off ckt board-whcih is apparently part
of some motorola system pcb)..I hooked pin 1 to +15V & pins 2 to gns ...but
nothing came out any of the other pins?!?? Where is the output? Do I need
another cxonnection? I read you might need to apply +5v, but don't want to
try unless I know what I'm doing. How do you determine what option your
unit has? It looks like about 60 options are possible!! By the way, with
my spec analyzer probe nearby I am sniffing the 6.834xx GHz signal-so the Rb
is in there doing its thing.
>
>As a second note, as I read around here, it seems (to my understanding)
that the Rb osc is not exact--that in fact it needs calibrated!! Well, I
dont't want to cal it --I bought this "atomic clock" to let me cal all of
my various xtal oscilators. How on earth shall I cal this thing? If I
don't cal, how far off is it? Can i count on 9 digits of accuracy with "no
cal"
>a
>thanks for your hints & direction....I think I'll enjoy this group & hope
to make some contibutions once I get going.
>
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>
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