[time-nuts] LORAN-C

Brooke Clarke brooke at pacific.net
Tue Nov 13 01:14:30 EST 2007


Hi:

Here is a plot from 0 to 200 kHz that shows LORAN-C, WWVB and the interfering 
military RTTY stations. http://www.prc68.com/I/Images/AMRAD_BT.GIF
Ext Ref is the GPS locked PRS10 Rb.

Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.precisionclock.com
http://www.prc68.com/I/WebCam2.shtml 24/7 Sky-Weather-Astronomy Cam


wa1zms at att.net wrote:
> ); SAEximRunCond expanded to false
> Errors-To: time-nuts-bounces+brooke=pacific.net at febo.com RETRY
> 
> 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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