Hi, Joe !
No...:
Usually the accuracy is something about +- .02 Hz, maybe better. I use
the 137,778.370 Hz Loran-C sideband line (GRI 7499) for calibration and
monitoring purpose, but, last night, unfortunately, this line disappeared,
I don't know why, perhaps the maintenance scheduled in Lessay and Soustons
?
I was using the DL4YHF SpectrumLab with FFT input size 32768, decimate
input by 64, along with the "one pixel per FFT bin option", the windows
was open from 137,776.70 to 137,780.33 Hz, and the next line (GRI 6731 -
137,780.419 Hz), if there, was outside the spectrogram.
With these options, the steps are labelled each .1 Hz, and the distance
between two steps is more than 1/4 inch large on the screen, so it is
easily possible to extrapolate .01 Hz. When the temperature is
stablilized, and this needs about 1-1/2 or 2 hours, the Loran lines are
moving less than .01 Hz in the spectogram.
I fully agree with Markus DF6NM about the usefulness for us of the Loran
sidebands.
But, anyway... May somebody else on the reflector confirm the frequency ?
Best 73 Joe and all, thank you from all of us for running the beacon !
F5YG
On Thu, 13 Apr 2006, Joe Craig wrote:
On Thu, 13 Apr 2006, Jean-Pierre Godet wrote:
And here JN09XI only traces of 2XGJ abt 0245 - 0345 z 137,779.76 Hz, and
traces of N from NA (?) 0250 -0320 z 137,773.03 Hz.
Hello Jean Pierre,
Are you sure about that frequency? It is normally 137.7770 kHz.
Thanks to Jean Pierre F1AFJ, Hartmut and Gary G3WGT for the reports.
The TX was switched on last night at time Gary first reported reception.
73 to all
Joe
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