From Peter G3PLX:
No, I didn't see it go off either. The first Tuesday in the month is
documented as the Rugby maintenance period, but perhaps the grass didn't
need cutting this month because the weather has been so cold.
I have written a little program which will measure the SNR of the LORAN
signal on 137kHz, by comparing the amplitude of the signal-plus-noise to the
amplitude of the filtered and smoothed LORAN pulse alone.It can be done at
any time and doesn't need to wait for them to turn it off and on. The
program requires that the soundcard and the receiver frequency should be
accurately calibrated, but the tools for doing this are contained within the
program, using the LORAN signal itself as a timing and frequency standard.
I need to do some beta tests first, then I will be asking for volunteers to
use it to measure the LORAN SNR at various places around the UK and NW
Europe. The results can be passed to John G3WKL and will be useful in any
campaign to get something done about the LORAN interference on 137kHz.
73
Peter
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