Hi all,
in past weekend I experimented monitoring DCF39's signal with Spectran
(the Beta 2c version seems to work well).
I receive the sky wave, since the Alps stop the ground wave. The result
is that the signal has random amplitude and phase, and there is no
increase in visual S/N decreasing the bandwidth under 0.064 Hz.
A screenshot of the resulting signal is available. Probably also the
FSK modulation contributes to the line spreading observed; the other
tone is well outside my spectrogram, but there seems to be a coincidence
between data packets and noise +/- 1 Hz around the carrier.
I also measured the carrier frequency. It is very close to 138830 Hz; the
error is probably less than 0.1 Hz, so if anyone in the States is able to
carefully check the received frequency, the identification should be quite
sure,
even without hearing the modulation by data packets.
73 - Marco IK1ODO
[email protected]
Rivalta, ITALY JN35SA (N 45 01' 25.6", E 7 31' 09.4")
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