Hello Paul, Domenico, group. The VLF aerial was lowered Tuesday in
anticipation of a sleet storm and the LF tx was switched off yesterday
due to a mismatch caused by tower icing. The LF toploading has been on
the ground since being iced down on 17 April. The 'M' on the message
stands for 'monopole'.
It seems the durnal phase inversions have returned on VLF. I have not
seen this since autumn past. The carrier peak has been much weaker
than the sidebands at +-12 uHz on spectra from Paul's 8.27 kHz spectrograms.
If the tower survives tonight, the transatlantic LF and VLF serivce may
resume tomorrow. Thanks to all for the reports and detections.
73 Joe VO1NA
On Thu, 25 Apr 2019, Domenico IZ7SLZ wrote:
VO1NA activity on LF picked up in JN80nu (only one decode yesterday):
2019-04-24_03:00:00 137477.000Hz N=7 T=3s 8K19A CRC=16 list=2000 sym=608
Duration=1824s
T_OFFSET=0.0s F_OFFSET=0.000Hz
initial reference phase 70.4 amplitude 3.587e-01
carrier phase: -2.5 deg
carrier Eb/N0: -0.7 dB
carrier Es/N0: -12.53 dB
carrier S/N: 15.31 dB in 548.2 uHz, -17.30 dB in 1Hz, -51.28 dB in 2.5kHz
found rank 93 ber 3.8651e-01 Eb/N0 -2.0 M -9.626523733e+00 ph 5
150,150,150,150 *[10W___M]*
carrier phase: 13.2 deg
carrier Eb/N0: -0.3 dB
carrier Es/N0: -12.17 dB
carrier S/N: 15.67 dB in 548.2 uHz, -16.94 dB in 1Hz, -50.92 dB in 2.5kHz
found rank 52 ber 3.7993e-01 Eb/N0 -1.5 M -9.774923086e+00 ph 21
150,150,120,120 *[10W___M]*
------------------------------------------------------------------------------------------
Receiver restored in my remote location after many weeks of inactivity, but
no internet at moment.
73, Domenico IZ7SLZ
On Thu, 25 Apr 2019 at 17:35, Paul Nicholson <[email protected]> wrote:
I haven't seen Joe's signal since about 06:00 UT on the 23rd.
Transmitter down?
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Paul Nicholson
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