Hi VLF,
This is all very impressive. Congrats to Dex, Joe, Paul and all involved
RX stations. I bet that Alex can decode the message too, when two or 3
days are stacked. I think that 2 days will be enough. And 16K21A, CRC20
is a good choice!
I've just been away for 2 days or so and could write many congratulation
mails now :-)
Unfortunately there are not many stations in the east, seen from here.
In Japan there have been good RX stations on LF. They could try to
receive VLF too, but obviously they are not here any longer...
73, Stefan
Am 27.12.2017 08:21, schrieb Paul Nicholson:
W4DEX wrote:
> 3 chars 16K21A CRC20
> 30 second symbols
> Start 22:30 UT
Success!
Decoded 'QRZ' at Cumiana (IK1QFK) with
Eb/N0 = +0.4 dB, BER 41.6%;
S/N -31.7 dB in 1Hz, -65.7 dB in 2.5kHz
(after sferic blanking);
List rank 5689, constant reference phase;
Distance is 7173.4 km which is a new world record for
VLF message decode and a record distance for EbNaut
at all bands.
Predicted Eb/N0 was +0.6 dB.
Decoded via the live VLF stream from Renato's E-field
receiver.
These two stations already hold the record distance for
carrier detection at VLF. This result extends that to
a message decode.
Signal data available in vlfrx-tools format:
http://78.46.38.217/w4dex-171226-vlf15.vt
Decode with
vtraw -oa w4dex-171226-vlf15.vt |
ebnaut -dp16K21A -r1 -S30 -k20 -N3 -v -PU -L500000
Congratulations to both stations for a great result.
--
Paul Nicholson
--
|
