Stefan DK7FC has been recently transmitting on 6470Hz (46km wavelength) from a stationary antenna between two buildings.
The Ebnaut transmissions were received by Paul Nicholson (England) and Jacek SQ5BPF (Poland) at a distance of 900km (IN49IK to KO02MD).
Transmission from 13 april 2017, decoded message was: “GL”.
f = 6470.100000 Hz Start time: 13.Apr.2017 22:00:00 UTC Symbol period: 36 s Characters: 2 CRC bits: 18 Coding 16K21A Duration: 8h Antenna current: 460 mA
Ebnaut decoder output:
found rank 2 ber 4.0375e-01 Eb/N0 3.3 M -1.230747461e+00 [GL] ps [ 3 -150 -150 -150 -150]
carrier phase: 3.1
carrier Eb/N0: 2.4
carrier S/N: 12.98 dB in 34.7 uHz
elapsed 228
Transmission from 19 april 2017, decoded message was: “OK”.
f = 6470.100000 Hz Start time: 19.Apr.2017 19:00:00 UTC Symbol period: 30 s Characters: 2 CRC bits: 20 Coding 16K21A Duration: 6h, 56m Antenna current: 460 mA
Ebanut decoder output:
found rank 11 ber 4.3510e-01 Eb/N0 -0.1 M -1.023133636e+00 [OK] ps [ 32 -60 -60 -30 -30]
carrier phase: 8.7
carrier Eb/N0: 1.6
carrier S/N: 12.12 dB in 40.1 uHz
elapsed 218
The 6470Hz is an interesting challenge compared to 8270Hz, which is much easier to receive at this distance.