Hi VLF
May be too late
L
I have just started FFT recording with SLab
Not sure if the settings are correct for your transmission
In File Export Format > Export of FTT results>
Number of exported FFT bins 1204
frequency of first FFT bin 0.0
Max file size in Kb 0 (unlimited)
FFT Settings:
Effect of FFT settings with fs= 1.37175 Hz:
Width of one FFT-bin: 41.8625 uHz
Equiv. noise bandwidth: 62.7938 uHz
Max freq range: 8.26966 kHz .. 8.27034 kHz
FFT window time (length): 6.635 hrs
FFT window overlap: 74.9 %
73 de Luis
EA5DOM
VLF,
My new VLF coil is now in operation. It is designed to run 300 mA. The first station where i like to transmit some messages is 8270 Hz, just because 36 km it is the easiest band on the VLF frequencies available for us. The idea is to transmit at least 100 hours
on each band down towards DC, just to proof the design.
Does someone like to join the experiments, RX or TX wise?
I'm going to start a first transmission tomorrow morning using EbNaut:
f = 8270.005000 Hz
Start time: 22.September.2017 06:00:00 UTC
Symbol period: 24 s
Characters: 12
CRC bits: 16
Coding 16K21A
Duration: 11h,31min,12sec
Antenna current: 300 mA
73, Stefan
