Hi Paul, VLF,
Am 07.05.2016 12:41, schrieb Paul Nicholson:
I'll
have a look now at your 6480 carrier to do some more
adjustment.
There was another carrier from 09:45...19:45 UTC today on 6470 Hz.
Continuing
to try for your first message but I'm probably
still 2 or 3dB short.
A real challenge! There will be more.
The
day/night phase change isn't a problem
Not? Oh, ok, so let me start another transmission:
f = 6470.000 Hz
Start time: 07.05.2016 20:00:02 UTC
Period: 100 s
Length: 19
CRC 16
Coding 8K19A
Duration: 32h, 53m, 20s
Antenna current: 200 mA
It is my longest transmission EVER! If this message comes through on
the 46 km band, it would be amazing (even more).
Then i would start to prepare the system for 5.17 kHz!
Currently i am output transformer limited :-) I need a new one for 5.17
then. The spacing between the coils will be higher so i can run more
antenna current, 280 mA again. So i need more voltage on a lower
frequency. Calls for a larger ferrite core!
interesting that it
isn't less than at 8.27 kHz but it's complicated at these
short ranges.
It's a distance of 19 lambda between us.
73, GL, Stefan
|
|
