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Re: VLF: EbNaut transmissions on lower frequencies?, pre-tests: 6.47kHz

To: [email protected]
Subject: Re: VLF: EbNaut transmissions on lower frequencies?, pre-tests: 6.47kHz
From: DK7FC <[email protected]>
Date: Sat, 07 May 2016 22:11:35 +0200
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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
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
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