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Re: VLF: Night-transmission on 8270.1 Hz

To: [email protected]
Subject: Re: VLF: Night-transmission on 8270.1 Hz
From: Jacek Lipkowski <[email protected]>
Date: Sat, 19 Jan 2019 23:23:29 +0100 (CET)
In-reply-to: <[email protected]>
References: <[email protected]> <[email protected]> <[email protected]>
Reply-to: [email protected]
Sender: [email protected]
User-agent: Alpine 2.11 (DEB 23 2013-08-11)
The spectrogram is here:

For now it will update every 1 hour, and for now i will leave it updating, maybe Stefan would like to draw another nice bright line there?
VY 73

Jacek / SQ5BPF

On Sat, 19 Jan 2019, DK7FC wrote:

Date: Sat, 19 Jan 2019 19:47:27 +0100
From: DK7FC <[email protected]>
Reply-To: [email protected]
To: [email protected]
Subject: VLF: Night-transmission on 8270.1 Hz


Since 18:14 UTC i am transmitting on the ground loop antenna again, this time on 8270.1 Hz, where RN3AUS is watching from near Moscow! After the recent very strong signal at SQ5BPF in 976 km distance i like to know if the signal can make the 2040 km path to Alex as well? It is in the same direction that SQ5BPF but more than twice the distance. Will this work? Because the antenna is beaming towards Paul and has its null into the direction to SQ5BPF and RN3AUS. Anyway the strong signal in Poland...
Now i'm sitting in my car here, the sky is clear, the moon is full and it is
below 0 C here. I have some tea which is still warm, more or less. The DC
measurement at the loop tells it has just 57.5 Ohm at f=0! That is the lowest
value i measured so far.
The accu display tells me: 12.8V, 40.9A, 524 W, 85% rest capacity and about
2.5 hours rest time left at this power level. I can measure the antenna
current with a Rohde&Schwarz scope using the spectrum analyzer function. It
tells me -6.3 dBV of the fundamental frequency, measured across a 0.2 Ohm
shunt resistor, so that is equal to 2.42 A antenna current.
Unfortunately the frequency is not covered by Paul's excellent grabber. Maybe
he can give some informations about the signal strength? It should be my
strongest signal since the kite experiments in 2011.
The carrier will stay on the air for 2 hours.

Al reports are welcome.

73, Stefan

PS: Feet and tea cold now...

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