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Date: Wed, 31 Jan 2018 14:30:32 +0100
From: DK7FC <selberdenken@posteo.de>
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Subject: ULF: New experiment on 970 Hz 1/3
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Hi all,

Since yesterday, ~ 17 UTC, i'm running a new portable experiment on 970 
Hz, or the 309 km band. The receiver site is somewhere in the forest in 
JN49BK <http://k7fry.com/grid/?qth=JN49BK>, a distance of  40 km to the 
TX site.

I carried a lot of accus to that location and the USB stick where the 
data is written on has 64 GB, so i can run the experiment for more than 
one week! :-)

For the first time i'm using two antennas. An active E field antenna 
with a 1.5 m long steel wire as the capacitive probe. It is mounted on a 
10 m high pole. The E field preamp is supplied by a separate battery and 
uses an isolation transformer with a low pass filter applied.
The second antenna is my compact loop with 80 cm diameter and 84 turns. 
It uses a low noise preamp (also supplied by a separate battery) using a 
LT1028. This loop RX worked surprisingly well on 4470 Hz when beeing in 
France last September. Hopefully it will pick up the signal.
Unfortunately the E field antenna is not very high above the 
sourrounding trees, so the sensitivity may be limited. Also the H field 
antenna showed much more mains hum than expected in this location. So it 
may be a bit questionable if the experiment will be successful. The long 
transmissions will allow to stack carrier transmissions and/or EbNaut 
transmissions though...

Running 36 mA antenna current means an *ERP of 10 nW* on that frequency.
My transmission plan is:
30.JAN, 17 UTC: Carrier on 970.005 Hz
01.Feb, 17 UTC: Carrier on 970.0025 Hz
02.Feb, 17 UTC: EbNaut, 16K21A, 2 char, 100 sec, CRC22 (24 hours)
03.Feb, 17 UTC: EbNaut, 16K21A, 2 char, 100 sec, CRC22 (24 hours)
04.Feb, 17 UTC: EbNaut, 16K21A, 5 char, 80 sec, CRC17 (23:49:20)
05.Feb, 17 UTC: EbNaut, 16K21A, 5 char, 80 sec, CRC17 (23:49:20)

Not sure if someone else can pick up the signal. Most likely not. But 
new components to rise the voltage to 20 kV in a next experiment are 
already in preparation...

73, Stefan


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Hi all, <br>
<br>
Since yesterday, ~ 17 UTC, i'm running a new portable experiment on 970
Hz, or the 309 km band. The receiver site is somewhere in the forest in
<a href="http://k7fry.com/grid/?qth=JN49BK">JN49BK</a>, a distance of 
40 km to the TX site.<br>
<br>
I carried a lot of accus to that location and the USB stick where the
data is written on has 64 GB, so i can run the experiment for more than
one week! :-) <br>
<br>
For the first time i'm using two antennas. An active E field antenna
with a 1.5 m long steel wire as the capacitive probe. It is mounted on
a 10 m high pole. The E field preamp is supplied by a separate battery
and uses an isolation transformer with a low pass filter applied.<br>
The second antenna is my compact loop with 80 cm diameter and 84 turns.
It uses a low noise preamp (also supplied by a separate battery) using
a LT1028. This loop RX worked surprisingly well on 4470 Hz when beeing
in France last September. Hopefully it will pick up the signal.<br>
Unfortunately the E field antenna is not very high above the
sourrounding trees, so the sensitivity may be limited. Also the H field
antenna showed much more mains hum than expected in this location. So
it may be a bit questionable if the experiment will be successful. The
long transmissions will allow to stack carrier transmissions and/or
EbNaut transmissions though...<br>
<br>
Running 36 mA antenna current means an <b>ERP of 10 nW</b> on that
frequency. <br>
My transmission plan is:<br>
30.JAN, 17 UTC: Carrier on 970.005 Hz<br>
01.Feb, 17 UTC: Carrier on 970.0025 Hz<br>
02.Feb, 17 UTC: EbNaut, 16K21A, 2 char, 100 sec, CRC22 (24 hours)<br>
03.Feb, 17 UTC: EbNaut, 16K21A, 2 char, 100 sec, CRC22 (24 hours)<br>
04.Feb, 17 UTC: EbNaut, 16K21A, 5 char, 80 sec, CRC17 (23:49:20)<br>
05.Feb, 17 UTC: EbNaut, 16K21A, 5 char, 80 sec, CRC17 (23:49:20)<br>
<br>
Not sure if someone else can pick up the signal. Most likely not. But
new components to rise the voltage to 20 kV in a next experiment are
already in preparation...<br>
<br>
73, Stefan<br>
<br>
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</html>

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