Message-ID: <5BF7C6B4.8090104@posteo.de>
Date: Fri, 23 Nov 2018 10:21:56 +0100
From: DK7FC <selberdenken@posteo.de>
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Subject: SLF: Carrier transmission at 80 Hz
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Dear SLF friends,

A new step forward towards DC: Since yesterday 22:30 UTC i'm TXing a 
carrier at *80.005 Hz*. That's the *3750 km band*, where the far field 
begins at a distance of 598 km.

The antenna voltage is just 5 kV and i'm getting 1.2 mA antenna current, 
giving an *ERP of  20 fW* (2E-14 W).

The voltage is even higher than in my recent experiment on 270 Hz, 
anyway the S/N is lower, indicating that my RX lacks of sensitivity. 
Indeed this experiment helps to estimate the lack of sensitivity. Looks 
like i'm missing about 10 dB on that frequency. Anyway the signal is 
making the path of 3.5 km to my tree grabber, as usual shown at 
http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.html. 
Not a big distance but still well beyond most garden fences!
The signal leaves a barely visible trace in the ZEVS window which is 
running at 3.8 mHz FFT bin witdh. Unfortunately ZEVS is off the air 
since a week or so. actually i wanted to transmit side by side with 
ZEVS, of course a bit deeper even.

 From a quiet period at night, i calculated the SNR of a 1 hour carrier 
period using vlfrx-tools: carrier *S/N: 16.83 dB in 277.8 uHz*, -18.73 
dB in 1Hz

For the crazy homebrewers i'd like to share that website where i ordered 
the HV-transformer, http://www.hosin.de/Specials/HV-Trafo/hv-trafo.html 
A nightmare for all safety-fetishists! For the completeness it must be 
mentioned together with that page: http://kurts-werkstatt.de/hv-trafo.htm

73, Stefan

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Dear SLF friends, <br>
<br>
A new step forward towards DC: Since yesterday 22:30 UTC i'm TXing a
carrier at <b>80.005 Hz</b>. That's the <b>3750 km band</b>, where
the far field begins at a distance of 598 km.<br>
<br>
The antenna voltage is just 5 kV and i'm getting 1.2 mA antenna
current, giving an <b>ERP of  20 fW</b> (2E-14 W).<br>
<br>
The voltage is even higher than in my recent experiment on 270 Hz,
anyway the S/N is lower, indicating that my RX lacks of sensitivity.
Indeed this experiment helps to estimate the lack of sensitivity. Looks
like i'm missing about 10 dB on that frequency. Anyway the signal is
making the path of 3.5 km to my tree grabber, as usual shown at
<a class="moz-txt-link-freetext" href="http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.html">http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.html</a>.
Not a big distance but still well beyond most garden fences!<br>
The signal leaves a barely visible trace in the ZEVS window which is
running at 3.8 mHz FFT bin witdh. Unfortunately ZEVS is off the air
since a week or so. actually i wanted to transmit side by side with
ZEVS, of course a bit deeper even.<br>
<br>
>From a quiet period at night, i calculated the SNR of a 1 hour carrier
period using vlfrx-tools: carrier <b>S/N: 16.83 dB in 277.8 uHz</b>,
-18.73 dB in 1Hz<br>
<br>
For the crazy homebrewers i'd like to share that website where i
ordered the HV-transformer,
<a class="moz-txt-link-freetext" href="http://www.hosin.de/Specials/HV-Trafo/hv-trafo.html">http://www.hosin.de/Specials/HV-Trafo/hv-trafo.html</a> A nightmare for all
safety-fetishists! For the completeness it must be mentioned together
with that page: <a class="moz-txt-link-freetext" href="http://kurts-werkstatt.de/hv-trafo.htm">http://kurts-werkstatt.de/hv-trafo.htm</a><br>
<br>
73, Stefan<br>
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