Message-ID: <5.1.0.14.0.20020630153034.00a58e60@POP3.freeler.nl>
Date: Sun, 30 Jun 2002 16:40:51 +0200
To: "LF-Group" <rsgb_lf_group@blacksheep.org>
From: "Dick Rollema" <d.w.rollema@freeler.nl>
Subject: LF: SAQ
Cc: "Cas Caspers" <cas.caspers@hetnet.nl>, 
 "Jaap Kroon, PA0IF" <jaapkroon@wxs.nl>,
 "Jan Harte" <jan.harte@hetnet.nl>, 
 "Jan Hekkert, PA3HCD" <jhekkert@ichthus.lifenet.nl>,
 "Koos Fockens, PA0KDF" <K.Fockens@iaf.nl>
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<font size=3><b>To All from PA0SE<br><br>
Today I had good reception of SAQ on 17.2kHz. I used a Wandel &amp;
Goltermann SLM type SPM-12 connected to the aerial system for 136kHz with
26nF extra in parallel with the loading coil.<br><br>
Replacing the aerial by a one-turn untuned square loop of 1 x 1 m the
signal was sufficiently over the noise to be measured at 0.174 microvolt
(25Hz I.F. bandwidth).<br><br>
 From this follows a field strength of about 482 microvolt/metre
(53.7dBľV).<br><br>
This makes it possible to do some speculation as to the power radiated by
SAQ (Effective Monopole Radiated Power, EMRP). <br><br>
The coordinates of SAQ are given as 57.07N, 12.24E. Using a computer
program written by Harry, PA0LQ, I find as QTH locator JO67CB. My own
locator is JO22GD. Again using Harry's program yields a distance of
735km.<br><br>
We can now enter these data into the graphs of CCIR Recommendation 368-7
for ground-wave propagation. This results in:<br><br>
<u>Type of ground</u>&nbsp; <u>dielectric constant </u>&nbsp;&nbsp;
<u>conductivity (mS/m)</u>&nbsp; <u>EMRP<br><br>
</u>Perfect ground&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
1.4kW<br><br>
Land&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
40&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
30&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
3.0kW<br><br>
Land&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
22&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
3&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
3.7kW<br><br>
Medium
dry&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
15&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
4.7kW<br>
ground<br><br>
Dry
ground&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
7&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
0.3&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
5.9kW<br>
ground<br><br>
If we estimate from these data an EMRP of 4kW then with an alternator
output of 200kW the efficiency of the aerial system is (4/200) * 100% =
2%.<br><br>
For an aerial at such a low frequency that seems not too bad.<br><br>
It could well be that the aerial system was designed to give some
directivity towards the USA.<br>
In that case the power must be higher than assumed. <br><br>
Well, take it for what it is worth!<br><br>
It would be nice if someone nearer to Grimeton would measure the field
strength outside the near field area, for instance&nbsp; at 5 wavelength
distance, or 87km. <br>
At that distance at 17.2km perfect ground can be assumed for calculating
the EMRP (1kw produces 300mV/m at 1km distance, decreasing in a linear
way with distance).&nbsp; <br><br>
I also managed to work SA6Q in the 136kHz band. Sent RST459, received
RST429.<br><br>
I have made a WAV recording of SAQ of 1 minute duration and have sent it
to SAQ. It is much too to&nbsp; pass the reflector.<br><br>
73, Dick, PA0SE </font></b></html>