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Date: Mon, 15 May 2006 14:11:34 +0200
To: rsgb_lf_group@blacksheep.org
From: Dick Rollema <dickrollema@casema.nl>
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Subject: Re: LF: DCF39 ERP and field strength
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Dear Jose,

You wrote:
>
>In the web of Geri, DK8KW, can be seen that DCF39 ERP is 40KW (22KW EMRP),=
=20
>based on measurements made by Geri some years ago. For this radiater power=
=20
>corresponds, at 1800 Km, in function of inverse of distance, 58 dB(uV/m);=
=20
>last nigth I made measurement of 60 dB(uV/m), so I wonder if still DCF39=B4=
s=20
>power is the same as before, and if the previous theorical field strength,=
=20
>with no reflection loss, can be exceeded some times due to the several=20
>propagation factors involved.

I measure the field strength of DCF39 at 2078 microvolt/metre (66.35 dB=B5V)=
=20
, as it is always  at daytime.

The distance between my  location and DCF39 is about 500 km. Using the=20
graph for "LAND" (conductivity 0.03 S/m, dielectric constant 40)  in CCIR=20
Recommandation 368-7: GROUND-WAVE PROPAGATION CURVES FOR FREQUENCIES=20
BETWEEN 10 KHz AND MHz I find the power of DCF39 to be 39.8 kW.  This=20
should be rounded to 40 kW of course.  That this agrees so well with the 40=
=20
kW mentioned by  Geri is pure coincidence, given the uncertainties =
 involved.

73, Dick, PA0SE
JN22GD=20
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<body>
<font size=3D3>Dear Jose,<br><br>
You wrote:<br>
<blockquote type=3Dcite class=3Dcite cite=3D"">&nbsp;<br>
</font><font face=3D"arial" size=3D2>In the web of Geri, DK8KW, can be seen
that DCF39 ERP is 40KW (22KW EMRP), based on measurements made by Geri
some years ago. For this radiater power corresponds, at 1800 Km, in
function of inverse of distance, 58 dB(uV/m); last nigth I made
measurement of 60 dB(uV/m), so I wonder if still DCF39=B4s power is the
same as before, and if the previous theorical field strength, with no
reflection loss, can be exceeded some times due to the several
propagation factors involved.</font></blockquote><br>
I measure the field strength of DCF39 at 2078 microvolt/metre (66.35
dB=B5V) , as it is always&nbsp; at daytime.<br><br>
The distance between my&nbsp; location and DCF39 is about 500 km. Using
the graph for &quot;LAND&quot; (conductivity 0.03 S/m, dielectric
constant 40)&nbsp; in CCIR Recommandation 368-7: <i>GROUND-WAVE
PROPAGATION CURVES FOR FREQUENCIES BETWEEN 10 KHz AND MHz</i> I find the
power of DCF39 to be 39.8 kW.&nbsp; This should be rounded to 40 kW of
course.&nbsp; That this agrees so well with the 40 kW mentioned by&nbsp;
Geri is pure coincidence, given the uncertainties
<font face=3D"TIMES" size=3D3> </font>involved.<br><br>
73, Dick, PA0SE<br>
JN22GD</body>
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