Due to some editorial errors I'll resend this
report as a corrected version. It was thought
justified to include measured values also as
best estimate for "Indicated Field strength".
The use of receiver input level in relative units
"dBmW" in earlier reports is based on following:
1. R&S ESH2 is a genuine Measuring receiver with
50 ohm input. I understand it is the quality that
costs, its original price was abt 25 kilobucks.
2 calibrated loops (HFH2-Z2) + 1 rod (HFH2-Z1)
are available for measurements and calibrations.
2. Due to ITU and EBU requirements we are engaged
to use relative unit dB(mW), after some problems
with our customers we have adopted "dBmW" instead
of normal "dBm". In fact ITU regularly uses "dBW".
Is the use of "dBu" based on some agreements?
de Vaino, OH2LX
-----------------------------------------------------
Special Report, G3WSC Puckeridge ¤ 15-16 April 2000
---------------- 16 April 2000 ----------------------
UTC-/Rx-dBmW/--Indicated Field strength dB(uV/m)---->
-----<-G3WSC bcn-->---128.2---128.9---135.8---138.8--
0425 -128 -> -1 -4 +20 +3 +38
0445 -129 -> -2 -4 +11 +2 +38
0455 -128 -> -1 -3 +17 +2 +38
0500 -128 -> -1 -3 +20 +1 +38
0510 -128 -> -1 -3 +25 +1 +39
0520 -127 -> -0 -3 +29 +4 +40
0530 -127 -> +0 -4 +32 +5 +41
0540 -127 -> -0 -5 +32 +6 +41
0550 -127 -> -0 -5 +33 +7 +40
-----------------------------------------------------
G3WSC beacon closed at 0552 UTC, frequency 137.7 kHz
---------------- 15 April 2000 ----------------------
UTC-/Rx-dBmW/--Indicated Field strength dB(uV/m)---->
-----<---G3WSC---->---128.2---128.9---135.8---138.8--
1945 -116 -> +11 +10 +47 +16 +49
2005 -112 -> +15 +3 +47 +17 +49
-----------------------------------------------------
G3WSC was tuning (?), The Field strength given for it
is a rough average, the frequency was 137.1+ kHz.
Monitoring continued until 2400 UTC, G3WSC not heard.
-----------------------------------------------------
Distance Puckeridge - OH2LX = 1810 km, Azi 249 deg
128.2- = Irish Decca "Green" 2060 km, Azi 267 deg
128.83 = DCF49 Mainflingen 1544 km, Azi 228 deg
135.7+ = SXV Marathon, Greece 2490 km, Azi 182 deg
138.83 = DBF39 Burg 1221 km, Azi 226 deg
-----------------------------------------------------
(R&S ESH2/---- 10m coax---/1:10/---15m wire-----):
Noise level with antenna: with 200Hz IF BandWidth:
-25..-21 dB(uV), -132..-128dBmW (varies w qrm etc)
-----------------------------------------------------
End of message of 16 April 2000, 0825 UTC, from OH2LX
----------------------------------------------------------
V.K.Lehtoranta, OH2LX, POBox 50, FIN-05401 Jokela, Finland
------ Tel: +358-9-4173965 ---- Fax: +358-9-4173961 ------
E-mail: [email protected] - alias: [email protected] & [email protected]
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