LF observations 9 JAN 2000 (136..137 kHz) by OH2LX
(qth: Jokela, South Finland, KP20LN, (60N34 024E58)
(AR7030Plus/---- 10m coax---/1:10/---15m wire----):
2105z 136.5 G3YXM clg CQ (319)
2112z 136.5 IK5ZPV clg CQ (319)
- clg CQ again 2118, 2122, 2124 UTC
2135z OH3LYG (439) clg IK5ZPV, no qso
2138z 136.6 IK5ZPV clg CQ (319); 2242z again...
2206z 136.5 G3YXM clg CQ (319)
- clg CQ again 2208, 2211, 2217 UTC
2218z OH3LYG answering & working G3YXM
IK5ZPV & G3YXM: same strength for these 1½ hours.
2200z 137.0 CHI signs on, S-estimate: -120 dBmW
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Below measuring results of 10 JAN 2000, 0510 UTC -
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(R&S ESH2/---- 10m coax---/1:10/---15m wire-----):
Noise level with antenna: with 200Hz IF BandWidth:
-24..-22 dB(uV), -131..-129dBmW (varies w ICM etc)
Noise level with antenna: with 500Hz IF BandWidth:
-18..-16 dB(uV), -125..-123dBmW (varies w ICM etc)
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128.9 DCF49 +23 dB(uV) -84 dBmW
135.7 Greek +4 -103
137.0 CHI -18 -125
138.8 DCF39 +32 -75
141.4 ? +5 -102
146.8 ? +1 -106
131.8 Datatrak +3 -103
133.2 Datatrak -3 -110
144.6 Datatrak +3 -103
146.5 Datatrak -4 -111
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AUDIO NOTES: Big difference in audios of my two
receivers. In AR7030Plus signals come from "empty
space" with practically no background noise..
R&S ESH2 being a Measuring receiver with no AGC etc
sounds as if waterdrops were falling on ice...
(Most of you no doubt understand this difference).
I must be lucky to have only slight amount of QRM
w ICM (fm 138.83) and Russian Chayka on background.
Note: This is after de-activating ISDN installation.
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ICM (Ionospheric Cross-Modulation)-Could you please
check which stations you possibly can identify on
DCF39 138.83 carrier, especially on Lower SideBand.
After aurally monitoring ICM for decades I only now
have noticed some funny effects with some ICM audio
bursts "leaking" down to at least 136.0 kHz (that is
3 kHz down from carrier), this with 500 Hz cw filter
while sometimes listening and standing by for hours.
As you know ICM effectively filters higher audios.
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73 and Happy 2000 to all de Vaino, OH2LX
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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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