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LF: Listening report 24 Nov 1999

To: [email protected]
Subject: LF: Listening report 24 Nov 1999
From: Väinö Lehtoranta <[email protected]>
Date: Mon, 10 Jan 2000 10:30:46 +0200
Cc: [email protected]
Reply-to: [email protected]
Sender: <[email protected]>
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

--------------------------------------------------
Below measuring results of 10 JAN 2000, 0510 UTC - --------------------------------------------------
(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)
--------------------------------------------------
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
--------------------------------------------------

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.
---------------------------------------------------

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.
----------------------------------------------------
73 and Happy 2000 to all          de Vaino, 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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