Hi Markus ,
Good luck to track unpleasant the small arc which makes you miseries!
..... And if Murphy is in the party aie aie !......
73 and HNY for 2009 , Jean-Pierre f1afj
Markus Vester a écrit :
Hi Jean-Pierre,
thanks for the report! I was trying to locate an intermittent fault in
the antenna system. Most times, I can go up to my full 200 W, giving
3.5 A (16 kV rms) without problems. But sporadically already above a
threshold of 1 A (4.5 kV rms), some sort of partial discharge starts
to happen, resulting in increased and erratically variable resistance
and also slightly increased capacitance. It is accompanied by strong
noise emissions in the FM broadcast band (which had been hardly
noticable during several former instances of visible corona). With a
piece of wire as a capacitive probe on a scope, a distinct and fast
"ringing" is present on each rising edge of the carrier sinusoid. I
have tried to look for visual corona in the dark and listen for the
telltale sharp hiss of voltage breakdown, but with no definite
findings up to now. At the moment all seems ok - Murphy's playing hide
and seek...
Best wishes for 2009,
de Markus, DF6NM
----- Original Message ----- From: ""Jean-Pierre Méré (F1AFJ)""
<[email protected]>
To: <[email protected]>
Sent: Thursday, January 01, 2009 7:36 PM
Subject: LF: 137.750 qrss3
Hello Markus (NM)
Good copy of your signal test now !
73 HNY Jean-Pierre f1afj
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