Hi Mike
The armonics of the mains are generate out of my shack by electric
appliances like dimmers etc. and i cannot filter, being just on the band.
The 2750th armonic is walking around 137.5 Khz, because of the drift ( some
mHz ) that is usually present in the mains. Fortunately this noise is not
always present, some help is possible using a noise-canceller with an indoor
antenna, in the case that we have only a source of noise. best 73 Cesare
Cesare Tagliabue I 5 TGC
WW-Loc JN53PS
e-mail: [email protected]
url: http://www.dadacasa.com/i5tgc
-----Messaggio originale-----
Da: WE0H <[email protected]>
A: [email protected] <[email protected]>
Data: sabato 27 aprile 2002 21.05
Oggetto: RE: LF: Jason reception
Why not use a 50hz comb filter to eliminate the harmonics of the mains??? I
have a 60hz comb filter kit that I am building to help out in the US.
73's,
Mike>WE0H
http://www.geocities.com/we0h/lf.html
-----Original Message-----
From: [email protected] [mailto:[email protected]]On Behalf
Of cesare tagliabue
Sent: Saturday, April 27, 2002 12:08 PM
To: [email protected]
Subject: R: LF: Jason reception
Hi Jim
Your Jason signals were quite strong and, in the pauses of noise, the
waterfall was completely black and only the lines of signal were clearly
visible, unfortunately the noise, probably due to te 2750 th armonic of the
mains, was walking up and down on the band, from time to time crossing the
frequency and filling the waterfall. The time appearing on screenshot is
our
summer time, UTC+2 hours. 73 Cesare
Cesare Tagliabue I 5 TGC
WW-Loc JN53PS
e-mail: [email protected]
url: http://www.dadacasa.com/i5tgc
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