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RE: 21MHz satellite interference from planet Jupiter ???

Hi William

For some years now, I have been listening and recording 20 MHz non-thermic
noise coming from Jupiter.
L bursts and S bursts (L ans S stand for long and short) generated in the
jupiterian magnetosphere are directly linked to the position of a Jupiter
satellite called Io.
The noise bursts appear during predictable periods, and they are a few
minutes to some quarters of hours long.
My amateur "radiotelescope" consists in an array of two pairs of 20 MHz
dipoles and in an ICOM IC-738 transceiver.
The largest bursts (around 100 000 jansky) give about 0.5 microvolts at the
50 ohms input of my receiver, and that's for a short period only and only a
few times on a 12 months period.
So the Jupiter noise shouldn't be a problem for a 21 MHz sat uplink ...

73 de Jean-Louis F6AGR

> ----- Original Message -----
> From: "William Leijenaar" <pe1rah@hotmail.com>
> To: <amsat-bb@AMSAT.Org>
> Sent: Saturday, November 06, 2004 2:28 PM
> Subject: [amsat-bb] 21MHz satellite interference from planet Jupiter ???
> > Hi AMSATs,
> >
> > I am not very known with radio astronomy and I was surfing
> around on some
> of
> > the internet pages.
> > Then I found some information about Jupiter, that the storms on this
> planet
> > can be monitored between 18MHz to 22MHz. This is very interresting for
> radio
> > astronomy but for satellites with 21MHz RX maybe not.
> >
> > As I have not to much experience at all on <50MHz so I like to know if
> > someone (maybe RS users) have more information if this can cause serious
> > problems on a satellite uplink on 21MHz...
> >
> > 73 de PE1RAH
> > William Leijenaar
> > ---
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