[ACARS] Multiple Scanners

Fri, 8 Feb 2002 09:19:10 +0200

Hello Robin,
and now you made me nervous...=20
When I bought my splitter I asked about the impedance of it and was told =
it is 50 Ohm (though I may have asked "is this for 50 Ohm system because =
I need one...?").=20
I had never even thought about the F connectors being 75 ohm by default. =
I guess I could check them more carefully to find out the truth.=20
Still I am sticking to my words that the application of the splitter has =
worked surprisingly well in my installation, even more so considering =
its cost. Signal does get weakened, but not too much to bother. The =
impedance mismatch causes some additional loss but I am almost arguing =
that it as well is insignificant (though all these insignificants starts =
adding up now...)

With Regards,
Sami
OH6MLW (I hope I wont lose my license because of this ignorance)

> -----Original Message-----
> From: ext Robin Schreuder [mailto:[email protected]]
> Sent: 07 February, 2002 20:02
> To: [email protected]
> Subject: Re: [ACARS] Multiple Scanners
>=20
>=20
> Sorry Sami.
>=20
> But if you got a splitter with F type connectors you can be=20
> shure you got a 75 ohms device.
> F type conn. have a typical impedance of 75 ohms.
>=20
> You have to look for splitters with 50 ohm BNC or N type.
> (also these type of connector are available in 75 ohms, so if=20
> there's no reference on the
> splitter itself to what the load is you can try to find it on=20
> the connectors. (in small print))
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> Robin..
>=20
> [email protected] wrote:
>=20
> > Hello Colin,
> > all you need is a cheap antenna splitter, preferably a=20
> matched one so that there is 50 Ohm in each port of the=20
> splitter. I have used it successfully with ACARS. As long as=20
> you do not scan but only use one frequency (as you do) you=20
> should not get any interference from the two scanners.=20
> Sometimes it happens that when you scan the local=20
> oscillator(s) of one scanner is heard from the other scanner.
> > The splitter can be bought e.g., from the store that sells=20
> satellite TV "stuff", it should not cost more than some=20
> =A34.00. As the signal is split, you will loose some 3+ dB=20
> unless there is amplification in the splitter. With a=20
> non-matched one you will loose more.
> > Very often the connectors are F-type, so you may need to=20
> have three adaptors to make it BNC compatible. Inthe end=20
> these adaptors cost more than the splitter...
> >
> > With regards,
> > Sami
> > OH6MLW
> >
> > > -----Original Message-----
> > > From: ext [email protected] [mailto:[email protected]]
> > > Sent: 07 February, 2002 0:05
> > > To: [email protected]
> > > Subject: [ACARS] Multiple Scanners
> > >
> > >
> > > Hi!
> > >
> > > I am currently using the acars primary channel (131.725) only
> > > to decode acars
> > > as when I use my scanner (mvt-7100) to scan more than one
> > > channel I lose
> > > about 50% of messages available (from approx. 1000=20
> messages a day to
> > > sometimes as low as 400 messages a day).  I now have a second
> > > scanner (icom
> > > pcr-1000) and want to use both scanners on different channels.
> > >
> > > Can someone tell me what extra equipment I need to decode two
> > > channels at the
> > > same time?
> > >
> > > Thank you in advance.
> > >
> > > Colin Acton.
> > > Wrexham, North Wales, UK.
> > >
> > >
> > > --- StripMime Report -- processed MIME parts ---
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> > >   text/html
> > > ---
> > > _____________________________________________
> > > Acars info and Aircraft ID answers at  http://www.acarslink.com
> > > like to join the ACARS Web Ring go to http://www.acarsonline.co.uk
> > > [email protected]
> > > http://mailman.qth.net/mailman/listinfo/acars
> > >
> > _____________________________________________
> > Acars info and Aircraft ID answers at  http://www.acarslink.com
> > like to join the ACARS Web Ring go to http://www.acarsonline.co.uk
> > [email protected]
> > http://mailman.qth.net/mailman/listinfo/acars
>=20
> _____________________________________________
> Acars info and Aircraft ID answers at  http://www.acarslink.com
> like to join the ACARS Web Ring go to http://www.acarsonline.co.uk =20
> [email protected]
> http://mailman.qth.net/mailman/listinfo/acars
>=20