Author Topic: AIS antenna  (Read 30270 times)

Peter

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AIS antenna
« on: 15 September, 2010, 12:08:56 pm »
What antenna are you using? Commercial or homemade?

yarmouthshipping

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Re: AIS antenna
« Reply #1 on: 15 September, 2010, 03:36:15 pm »
I have a V-Tronix AIS Masthead Antenna which is mounted 20 meters ASL unlike some non-dedicated AIS Antennas this does filter out nearby bleed over i have a discone at 30 Meters which is affected by Local Coastguard Signals. I will be getting the V-Tronix up to that height soon expecting good reception.

smokie

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Re: AIS antenna
« Reply #2 on: 15 September, 2010, 04:32:09 pm »
Running a  Metz Manta-6 VHF Antenna to a comar SLR200N, approx asl 35m, would like something better if possible to extend the receiving range.
phil
http://www.newquayweather.com/
Weather station WS2300, AIS - Comar SLR200N, Metz Manta-6 VHF Antenna

wadscan

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Re: AIS antenna
« Reply #3 on: 16 September, 2010, 08:46:20 pm »
[ quote author = Smokie link = topic = 4.msg15 # msg15 date = 1284557529 ]
Het runnen van een Metz Manta -6 VHF antenne op een Comar SLR200N , ca. boven de zeespiegel 35m , wil graag iets beters indien mogelijk aan het ontvangst bereik uit te breiden.
phil
[/ quote]
hi
i use a cx4 ship anthena
works good
i had a longer version buth that works not better
20 mrt above see level
greatings Johan

FSD

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Re: AIS antenna
« Reply #4 on: 18 September, 2010, 05:24:19 pm »
We use diferent antennas at different sites.

- At site-1 we use now a Diamond-3000 HAM radio antenna at 16m asl. A special dedicated +6db marine antenna works bad. The receiption with the Diamond appears to be exellent ( RX = True heading CTRX transponder).

- At site-2 we use a CX-4 marine VHF antenna (= 1/2 wave dipole) at 10meter asl with a SR-161 receiver.

- At site-3 we use a Wicker-Bürki AG, Wipic 2-element 180 degree, + 3dB antenna at 35 meter asl. with a SR-161 and VHF antenna splitter.

- At site-4 we use a Wicker-Bürki AG, Wipic 2 element 180 degree, +3dB antenna at 16meter asl with SR-161 and VHF antenna splitter.

All antennas are connected with ECOflex-10 coaxial cable.
« Last Edit: 30 January, 2012, 03:44:05 am by FSD »

Sheffield Pirate

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Re: AIS antenna
« Reply #5 on: 04 October, 2010, 07:46:38 pm »
I use two home-made 5-element collinear AIS antennas, built to the design published by Neal Arundale.  The antennas are separated by about 7m and they feed through a T-connector to a Comar AIS-2-USB receiver.  I receive about 50% more messages using the paired antennas compared to a single antenna.
I have also tested a 6-element log-periodic AIS antenna from DPD Productions, it has a nominal gain of +9db but at my location it performs no better than the collinears.
Details of the antennas:
http://web.arundale.co.uk/docs/ais/aerial.html
http://www.dpdproductions.com/page_marine.html#aislp

Leeus

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Re: AIS antenna
« Reply #6 on: 18 October, 2010, 08:43:01 am »
What do you use to join your "paired" antennas?

Sheffield Pirate

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Re: AIS antenna
« Reply #7 on: 19 October, 2010, 08:39:34 pm »
I simply feed the coaxial cables from each antenna into a BNC 'T' adaptor, like this one
http://www.maplin.co.uk/Module.aspx?ModuleNo=1582
then connect the adaptor to the AIS receiver
in theory the cables should be phased-matched, so I experimented a bit with the lengths of
the antenna feed cables


hudsonh

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Re: AIS antenna
« Reply #8 on: 09 January, 2011, 04:05:17 pm »
standard 8db gain antenna

sycophantic

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Re: AIS antenna
« Reply #9 on: 15 March, 2011, 09:43:14 pm »
I am using a homemade dipole antenna (centered at 162 MHz) built from a 4 position terminal block, two pieces of coat hanger and RG-58 wire.

TRV-FR

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Re: AIS antenna
« Reply #10 on: 09 August, 2011, 01:07:20 am »
Hello,
I built my own Yaggi antenna. I used the work of HB9CV, http://www.changpuak.ch/electronics/HB9CV.php to detemine the length. Seem to work fine as I recorded a boat 99nm away.
Regards, Jacques

TRV-FR

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Re: AIS antenna
« Reply #11 on: 19 October, 2011, 09:53:07 pm »
Hi all,
how can you evaluate the efficiency of the antenna ? What measurement can you do when you have only a receiving station ? Measurements depends on the emmiters which are obviously mobile and not necessarily present.
Any halp appreacited, Jacques

Mad sientist

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Re: AIS antenna
« Reply #12 on: 05 January, 2016, 01:27:19 am »
I'm using three homebrew LFA yagy's peeked to center freq 162Mhz with EZNEC and a horizontal opening of 120 degr at +4dB at the edge and +9dB at the centerline. The antenna's are on 120 degr offset so three yagy's give 360 degr coverage. Combined with 3 AIS dual channel receivers gives the best chance on picking up condition RX.

patrick@pbryant.com

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Re: AIS antenna
« Reply #13 on: 04 February, 2016, 06:20:39 pm »
I'm using a Digital Antenna model 578-SW mounted 12 meters above sea level atop mainsail mast. No ground plane/couterpoise required.