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Author Topic: Airnav antenna and AIS (VHF)  (Read 431 times)

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tobydude2

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Airnav antenna and AIS (VHF)
« on: March 02, 2019, 12:27:00 PM »
Hi.
Can the Airnav antenna (1090 MHz antenna) and a AIS (VHF antenna for ship traffic) be mounted on the same pole?




Runway 31

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Re: Airnav antenna and AIS (VHF)
« Reply #1 on: March 02, 2019, 02:05:20 PM »
No reason why not

Alan

tobydude2

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Re: Airnav antenna and AIS (VHF)
« Reply #2 on: March 02, 2019, 02:10:57 PM »
No reason why not
Thanks.
Just wondered as the instruction manual for the AIS antenna say:
"Caution:
• The AIS receiver generates and radiates a small amount of radio frequency electromagnetic
energy, in accordance with CE and FCC regulations while in operation. This equipment must be
installed and operated according to the instructions contained in this manual. Failure to do so can
result in personal injury and / or AIS receiver malfunction.
• The antenna should not be located near or operated in conjunction with any other VHF transmitting equipment. The required antenna impedance is 50Ω.
"

Runway 31

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Re: Airnav antenna and AIS (VHF)
« Reply #3 on: March 02, 2019, 02:19:42 PM »
I am no expert on the matter

However the receivers are receive only so there should be no issue although happy to be corrected by someone with knowledge on the matter and what you detailed mentions transmission equipment.  I would however keep them a reasonable distance apart.

Alan

tobydude2

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Re: Airnav antenna and AIS (VHF)
« Reply #4 on: March 02, 2019, 04:53:20 PM »
I guess the Airnav wave isn´t "any other VHF transmitting equipment."

thanks

Runway 31

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Re: Airnav antenna and AIS (VHF)
« Reply #5 on: March 02, 2019, 04:54:26 PM »
No both antennas are receive only therefore I cannot see any issues

Alan

nikhil

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Re: Airnav antenna and AIS (VHF)
« Reply #6 on: March 07, 2019, 08:46:17 AM »
The best thing to do is have vertical separation. Keep the AIS antenna the highest since you need to see ships as far as possible. The ADS-B antenna can be lower since aircrafts naturally have height.

A 1.5 to 2 meter separation should be good.

tobydude2

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Re: Airnav antenna and AIS (VHF)
« Reply #7 on: March 07, 2019, 03:38:29 PM »
The best thing to do is have vertical separation. Keep the AIS antenna the highest since you need to see ships as far as possible. The ADS-B antenna can be lower since aircrafts naturally have height.

A 1.5 to 2 meter separation should be good.

It got mounted like this. (for now).
It seems to work. Will try a 2 meter separation at a later time. :)
Got the AIS antenna today. :)
Thanks for the tip..



« Last Edit: March 07, 2019, 03:41:23 PM by tobydude2 »

Aerotower

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Re: Airnav antenna and AIS (VHF)
« Reply #8 on: March 08, 2019, 09:25:33 PM »
for the AIS you only need one side (180º) or a 360º view?

wiedehopf

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Re: Airnav antenna and AIS (VHF)
« Reply #9 on: March 08, 2019, 09:46:25 PM »
AIS doesn't matter if it has a small blind spot towards land. (Receiving ship transmissions)

Still mounting it via an offset bracket might improve antenna performance.
Apparently 1/4 wavelength, that's 46cm for AIS, is optimal from what i can gather.

But even a 10cm bracket would probably be an improvement.

On the other hand a bracket and the antenna mounted at an offset will most likely increase wind loading of the mast.
Optics of the mast without an offset bracket are also much easier on the eye :)
« Last Edit: March 08, 2019, 09:48:33 PM by wiedehopf »

tobydude2

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Re: Airnav antenna and AIS (VHF)
« Reply #10 on: March 09, 2019, 01:16:29 PM »
AIS doesn't matter if it has a small blind spot towards land. (Receiving ship transmissions)

Still mounting it via an offset bracket might improve antenna performance.
Apparently 1/4 wavelength, that's 46cm for AIS, is optimal from what i can gather.

But even a 10cm bracket would probably be an improvement.

On the other hand a bracket and the antenna mounted at an offset will most likely increase wind loading of the mast.
Optics of the mast without an offset bracket are also much easier on the eye :)
Thanks.
I Will make som changes and get some distanse to the pole.

tobydude2

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Re: Airnav antenna and AIS (VHF)
« Reply #11 on: March 09, 2019, 02:06:46 PM »
for the AIS you only need one side (180º) or a 360º view?

Hi
I only need 180 degree view.

 

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