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1090 Antenna for Onbord use?

Posted: Tue Oct 15, 2019 1:57 pm
by Username
Hi
Can someone recommend a "stealth" Antenna for on On board use?
Does anyone got one of this:
https://de.aliexpress.com/item/32661707 ... b201603_55

https://de.aliexpress.com/item/1090-MHz ... b201603_55

https://de.aliexpress.com/item/5-dbi-SM ... b201603_55

are the real one or fake one?

Re: 1090 Antenna for Onbord use?

Posted: Tue Oct 15, 2019 6:42 pm
by snn47
Fake, you will receive but not have the advertised gain.

Gain depends on the antenna design but there are no miracles and gain requires certain physical dimsions.

The first antenna is supposed to have "10 dBi" while the second antenna is supposed to have "7 dBi", but both have the same physical length of 375 mm.

If you compare 375 mm to comercial antennaes from Kathrein, why are they so much longer to achieve similar gain?

9 ±0.5 dBi antenna for ~960 - 1215 MHz with ~1.95 m length see page 58 https://www.kathreinusa.com/wp-content/ ... e_2017.pdf
and
11 ±0.5 dBi antenna for 1030 and 1090 MHz with 2.7 m length
for a comercial antenna from Kathrein for the band with with meassured see page 63 https://www.kathreinusa.com/wp-content/ ... e_2017.pdf

Re: 1090 Antenna for Onbord use?

Posted: Tue Oct 15, 2019 7:02 pm
by Username
I want see how the flight attendant react when you show them a 2m Antenna on board the Plane....