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**IZ8292SWL** · 2024-07-28, 17:13

Originally posted by abcd567 View Post

(1) Flightaware sells their hardware from their store, but delivery is only within USA. However it is available in Europe from PiHut. Please see link below

(2) Slthough Flightaware blue stick has a builtin 1090 filter, in case of strong interference this may not be sufficient and you may need to install an external filter. Please see PiHut link below.

FlightAware 1090 MHz ADS-B Bandpass SMA Filter

https://thepihut.com/products/flightaware-1090-mhz-ads-b-bandpass-sma-filter

SMA (female to male) 1090MHz Mode S filter. Designed to reduce interference and significantly improve valid mesage rate of ADS-B/Mode S receivers. This is the new 2019 version which features a narrower pass band frequency range of 1080MHz - 1100MHz.Impedance is 50ohms and insertion loss is <2.5dB.Features 1090MHZ AD

https://thepihut.com/products/flight...ads-b-receiver

I bought the stick in 2019 from Amazon USA and i live in Europe.
It was way cheaper back then!

So an additional filter is needed in my case due to strong FM and other signals.

Thanks!

**abcd567** · 2024-07-28, 19:42

(1) There are two versions of Flightaware filter

(a) For Europe, Dark Blue, 1090 MHz only
(b) For North America, Light Blue, 1090 + 978 MHz

Pi Hut has only European version (1090 Mhz only, Dark Blue), and that is what you need as it has narrower bandwidth.

(2) Before you proceed to purchse the filter, run following test.
Please note the test options 1 to 3 do not cover FM band, these covers only Cell/Mobile band from 800MHz to 1200MHz:
To cover FM band also use option-4 which checks from 24MHz to 1800 MHz and is pretty fast

Do I need a Filter? - Find RF Signals In Area - Flightradar24 Forum

https://forum.flightradar24.com/forum/radar-forums/technical-matters-hardware/11130-do-i-need-a-filter-find-rf-signals-in-area

The space around ADS-B antenna contain not only 1090 MHz signals, but also lot of other signals at different frequencies. The closer the frequency of a signal to 1090 MHz, your ADS-B antenna picks it stronger. For example if there are three signals of equal strength, one at 144 MHz, 2nd at 850 MHz and 3rd at 950 MHz, the ADS-B

**IZ8292SWL** · 2024-07-28, 20:35

Originally posted by abcd567 View Post

(1) There are two versions of Flightaware filter

(a) For Europe, Dark Blue, 1090 MHz only
(b) For North America, Light Blue, 1090 + 978 MHz

Pi Hut has only European version (1090 Mhz only, Dark Blue), and that is what you need as it has narrower bandwidth.

(2) Before you proceed to purchse the filter, run following test.
Please note the test options 1 to 3 do not cover FM band, these covers only Cell/Mobile band from 800MHz to 1200MHz:
To cover FM band also use option-4 which checks from 24MHz to 1800 MHz and is pretty fast

Do I need a Filter? - Find RF Signals In Area - Flightradar24 Forum

https://forum.flightradar24.com/forum/radar-forums/technical-matters-hardware/11130-do-i-need-a-filter-find-rf-signals-in-area

The space around ADS-B antenna contain not only 1090 MHz signals, but also lot of other signals at different frequencies. The closer the frequency of a signal to 1090 MHz, your ADS-B antenna picks it stronger. For example if there are three signals of equal strength, one at 144 MHz, 2nd at 850 MHz and 3rd at 950 MHz, the ADS-B

I remember doing this test and i have quite a strong GSM signal near the station.
Take a look!

miniantenna.png

**abcd567** · 2024-07-28, 23:02

Yes, you do have strong RF interference. An external filter like Flightaware 1090 Mhz linked in my above post will reduce RF noise.

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