Receiving UTAs on 978 Mhz

Oliver Jowett oliver.jowett at gmail.com
Mon Jul 22 03:20:05 UTC 2019


UAT uses different modulation / preamble / message length and framing etc.
A Mode S demodulator on a different frequency is not going to work; you
need a demodulator specifically for UAT.

The underlying modulation is BFSK so you could maybe use a generic BFSK
demodulator (or even rtl_fm) and build on top of that, but you do only have
~2 samples per bit to play with on a 2832 so YMMV.

Oliver


On Sun, 21 Jul 2019 at 19:49, Yaron Haddi <yaron at rontalcolour.ca> wrote:

> Hi Oliver,
>
> I know that the frequency is different and that messages have other
> structures. I have created my own message parser, so I was hopping that all
> is needed is just changing the frequency in the rtl_adsb program or,
> alternately, the ability to specify the desired frequency in the command
> line.
>
> Yaron
>
> On 20/07/2019 06:10, Oliver Jowett wrote:
>
> On Fri, 19 Jul 2019 at 15:58, Yaron Haddi <yaron at rontalcolour.ca> wrote:
>
> Is it possible to adapt rtl_adsb to receive UTAs on 978 MHz as well? I
>> wish something like this was included in the library as a binary for
>> Windows.
>>
>
> UAT is an entirely different protocol with different modulation and
> message formats; it does not have much in common with 1090MHz ADS-B.
>
> You might want to look at dump978: https://github.com/flightaware/dump978 (though
> there's no Windows build)
>
> Oliver
>
>
>
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