ADS-B advice - iFly GPS for Android

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ADS-B advice

7/1/2015 9:26 PM

Joined: 1/1/0001

Posts: 0

Re: ADS-B advice

That's basically correct. I think 1090 is primarily for aircraft flying above 18,000 feet and 978 for aircraft flying below 18,000 feet if I remember correctly. However, all aircraft fly below 18,000 feet at times, so you want to see them also. A dual frequency receiver would do that whereas a 978 would only see 1090 traffic via a ground station.

7/2/2015 10:43 AM

Shane

Joined: 4/21/2010

Posts: 1709

Re: ADS-B advice

OldPilot is right. There is a catch to the basic rule of 978mHz for GA under FL180 and 1090mHz for above FL180. The FAA approved the 1090ES option and now many Mode S Transponders have been upgraded to ADSB out. Many of those planes will never be above FL180, yet using the 1090ES band for ADS-B Out. So you really have a growing number of aircraft with 1090ES that will never be above FL180.

I personally would lean towards having a dual-band Transceiver to ensure you get the maximum air-air traffic when at low altitudes or at distant areas away from ground stations. Also, your air-air traffic will only increase as we get closer to 2020.

Shane Woodson
Vice President | Adventure Pilot LLC.

7/3/2015 7:56 AM

Cobra

Joined: 4/20/2011

Posts: 2602

Re: ADS-B advice

Yup. I'm one of those who's ended up with a 1090ES ADSB-out solution in a Piper Cherokee, simply because it made sense at the time I was ready to buy. I didn't want a 1090ES, and maybe if I'd waited another three years there'd have been a better option, but I was having the panel overhauled and it made sense to do it all together, and the 1090ES was the only reasonable choice I had.

Because 1090ES has been an option for certificated planes for a few years, and 978UAT options for certificated planes are really only just starting to appear now, there is some number of lower-than-18000' flyers out there who will be squawking on 1090.