Ads-b and sailplanes

On Thursday, May 7, 2015 at 7:40:59 AM UTC-7, kirk.stant wrote:
The problem is, in order to see ALL ADS-B traffic, you HAVE to have ADS-B out. So to get reliable info, you have to have, at a minimum, about $1500 for a Skyguard UAT transceiver and and $500 for an iFly display to show the data. Or an iPhone 6+, same price.

Uh no, to see all ADS-B traffic you just need to have receivers for both UAT and 1090ES, both transmit continuously whether or not there is other ADS-B traffic in the area. It is ADS-R from ground stations that may not be transmitted if there are no detected ADS-B out targets in the area.

On Thursday, May 7, 2015 at 12:20:41 PM UTC-5, wrote:

Uh no, to see all ADS-B traffic you just need to have receivers for both UAT and 1090ES, both transmit continuously whether or not there is other ADS-B traffic in the area. It is ADS-R from ground stations that may not be transmitted if there are no detected ADS-B out targets in the area.

Are you sure? As I understand it, unless you transmit ADS-B out, you will not get all the UAT ADS-B out traffic. You will only see them when a UAT ADS-B out is getting traffic info for all the traffic near him. And you have to be in range of a ground station.

Agree that with a 1090ES receiver (such as a PF), you will see all 1090ES traffic nearby - but not UAT-only ADS-B traffic.

Kirk
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On Thursday, May 7, 2015 at 2:14:58 PM UTC-7, kirk.stant wrote:
Are you sure? As I understand it, unless you transmit ADS-B out, you will not get all the UAT ADS-B out traffic. You will only see them when a UAT ADS-B out is getting traffic info for all the traffic near him. And you have to be in range of a ground station.

1090ES and UAT ADS-B out devices continuously transmit position and velocity vector once or twice per second (I'm hazy on which it is). A ground station may suppress transmission of TIS-B and ADS-R, if there is no ADS-B target of the corresponding type in the coverage area.

Marc