ADS-B "Out" Confusion/Questions

[ArtVandelay]

Another question: Once you are ADS-B out equipped, will you still need to squawk an assigned code? Doesn't your equipment send a unique code that allows ATC to identify who you are at all times?

No, not exactly, with the transponder solution this is true, your tail number will be part of the transmission, the 978 (Gdl88) can operate anonymous mode and they will not know who you are (only when paired with a mode C transponder) , mode S transponder must have tail number included because identification is already transmitted as part of the S type transmission and they would get 2 different replies, as already mentioned, ATC doesn't see this detail, the ATC computers do.

[NotarPilot]

ATC doesn't see this detail, the ATC computers do.

Well that makes total sense.

[Piloto]

The assigned squawk code confirms the controller you are contact with them. If you are squawking 1200 you are not in contact with them.

 

Mode A/C format will still be part on the new ADS-B transponders. Mode A/C format allows for greater range than ADS-B. This is due to the use of 20dB gain directional antennas for Mode A/C (sync azimuth alignment) that can not be used with ADS-B (omnidirectional 3 dB antenna). Also a hacker can emulate multiple ADS-B traffic with a single ADS-B transponder while it is very difficult with mode A/C.

 

José

[rbridges]

I was flying over Atlanta yesterday and spoke with ATC.  I asked if he saw anything different with the new transponder.  He said "wait a second, let me switch screens."  He then said he could see my transponder broadcasting ADS-B out.  His words were "pretty cool."  Anyway, my point is that they don't see any difference b/t you and the next guy on an instrument flight plan/flight following.  

[rbridges]

here's a few pics from my foreflight.  Note the traffic jam at KATL.  Don't look at my ground speed.  I had a 20 knot headwind.  

 

[GeorgePerry]

This course from AOPA and the Air Safety Institute does a pretty good job of explaining the 'ins and outs' (pun intended) of ADS-B along with were you'll need to be ADS-B out compliant in 2020

 

 

[ArtVandelay]

here's a few pics from my foreflight. Note the traffic jam at KATL. Don't look at my ground speed. I had a 20 knot headwind.

I assume brown means the plane is on the ground?

[carusoam]

Could be Alt unknown since the TXPs are not in Alt mode while at the gates...

-a-

[ArtVandelay]

Could be Alt unknown since the TXPs are not in Alt mode while at the gates...

-a-

I thought all the big airports required them to be on for tracking on the ground?

Sent from my iPhone using Tapatalk

[gacoon]

Brown on the ground

[Ftlausa]

The problem with the switch to having the transponder on when on the ground is that when you take off your TIS goes nuts.  Was flying at FXE yesterday and as soon as I took off I started getting a half dozen traffic alerts for all the aircraft taxing on the ground.  We pulled the breaker because I couldn't hear the controller over all the traffic alerts.  That, of course, defeats the purpose of having the TIS in the first place.  

[kevinw]

Did he get into specifics with the kt74? I've only has mine a short while so no real chance to test it.

Not really. Just said the ones he installed keep coming back and the 330ES is problem free. I was out on the 330 until Garmin dropped the price $2000. I'm sure they'll keep coming down but I want to get this out of the way.

[thinwing]

the installer was getting units back because he didnt upgrade the kt-74 firmware...his dealer portal for bendix- king is unfortunately kluggish to use...no usp and requires windows vista or older and a 232 output on and older computer...than the ok semiconductor GuI to update firmware doesnt recognize com ports (we had to reboot and manually select the right comport).The Garmin dealer portal much easier to use..also I believe dealers do better selling Garmin vs the Bendi- king...regardless ..after a couple trys my kt-74 /Garmin 530w has been working perfect with a good compliance report from faa.kpc

[Cruiser]

Bob,

 

great screen shots of the traffic and I am glad the ADS-B is working for you......... BUT

 

Why were you NOT on the magenta line???????????

[Piloto]

Mode A Squawk Code requirement:

 

Mode A Code.

 

(1) ATC automation relies on the Mode A code to identify aircraft under radar surveillance and to correlate the displayed target to a flight plan. The Mode A code is one element of the transmitted ADS-B message set. Because SSR and ADS-B surveillance will overlap in much of the NAS, correlation of the Mode A code between the transponder and the ADS-B message is necessary to ensure that a single target is resolved and correlated to a flight plan route. (2) It is imperative that the ATC-assigned transponder code is identical to the one in the ADS-B OUT message. A preferable design configuration is one that provides the pilot a single point of entry for the Mode A code in both the transponder and the ADS-B OUT avionics. If there is no single point of entry provided for the Mode A code into the transponder, then the AFM or operating handbook must address the requirement to enter the Mode A code into both systems separately.

 

NOTE: Transmission of conflicting transponder and ADS-B Mode A codes will result in erroneous traffic conflict alerts within the ATC automation system.

 

From: http://www.faa.gov/documentLibrary/media/Advisory_Circular/AC%2090-114.pdf

 

 

José

[Marauder]

Bob,

great screen shots of the traffic and I am glad the ADS-B is working for you......... BUT

Why were you NOT on the magenta line???????????

All those targets scared him off of it!

[rbridges]

Bob,

 

great screen shots of the traffic and I am glad the ADS-B is working for you......... BUT

 

Why were you NOT on the magenta line???????????

 

for some reason, ATC didn't seem to care where the magenta line was.  

[Piloto]

Bob,

 

great screen shots of the traffic and I am glad the ADS-B is working for you......... BUT

 

Why were you NOT on the magenta line???????????

 

Because there were clouds ahead.