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01-21-2013, 09:16 AM
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Join Date: Jul 2008
Location: Plymouth, MA
Posts: 133
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Not getting TIS from GTX 330 after GDL 39 Install
Prior to installing the GDL 39 I was receiving traffic on my 796 thru my GTX 330, which has the ES upgrade. I recently installed the GDL 39, hard wiring it to power. It connects thru Bluetooth to my 796. Flew today for the first time w/the new system. I get the ADS-B traffic fine but am not getting TIS traffic. I did not change anything on the GTX 330. Do I need to revise some settings info? or look elsewhere for the problem? Thanks...
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01-21-2013, 09:25 AM
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Join Date: Mar 2006
Location: Newport, TN
Posts: 7,496
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From the manual:
4.3 TRAFFIC
TRAFFIC SOURCE
The aera 795/796 is compatible with two different traffic sources; TIS-A traffic via
a Garmin Mode S Transponder (GTX 330), or ADS-B/TIS-B traffic via a GDL 39. When
the aera 795/796 is configured with both a Mode S transponder capable of receiving
TIS-A traffic and a GDL 39 capable of receiving ADS-B/TIS-B traffic the aera 795/796
will automatically switch between traffic sources. The following conditions describe
the traffic display logic.
• If the GTX is not receiving TIS-A traffic data, GDL 39 ADS-B traffic will be displayed.
• If the GDL 39 is receiving both air-to-air ADS-B traffic data and ground uplink
TIS-B traffic, then the GDL 39 ADS-B traffic will be displayed.
• If the GTX is receiving TIS-A traffic, and the GDL 39 is not receiving ground uplink
TIS-B traffic, then GTX TIS-A traffic will be displayed.
If more than one traffic source is configured, the current traffic source is annunciated
in the upper left corner of the Traffic Page.
If your GDL39 is getting the ground station based TIS-B traffic and air to air traffic, it will win over the TIS-A traffic. Most will agree that TIS-B is superior to TIS-A.....
Last edited by Brantel : 01-21-2013 at 09:29 AM.
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01-21-2013, 10:47 AM
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Join Date: Jul 2008
Location: Plymouth, MA
Posts: 133
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Brian, thanks for the info...wish I understoood all this better. What I was not receiving this morning was TIS-B traffic...so it sounds like the GTX 330 is not the issue?? The flight was in the Boston area so I am assuming that ADS-B coverage was not an issue....or could it be that there was simply no TIS-B traffic??? and that's why there was an X through that box indicating none?? The GDL 39 does connect instantly to my 796 so I'm not sure what is going on.
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01-21-2013, 12:36 PM
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Join Date: Mar 2006
Location: Newport, TN
Posts: 7,496
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If it was TIS-B (ADS-B Ground Station) traffic you were not receiving but you were within range of a ground station, I would question where or not your 330ES has been properly configured and that it has been fed a position source as required to fill out the ES data set.
Did you recently upgrade the unit to ES?
Do you have it hooked up to a GPS and if so, what GPS and how is it connected?
Did you configure the xponder's settings as required for the ES to work properly?
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01-21-2013, 01:33 PM
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Join Date: Dec 2010
Location: Hilton Head Island
Posts: 1,089
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Great thread!
I fly in and around the NYC class B and never see TIS-B. saw it once down around Philly, but busy places don't mean anyone is out there with ADSb OUT.
I just sent out my 330 for the ES upgrade and my dealer told me exactly what Brian said, he just needs to config a couple things once the box comes back to garmin then I am in business sending OUT the OUT signals.
I will not have any GPS feed into the OUT though...but I have a few years to close that requirement out.
I just want to get more traffic displayed as much of the time as possible!
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John Mastro
RV-8
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01-21-2013, 03:07 PM
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Join Date: Jan 2005
Location: Charlotte, NC
Posts: 1,523
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Not having GPS hooked into your ES transponder will render it useless for the that purpose..
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Radomir
RV-7A sold
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01-21-2013, 03:36 PM
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Join Date: Jul 2008
Location: Plymouth, MA
Posts: 133
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The GTX330 is connected thru a serial port to my 796. I assume this is the only GPS connection required?
Prior to getting the GDL 39 I was receiving traffic on my 796 thru the GTX 330.
I had the ES upgrade done thru my local avionics shop/garmin. I was told it was properly configured when I got it back.
Last edited by Bushcaddy : 01-21-2013 at 03:39 PM.
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01-21-2013, 03:59 PM
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Join Date: Jan 2005
Location: Charlotte, NC
Posts: 1,523
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Depends  You will get TIS-B only if you "wake up" the ground based transceiver (GBT). You need ADS-B OUT for that. 330ES can serve that purpose ONLY if it's sending out your current position, which it obtains from a GPS. It depends how your 796 is wired into the 330.. if it's only one direction (from 330 to 796) then this won't work.
Note that 796 being position source for the 330 is not 2020-compliant...you should be able to get away with it, though, until they start ignoring that signal... who knows when that'll be.
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Radomir
RV-7A sold
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01-21-2013, 04:12 PM
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Join Date: Dec 2010
Location: Hilton Head Island
Posts: 1,089
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Quote:
Originally Posted by Radomir
Not having GPS hooked into your ES transponder will render it useless for the that purpose..
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Should have said....I don't have an approved WAAS GPS, so I am technically not 2020 compliant.
__________________
John Mastro
RV-8
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01-21-2013, 04:16 PM
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Join Date: Jul 2008
Location: Plymouth, MA
Posts: 133
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I believe the GPS is wired both ways, that was part of the discussion I had w/the avionics shop prior to getting the ES upgrade. I just sent the shop an email to confirm this and to ask what the Xpdr settings should be so I can double check it.
I did not know that my current configuration...GDL 39/GTX 330 ES/Aera 796, would not be compliant in 2020 though?????
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