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12-29-2012, 04:59 PM
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Join Date: Feb 2011
Location: USA
Posts: 3,179
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Mike & Matt,
Thanks for this thread and the related one on bare wire connectivity for the Aera 796.
The data in the two threads made it a snap today as I built my panel RS232 wiring! My GDL 39 is feeding ADSB to my 795 and the 795 is feeding both my MGL V10 radio with frequencies and the TruTrak AP with tracking data.
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12-30-2012, 04:28 AM
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Join Date: Nov 2011
Location: Amelia, Va
Posts: 268
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tablet and gdl-39
OK.
So I am using Gamin Pilot on my Samsung Galaxy tab. I am to receive the GDL -39 on Tuesday. The tab already has a gps receiver in it but the GDL-39's receiver must be superior to it. Will it automatically take over or will i have to turn off the gps on the tablet?
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12-30-2012, 07:56 AM
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Join Date: Aug 2005
Location: Grass Lake, MI
Posts: 128
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Quote:
Originally Posted by Brantel
You still need both.
One does not take over GPS duties for the other....
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I have a GDL39 hard wired to my 696 and blue toothed to my iPhone and iPad. I mounted the GDL under my fiberglass cowling near the top just in front of the firewall. The GPS in the GDL reads great through the cowl and I remote mounted the ADS-B antenna on the belly. The GDL sends the GPS data to my iPad, along with the traffic and weather. Mounted in this fashion, you do not need another remote mounted GPS antenna.
-Mike Kraus
RV-4 Sold
RV-10 Flying
KitFox SS7 Building
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12-30-2012, 08:10 AM
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Join Date: Dec 2004
Location: Gold Hill, NC25
Posts: 2,400
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Quote:
Originally Posted by mkraus01
I have a GDL39 hard wired to my 696 and blue toothed to my iPhone and iPad. I mounted the GDL under my fiberglass cowling near the top just in front of the firewall. The GPS in the GDL reads great through the cowl and I remote mounted the ADS-B antenna on the belly. The GDL sends the GPS data to my iPad, along with the traffic and weather. Mounted in this fashion, you do not need another remote mounted GPS antenna.
-Mike Kraus
RV-4 Sold
RV-10 Flying
KitFox SS7 Building
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Actually this is a problem. The reason is that the 696 will NOT fail over to the GDL GPS data over BT or Serial. If your 696 always has clear sky then your probably fine. If its on a panel, and you end up in the right conditions (little glare shield cover, little weather to reduce signal strength etc), the 696 WILL loose GPS position and it WONT take it from the GDL stream. I had this happen before I decided an external GPS antenna on the 696/796 was required for me. I also tried covering my 796 internal antenna while the gdl 39 was clear view. I tried this with both BT and serial. It will loose GPS and fail even if the GDL has GPS lock. There is probably a reason why Garmin choose not to use the GDL GPS on a fail over but I cant think of a reason why. In most installations, the GDL is going to have good view, unless remote mounted. In most cases the 796 is going to have obstructions. Just my 2 cents.
As for other devices, its the application that determines what data it will use. Ipads, Android etc can have several GPS data streams running around available to it. It has nothing to do with which one is 'superior'.
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Kahuna
6A, S8 ,
Gold Hill, NC25
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12-30-2012, 08:15 AM
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Join Date: Mar 2006
Location: Newport, TN
Posts: 7,496
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Quote:
Originally Posted by mkraus01
I have a GDL39 hard wired to my 696 and blue toothed to my iPhone and iPad. I mounted the GDL under my fiberglass cowling near the top just in front of the firewall. The GPS in the GDL reads great through the cowl and I remote mounted the ADS-B antenna on the belly. The GDL sends the GPS data to my iPad, along with the traffic and weather. Mounted in this fashion, you do not need another remote mounted GPS antenna.
-Mike Kraus
RV-4 Sold
RV-10 Flying
KitFox SS7 Building
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As long as you have the GDL39 mounted where its built in antenna can get a clear view of the sky then I agree with you, you won't need an external GDL39 GPS antenna. If you mount it where it cannot, you will need an external antenna. The OP asked about a 796, not an Ipad.
As for an external 796/696 GPS antenna, the GDL39 does not serve as the GPS for a 796 (or 696) like it can for the Ipad therefore if you do not have good satellite coverage on your 696/796, it will also need an external antenna even if it is hooked up to a GDL39 with a perfect sat lock.
Last edited by Brantel : 12-30-2012 at 08:20 AM.
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12-30-2012, 10:04 AM
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Join Date: Feb 2011
Location: USA
Posts: 3,179
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Down the road, the GDL 39 might provide GPS OUT. That said, I have a remote GPS connected to the GDL, since, for the time being, both the GDL 39 and the 796 need their own GPS signals.
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12-30-2012, 10:13 AM
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Join Date: Mar 2006
Location: Newport, TN
Posts: 7,496
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While someday I think you might see the GDL39 being able to use the GPS data from the portable GPS (eliminating the need for an external GDL39 GPS antenna), I doubt you will ever see the GDL39 being able to supply GPS data to the portable GPS.
When you think about it, it would not be desirable to have the GDL39 provide GPS data to the portable GPS. One would lose the tight integration and the high update rate that is possible with the build in GPS.
Also to prevent confusing others, with the GDL39 and the Garmin Portable GPS's, the remote antenna is just that, a remote antenna. There is no GPS inside the puck.
Last edited by Brantel : 12-30-2012 at 10:17 AM.
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12-30-2012, 10:45 AM
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Join Date: Oct 2005
Location: 08A
Posts: 9,500
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Quote:
Originally Posted by humptybump
Down the road, the GDL 39 might provide GPS OUT. That said, I have a remote GPS connected to the GDL, since, for the time being, both the GDL 39 and the 796 need their own GPS signals.
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Do I understand correctly.....the only purpose for the GDL39's internal GPS is so it knows its own position in order to process the traffic display?
__________________
Dan Horton
RV-8 SS
Barrett IO-390
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12-30-2012, 10:57 AM
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Join Date: Mar 2006
Location: Newport, TN
Posts: 7,496
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Quote:
Originally Posted by DanH
Do I understand correctly.....the only purpose for the GDL39's internal GPS is so it knows its own position in order to process the traffic display?
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It can also serve as an external GPS for phones and tablets over BlueTooth.
More info here.
Last edited by Brantel : 12-30-2012 at 11:00 AM.
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12-30-2012, 11:02 AM
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Join Date: Feb 2011
Location: USA
Posts: 3,179
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The GDL 39 GPS serves two purposes - it is used for its own calculations (weather location and traffic info) and to serve as a GPS for Bluetooth devices. Since it already sends GPS location data over Bluetooth, it suggests that a firmware update could bring this capability to the hard wired serial lines.
Given the GDL 39 serves both the certified fleet as well as the Experimental fleet, the non-hardwired configurations need to be as complete as possible. With a tablet (or 796 on a yoke) and a battery backed GDL 39 on the glare screen, a pilot in a certified aircraft can have nearly the same level of modern equipment we can build into our panels. 
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