Clay Johnson Posted February 19, 2019 Report Share Posted February 19, 2019 I’m looking for advice from those who have installed the GDL 82. Did you install the GPS antenna on the exterior or inside the cabin, e.g. on the glare shield? Quote Link to comment Share on other sites More sharing options...
FlyingMonkey Posted February 19, 2019 Report Share Posted February 19, 2019 I'm planning to put mine on the glare shield. It can always be moved if reception issues come up, but I highly doubt they will. Quote Link to comment Share on other sites More sharing options...
Tom Baker Posted February 19, 2019 Report Share Posted February 19, 2019 I recently got a MRA, and it calls for it to be mounted externally on the cabin roof. Quote Link to comment Share on other sites More sharing options...
MEH Posted February 20, 2019 Report Share Posted February 20, 2019 I got an MRA to install the GDL 82 and the GDL 39 on a tray I built that sits just aft of, and attaches to, the mount of the 696. Works fine. The ADS-B flight check had no problems. No holes in the roof and nothing visible on the glare shield except the residue of the goo left over from the adhesive left over from removing the XM antenna. If I were to do it over again, I would make the tray shorter and sit slightly lower (longer tab that attaches to the 696). The tray comes close to the firewall and doesn't need to be quite that big. The tray acts as the ground plane for the antenna and the box for the GDL 82 is mounted beneath. FD-USA put the caveat in the MRA that if it failed the ADS-B flight test I would have to do something different. Quote Link to comment Share on other sites More sharing options...
Clay Johnson Posted February 20, 2019 Author Report Share Posted February 20, 2019 If I try the antenna on top of the glare shield, is it a good idea to put a ground plane under it? Should it be bonded to the avionics frame? Quote Link to comment Share on other sites More sharing options...
MEH Posted February 20, 2019 Report Share Posted February 20, 2019 The antenna won't work well unless it has a certain number of square inches of metal in contact with it. Foil tape under the mushroom worked just fine in a friend's CT. I have seen a Citabria that used the foil tape as well. The trick would be to ensure electrical contact of the tape with the antenna. Maybe put an aluminum doubler under the mushroom which the antenna mounting screws attach. I believe the GA-35 antenna specs out a 7" diameter disc at a minimum. One would have to do the math to get equivalent or better square inches of foil tape. Quote Link to comment Share on other sites More sharing options...
FlyingMonkey Posted February 20, 2019 Report Share Posted February 20, 2019 I know a ground plane is specified, but I'm not sure if it's actually required for it to work. I have a GPS antenna on my glareshield now that came with my 496 and it works fine. I'd have to check to know for sure, but I don't think it has a ground plane under it. Quote Link to comment Share on other sites More sharing options...
SportFlyer1 Posted February 20, 2019 Report Share Posted February 20, 2019 I believe the ground plane is only needed if the antenna transmits, which only GPS antennas don't. Quote Link to comment Share on other sites More sharing options...
MEH Posted February 20, 2019 Report Share Posted February 20, 2019 According to the GDL-82 install manual, the ground plane is required. "The GPS/SBAS antenna requires a minimum ground plane radius of 7.5 inches around the perimeter of the antenna." From Page 6-8 of the GDL-82 installation manual. Quote Link to comment Share on other sites More sharing options...
SportFlyer1 Posted February 21, 2019 Report Share Posted February 21, 2019 Yep, there it is. They seem to be talking about a top of the airplane install, but it should be the same requirement. I wonder if my XM/GPS on the glare shield actually has one? Quote Link to comment Share on other sites More sharing options...
Clay Johnson Posted March 29, 2019 Author Report Share Posted March 29, 2019 Thanks for the idea of mounting it on a tray behind the 696. That’s what I did. Quote Link to comment Share on other sites More sharing options...
MEH Posted March 29, 2019 Report Share Posted March 29, 2019 Awesome! Quote Link to comment Share on other sites More sharing options...
bitten192 Posted April 9, 2019 Report Share Posted April 9, 2019 REMOS G3 Al tape for a ground plane Quote Link to comment Share on other sites More sharing options...
WmInce Posted April 9, 2019 Report Share Posted April 9, 2019 Quote Link to comment Share on other sites More sharing options...
Marcelo Riegel Posted February 25 Report Share Posted February 25 Good afternoon Can you be seen on Flight Radar 24 with the GDL82? I have installed the GDL82 on my aircraft and cannot be located on the FR24 Quote Link to comment Share on other sites More sharing options...
Tom Baker Posted February 25 Report Share Posted February 25 I'm not sure about Flight Radar or Brazil. I use Flightaware, and my GDL 82 equipped airplane does not show up all of the time. The GDL 82 is a 978 frequency. Now the 1090 airplanes always show up. Quote Link to comment Share on other sites More sharing options...
FredG Posted February 25 Report Share Posted February 25 I installed a GDL 82 in my 2006 CTsw (ELSA) flown in the US. I am not aware of any problems with it being detected by other pilots with ADSB-in and my FAA Public ADS-B Performance Reports have been good. Have no experience with FR24. Quote Link to comment Share on other sites More sharing options...
Tom Baker Posted February 26 Report Share Posted February 26 1 hour ago, FredG said: I installed a GDL 82 in my 2006 CTsw (ELSA) flown in the US. I am not aware of any problems with it being detected by other pilots with ADSB-in and my FAA Public ADS-B Performance Reports have been good. Have no experience with FR24. I don't think there is any issues with other pilots or the FAA being able to see it. The only issue is with the ground antenna that are providing info for FR24 or Flight aware. They are privately owned antenna, and may not always report the info. At least that is my understanding. Quote Link to comment Share on other sites More sharing options...
airhound Posted February 26 Report Share Posted February 26 https://flightaware.com/squawks/view/1/7_days/popular_new/95072/FAA_Urges_Pilots_to_Rely_on_Traditional_Navigation_Amid_Rising_GPS_Spoofing_Threats fellas, other than a sectional and whisky compass, what’s your alternate means of nav? Maybe a HH with VOR, or ? Quote Link to comment Share on other sites More sharing options...
Anticept Posted February 26 Report Share Posted February 26 Eyes out the window. It's not hard to crosscheck cities and landmarks. Many popular IFR avionics have rejection capabilities too. Quote Link to comment Share on other sites More sharing options...
Jim Meade Posted February 26 Report Share Posted February 26 You take a longer flight in many parts of Iowa and you will have to buzz the water tower to know what town you are over. There'll be a town every 6 or so miles on a grid and unless you know which side of the tracks the grain elevator is on you won't know Belle Plain from Newhall from Van Horne. In the old days, there would be the name of the airport and an arrow on some large building roof, but you almost never see that anymore. How many of you have seen the arrow to the airport? Quote Link to comment Share on other sites More sharing options...
shiny.ice Posted February 26 Report Share Posted February 26 19 hours ago, airhound said: https://flightaware.com/squawks/view/1/7_days/popular_new/95072/FAA_Urges_Pilots_to_Rely_on_Traditional_Navigation_Amid_Rising_GPS_Spoofing_Threats fellas, other than a sectional and whisky compass, what’s your alternate means of nav? Maybe a HH with VOR, or ? What does this have to do with transmitting and receiving ADSB? Quote Link to comment Share on other sites More sharing options...
airhound Posted February 27 Report Share Posted February 27 (edited) Adsb is gps based. GPS is becoming less tenable more and more due to bad actors. Thought I’d pulse fellow pilots currently focused on anything GPS for alternatives. Please excuse me diverging from this threads topic. Kindly, what is your plan for alternate navigational aids? Especially when navigating in unfamiliar airspace. Edited February 27 by airhound Quote Link to comment Share on other sites More sharing options...
FlyingMonkey Posted February 27 Report Share Posted February 27 2 hours ago, airhound said: Adsb is gps based. GPS is becoming less tenable more and more due to bad actors. Thought I’d pulse fellow pilots currently focused on anything GPS for alternatives. Please excuse me diverging from this threads topic. Kindly, what is your plan for alternate navigational aids? Especially when navigating in unfamiliar airspace. GPS has stayed very reliable in my experience. My alternate nav method is my eyeballs and the sectionals on my iPad. Quote Link to comment Share on other sites More sharing options...
bitten192 Posted February 27 Report Share Posted February 27 External GPS antenna. I used aluminum tape on the inside of the fuselage for a ground plane since my REMOS is carbon fiber Quote Link to comment Share on other sites More sharing options...
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