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  #51  
Old 02-06-2018, 03:21 PM
TrekLawler TrekLawler is offline
 
Join Date: Apr 2013
Location: Kansas City, MO.
Posts: 41
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Quote:
Originally Posted by nomocom View Post
One thing to be aware of before going the GDL 82 route is you may need a new transponder antenna. Install manual, page 4-4 lists the antennas that apparently perform well enough at the 3 frequencies, 978, 1030, and 1090. These are not the everyday mode C antennas that are tuned for the 1030 and 1090 and are likely already on your bird.
Stan,
just as an FYI, the list in the manual is just a reference for recommended antenna's that we have tested in the event that one might need to be replaced. the GDL 82 is designed and intended for use with current airframe systems in most cases and if you have a good, in working order transponder L band antenna, it will do just fine with no need for a replacement.
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  #52  
Old 02-13-2018, 02:03 PM
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nomocom nomocom is offline
 
Join Date: Jun 2009
Location: Caldwell ID
Posts: 242
Default L-band Antennae

Quote:
Originally Posted by TrekLawler View Post
if you have a good, in working order transponder L band antenna, it will do just fine with no need for a replacement.
That sounds like a common sense approach. The manual (section 4.4) arguably eliminates a common sense approach saying....

"The GDL 82 requires the existing L-Band Ultra-High Frequency (UHF) antenna(s) meet the following specifications:  Standard 50 ohm vertically polarized antenna with a VSWR < 1.7:1 at 978 MHz and < 1.5:1 at 1090 MHz..."

I have a common transponder antenna, a CI-101 and VSWR at 978 is not listed. The Ted monopole for ADS-B doesn't publish for 1090. IMO, if one is a stickler, there is going to be some more work to measure the VSWR, or dollars spent on an already tested antenna.

My test flight went fine. Because I have an antenna intended for 1030 and 1090, I will be curious to see how good 978 out is, compared to other UAT installs.
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1990 RV-3 (now apart, upgrades in the works)
1959 C172 O-360

Last edited by nomocom : 02-14-2018 at 11:45 AM. Reason: grammar
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  #53  
Old 02-13-2018, 02:13 PM
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nomocom nomocom is offline
 
Join Date: Jun 2009
Location: Caldwell ID
Posts: 242
Default Figure 5.1 in the install manual wrong

Figure 5.1 shows connector J821 and the middle row of pins shifted incorrectly to the right. It doesn't matter how many times the connector is turned over, still can't make it look like Figure 5.1! (Pin 10 is proud when 6 should be) So the figure was ignored and the connector was wired per TABLE 5.1 and everything works as expected. Those with young eyes, this may be academic, but for those with presbyopia, we go through life looking at shapes and arrangements, paying less attention to those darn little numbers!

**Garmin Support replies Rev. 4 of the install manual will have the correction.
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1990 RV-3 (now apart, upgrades in the works)
1959 C172 O-360

Last edited by nomocom : 02-14-2018 at 03:03 PM. Reason: update
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  #54  
Old 02-13-2018, 10:20 PM
wookiemail wookiemail is offline
 
Join Date: Dec 2017
Location: Loveland CO
Posts: 27
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I noticed that too. The colors in the USB cable are reversed from the common
definitions but it works the way shown in the install manual. Having a bit of a
struggle with VHF interference. Everything else was really slick!! BH
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  #55  
Old 02-15-2018, 09:56 PM
Shawn25854 Shawn25854 is offline
 
Join Date: Aug 2014
Location: Clearwater, FL / KZPH
Posts: 137
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Quote:
Originally Posted by wookiemail View Post
I noticed that too. The colors in the USB cable are reversed from the common
definitions but it works the way shown in the install manual. Having a bit of a
struggle with VHF interference. Everything else was really slick!! BH
The VHF interference could be coming from your ELT. Is your COM antenna close to your ELT antenna? Do you have an older 121.5 ELT? If so try disconnecting the ELT antenna from the ELT and try the COM tests again. If the symptoms go away you'll need a notch filter or to update your ELT to the new GPS version.

This is a known issue.

Last edited by Shawn25854 : 02-21-2018 at 08:40 PM.
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  #56  
Old 02-15-2018, 10:16 PM
wookiemail wookiemail is offline
 
Join Date: Dec 2017
Location: Loveland CO
Posts: 27
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Yes, ELTs are usually a disaster. It might be in this case. Haven't tried putting one of those GPS harmonic traps on the ELT--ought to work. Thanks BH
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  #57  
Old 03-04-2018, 07:12 PM
hiline hiline is offline
 
Join Date: Nov 2017
Location: El Dorado Hills,Ca
Posts: 1
Default GDL82

Quote:
Originally Posted by nomocom View Post
Figure 5.1 shows connector J821 and the middle row of pins shifted incorrectly to the right. It doesn't matter how many times the connector is turned over, still can't make it look like Figure 5.1! (Pin 10 is proud when 6 should be) So the figure was ignored and the connector was wired per TABLE 5.1 and everything works as expected. Those with young eyes, this may be academic, but for those with presbyopia, we go through life looking at shapes and arrangements, paying less attention to those darn little numbers!

**Garmin Support replies Rev. 4 of the install manual will have the correction.
You are correct,the picture is incorrect and the middle row is shifted to the right and should be to the left,the pin numbers are on all the pieces though just to verify when you push the pins in.
Funny how they didn't catch this.
Everything else is correct though.
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  #58  
Old 03-05-2018, 01:09 PM
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mv031161 mv031161 is offline
 
Join Date: Jan 2010
Location: Tybee Island, GA
Posts: 624
Default 1090 Version

For those of us that fly outside the US in our aircraft, we need the 1090 version w same price point access.
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1965 PA32-260 "God Bless America" (sold 12/2016)
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  #59  
Old 03-05-2018, 10:31 PM
rcwagner55 rcwagner55 is offline
 
Join Date: Dec 2017
Location: Twisp, WA.
Posts: 4
Default GDL 82 Does not work

Installed the GDL 82 a couple of days ago. Very simple to install, but it does not send out ADS-B to ATC. Checked the configuration several times and by all indicators on the computer, it is working, ATC does not receive any ADSB data. I think Garmin hasn't worked the bugs out of this device yet. In retrospect, I would have bought some other unit. This is an expensive experiment. Anyone having this kind of experience with their installation?

Last edited by rcwagner55 : 03-05-2018 at 10:36 PM.
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  #60  
Old 03-05-2018, 10:46 PM
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flytoday flytoday is offline
 
Join Date: Jun 2011
Location: Houston, TX
Posts: 343
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Quote:
Originally Posted by rcwagner55 View Post
Installed the GDL 82 a couple of days ago. Very simple to install, but it does not send out ADS-B to ATC. Checked the configuration several times and by all indicators on the computer, it is working, ATC does not receive any ADSB data. I think Garmin hasn't worked the bugs out of this device yet. In retrospect, I would have bought some other unit. This is an expensive experiment. Anyone having this kind of experience with their installation?
I’m not sure how to interpret your note.

I installed a GDL82 about a month ago. Although I have talked, on freq, to HOU Appch and GLS tower, they don’t see my ADS-B out.

However, when I use the ADS-B performance test website

https://adsbperformance.faa.gov/PAPRRequest.aspx

it reports that my GDL82 is working fine. Not a single error. So I trust that my GDL82 is working fine, meets the 2020 requirement etc....

It has been discussed on other VAF threads that, at least in some areas, ATC doesn’t seem to have the equipment and/or training to “see” the ADS-B out data.

Another way to test it would be to operate ForeFlight with an ADS-B receiver like Scout or a GDL39 and see if the ADS-B data appears. If you test that in your own plane, you may only see your data for a second or two, then ForeFlight figures out that it is your own plane, and stops displaying your own data on top of your plane. Then you can look in ForeFlight, More, Devices, and drill into the Ownship data to see what your GDL82 is transmitting.

Carl
..
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Last edited by flytoday : 03-05-2018 at 10:52 PM.
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