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04-18-2019, 03:07 PM
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Join Date: Aug 2017
Location: Zeeland, MI
Posts: 25
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ADS-B WAAS Source Decision
Hello.
I am weighing the choice between using an existing Garmin GNS-430W unit as my ADS-B WAAS source vs. buying a stand-alone ADS-B WAAS GPS antenna.
Adding a serial data wire to the Garmin's rear connector would cost less, but I have some concerns about the lack of redundancy.
If the GNS-430W needed to be shut down, I would be losing more than just primary navigational GPS data.
What are your thoughts on flying with a single-source GPS WAAS device vs installing a stand-alone ADS-B WAAS antenna?
Thanks,
Dale
__________________
Dale DeWeese
RV-9A Owner
EAA Chapter 211 Member
Zeeland, MI (Z98)
VAF Dues Paid
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04-18-2019, 04:41 PM
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Join Date: May 2005
Location: Rochester Hills, MI
Posts: 879
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I would use the 430 and move on... Lack of ADS-B position redundancy is extremely low on my worry list.
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Dennis Glaeser CFII
Rochester Hills, MI
RV-7A - Eggenfellner H6, GRT Sport ES, EIS4000, 300XL, SL30, TT Gemini, PMA6000, AK950L, GT320,
uAvionixEcho ADSB in/out with GRT Safe Fly GPS
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04-18-2019, 04:53 PM
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Join Date: Dec 2011
Location: Livermore, CA
Posts: 6,797
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+1. Unless you are planning on some sort of switching arrangement, you?ll be dependent on one gps source, whatever it is. Wire it to the 430W and move on.
PS. Make sure your 430W software is new enough to offer an ?ADSB+? output.
PPS Working on that connector, you wish you had 3 hands.
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04-18-2019, 06:30 PM
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Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,686
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Quote:
Originally Posted by Dale D
What are your thoughts on flying with a single-source GPS WAAS device vs installing a stand-alone ADS-B WAAS antenna?
Thanks,
Dale
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What exactly are you referring to as a stand-alone GPS WAAS antenna that will provide ADS-B?
__________________
Walt Aronow, DFW, TX (52F)
EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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04-18-2019, 07:03 PM
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Join Date: Aug 2017
Location: Zeeland, MI
Posts: 25
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Quote:
Originally Posted by Walt
What exactly are you referring to as a stand-alone GPS WAAS antenna that will provide ADS-B?
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Walt,
By stand-alone GPS WAAS antenna, I?m referring to a GPS antenna that is dedicated to providing position data to whatever ADS-B device I end up installing.
Probably poor wording on my part.
Regards,
Dale
__________________
Dale DeWeese
RV-9A Owner
EAA Chapter 211 Member
Zeeland, MI (Z98)
VAF Dues Paid
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04-18-2019, 07:32 PM
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Join Date: Feb 2015
Location: Fort Worth
Posts: 527
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The absolute last failure I care about while flying is ADS-B. In or Out.
__________________
Rob
RV-6A (Purchased)
2020 Dues Paid, of course
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04-19-2019, 05:18 AM
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Join Date: Mar 2010
Location: KSGJ / TJBQ
Posts: 2,039
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Quote:
Originally Posted by BobTurner
+1. Unless you are planning on some sort of switching arrangement, you?ll be dependent on one gps source, whatever it is. Wire it to the 430W and move on.
PS. Make sure your 430W software is new enough to offer an ?ADSB+? output.
PPS Working on that connector, you wish you had 3 hands.
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+2 for using the G430W. It is EXACTLY what I did back in 2013 and am glad I did.

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Galin
CP-ASEL-AMEL-IR
FCC Radiotelephone (PG) with Radar Endorsement
2020 Donation made
www.PuertoRicoFlyer.com
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04-19-2019, 08:53 AM
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Join Date: Apr 2012
Location: Tampa (Wimauma actually)
Posts: 421
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Use the 430W
I used the 430W as my GPS source when I installed my GTX-345. It wasn't hard but there was a lot of learning involved.
The advantage for me was that I made the other connections necessary to allow the 430W to display both ADSB traffic and weather. That required some additional connections between the 430W and the 345.
Had I not been making the other connections, I might have used a separate antenna so as to avoid opening up the 430W connectors and figuring out all the wiring requirements.
__________________
Randy King
Tampa (Wimauma), Florida
RV-4 N212CS (sold)
RV-8 N184RK (flying)
Flying an A320 to pay the bills
Exempt and gladly donating anyway - Current through March 2021
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