VansAirForceForums  
Home > VansAirForceForums

-POSTING RULES
-Advertise in here!
- Today's Posts | Insert Pics

Keep VAF Going
Donate methods

Point your
camera app here
to donate fast.


Go Back   VAF Forums > Avionics / Interiors / Fiberglass > GPS
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 03-24-2021, 10:27 AM
uk_figs's Avatar
uk_figs uk_figs is offline
 
Join Date: Jan 2005
Location: Tulsa, OK
Posts: 1,066
Default Lowest cost GPS navigator options

Looking at the options to add GPS navigation/approaches to my legacy glass panel (D100, SL30, HS34, 327, GDL82, GDL39, 796, Gemini A/P).
Are there any lower cost alternatives to the Garmin 175/375 that should be considered that can fly GPS approaches (arinc 429 to the Gemini A/P)?
I do not want to rip out and replace the entire panel.
Appreciate any (printable ) suggestions.
Figs
__________________
Dave (Figs) (RV-7 N256F, Flying)
Dave's RV-7 Blog
Email me
Reply With Quote
  #2  
Old 03-24-2021, 10:32 AM
YellowJacket RV9 YellowJacket RV9 is offline
 
Join Date: Oct 2012
Location: Clearwater, FL KCLW
Posts: 1,318
Default

I am thinking about pulling the trigger on an IFR upgrade, and to me, it looks hard to beat the GPS 175. I see used GPS400W's on the market for $3500-4000, which is barely less than a 175, and for way less functionality and little to no support from Garmin anymore. It's certainly not cheap, but even the older used units aren't much cheaper, so might as well go with newer and better.

I'm all ears if somebody has a comparable but cheaper solution.

Chris
__________________
Chris Johnson
RV-9A - Done(ish) 4/5/16! Flying 4/7/16
Reply With Quote
  #3  
Old 03-24-2021, 12:24 PM
BobTurner BobTurner is offline
 
Join Date: Dec 2011
Location: Livermore, CA
Posts: 7,349
Default

Quote:
Originally Posted by YellowJacket RV9 View Post

I'm all ears if somebody has a comparable but cheaper solution.

Chris
Apparently the cost of getting a TSO is phenomenal. For a while GRT offered a $750 software package with their HXr and $500 gps which contained every US gps approach, but no TSO. They said up front, ‘vfr only’. I don’t think it sold well.
Reply With Quote
  #4  
Old 03-25-2021, 11:56 AM
uk_figs's Avatar
uk_figs uk_figs is offline
 
Join Date: Jan 2005
Location: Tulsa, OK
Posts: 1,066
Default More questions

A few follow up questions:
1. If I installed the 175, can the GDL 82 GPS antenna signal be split to support both units or would I need another GA 35 GPS antenna.
3. If I went with the 375 assume I could reuse the GDL 82 and GTX 327 antennas but would I need another antenna for the ADSB In (the 375 installation guide only shows one xponder antenna)?
Thanks
Figs
__________________
Dave (Figs) (RV-7 N256F, Flying)
Dave's RV-7 Blog
Email me
Reply With Quote
  #5  
Old 03-25-2021, 12:35 PM
Pdtofly Pdtofly is offline
 
Join Date: Jan 2012
Location: Reno, NV
Posts: 493
Default Go with two GPS antennas

Quote:
Originally Posted by uk_figs View Post
A few follow up questions:
1. If I installed the 175, can the GDL 82 GPS antenna signal be split to support both units or would I need another GA 35 GPS antenna.
3. If I went with the 375 assume I could reuse the GDL 82 and GTX 327 antennas but would I need another antenna for the ADSB In (the 375 installation guide only shows one xponder antenna)?
Thanks
Figs
Figs,

Where the GDL82 and both the 175 and 375 use the same GPS antenna, it is really not good to share that antenna. There are a few GPS antenna splitters on the market, but if you get a weak signal because it goes through a splitter, and you position drops to many times, you will get a letter from the Feds that you are not in compliance and will be told to fix it, and if you don’t do it in 45 days, you will be put on a naughty list. Yes, there is one. It is just easier to mount both antennas.

As for the 375, there is only one transponder antenna connected to the unit, and it uses that antenna for both out and in.

I did install a 375 a year ago in a friends RV6, and it works fine for both in and out using just the one transponder antenna.

If I needed to do this again, and money was not a restriction, get the 375, use the same GA35 antenna, and transponder antenna, and sell the GDL82 and the GTX327.

Note, if you really want to spit the GPS signal, go to eBay and look for GPS Splitters. Many listed. They do work, but are they worth the pain you might get if they don’t?

Good luck.
Reply With Quote
  #6  
Old 03-25-2021, 01:17 PM
Walt's Avatar
Walt Walt is online now
 
Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 6,011
Default

DO NOT split the GPS antenna output.
And I agree with the above, install the 375 and sell the 327/GDL82/GDL39.
__________________
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, 1900+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154

Last edited by Walt : 03-25-2021 at 01:22 PM.
Reply With Quote
  #7  
Old 03-25-2021, 03:20 PM
larryMar larryMar is offline
 
Join Date: Nov 2018
Location: C77, Il
Posts: 41
Default

If the 375 is like the 430, you should have the ability to feed the signal to the GDL with a single wire. Can't think right now - RS232? or some such port. Look at the install manuals for each.
Reply With Quote
  #8  
Old 03-25-2021, 03:32 PM
Pdtofly Pdtofly is offline
 
Join Date: Jan 2012
Location: Reno, NV
Posts: 493
Default GNX375

Quote:
Originally Posted by larryMar View Post
If the 375 is like the 430, you should have the ability to feed the signal to the GDL with a single wire. Can't think right now - RS232? or some such port. Look at the install manuals for each.
Larry,

The GNX375 is the GPS175 with a built in transponder, so it has both ADSB OUT and IN. ADSB is displayed on an iPad. You don’t need the GDL for ADSB IN.

Last edited by Pdtofly : 03-25-2021 at 03:35 PM.
Reply With Quote
  #9  
Old 03-25-2021, 07:23 PM
PNLBLDR PNLBLDR is offline
 
Join Date: Aug 2014
Location: Minnesota
Posts: 27
Default Antenna

If you keep the gdl82, you can reuse that ga-35 antenna for the gps-175 and then connect the 175 to the gdl via res-232. You could buy the GPS-175 without the antenna for less than $4K.
__________________
Nick Millard
Operations Director
SteinAir, Inc.
Reply With Quote
  #10  
Old 03-26-2021, 05:50 AM
Pdtofly Pdtofly is offline
 
Join Date: Jan 2012
Location: Reno, NV
Posts: 493
Default Question

Quote:
Originally Posted by PNLBLDR View Post
If you keep the gdl82, you can reuse that ga-35 antenna for the gps-175 and then connect the 175 to the gdl via res-232. You could buy the GPS-175 without the antenna for less than $4K.
Nick,

The install manual says it will only connect to a GDL88, since I know you guys know more than I do, will it also connect to a GDL82?

Thanks for the info.

Brian
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 05:06 AM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.