|
-
POSTING RULES
-
Donate yearly (please).
-
Advertise in here!
-
Today's Posts
|
Insert Pics
|
12-22-2016, 06:01 PM
|
|
|
|
Join Date: Jul 2016
Location: DFW TEXAS
Posts: 2
|
|
WAAS ANTENNA SPLITTER
I have a GNS430 non WAAS and will be installing a Garmin G5 that requires a WAAS ant. and a ADS-B that requires a WAAS ant. Is there a splitter that is made that will work for this if I change out my GNS430's antenna and use a WAAS antenna so I don't have all these antennas sticking out?
|
12-22-2016, 06:18 PM
|
|
|
|
Join Date: Dec 2011
Location: Livermore, CA
Posts: 6,767
|
|
Short answer is no. Any splitting reduces the signal, and it's already tiny. Also, some boxes/antennas have a preamp in the antenna, so you have D.C. power running up the coax. Best not to mix.
|
12-22-2016, 07:16 PM
|
 |
|
|
Join Date: May 2005
Location: X35 - Ocala, FL
Posts: 3,679
|
|
You cannot share an antenna, but the G430 can output a position source to both other items via RS232. Also, the G5 has a built-in antenna that is usually adequate.
__________________
Jesse Saint
|
12-22-2016, 09:15 PM
|
 |
|
|
Join Date: Mar 2010
Location: KSGJ / TJBQ
Posts: 2,034
|
|
Quote:
Originally Posted by BobTurner
Short answer is no. Any splitting reduces the signal, and it's already tiny. Also, some boxes/antennas have a preamp in the antenna, so you have D.C. power running up the coax. Best not to mix.
|
EXACTLY! Besides, do you really want to risk damaging your $$$ G430 unit? 
__________________
Galin
CP-ASEL-AMEL-IR
FCC Radiotelephone (PG) with Radar Endorsement
2020 Donation made
www.PuertoRicoFlyer.com
|
12-23-2016, 04:03 PM
|
 |
|
|
Join Date: Jan 2005
Location: Tampa, FL
Posts: 2,861
|
|
Quote:
Originally Posted by BobTurner
Short answer is no. Any splitting reduces the signal, and it's already tiny. Also, some boxes/antennas have a preamp in the antenna, so you have D.C. power running up the coax. Best not to mix.
|
Especially if you are using the navigator for IFR. Even though we're E-AB, for IFR I'd recommend following the Garmin installation instructions regarding anything dealing with antennas to the letter. YMMV....
__________________
Todd "I drink and know things" Stovall
PP ASEL-IA
RV-10 N728TT - Flying!
WAR EAGLE!
|
12-24-2017, 10:38 AM
|
|
|
|
Join Date: Feb 2017
Location: Grasss Valley, CA
Posts: 32
|
|
Not only is it possible, it is trivially simple. Especially so if you have an "active" gps antenna, one that has 25-30 dB of gain to overcome the loss of the coax going from the antenna to the GPS.
What is another 3 dB (a perfect power split) with a simple Wilkinson coupler?
Watch this thread. I'm working on one right now. So far the least expensive splitter I've found is north of $200. If I can't do it for less than $73 I won't bother taking your time.
Of course, as with all RST Engineering stuff it will be a kit that you have to assemble yourself, but it will probably be half a dozen solder joints at the max.
Jim
|
12-24-2017, 04:10 PM
|
|
|
|
Join Date: Mar 2010
Location: KSGJ / TJBQ
Posts: 2,034
|
|
Quote:
Originally Posted by jweir43
What is another 3 dB (a perfect power split) with a simple Wilkinson coupler?
|
Because 3db is a 50% reduction in power. Not trivial when the total available power at earth level is around 100 attowats.
That many GPS receivers will work at even much lower levels is a given, but I am not risking my life flying actual IMC with a GPS receiving 50% of what it should be getting. I justify spending that extra $$$ the same way I justify spending $$$ on insurance. Rather have it and not need it, than need it and not have it. YMMV
__________________
Galin
CP-ASEL-AMEL-IR
FCC Radiotelephone (PG) with Radar Endorsement
2020 Donation made
www.PuertoRicoFlyer.com
Last edited by GalinHdz : 12-24-2017 at 04:17 PM.
|
12-24-2017, 04:12 PM
|
|
Super Moderator
|
|
Join Date: May 2005
Location: Locust Grove, GA
Posts: 2,624
|
|
Quote:
Originally Posted by jweir43
Not only is it possible, it is trivially simple. Especially so if you have an "active" gps antenna, one that has 25-30 dB of gain to overcome the loss of the coax going from the antenna to the GPS.
What is another 3 dB (a perfect power split) with a simple Wilkinson coupler?
Watch this thread. I'm working on one right now. So far the least expensive splitter I've found is north of $200. If I can't do it for less than $73 I won't bother taking your time.
Of course, as with all RST Engineering stuff it will be a kit that you have to assemble yourself, but it will probably be half a dozen solder joints at the max.
Jim
|
Jim has been my hero since I could read Kitplanes! I swear the all of the electrons in the known universe are just sitting around waiting for him to tell them which way to go!
I STILL have articles I tore out of magazines as I was building over the years. 
Vic
__________________
 Vic Syracuse
Built RV-4, RV-6, 2-RV-10's, RV-7A, RV-8, Prescott Pusher, Kitfox Model II, Kitfox Speedster, Kitfox 7 Super Sport, Just Superstol, DAR, A&P/IA, EAA Tech Counselor/Flight Advisor, CFII-ASMEL/ASES
Kitplanes "Unairworthy" monthly feature
EAA Sport Aviation "Checkpoints" column
EAA Homebuilt Council Chair/member EAA BOD
Author "Pre-Buy Guide for Amateur-Built Aircraft"
www.Baselegaviation.com
|
12-24-2017, 04:42 PM
|
|
|
|
Join Date: Dec 2011
Location: Livermore, CA
Posts: 6,767
|
|
Quote:
Originally Posted by Jesse
You cannot share an antenna, but the G430 can output a position source to both other items via RS232. Also, the G5 has a built-in antenna that is usually adequate.
|
Since he said the 430 is non-WAAS, I think it cannot serve as an adsb position source.
I?m going to reverse myself. Since the 430 installation instructions call for a certain minimum and maximum cable loss, I think a splitter is okay as long as you stay within the specs, AND make sure the dc power gets to the antenna okay and does not cause problems with other receivers. |
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
All times are GMT -6. The time now is 09:20 PM.
|
Linear Mode
