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robin1(at)mrmoisture.com
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 Posted: Fri Dec 15, 2006 11:52 pm Post subject: Share GPS Antenna |
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RV Guru's,
Is there a way to share / split a GPS antenna between a Garmin 396 & Garmin XL250? I have the exterior mounted XL250 antenna and I think it would be a cleaner installation if both units could share the same feed.
Robin
RV-4 Sold
RV-6A 330 Hours
RV-10 Parts
[quote][b]
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Tim(at)MyRV10.com
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| Posted: Sat Dec 16, 2006 4:08 am Post subject: Share GPS Antenna |
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Almost certainly not possible to split a GPS Antenna.
Tim Olson - RV-10 N104CD - Flying
do not archive
Robin Marks wrote:
| Quote: | *RV Guru's,*
*Is there a way to share / split a GPS antenna between a Garmin 396 &
Garmin XL250? I have the exterior mounted XL250 antenna and I think it
would be a cleaner installation if both units could share the same feed.*
**
*Robin*
*RV-4 Sold*
*RV-6A 330 Hours*
*RV-10 Parts*
|
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GRANSCOTT(at)aol.com
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| Posted: Sat Dec 16, 2006 5:34 am Post subject: Share GPS Antenna |
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I have an IFR certified GPS in our spam can and during a recent visit to our avionic shop asked if they could create a "split" for me for my Garmin portable...the response was interesting:
1. It not legal to split the cable to a hand held unit
2. It won't work well anyway
3. Using a handheld unit only to shoot an approach without a legal IFR certified GPS on board is illegal...and the certified unit must be currently checked with a current data base to make a legal/loggable approach.
One can build an approach using the handheld but that's illegal and really stupid besides as the unit may not have the approach integrity. It's certainly good to have a back up system incase your primary system fails but using handheld equipment as primary and secondary is not a smart thing to do IMHO. Like the unit that bridges a portable GPS to your autopilot--seems OK but certainly not a legal connection for IFR.
If one looks at good avionic IFR systems today...one finds that people are building panels with multi IFR certified GPS's...ala a duel Garmin GPS's 530/430 or 430/430--530/530 or 480/480 systems. One cannot use a handheld as your backup GPS only as awareness and as an emergency unit. Plus a good system may have an VOR/EHSI to perform as a back up and primary. I did not ask if it was legal to put your handheld in serial with a certified IFR GPS unit but I'd suspect that it's not legal to do this whether the aircraft is an experimental or certified.
Patrick
do not archive
[quote][b]
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n8vim(at)arrl.net
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| Posted: Sat Dec 16, 2006 5:41 am Post subject: Share GPS Antenna |
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It certainly is possible, but I don't know of any "off the shelf" solutions.
What you would need to do is provide:
1. A splitter to compensate for the changed impedance of the line
(Think CATV 'splitters')
2. An inline capacitor of the correct value (I would have to do the
calculations) on one line to block the DC feed to the antenna (The
antenna is powered by a DC feed; The RF signal passes through the capacitor)
-Jim 40384 (I am an RF Engineer.. Working on Bottom Wing Skins)
Robin Marks wrote:
| Quote: | *RV Guru's,*
*Is there a way to share / split a GPS antenna between a Garmin 396 &
Garmin XL250? I have the exterior mounted XL250 antenna and I think it
would be a cleaner installation if both units could share the same feed.*
**
*Robin*
*RV-4 Sold*
*RV-6A 330 Hours*
*RV-10 Parts*
*
*
|
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wcurtis(at)core.com
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| Posted: Sat Dec 16, 2006 6:34 am Post subject: Share GPS Antenna |
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[quote]I did not ask if it was legal to put your handheld in serial with >a certified IFR GPS unit but I'd suspect that it's not legal to do this >whether the aircraft is an experimental or certified. This IS legal and approved by Garmin and the FAA (at least the Allentown FSDO) and is probably why when this is done, the connection is ONE way from the panel unit to the portable. That is, the panel unit can send info to the portable, but the portable is NOT allowed to talk to the panel unit. I have this configuration (GNS-430 to GPSMAP 195) in my certified Cardinal and will do the same in the RV-10. William Curtis http://wcurtis.nerv10.com/ [quote][b]
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