usafhaynes1 Posted April 29, 2013 Report Posted April 29, 2013 http://mooneyspace.com/gallery/image/34054-m20c/ Can anyone tell me what this tube protruding out of the bottom of my plane is? I've researched antenna's and have come up empty. Quote
Marauder Posted April 29, 2013 Report Posted April 29, 2013 It looks like a Com antennae. I have one for my 650 that looks about the same. Quote
kerry Posted April 29, 2013 Report Posted April 29, 2013 It looks like a ADF antenna. I took mine off and replaced it with a 2nd transponder antenna for a traffic advoidance device. Quote
usafhaynes1 Posted April 29, 2013 Author Report Posted April 29, 2013 I do have an ADF wire antenna on top that I'm about to remove since the airplane no longer has an ADF. Can anyone confirm it's the second part of the ADF antenna? I have two solid com antenna's, gps antenna, elt antenna on top. transponder antenna on bottom and this monstrosity. I do have a LORAN that is inop and not sure which antenna it's connected to. I'll be removing the LORAN when I'm ready to install a DME. Quote
BigTex Posted April 29, 2013 Report Posted April 29, 2013 It might be the drain tube for the overhead vent. Quote
kerry Posted April 29, 2013 Report Posted April 29, 2013 Sorry, I think it's a marker beacon antenna. 1 Quote
OR75 Posted April 29, 2013 Report Posted April 29, 2013 it is a Loran antenna looks very similar to a CI-122 Loran antenna Best way to confirm is when you remove it, the part number will be writen somewhere near the coax connector. Quote
Piloto Posted April 29, 2013 Report Posted April 29, 2013 Sorry, I think it's a marker beacon antenna. I agree, it is an old marker beacon antenna for 75MHz. New ones look like a small boat. José Quote
Marauder Posted April 29, 2013 Report Posted April 29, 2013 Until we get a better picture, I think it is a really thin rudder! Quote
usafhaynes1 Posted April 29, 2013 Author Report Posted April 29, 2013 Understood...my plane is in mx hangar until tomorrow (waiting 72 hours for glue to dry on a newly installed fuel sump that was leaking, they basically resealed left tank after install). As soon as I have access, I will take better pictures and post them for an accurate assessment. My hope is that I can remove the object if it's from the Loran. Quote
OR75 Posted April 29, 2013 Report Posted April 29, 2013 Sorry, I think it's a marker beacon antenna. i believe you are right Quote
Jerry 5TJ Posted May 1, 2013 Report Posted May 1, 2013 Yes, it is a 75 MHz Marker Beacon receiver antenna. To verify: Measure the length starting from the forward end at the fuselage, around the bend and to the back of the horizontal element. It will be about a quarter wavelength at 75 MHz, which happens to be exactly one meter in free space. In English terms, about 39 inches. The smaller boat-hull shaped Marker Beacon antennas are more common now. Search Ebay and you'll find a bunch of 'em. Here's a picture of the old style antenna without the airplane: Quote
Marauder Posted May 1, 2013 Report Posted May 1, 2013 That is a marker beacon for sure. Did you replace it? I know they are decommisioning them but many still out there. Quote
usafhaynes1 Posted May 2, 2013 Author Report Posted May 2, 2013 It's still on the plane. What can I replace it with? Quote
jetdriven Posted May 2, 2013 Report Posted May 2, 2013 You can replace it with a Comant CI-102 like we did last week. 140$ from Aircraft Spruce. Enjoy the extra knot of cruise speed. http://www.aircraftspruce.com/pages/av/antenna_markerbeacon/comant102.php Quote
usafhaynes1 Posted May 2, 2013 Author Report Posted May 2, 2013 You can replace it with a Comant CI-102 like we did last week. 140$ from Aircraft Spruce. Enjoy the extra knot of cruise speed. http://www.aircraftspruce.com/pages/av/antenna_markerbeacon/comant102.php Thanks!!! I'll put it on my growing list of "upgrades"! Quote
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