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  #1  
Old 08-25-2005, 11:37 AM
Rick_Aronow Rick_Aronow is offline
 
Join Date: May 2005
Location: Austin,TX
Posts: 4
Question VOR/LOC/GS antenna

Looking for recommendations on brand & model and mounting of vor/loc/gs antenna for a -7A. Van's has a couple of different Commant & Rami that they sell. What are the pro/cons of the various models? My preference is to do a traditional mount in the VS, but I'm not sure how they would mount. I've got my VS complete, except for the tip.
Also, since VOR & LOC operate in the same frequency range wouldn't any VOR antenna also be a LOC antenna? Some antennas are listed as VOR/GS while others are VOR/LOC/GS.
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  #2  
Old 08-25-2005, 12:09 PM
SteinAir SteinAir is offline
 
Join Date: Feb 2005
Location: Minneapolis
Posts: 2,474
Default

Put an Archer Wintip Antenna in and be done with it! No draggy antennas to deal with!

cheers,
Stein.
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  #3  
Old 08-25-2005, 12:56 PM
ddurakovich ddurakovich is offline
 
Join Date: Jan 2005
Location: Coshocton, Ohio
Posts: 315
Default

VOR/LOC are same frequency. GS is a different frequency, but a harmonic of the VOR, so one antenna (with an appropriate splitter to feed the GS receiver) works just fine. Like Stein said, Archer in the wingtip and you're done.

IF you need a Marker Beacon antenna, about 40" of copper foil tape in the wingtip will suffice for that also. You will need another run of coax though.
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CFIG, AGI, COMM SEL, VAF# 133
RV-4, N666PR, Finished (Well, at least flying)!
RV-6 - Adopted an orphan!
Detroit, MI

"If you think you can do a thing or think you can't do a thing, you're right."
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  #4  
Old 08-26-2005, 06:53 AM
n250jg n250jg is offline
 
Join Date: Jan 2005
Location: Amarillo, TX
Posts: 78
Default

Hi Rick,

If you go with the "cat whiskers" antenna you can easily mount it on the fuse below the HS. I didn't like the look of the antenna high on the VS, plus this location protects the antenna from people walking around the tail (and vice versa). You will need to reinforce the skin (as with almost any external antenna) with a doubler plate. We just installed nutplates on the doubler and then riveted the doubler to the skin. Very easy to install the antenna now since you only need to access the back side to connect the coax, and you can do that from the inspection holes. Like Dave said, just use a splitter (I might have an extra one at home I'll sell for a bargain) to use this antenna for your VOR/LOC/GS.



From Rosie: Be careful the antenna does NOT flex enough to touch the fuselage. I had to shim mine with the UHMW strip leftover from the canopy.
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N250JG RV-8A (#81185)
"Object of Desire"
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Last edited by n250jg : 10-05-2006 at 07:08 AM. Reason: new domain
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  #5  
Old 08-26-2005, 11:42 AM
Bob Axsom Bob Axsom is offline
 
Join Date: Mar 2005
Posts: 5,685
Default Mine's on top

Putting the rabbit ears on top of the vertical stabilizer enables you to fair in all but the outer rounded edges of the central hockey puck and retains the reception environment proven in certified IFR aircraft. When I was at the antenna selection stage I called the fellow in Florissant, Missouri that was marketing some good looking wing tip antennas. When I told him that I intended to use the airplane for IFR flying he said to me "My antennas are intended for sport flying and they work very well for that but if you are going to fly serious IFR I recommend that you install the best quality no compromise standard antennas and install them outside the aircraft with proper orientation, separation and location." I did and I have experienced no nav/com problems to date. You should consider you personal operational plans in making your final decisions. If you are planning strictly VFR that enables some drag reduction by enclosing the antennas. Personnally, I decided nav/com is one area I want no performance compromises in and I chose the conservative direction.

Bob Axsom

Last edited by Bob Axsom : 08-26-2005 at 07:44 PM.
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  #6  
Old 08-26-2005, 10:22 PM
Rick_Aronow Rick_Aronow is offline
 
Join Date: May 2005
Location: Austin,TX
Posts: 4
Default Top mount

Bob, my first inclination is to take the conservative approach with a top mount, but I must say bottom mount looks interesting. Did you mount the antenna base on the top VS rib? It's too late for me to put in nut plates, how is your's attached? For those of you using the wing tip antenna's, how do you rate their performance? It sound like at least 2 people like them?
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  #7  
Old 08-27-2005, 05:58 AM
Ben Beaird Ben Beaird is offline
 
Join Date: Jan 2005
Location: Plymouth, WI
Posts: 65
Default

Rick,

I have Archer's Com2, Nav/LOC/GS and Marker Beacon antennae in my -6A wingtips. Nav in the left, Com & MB in the right.

They all work well. The Nav & Com do not have the range and clarity of a good external antenna but the LOC and MB have been adequate for the approaches that I've flown.

Ben
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  #8  
Old 08-27-2005, 04:39 PM
Bob Axsom Bob Axsom is offline
 
Join Date: Mar 2005
Posts: 5,685
Default Here is my top mount

I made a little stand-off mount with platenuts for the antenna and pop rivited it the the top rib. Then the antenna is mounted on the base plate with screws (#8 or 10 I don't remember what I used). This works well for the old style Vertical stabilizer on the RV-6A. You will have to develop a mount for your particular application but then that's what homebuilding is all about.





Bob Axsom
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  #9  
Old 08-28-2005, 12:30 AM
rv8ch's Avatar
rv8ch rv8ch is offline
 
Join Date: Feb 2005
Location: LSGY
Posts: 3,682
Default signal blocked?

Quote:
Originally Posted by SteinAir
Put an Archer Wintip Antenna in and be done with it! No draggy antennas to deal with.
Won't the airframe block signals from some directions?
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  #10  
Old 06-26-2006, 07:26 AM
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mikehoover mikehoover is offline
 
Join Date: Jan 2005
Posts: 626
Default Securing the coax at the top of the VS

Quote:
Originally Posted by Bob Axsom
I made a little stand-off mount with platenuts for the antenna and pop rivited it the the top rib.

Bob Axsom
Bob, How did you secure the cable at/near the top of the VS? Or is the BNC connection suitable?

Thanks!

Mike
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Columbia, SC
www.aclog.com/rv-9a/
www.eaa242.org/
N194MH first flight on 08-26-12

Last edited by mikehoover : 06-26-2006 at 07:38 AM. Reason: To correct syntax.
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