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glideslope antenna was lower OM minima

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rv8iator

Joined: 11 Apr 2006
Posts: 145
Location: Newberg, OR

Posted: Sun Mar 22, 2009 10:27 am Post subject: glideslope antenna was lower OM minima

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Now that we have settled the marker beacon issue...
	


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What are the options for locating a glideslope antenna on an RV-8?
	


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I am building my panel and suddenly had an OH ---- moment.  I completely forgot the GS antenna.  My vert stab/rudder are complete so I am curious as to if anyone has figured out another location for placing the dipole whisker antenna for the GS receiver?  I looked at the dipole strip antenna but it requires a flat composite surface 40" deep perpendicular to the longitudinal axis of the aircraft.  So that seem to rule out the wingtip.
	


I had a suggestion from my local avionics shop to mount  a dipole whisker ant.  under the horz. stab.  This appears to be difficult at best.  What would be the effect on  the antenna reception being two inches below a large ground plane?

I am really trying to avoid tearing of the fiberglass tip on the vert. stab. to mount a dipole whisker.  It's also unsightly!  

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plan the build... build the plan.  Except when the old brain misfires.
	


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Chris Stone
	


RV-8 (eventually)

Newberg OR.

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Well, Old Bob, I guess the story is to keep the Marker Beacon receiver off the panel. I asked one question and got a different answer. However, your input is much appreciated. I guess I won't miss the receiver and it will simplify my panel. (However, you are right that it was pleasant hearing the signal when you overflew the airports.) Good Bye KR22.

--Jose





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_________________
C. Stone (RV8iator)

rhdudley1(at)bellsouth.ne
Guest

Posted: Sun Mar 22, 2009 11:10 am Post subject: glideslope antenna was lower OM minima

Hi Chris,



One of your options is to use a splitter (coupler) dividing the VOR/LOC and 

the GS signals, avoiding the need for an additional antenna. Some of the 

NAV/COMS (like the SL-30) do this internally. However, the Garmin 430 and 

possibly others have separate antenna inputs for LOC and GS. Splitters are 

available from many sources, like Spruce and Chief to do this.



Hope this helps.



Richard Dudley

-6A sold

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BobsV35B(at)aol.com
Guest

Posted: Sun Mar 22, 2009 3:31 pm Post subject: glideslope antenna was lower OM minima

Good Afternoon Chris,

  

 My vote would be to use a splitter on the nav antenna. For about the last  thirty years, we have been splitting the signal four ways to feed two VORs  and two glide path receivers. 

  

 Modern radios are so good that all systems get plenty of signal. 

  

 As far as redundancy is concerned, if the antenna does fail, you still have  GPS to figure out where you are. If you have one that can process WAAS signals,  you can shoot the LPV approaches and there are now more of them than there are  ILS approaches.

  

 For a VHF nav antenna, I vote for a set of blades.  Potential of a  failure with modern blades is practically nil!

  

 Happy  Skies



Old Bob

AKA

Bob Siegfried

Ancient Aviator

628 West 86th  Street

Downers Grove, IL 60516

630 985-8502 

Stearman  N3977A

Brookeridge Air Park LL22   

  In a message dated 3/22/2009 1:29:35 P.M. Central Daylight Time,  rv8iator(at)earthlink.net writes:

  	  Quote: 	
		  What are    the options for locating a glideslope antenna on an  RV-8?

	




 A Good Credit Score is 700 or Above.  See yours in just 2 easy steps!

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toaster73(at)embarqmail.c
Guest

Posted: Tue Mar 24, 2009 3:22 pm Post subject: glideslope antenna was lower OM minima

Might look at a Comant CE193, It can mount on the windscreen center post (if 

you have one).  I am going to try it on my RV-10. It was a salvage item for 

$38.

-Chris Lucas

RV-10, #40072



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nuckolls.bob(at)aeroelect
Guest

Posted: Wed Mar 25, 2009 9:10 am Post subject: glideslope antenna was lower OM minima

At 06:21 PM 3/24/2009, you wrote:

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Might look at a Comant CE193, It can mount on the windscreen center 

post (if you have one).  I am going to try it on my RV-10. It was a 

salvage item for $38.

-Chris Lucas

RV-10, #40072


	


   Before you hang whiskers on your airplane for

   the GS receiver, try a coupler. Keep in mind that

   ILS signals are beamed off the approach end of

   the runway, only have to be functional for

   perhaps 10 miles max and are VERY strong.



   A VOR/LOC antenna is an odd harmonic relationship

   with GS frequencies which makes it fairly efficient

   for both services.



   I'm 99% sure you'll find a single-antenna,

   coupler-feed pair of ILS receivers quite

   satisfactory.

        Bob . . .



        ----------------------------------------)

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

        ----------------------------------------

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