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NAV splitter

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rvdave

Joined: 24 Jan 2009
Posts: 191

Posted: Sat May 30, 2015 10:31 am Post subject: NAV splitter

The quick build kit I have, the previous builder installed two Archer NAV antennae one in each wingtip   I'm assuming I can combine  these signals using a combiner or reverse splitter .  Will I be fighting a ghosting/corrupting signal using two signal sources?

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Dave Ford
Cadillac, MI

Bob Turner

Joined: 03 Jan 2009
Posts: 885
Location: Castro Valley, CA

Posted: Sat May 30, 2015 10:45 am Post subject: Re: NAV splitter

This absolutely does not work.

You will make a directional antenna which works very well in some directions and very poorly in others. Which direction depends on the exact lengths of the coax.

One Archer works just fine, with some reduction in sensitivity when looking thru the airframe direction.

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Bob Turner
RV-10 QB

carl.froehlich(at)verizon
Guest

Posted: Sat May 30, 2015 11:37 am Post subject: NAV splitter

Nope - will not work.  The impedance match will be all wrong.



Use one antenna for NAV, keep the other antenna as a backup comm - say for a handheld.  It would work a boat load better than the handheld's rubber ducky antenna.



I made this antenna out of same scrap aluminum and small pieces of fiberglass.  I used an antenna tester to tune (most of these antennas are so far out that just slapping one in tends to produce disappointing results).  100nmi plus VOR range at altitude. 



Carl



 	  Quote: 	
		   On May 30, 2015, at 2:45 PM, Bob Turner <bobturner(at)alum.rpi.edu> wrote:

 

 

 

 This absolutely does not work.

 You will make a directional antenna which works very well in some directions and very poorly in others. Which direction depends on the exact lengths of the coax.

 One Archer works just fine, with some reduction in sensitivity when looking thru the airframe direction.

 

 --------

 Bob Turner

 RV-10 QB

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=442814#442814

 

 

 

The quick build kit I have, the previous builder installed two Archer NAV antennae one in each wingtip   I'm assuming I can combine  these signals using a combiner or reverse splitter .  Will I be fighting a ghosting/corrupting signal using two signal sources?
	




--------

Dave Ford

RV6 for sale

RV10 building

Cadillac, MI

 	  Quote:

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jesse(at)saintaviation.co
Guest

Posted: Sat May 30, 2015 11:43 am Post subject: NAV splitter

You can use one to Fe achieve Nav radio if you have two, but you don't want to try to combine them. 



Jesse Saint

Saint Aviation, Inc.

352-427-0285

jesse(at)saintaviation.com



Sent from my iPad



 	  Quote: 	
		   On May 30, 2015, at 1:31 PM, rvdave <rv610dave(at)gmail.com> wrote:

 

 

 

 The quick build kit I have, the previous builder installed two Archer NAV antennae one in each wingtip   I'm assuming I can combine  these signals using a combiner or reverse splitter .  Will I be fighting a ghosting/corrupting signal using two signal sources?

 

 --------

 Dave Ford

 RV6 for sale

 RV10 building

 Cadillac, MI

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=442813#442813

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rvdave

Joined: 24 Jan 2009
Posts: 191

Posted: Sat May 30, 2015 11:53 am Post subject: Re: NAV splitter

Exactly what I need to know, thanks.

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Dave Ford
Cadillac, MI

Kellym

Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ

Posted: Sat May 30, 2015 1:02 pm Post subject: NAV splitter

I have installed two, because I have two nav/coms. If you only have one, 

perhaps with an ILS, you could use the second one for the GS. As others 

have said, you can't combine, and if you split for GS or second nav you 

lose about 50% of the signal strength.



On 5/30/2015 12:53 PM, rvdave wrote:

 	  Quote: 	
		   



 Exactly what I need to know, thanks.



 --------

 Dave Ford

 RV6 for sale

 RV10 building

 Cadillac, MI





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=442818#442818

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Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD

Bob Turner

Joined: 03 Jan 2009
Posts: 885
Location: Castro Valley, CA

Posted: Sat May 30, 2015 1:03 pm Post subject: Re: NAV splitter

If your nav radio has separate inputs for vor and GS you can hook up one antenna to each and save tbe cost of a splitter.

If you want to use it for a com radio you'll want to bend it up as much as possible, and trim about 10% of the length off the end. It won't be great but as Carl said it's better than the rubber duckie.

For techies: the impedance match is fine, the issue is that depending on the direction of the signal, there will be phase mis-matches. When the phase difference is 180 degrees you'll get no signal.

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Bob Turner
RV-10 QB

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