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Comm antenna placement

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woxofswa

Joined: 12 Aug 2008
Posts: 349
Location: AZ

Posted: Fri Nov 25, 2011 7:55 pm Post subject: Comm antenna placement

For logistical reasons I would love to run my two comm antennae under the center box basically between the gear legs 36" apart.  Anyone had any issues with a similar installation?



Thanks in advance.

_________________
Myron Nelson
Mesa, AZ
Flew May 10 2014

Kelly McMullen

Joined: 16 Apr 2008
Posts: 1188
Location: Sun Lakes AZ

Posted: Fri Nov 25, 2011 8:23 pm Post subject: Comm antenna placement

I would wonder where you would put your transponder antenna if you put

the com antennas that far forward. You need similar distance spacing

for the transponder antenna. The transponder should have RG400 cable,

while the coms will be fine with RG58, so it would seem cheaper to

make longer runs with RG58 and keep the transponder antenna fairly

close to the instrument panel.

I think most RV-10s I have seen have placed com antenna(s) under rear

seats or baggage compartment.



On Fri, Nov 25, 2011 at 8:55 PM, woxofswa <woxof(at)aol.com> wrote:

 	  Quote: 	
		   



 For logistical reasons I would love to run my two comm antennae under the center box basically between the gear legs 36" apart.  Anyone had any issues with a similar installation?



 Thanks in advance.



 --------

 Myron Nelson

 Mesa, AZ

 Emp completed, QB wings completed, legacy build fuse in mostly done, finishing kit in progress.





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=359274#359274

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

woxofswa

Joined: 12 Aug 2008
Posts: 349
Location: AZ

Posted: Fri Nov 25, 2011 8:44 pm Post subject: Re: Comm antenna placement

The xponder is already in behind the baggage compartment which complicates spacing. Below the rear seats or baggage means ripping up floors which I was hoping to avoid.  I thought of running the antenna aft but it would mean sharing conduit with the SkyView network cable which they don't recommend. The easiest point of access is the open cross section between the gear legs, but my fear is shadowing from the wings on the ground.

_________________
Myron Nelson
Mesa, AZ
Flew May 10 2014

philperry9

Joined: 23 Nov 2011
Posts: 381

Posted: Fri Nov 25, 2011 8:54 pm Post subject: Comm antenna placement

Check out Deems site.  That's what he did and I think he has been happy with the results.  At least he was the last time it was discussed.



Phil

On Nov 25, 2011, at 9:55 PM, "woxofswa" <woxof(at)aol.com> wrote:



 	  Quote: 	
		   

 

 For logistical reasons I would love to run my two comm antennae under the center box basically between the gear legs 36" apart.  Anyone had any issues with a similar installation?

 

 Thanks in advance.

 

 --------

 Myron Nelson

 Mesa, AZ

 Emp completed, QB wings completed, legacy build fuse in mostly done, finishing kit in progress.

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=359274#359274

Kellym

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

Posted: Fri Nov 25, 2011 8:54 pm Post subject: Comm antenna placement

I wouldn't worry about wing shadowing. I have a bent whip in about the 

same location on my Mooney and it works fine on ground and in air. I 

suppose it might be possible, but you normally aren't needing a range 

much over 5 miles for ground transmissions.



On 11/25/2011 9:44 PM, woxofswa wrote:

 	  Quote: 	
		   



 The xponder is already in behind the baggage compartment which complicates spacing. Below the rear seats or baggage means ripping up floors which I was hoping to avoid.  I thought of running the antenna aft but it would mean sharing conduit with the SkyView network cable which they don't recommend. The easiest point of access is the open cross section between the gear legs, but my fear is shadowing from the wings on the ground.



 --------

 Myron Nelson

 Mesa, AZ

 Emp completed, QB wings completed, legacy build fuse in mostly done, finishing kit in progress.





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=359283#359283

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

AirMike

Joined: 27 Feb 2007
Posts: 514
Location: Nevada

Posted: Sat Nov 26, 2011 2:42 am Post subject: Comm antenna placement

I put mine on top of the fuselage - about two feet aft of the point where the fiberglass cabin top meets the aluminum. Works well. VOR nav is under the horizontal stabilizer? Also works well. I would have preferred the nav on top of the vertical stabilizer, but did not pre-plan well enough.

_________________
See you OSH '18
Q/B - sold.

flysrv10(at)gmail.com
Guest

Posted: Sat Nov 26, 2011 3:07 am Post subject: Comm antenna placement

Mine is located under the Front seats and the transponder ahead near the firewall. No issues. 



Let me know if you need dimension. 



Rob Kermanj

Sent from my iPhone



On Nov 25, 2011, at 10:55 PM, "woxofswa" <woxof(at)aol.com> wrote:



 	  Quote: 	
		   

 

 For logistical reasons I would love to run my two comm antennae under the center box basically between the gear legs 36" apart.  Anyone had any issues with a similar installation?

 

 Thanks in advance.

 

 --------

 Myron Nelson

 Mesa, AZ

 Emp completed, QB wings completed, legacy build fuse in mostly done, finishing kit in progress.

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=359274#359274

jesse(at)saintaviation.co
Guest

Posted: Sat Nov 26, 2011 4:07 am Post subject: Comm antenna placement

I really like having the Comm antennas below the front seats, as far apart as possible, and I put the transponder antenna as far forward as I can get it at the bottom of the tunnel. I've never had any problems with this arrangement.



Jesse Saint

Saint Aviation, Inc.

jesse(at)saintaviation.com

C: 352-427-0285

F: 815-377-3694



On Nov 25, 2011, at 10:55 PM, woxofswa wrote:



 	  Quote: 	
		   

 

 For logistical reasons I would love to run my two comm antennae under the center box basically between the gear legs 36" apart.  Anyone had any issues with a similar installation?

 

 Thanks in advance.

 

 --------

 Myron Nelson

 Mesa, AZ

 Emp completed, QB wings completed, legacy build fuse in mostly done, finishing kit in progress.

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=359274#359274

n223rv(at)wolflakeairport
Guest

Posted: Sat Nov 26, 2011 4:39 am Post subject: Comm antenna placement

That is exactly what I have don

Sent from my iPhone

On Nov 26, 2011, at 7:04 AM, Jesse Saint <jesse(at)saintaviation.com> wrote:

 	  Quote: 	

 I really like having the Comm antennas below the front seats, as far apart as possible, and I put the transponder antenna as far forward as I can get it at the bottom of the tunnel. I've never had any problems with this arrangement.

 Jesse Saint

 Saint Aviation, Inc.

 jesse(at)saintaviation.com

 C: 352-427-0285

 F: 815-377-3694

 On Nov 25, 2011, at 10:55 PM, woxofswa wrote:

> 

> 

> For logistical reasons I would love to run my two comm antennae under the center box basically between the gear legs 36" apart.  Anyone had any issues with a similar installation?

> 

> Thanks in advance.

> 

> --------

> Myron Nelson

> Mesa, AZ

> Emp completed, QB wings completed, legacy build fuse in mostly done, finishing kit in progress.

> 

> 

> 

> 

> Read this topic online here:

> 

> http://forums.matronics.com/viewtopic.php?p=359274#359274

> 

> 

> 

> 

> 

> 

> 

> 

> 

>

n223rv(at)wolflakeairport
Guest

Posted: Sat Nov 26, 2011 4:40 am Post subject: Comm antenna placement

That is exactly what I have done.  And added a second transponder type antenna farther back on the centerline under the flap mech area for traffic.

No issues after 65 hours. 

-Mike Kraus

Sent from my iPhone

On Nov 26, 2011, at 7:04 AM, Jesse Saint <jesse(at)saintaviation.com> wrote:

 	  Quote: 	

 I really like having the Comm antennas below the front seats, as far apart as possible, and I put the transponder antenna as far forward as I can get it at the bottom of the tunnel. I've never had any problems with this arrangement.

 Jesse Saint

 Saint Aviation, Inc.

 jesse(at)saintaviation.com

 C: 352-427-0285

 F: 815-377-3694

 On Nov 25, 2011, at 10:55 PM, woxofswa wrote:

> 

> 

> For logistical reasons I would love to run my two comm antennae under the center box basically between the gear legs 36" apart.  Anyone had any issues with a similar installation?

> 

> Thanks in advance.

> 

> --------

> Myron Nelson

> Mesa, AZ

> Emp completed, QB wings completed, legacy build fuse in mostly done, finishing kit in progress.

> 

> 

> 

> 

> Read this topic online here:

> 

> http://forums.matronics.com/viewtopic.php?p=359274#359274

> 

> 

> 

> 

> 

> 

> 

> 

> 

>

rv10flyer

Joined: 25 Aug 2009
Posts: 364

Posted: Sat Nov 26, 2011 7:13 am Post subject: Re: Comm antenna placement

On mine: Xpdr 10" aft of fw in tunnel, com 1 in tunnel between rear seats, com 2 above rear seats with 22" ground plane bonded to interior of cabin top. My optional location for com was going to be under seat area closest to tunnel. You could have all three on bottom close to center and have access to them if you wanted. I will see how they work in a week or so.

_________________
Wayne G.

bcondrey

Joined: 03 Apr 2006
Posts: 580

Posted: Sat Nov 26, 2011 8:02 am Post subject: Re: Comm antenna placement

My first RV-10 had a pair of Comant bent whips below the rear seats, just aft of the rear spar carry-through.  I put a couple of small access panels on the rear seat bottoms so it was easy to get to.  I installed a doubler and nutplates while building the plane but with small access panels in the seat bottoms you could easily just use locknuts.



This location, or something very close is used by a LOT of RV-10s that I've seen.  It works well 99% of the time.  The remaining 1% that sometimes is an issue is when trying to contact remote comm sites (like clearance delivery from a non-towered field) when sitting on the ground.  I've also heard of others having issue at large towered fields when trying to talk to either clearance delivery or ground controllers.  Comm in the air was always excellent.  



This time (my second -10) I decided to mount one comm in that same location and one on top of the cabin.



my .02 FWIW.



Bob

Strasnuts

Joined: 10 Feb 2009
Posts: 502
Location: Salt Lake City, UT

Posted: Sat Nov 26, 2011 9:16 am Post subject: Comm antenna placement

I would have liked one top comm and one bottom comm.  By the time I 

installed all my antennas I had to put both on the bottom.  I haven't had a 

problem yet in the RV-10 but I have in larger planes.  In fact we use comm 2 

on the ground so we know ground/clearance will have an easier time hearing 

us.  I agree with Bob, if you can have both top and bottom positions you are 

better off

---

_________________
40936
RV-10 SB N801VR Flying
780 Hours
SuperSTOL 60 hours

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