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Comm Antennas

 
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kearney



Joined: 20 Sep 2008
Posts: 563

PostPosted: Sat Jun 05, 2010 4:06 pm    Post subject: Comm Antennas Reply with quote

Hi

I am planning on installing two Comant CI-122 antennas tomorrow. My plan is to fab doublers and install the antennas / doublers just aft and inboard of the fuse steps. My reason for this is I have inspection panels in that area for the steps so it seems like a good choice. I am not keen on installing anything where access is a problem.

Can anyone thing of reasons to not do what I plan? Are there better options for these antennas?

Cheers

Les
#40643

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Kelly McMullen



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

PostPosted: Sat Jun 05, 2010 6:00 pm    Post subject: Comm Antennas Reply with quote

Les,
That might be a good location for one antenna. Putting two antennas within about 2 ft of each other is not good.
I'd consider either mounting one near an access panel on underside of wing or far enough back in the tail cone to have more than 3 ft separation between antennas.  Alternatives include a Bob Archer wingtip Com antenna, an antenna on the top of the fuselage. The more separation you can get, the better. Of course you also need to consider separation from your ELT antenna and from GPS antenna.

On Sat, Jun 5, 2010 at 5:04 PM, Les Kearney <kearney(at)shaw.ca (kearney(at)shaw.ca)> wrote:
[quote] Hi
 
I am planning on installing two Comant CI-122 antennas tomorrow. My plan is to fab doublers and install the antennas / doublers just aft and inboard of the fuse steps. My reason for this is I have inspection panels in that area for the steps so it seems like a good choice. I am not keen on installing anything where access is a problem.
 
Can anyone thing of reasons to not do what I plan? Are there better options for these antennas?
 
Cheers
 
Les
#40643
 
Quote:


get="_blank">http://www.matronics.com/Navigator?RV10-List
tp://forums.matronics.com
_blank">http://www.matronics.com/contribution


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Kelly McMullen
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KCHD
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kearney



Joined: 20 Sep 2008
Posts: 563

PostPosted: Sat Jun 05, 2010 8:05 pm    Post subject: Comm Antennas Reply with quote

Kelley

Is 3 ft the magic number? If so, I might be okay. I'll measure tomorrow.

Cheers

Les

From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Kelly McMullen
Sent: June-05-10 7:59 PM
To: rv10-list(at)matronics.com
Subject: Re: Comm Antennas

Les,
That might be a good location for one antenna. Putting two antennas within about 2 ft of each other is not good.
I'd consider either mounting one near an access panel on underside of wing or far enough back in the tail cone to have more than 3 ft separation between antennas. Alternatives include a Bob Archer wingtip Com antenna, an antenna on the top of the fuselage. The more separation you can get, the better. Of course you also need to consider separation from your ELT antenna and from GPS antenna.

On Sat, Jun 5, 2010 at 5:04 PM, Les Kearney <kearney(at)shaw.ca (kearney(at)shaw.ca)> wrote:
[quote] Hi

I am planning on installing two Comant CI-122 antennas tomorrow. My plan is to fab doublers and install the antennas / doublers just aft and inboard of the fuse steps. My reason for this is I have inspection panels in that area for the steps so it seems like a good choice. I am not keen on installing anything where access is a problem.

Can anyone thing of reasons to not do what I plan? Are there better options for these antennas?

Cheers

Les
#40643

Quote:


get="_blank">http://www.matronics.com/Navigator?RV10-List
tp://forums.matronics.com
_blank">http://www.matronics.com/contribution




href="http://www.matronics.com/Navigator?RV10-List">http://www.matronics.com/Navigator?RV10-List
href="http://forums.matronics.com">http://forums.matronics.com
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Phil.Perry(at)netapp.com
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PostPosted: Sat Jun 05, 2010 8:31 pm    Post subject: Comm Antennas Reply with quote

This is exactly the place where Deems installed his CI-122’s.

Flip through the folder:
http://www.deemsrv10.com/album/Sec%2033%20Baggage%20Area/index.html

Perhaps he can give a report.

Phil




From: Les Kearney [mailto:kearney(at)shaw.ca]
Sent: Saturday, June 05, 2010 11:00 PM
To: rv10-list(at)matronics.com
Subject: RE: Comm Antennas



Kelley

Is 3 ft the magic number? If so, I might be okay. I'll measure tomorrow.

Cheers

Les


From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Kelly McMullen
Sent: June-05-10 7:59 PM
To: rv10-list(at)matronics.com
Subject: Re: Comm Antennas
Les,
That might be a good location for one antenna. Putting two antennas within about 2 ft of each other is not good.
I'd consider either mounting one near an access panel on underside of wing or far enough back in the tail cone to have more than 3 ft separation between antennas. Alternatives include a Bob Archer wingtip Com antenna, an antenna on the top of the fuselage. The more separation you can get, the better. Of course you also need to consider separation from your ELT antenna and from GPS antenna.
On Sat, Jun 5, 2010 at 5:04 PM, Les Kearney <kearney(at)shaw.ca (kearney(at)shaw.ca)> wrote:
Hi



I am planning on installing two Comant CI-122 antennas tomorrow. My plan is to fab doublers and install the antennas / doublers just aft and inboard of the fuse steps. My reason for this is I have inspection panels in that area for the steps so it seems like a good choice. I am not keen on installing anything where access is a problem.



Can anyone thing of reasons to not do what I plan? Are there better options for these antennas?



Cheers



Les

#40643


Quote:
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Kelly McMullen



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

PostPosted: Sun Jun 06, 2010 4:29 am    Post subject: Comm Antennas Reply with quote

I believe if you look carefully, Deems put his antennas under the back seat, not inside of the step mount. That allows more separation. I believe the number generally recommended is 4 ft between antennas, but that is hard to achieve and you probably can get away with a bit less. I can tell you that belly mounted antennas are not going to have stellar performance when on the ground. Whether it is difficulty talking to ground control or a nearby remote outlet for picking up a clearance, there is a benefit from having one antenna more elevated than possible on the belly.  I have one on belly and one on top of fuselage on my Mooney. Not even airborne at altitude does the belly mounted antenna give better reception than the top mounted, and on the ground the belly mounted does lose reception depending on position on the airport.

I think where Les is proposing would be good for one antenna, but I wouldn't want it too close to the steps, and I still don't think it would be desirable to have both there.

On Sat, Jun 5, 2010 at 9:25 PM, Perry, Phil <Phil.Perry(at)netapp.com (Phil.Perry(at)netapp.com)> wrote:
[quote]
This is exactly the place where Deems installed his CI-122’s.
 
Flip through the folder:
http://www.deemsrv10.com/album/Sec%2033%20Baggage%20Area/index.html
 
Perhaps he can give a report.
 
Phil
 
 

 
From: Les Kearney [mailto:kearney(at)shaw.ca (kearney(at)shaw.ca)]
Sent: Saturday, June 05, 2010 11:00 PM
To: rv10-list(at)matronics.com (rv10-list(at)matronics.com)

Subject: RE: Comm Antennas



 
Kelley
 
Is 3 ft the magic number? If so, I might be okay. I'll measure tomorrow.
 
Cheers
 
Les
 

From: owner-rv10-list-server(at)matronics.com (owner-rv10-list-server(at)matronics.com) [mailto:owner-rv10-list-server(at)matronics.com (owner-rv10-list-server(at)matronics.com)] On Behalf Of Kelly McMullen
Sent: June-05-10 7:59 PM
To: rv10-list(at)matronics.com (rv10-list(at)matronics.com)
Subject: Re: Comm Antennas
Les,
That might be a good location for one antenna. Putting two antennas within about 2 ft of each other is not good.
I'd consider either mounting one near an access panel on underside of wing or far enough back in the tail cone to have more than 3 ft separation between antennas.  Alternatives include a Bob Archer wingtip Com antenna, an antenna on the top of the fuselage. The more separation you can get, the better. Of course you also need to consider separation from your ELT antenna and from GPS antenna.
On Sat, Jun 5, 2010 at 5:04 PM, Les Kearney <kearney(at)shaw.ca (kearney(at)shaw.ca)> wrote:
Hi

 

I am planning on installing two Comant CI-122 antennas tomorrow. My plan is to fab doublers and install the antennas / doublers just aft and inboard of the fuse steps. My reason for this is I have inspection panels in that area for the steps so it seems like a good choice. I am not keen on installing anything where access is a problem.

 

Can anyone thing of reasons to not do what I plan? Are there better options for these antennas?

 

Cheers

 

Les

#40643

 
Quote:
  get="_blank">http://www.matronics.com/Navigator?RV10-Listtp://forums.matronics.com_blank">http://www.matronics.com/contribution 



 
Quote:
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Kelly McMullen
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KCHD
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Strasnuts



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

PostPosted: Sun Jun 06, 2010 5:35 am    Post subject: Re: Comm Antennas Reply with quote

I agree with Kelly,

I installed one comm on the bottom under the rear seats and I have one going on the top.

I've had numerous occasions in the citation when ground or clearance won't hear me on the bottom antenna and when I switch over to the number two, which is on the top, they have me 5 by 5. After I taxi out to the runway I can switch back to the bottom and speak to tower. The bottom is also better when airborne.


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Phil.Perry(at)netapp.com
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PostPosted: Sun Jun 06, 2010 5:51 am    Post subject: Comm Antennas Reply with quote

Yeah, that’s true Kelly. Deems are a little further forward and that gives a little bit of extra space between them.

I’d still be interested in knowing how it’s working out though.



From: Kelly McMullen [mailto:apilot2(at)gmail.com]
Sent: Sunday, June 06, 2010 7:26 AM
To: rv10-list(at)matronics.com
Subject: Re: Comm Antennas


I believe if you look carefully, Deems put his antennas under the back seat, not inside of the step mount. That allows more separation. I believe the number generally recommended is 4 ft between antennas, but that is hard to achieve and you probably can get away with a bit less. I can tell you that belly mounted antennas are not going to have stellar performance when on the ground. Whether it is difficulty talking to ground control or a nearby remote outlet for picking up a clearance, there is a benefit from having one antenna more elevated than possible on the belly. I have one on belly and one on top of fuselage on my Mooney. Not even airborne at altitude does the belly mounted antenna give better reception than the top mounted, and on the ground the belly mounted does lose reception depending on position on the airport.

I think where Les is proposing would be good for one antenna, but I wouldn't want it too close to the steps, and I still don't think it would be desirable to have both there.
On Sat, Jun 5, 2010 at 9:25 PM, Perry, Phil <Phil.Perry(at)netapp.com (Phil.Perry(at)netapp.com)> wrote:
This is exactly the place where Deems installed his CI-122’s.

Flip through the folder:
http://www.deemsrv10.com/album/Sec%2033%20Baggage%20Area/index.html

Perhaps he can give a report.

Phil




From: Les Kearney [mailto:kearney(at)shaw.ca (kearney(at)shaw.ca)]
Sent: Saturday, June 05, 2010 11:00 PM

To: rv10-list(at)matronics.com (rv10-list(at)matronics.com)

Subject: RE: Comm Antennas



Kelley

Is 3 ft the magic number? If so, I might be okay. I'll measure tomorrow.

Cheers

Les


From: owner-rv10-list-server(at)matronics.com (owner-rv10-list-server(at)matronics.com) [mailto:owner-rv10-list-server(at)matronics.com (owner-rv10-list-server(at)matronics.com)] On Behalf Of Kelly McMullen
Sent: June-05-10 7:59 PM
To: rv10-list(at)matronics.com (rv10-list(at)matronics.com)
Subject: Re: Comm Antennas
Les,
That might be a good location for one antenna. Putting two antennas within about 2 ft of each other is not good.
I'd consider either mounting one near an access panel on underside of wing or far enough back in the tail cone to have more than 3 ft separation between antennas. Alternatives include a Bob Archer wingtip Com antenna, an antenna on the top of the fuselage. The more separation you can get, the better. Of course you also need to consider separation from your ELT antenna and from GPS antenna.
On Sat, Jun 5, 2010 at 5:04 PM, Les Kearney <kearney(at)shaw.ca (kearney(at)shaw.ca)> wrote:
Hi



I am planning on installing two Comant CI-122 antennas tomorrow. My plan is to fab doublers and install the antennas / doublers just aft and inboard of the fuse steps. My reason for this is I have inspection panels in that area for the steps so it seems like a good choice. I am not keen on installing anything where access is a problem.



Can anyone thing of reasons to not do what I plan? Are there better options for these antennas?



Cheers



Les

#40643


Quote:
get="_blank">http://www.matronics.com/Navigator?RV10-Listtp://forums.matronics.com_blank">http://www.matronics.com/contribution



Quote:
href="http://www.matronics.com/Navigator?RV10-List">http://www.matronics.com/Navigator?RV10-Listhref="http://forums.matronics.com">http://forums.matronics.com
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Deems Davis



Joined: 09 Jan 2006
Posts: 925

PostPosted: Sun Jun 06, 2010 6:35 am    Post subject: Comm Antennas Reply with quote

I've not experienced any problems with ground operations. once caveat however, I have not had occasion to contact a remote facility while on the ground.

Deems

On 6/6/2010 6:51 AM, Perry, Phil wrote: [quote] v\:* {behavior:url(#default#VML);} o\:* {behavior:url(#default#VML);} w\:* {behavior:url(#default#VML);} .shape {behavior:url(#default#VML);} <![endif]--> <![endif]--> <![endif]-->
Yeah, that’s true Kelly. Deems are a little further forward and that gives a little bit of extra space between them.

I’d still be interested in knowing how it’s working out though.



From: Kelly McMullen [mailto:apilot2(at)gmail.com (apilot2(at)gmail.com)]
Sent: Sunday, June 06, 2010 7:26 AM
To: rv10-list(at)matronics.com (rv10-list(at)matronics.com)
Subject: Re: Comm Antennas


I believe if you look carefully, Deems put his antennas under the back seat, not inside of the step mount. That allows more separation. I believe the number generally recommended is 4 ft between antennas, but that is hard to achieve and you probably can get away with a bit less. I can tell you that belly mounted antennas are not going to have stellar performance when on the ground. Whether it is difficulty talking to ground control or a nearby remote outlet for picking up a clearance, there is a benefit from having one antenna more elevated than possible on the belly. I have one on belly and one on top of fuselage on my Mooney. Not even airborne at altitude does the belly mounted antenna give better reception than the top mounted, and on the ground the belly mounted does lose reception depending on position on the airport.

I think where Les is proposing would be good for one antenna, but I wouldn't want it too close to the steps, and I still don't think it would be desirable to have both there.
On Sat, Jun 5, 2010 at 9:25 PM, Perry, Phil <Phil.Perry(at)netapp.com (Phil.Perry(at)netapp.com)> wrote:
This is exactly the place where Deems installed his CI-122’s.

Flip through the folder:
http://www.deemsrv10.com/album/Sec%2033%20Baggage%20Area/index.html

Perhaps he can give a report.

Phil




From: Les Kearney [mailto:kearney(at)shaw.ca (kearney(at)shaw.ca)]
Sent: Saturday, June 05, 2010 11:00 PM

To: rv10-list(at)matronics.com (rv10-list(at)matronics.com)

Subject: RE: Comm Antennas



Kelley

Is 3 ft the magic number? If so, I might be okay. I'll measure tomorrow.

Cheers

Les


From: owner-rv10-list-server(at)matronics.com (owner-rv10-list-server(at)matronics.com) [mailto:owner-rv10-list-server(at)matronics.com (owner-rv10-list-server(at)matronics.com)] On Behalf Of Kelly McMullen
Sent: June-05-10 7:59 PM
To: rv10-list(at)matronics.com (rv10-list(at)matronics.com)
Subject: Re: Comm Antennas
Les,
That might be a good location for one antenna. Putting two antennas within about 2 ft of each other is not good.
I'd consider either mounting one near an access panel on underside of wing or far enough back in the tail cone to have more than 3 ft separation between antennas. Alternatives include a Bob Archer wingtip Com antenna, an antenna on the top of the fuselage. The more separation you can get, the better. Of course you also need to consider separation from your ELT antenna and from GPS antenna.
On Sat, Jun 5, 2010 at 5:04 PM, Les Kearney <kearney(at)shaw.ca (kearney(at)shaw.ca)> wrote:
Hi



I am planning on installing two Comant CI-122 antennas tomorrow. My plan is to fab doublers and install the antennas / doublers just aft and inboard of the fuse steps. My reason for this is I have inspection panels in that area for the steps so it seems like a good choice. I am not keen on installing anything where access is a problem.



Can anyone thing of reasons to not do what I plan? Are there better options for these antennas?



Cheers



Les

#40643


Quote:
get="_blank">http://www.matronics.com/Navigator?RV10-Listtp://forums.matronics.com_blank">http://www.matronics.com/contribution



Quote:
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bcondrey



Joined: 03 Apr 2006
Posts: 580

PostPosted: Sun Jun 06, 2010 6:35 am    Post subject: Comm Antennas Reply with quote

I've got mine located wher Deems has his and haven't had an issue in over 2 years of flying that way.
Bob

________________________________
From: owner-rv10-list-server(at)matronics.com <owner-rv10-list-server(at)matronics.com>
To: rv10-list(at)matronics.com <rv10-list(at)matronics.com>
Sent: Sun Jun 06 06:51:08 2010
Subject: RE: RV10-List: Comm Antennas

Yeah, that’s true Kelly. Deems are a little further forward and that gives a little bit of extra space between them.

I’d still be interested in knowing how it’s working out though.

From: Kelly McMullen [mailto:apilot2(at)gmail.com]
Sent: Sunday, June 06, 2010 7:26 AM
To: rv10-list(at)matronics.com
Subject: Re: RV10-List: Comm Antennas

I believe if you look carefully, Deems put his antennas under the back seat, not inside of the step mount. That allows more separation. I believe the number generally recommended is 4 ft between antennas, but that is hard to achieve and you probably can get away with a bit less. I can tell you that belly mounted antennas are not going to have stellar performance when on the ground. Whether it is difficulty talking to ground control or a nearby remote outlet for picking up a clearance, there is a benefit from having one antenna more elevated than possible on the belly. I have one on belly and one on top of fuselage on my Mooney. Not even airborne at altitude does the belly mounted antenna give better reception than the top mounted, and on the ground the belly mounted does lose reception depending on position on the airport.

I think where Les is proposing would be good for one antenna, but I wouldn't want it too close to the steps, and I still don't think it would be desirable to have both there.
On Sat, Jun 5, 2010 at 9:25 PM, Perry, Phil <Phil.Perry(at)netapp.com<mailto:Phil.Perry(at)netapp.com>> wrote:
This is exactly the place where Deems installed his CI-122’s.

Flip through the folder:
http://www.deemsrv10.com/album/Sec%2033%20Baggage%20Area/index.html

Perhaps he can give a report.

Phil

From: Les Kearney [mailto:kearney(at)shaw.ca<mailto:kearney(at)shaw.ca>]
Sent: Saturday, June 05, 2010 11:00 PM

To: rv10-list(at)matronics.com<mailto:rv10-list(at)matronics.com>
Subject: RE: RV10-List: Comm Antennas

Kelley

Is 3 ft the magic number? If so, I might be okay. I'll measure tomorrow.

Cheers

Les

________________________________
From: owner-rv10-list-server(at)matronics.com<mailto:owner-rv10-list-server(at)matronics.com> [mailto:owner-rv10-list-server(at)matronics.com<mailto:owner-rv10-list-server(at)matronics.com>] On Behalf Of Kelly McMullen
Sent: June-05-10 7:59 PM
To: rv10-list(at)matronics.com<mailto:rv10-list(at)matronics.com>
Subject: Re: RV10-List: Comm Antennas
Les,
That might be a good location for one antenna. Putting two antennas within about 2 ft of each other is not good.
I'd consider either mounting one near an access panel on underside of wing or far enough back in the tail cone to have more than 3 ft separation between antennas. Alternatives include a Bob Archer wingtip Com antenna, an antenna on the top of the fuselage. The more separation you can get, the better. Of course you also need to consider separation from your ELT antenna and from GPS antenna.
On Sat, Jun 5, 2010 at 5:04 PM, Les Kearney <kearney(at)shaw.ca<mailto:kearney(at)shaw.ca>> wrote:
Hi

I am planning on installing two Comant CI-122 antennas tomorrow. My plan is to fab doublers and install the antennas / doublers just aft and inboard of the fuse steps. My reason for this is I have inspection panels in that area for the steps so it seems like a good choice. I am not keen on installing anything where access is a problem.

Can anyone thing of reasons to not do what I plan? Are there better options for these antennas?

Cheers

Les
#40643
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rene(at)felker.com
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PostPosted: Sun Jun 06, 2010 6:51 am    Post subject: Comm Antennas Reply with quote

I had mine in the same position, and had a problem communicating with towers on the lower end of the frequency spectrum (118.1 --118.3).  So I moved one of the antennas up to the top and left the other on the bottom.  Have not seen any problems since.

For ref:  Home field, KOGD (Ogden Utah)  Tower 118, never had a problem
Problems encountered:  Boise (KBOI) Tower 118.1
Salt Lake City (KSLC) Tower 118.3

Problems encounter during ground operations all the times except once, they could not hear me one time after I was initially handed off…..at least that is what they said……

Just my experience.  I noticed a .12673 Knot decrease in cruise speed with the antenna change……..just kidding of course.

Rene' Felker
N423CF
801-721-6080


From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Condrey, Bob (US SSA)
Sent: Sunday, June 06, 2010 8:23 AM
To: 'rv10-list(at)matronics.com'
Subject: Re: Comm Antennas



I've got mine located wher Deems has his and haven't had an issue in over 2 years of flying that way.
Bob



From: owner-rv10-list-server(at)matronics.com <owner-rv10-list-server(at)matronics.com>
To: rv10-list(at)matronics.com <rv10-list(at)matronics.com>
Sent: Sun Jun 06 06:51:08 2010
Subject: RE: Comm Antennas

Yeah, that’s true Kelly. Deems are a little further forward and that gives a little bit of extra space between them.

I’d still be interested in knowing how it’s working out though.



From: Kelly McMullen [mailto:apilot2(at)gmail.com]
Sent: Sunday, June 06, 2010 7:26 AM
To: rv10-list(at)matronics.com
Subject: Re: Comm Antennas


I believe if you look carefully, Deems put his antennas under the back seat, not inside of the step mount. That allows more separation. I believe the number generally recommended is 4 ft between antennas, but that is hard to achieve and you probably can get away with a bit less. I can tell you that belly mounted antennas are not going to have stellar performance when on the ground. Whether it is difficulty talking to ground control or a nearby remote outlet for picking up a clearance, there is a benefit from having one antenna more elevated than possible on the belly. I have one on belly and one on top of fuselage on my Mooney. Not even airborne at altitude does the belly mounted antenna give better reception than the top mounted, and on the ground the belly mounted does lose reception depending on position on the airport.

I think where Les is proposing would be good for one antenna, but I wouldn't want it too close to the steps, and I still don't think it would be desirable to have both there.
On Sat, Jun 5, 2010 at 9:25 PM, Perry, Phil <Phil.Perry(at)netapp.com (Phil.Perry(at)netapp.com)> wrote:
This is exactly the place where Deems installed his CI-122’s.

Flip through the folder:
http://www.deemsrv10.com/album/Sec%2033%20Baggage%20Area/index.html

Perhaps he can give a report.

Phil




From: Les Kearney [mailto:kearney(at)shaw.ca (kearney(at)shaw.ca)]
Sent: Saturday, June 05, 2010 11:00 PM

To: rv10-list(at)matronics.com (rv10-list(at)matronics.com)

Subject: RE: Comm Antennas



Kelley

Is 3 ft the magic number? If so, I might be okay. I'll measure tomorrow.

Cheers

Les


From: owner-rv10-list-server(at)matronics.com (owner-rv10-list-server(at)matronics.com) [mailto:owner-rv10-list-server(at)matronics.com (owner-rv10-list-server(at)matronics.com)] On Behalf Of Kelly McMullen
Sent: June-05-10 7:59 PM
To: rv10-list(at)matronics.com (rv10-list(at)matronics.com)
Subject: Re: Comm Antennas
Les,
That might be a good location for one antenna. Putting two antennas within about 2 ft of each other is not good.
I'd consider either mounting one near an access panel on underside of wing or far enough back in the tail cone to have more than 3 ft separation between antennas. Alternatives include a Bob Archer wingtip Com antenna, an antenna on the top of the fuselage. The more separation you can get, the better. Of course you also need to consider separation from your ELT antenna and from GPS antenna.
On Sat, Jun 5, 2010 at 5:04 PM, Les Kearney <kearney(at)shaw.ca (kearney(at)shaw.ca)> wrote:
Hi



I am planning on installing two Comant CI-122 antennas tomorrow. My plan is to fab doublers and install the antennas / doublers just aft and inboard of the fuse steps. My reason for this is I have inspection panels in that area for the steps so it seems like a good choice. I am not keen on installing anything where access is a problem.



Can anyone thing of reasons to not do what I plan? Are there better options for these antennas?



Cheers



Les

#40643


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wwc4(at)njit.edu
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PostPosted: Sun Jun 06, 2010 7:13 am    Post subject: Comm Antennas Reply with quote

Agree with Kelly on this.  Even Cirrus with their all composite airframes have one antenna on the top and the other on the belly. Certainly if one wants to follow function over form and there is no concern for remote ground reception, dual belly antennas will be fine.

 
On Sat, Jun 5, 2010 at 9:59 PM, Kelly McMullen <apilot2(at)gmail.com (apilot2(at)gmail.com)> wrote:
Quote:
Les,
That might be a good location for one antenna. Putting two antennas within about 2 ft of each other is not good.
I'd consider either mounting one near an access panel on underside of wing or far enough back in the tail cone to have more than 3 ft separation between antennas.  Alternatives include a Bob Archer wingtip Com antenna, an antenna on the top of the fuselage. The more separation you can get, the better. Of course you also need to consider separation from your ELT antenna and from GPS antenna.
 
--
William
http://nerv10.com/wcurtis/90Electrical/antenna.html
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Tim Olson



Joined: 25 Jan 2007
Posts: 2879

PostPosted: Sun Jun 06, 2010 7:26 am    Post subject: Comm Antennas Reply with quote

No problems here either. Maybe metal whips are less prone to issues due to size/design?
Tim


On Jun 6, 2010, at 9:14 AM, Deems Davis <deemsdavis(at)cox.net (deemsdavis(at)cox.net)> wrote:

[quote] I've not experienced any problems with ground operations. once caveat however, I have not had occasion to contact a remote facility while on the ground.

Deems

On 6/6/2010 6:51 AM, Perry, Phil wrote:
Quote:
v\:* {behavior:url(#default#VML);} o\:* {behavior:url(#default#VML);} w\:* {behavior:url(#default#VML);} .shape {behavior:url(#default#VML);} <![endif]--> <![endif]--> <![endif]-->
Yeah, that’s true Kelly. Deems are a little further forward and that gives a little bit of extra space between them.

I’d still be interested in knowing how it’s working out though.



From: Kelly McMullen [[url=mailto:apilot2(at)gmail.com]mailto:apilot2(at)gmail.com (apilot2(at)gmail.com)[/url]]
Sent: Sunday, June 06, 2010 7:26 AM
To: [url=mailto:rv10-list(at)matronics.com]rv10-list(at)matronics.com (rv10-list(at)matronics.com)[/url]
Subject: Re: Comm Antennas


I believe if you look carefully, Deems put his antennas under the back seat, not inside of the step mount. That allows more separation. I believe the number generally recommended is 4 ft between antennas, but that is hard to achieve and you probably can get away with a bit less. I can tell you that belly mounted antennas are not going to have stellar performance when on the ground. Whether it is difficulty talking to ground control or a nearby remote outlet for picking up a clearance, there is a benefit from having one antenna more elevated than possible on the belly. I have one on belly and one on top of fuselage on my Mooney. Not even airborne at altitude does the belly mounted antenna give better reception than the top mounted, and on the ground the belly mounted does lose reception depending on position on the airport.

I think where Les is proposing would be good for one antenna, but I wouldn't want it too close to the steps, and I still don't think it would be desirable to have both there.
On Sat, Jun 5, 2010 at 9:25 PM, Perry, Phil <[url=mailto:Phil.Perry(at)netapp.com]Phil.Perry(at)netapp.com (Phil.Perry(at)netapp.com)[/url]> wrote:
This is exactly the place where Deems installed his CI-122’s.

Flip through the folder:
http://www.deemsrv10.com/album/Sec%2033%20Baggage%20Area/index.html

Perhaps he can give a report.

Phil




From: Les Kearney [mailto:[url=mailto:kearney(at)shaw.ca]kearney(at)shaw.ca (kearney(at)shaw.ca)[/url]]
Sent: Saturday, June 05, 2010 11:00 PM

To: [url=mailto:rv10-list(at)matronics.com]rv10-list(at)matronics.com (rv10-list(at)matronics.com)[/url]

Subject: RE: Comm Antennas



Kelley

Is 3 ft the magic number? If so, I might be okay. I'll measure tomorrow.

Cheers

Les


From: [url=mailto:owner-rv10-list-server(at)matronics.com]owner-rv10-list-server(at)matronics.com (owner-rv10-list-server(at)matronics.com)[/url] [mailto:[url=mailto:owner-rv10-list-server(at)matronics.com]owner-rv10-list-server(at)matronics.com (owner-rv10-list-server(at)matronics.com)[/url]] On Behalf Of Kelly McMullen
Sent: June-05-10 7:59 PM
To: [url=mailto:rv10-list(at)matronics.com]rv10-list(at)matronics.com (rv10-list(at)matronics.com)[/url]
Subject: Re: Comm Antennas
Les,
That might be a good location for one antenna. Putting two antennas within about 2 ft of each other is not good.
I'd consider either mounting one near an access panel on underside of wing or far enough back in the tail cone to have more than 3 ft separation between antennas. Alternatives include a Bob Archer wingtip Com antenna, an antenna on the top of the fuselage. The more separation you can get, the better. Of course you also need to consider separation from your ELT antenna and from GPS antenna.
On Sat, Jun 5, 2010 at 5:04 PM, Les Kearney <[url=mailto:kearney(at)shaw.ca]kearney(at)shaw.ca (kearney(at)shaw.ca)[/url]> wrote:
Hi



I am planning on installing two Comant CI-122 antennas tomorrow. My plan is to fab doublers and install the antennas / doublers just aft and inboard of the fuse steps. My reason for this is I have inspection panels in that area for the steps so it seems like a good choice. I am not keen on installing anything where access is a problem.



Can anyone thing of reasons to not do what I plan? Are there better options for these antennas?



Cheers



Les

#40643


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PostPosted: Sun Jun 06, 2010 10:48 am    Post subject: Comm Antennas Reply with quote

does the transponder antenna need to be considered and what about ads-b transceiver antenna? nav and gps are receive only but do they need to be considered?I am not a fan of the archer ant for an ifr ship,in my experince they are quirky(I think thats a word).




--


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rleffler



Joined: 05 Nov 2006
Posts: 680

PostPosted: Sun Jun 06, 2010 12:23 pm    Post subject: Comm Antennas Reply with quote

Short answer, Yes……

GPS needs to be on top.     Cat whiskers can go on the top of the vertical or on the bottom of the tail, since you aren’t using the archer  (I’m not a fan either).  While Commant states that they should point forward, there are many RVs with them pointing aft underneath the empennage.    I would also suggest reading the install manual for your ads-b equipment.   NavWork is pretty up front, for an example, here’s an excerpt:  

[img]cid:image001.png(at)01CB0593.6B46BB00[/img]
I haven’t put in either of these yet, but I’m thinking the transponder will go in the tunnel near the firewall and the ADS-B will be back by the battery someplace.

bob

From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of pilotdds(at)aol.com
Sent: Sunday, June 06, 2010 2:47 PM
To: rv10-list(at)matronics.com
Subject: Re: Comm Antennas

does the transponder antenna need to be considered and what about ads-b transceiver antenna? nav and gps are receive only but do they need to be considered?I am not a fan of the archer ant for an ifr ship,in my experince they are quirky(I think thats a word).

--


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Dick Sipp



Joined: 11 Jan 2006
Posts: 215
Location: Hope, MI

PostPosted: Sun Jun 06, 2010 4:43 pm    Post subject: Comm Antennas Reply with quote

My com antennas are where Deems and most others have reported, below rear seat floors with good performance. Transponder is on belly centerline about 10 inches aft of firewall. In the past few months I have been getting an occasional report of intermittent response, seems to be when the radar sight is on the nose at relatively close range, most sites report normal ops after a few minutes of outage at most. VOR is Archer in wing tip, works fine.

I have a back up GPS and XM antennas mounted on the firewall under the top cowling, they both work fine.

Dick Sipp
N110DV 285 hours


From: pilotdds(at)aol.com (pilotdds(at)aol.com)
Sent: Sunday, June 06, 2010 2:46 PM
To: rv10-list(at)matronics.com (rv10-list(at)matronics.com)
Subject: Re: Comm Antennas


does the transponder antenna need to be considered and what about ads-b transceiver antenna? nav and gps are receive only but do they need to be considered?I am not a fan of the archer ant for an ifr ship,in my experince they are quirky(I think thats a word).



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PostPosted: Mon Jun 07, 2010 5:18 am    Post subject: Comm Antennas Reply with quote

 
consider one Dorne & Margolen (DM) antenna on the belly with a diplexer inside of the airplane.  The DM antenna will increase your range substantially and the diplexer will eliminate the need for 2 antennae.  I noticed that after I installed the DM antenna (removed the comants) my range increased by at least  50 percent. 
 
good luck.
Dick Martin
RV8 N233m
the fast one
 
 
 
 
 
On Sat, Jun 5, 2010 at 8:59 PM, Kelly McMullen <apilot2(at)gmail.com (apilot2(at)gmail.com)> wrote:
[quote]Les,
That might be a good location for one antenna. Putting two antennas within about 2 ft of each other is not good.
I'd consider either mounting one near an access panel on underside of wing or far enough back in the tail cone to have more than 3 ft separation between antennas.  Alternatives include a Bob Archer wingtip Com antenna, an antenna on the top of the fuselage. The more separation you can get, the better. Of course you also need to consider separation from your ELT antenna and from GPS antenna.

On Sat, Jun 5, 2010 at 5:04 PM, Les Kearney <kearney(at)shaw.ca (kearney(at)shaw.ca)> wrote:

Quote:
Hi
 
I am planning on installing two Comant CI-122 antennas tomorrow. My plan is to fab doublers and install the antennas / doublers just aft and inboard of the fuse steps. My reason for this is I have inspection panels in that area for the steps so it seems like a good choice. I am not keen on installing anything where access is a problem.
 
Can anyone thing of reasons to not do what I plan? Are there better options for these antennas?
 
Cheers
 
Les
#40643
 

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PostPosted: Mon Jun 07, 2010 9:26 am    Post subject: Re: Comm Antennas Reply with quote

I don't think the last suggestion will work. The usual passive splitter (diplexer?) will allow half the transmitter power to go directly into the second com radio--not good. Also these matched splitters may or may not handle thepower. If you put an active switch for the diplexer then you won't be able to hear on both radios simultaneously.

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