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flysrv10(at)gmail.com
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 Posted: Sat Sep 24, 2011 1:24 am Post subject: antenna locations |
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I am installing Navwox UAT (ADSB) and one of the requirements for the transponder antenna placement is 5' from other antennas. This leaves the area under the belly aft of the baggage compartment my most logical choice. I am planning to place the antenna between my Marker Beacon (boat antenna) located somewhere near the battery and the VOR (whisker) antenna under the horizontal stab.
I have to compromise and place the antenna closer to MB antenna. Anyone has any facts regarding how close I can come to MB antenna? How about if I line up the new antenna exactly on the MB antenna's long axis. It seems the sides of the MB antenna are the reception areas.
Is the distance between antennas measured from tip of the or their bases.
Thank you.
Rob Kermanj
Do Not archive.
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johngoodman
Joined: 18 Sep 2006
Posts: 530
Location: GA
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| Posted: Sat Sep 24, 2011 3:38 am Post subject: Re: antenna locations |
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Rob,
Have you considered moving the Marker Beacon antenna? I imagine it can go almost anywhere.
John
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pitts_pilot(at)bellsouth.
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| Posted: Sat Sep 24, 2011 4:03 am Post subject: antenna locations |
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I'd talk to NavWorks and ask 'why'. The separation distance usually
applies to antennas that transmit and/or receive, and 2' is a common
distance. The separation keeps the transmitting antenna from swamping
receiver antennas and/or damaging the 'delicate' amplifiers made to pick
up small signals. Receiver front ends are now far more capable of
dealing with large signals than older equipment. It's called progress,
which comes slowl
I think 5' is unusually large, but I'm not writing the specs that the
FAA requires for the TSO, if that's where the parameter comes from. I
suspect that somewhere, someone figured that if 2' is good, 5' is
better. It also could be Navworks being terribly conservative so as to
head off installation problems down the road. Only NavWorks can answer
that, and getting to talk to someone that really has the answer can be
problematic.
Having said all that and trying to answer one of your questions .....
don't be completely anal about the distance from different 'parts' of
the antenna. If it's close to 5' separation that should be OK. If you
have the time to set up the equipment and power it up on the bench, you
can move the antennas around and see just what the effect is. Much
easier than re-locating an antenna when you're in phase 1 (or 2, 3, 4
...... ) testing.
Linn
On 9/24/2011 5:20 AM, Rob Kermanj wrote:
| Quote: |
I am installing Navwox UAT (ADSB) and one of the requirements for the transponder antenna placement is 5' from other antennas. This leaves the area under the belly aft of the baggage compartment my most logical choice. I am planning to place the antenna between my Marker Beacon (boat antenna) located somewhere near the battery and the VOR (whisker) antenna under the horizontal stab.
I have to compromise and place the antenna closer to MB antenna. Anyone has any facts regarding how close I can come to MB antenna? How about if I line up the new antenna exactly on the MB antenna's long axis. It seems the sides of the MB antenna are the reception areas.
Is the distance between antennas measured from tip of the or their bases.
Thank you.
Rob Kermanj
Do Not archive.
|
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Kelly McMullen
Joined: 16 Apr 2008
Posts: 1188
Location: Sun Lakes AZ
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| Posted: Sat Sep 24, 2011 4:51 am Post subject: antenna locations |
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The MB antenna location is the least critical, and MB is probably less
useful than an ADF these days, with the FAA decommissioning almost all
of them other than inner markers for Cat II & III.
On Sat, Sep 24, 2011 at 2:20 AM, Rob Kermanj <flysrv10(at)gmail.com> wrote:
| Quote: |
I am installing Navwox UAT (ADSB) and one of the requirements for the transponder antenna placement is 5' from other antennas. This leaves the area under the belly aft of the baggage compartment my most logical choice. I am planning to place the antenna between my Marker Beacon (boat antenna) located somewhere near the battery and the VOR (whisker) antenna under the horizontal stab.
I have to compromise and place the antenna closer to MB antenna. Anyone has any facts regarding how close I can come to MB antenna? How about if I line up the new antenna exactly on the MB antenna's long axis. It seems the sides of the MB antenna are the reception areas.
Is the distance between antennas measured from tip of the or their bases.
Thank you.
Rob Kermanj
Do Not archive.
|
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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor
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flysrv10(at)gmail.com
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| Posted: Sat Sep 24, 2011 4:57 am Post subject: antenna locations |
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I have not. If I do, it leave holes in the fuselage. I would rather work around it if it possible.
Rob.
Do not archive
On Sep 24, 2011, at 7:38 AM, johngoodman wrote:
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flysrv10(at)gmail.com
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| Posted: Sat Sep 24, 2011 5:02 am Post subject: antenna locations |
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Not sure if Navwox is requiring it. Below is the text from Navworx installation manual:
"The UAT Antenna MUST be installed no less than 5 feet from any Transponder /TCAS/TAS or DME antenna. Failure to adhere to this critical installation note will result in failure of the ADS600-B and void your warranty. "
It looks like MB and VOR antennas are Except (?). 2' is good then?
Rob
do not archive
On Sep 24, 2011, at 8:00 AM, Linn Walters wrote:
[quote]--> RV10-List message posted by: Linn Walters <pitts_pilot(at)bellsouth.net (pitts_pilot(at)bellsouth.net)>
I'd talk to NavWorks and ask 'why'. The separation distance usually applies to antennas that transmit and/or receive, and 2' is a common distance. The separation keeps the transmitting antenna from swamping receiver antennas and/or damaging the 'delicate' amplifiers made to pick up small signals. Receiver front ends are now far more capable of dealing with large signals than older equipment. It's called progress, which comes slowl
I think 5' is unusually large, but I'm not writing the specs that the FAA requires for the TSO, if that's where the parameter comes from. I suspect that somewhere, someone figured that if 2' is good, 5' is better. It also could be Navworks being terribly conservative so as to head off installation problems down the road. Only NavWorks can answer that, and getting to talk to someone that really has the answer can be problematic.
Having said all that and trying to answer one of your questions ..... don't be completely anal about the distance from different 'parts' of the antenna. If it's close to 5' separation that should be OK. If you have the time to set up the equipment and power it up on the bench, you can move the antennas around and see just what the effect is. Much easier than re-locating an antenna when you're in phase 1 (or 2, 3, 4 ....... ) testing.
Linn
On 9/24/2011 5:20 AM, Rob Kermanj wrote:
[quote]--> RV10-List message posted by: Rob Kermanj<flysrv10(at)gmail.com (flysrv10(at)gmail.com)>
I am installing Navwox UAT (ADSB) and one of the requirements for the transponder antenna placement is 5' from other antennas. This leaves the area under the belly aft of the baggage compartment my most logical choice. I am planning to place the antenna between my Marker Beacon (boat antenna) located somewhere near the battery and the VOR (whisker) antenna under the horizontal stab.
I have to compromise and place the antenna closer to MB antenna. Anyone has any facts regarding how close I can come to MB antenna? How about if I line up the new antenna exactly on the MB antenna's long axis. It seems the sides of the MB antenna are the reception areas.
Is the distance between antennas measured from tip of the or their bases.
Thank you.
Rob Kermanj
Do Not archive.
http://www.matronics========================[b]http://www.matronics.com/co=================
[b]
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flysrv10(at)gmail.com
Guest
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| Posted: Sat Sep 24, 2011 5:03 am Post subject: antenna locations |
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I agree. Time were different when I installed it.
Rob.
do not archive
On Sep 24, 2011, at 8:48 AM, Kelly McMullen wrote:
| Quote: |
The MB antenna location is the least critical, and MB is probably less
useful than an ADF these days, with the FAA decommissioning almost all
of them other than inner markers for Cat II & III.
On Sat, Sep 24, 2011 at 2:20 AM, Rob Kermanj <flysrv10(at)gmail.com> wrote:
>
>
> I am installing Navwox UAT (ADSB) and one of the requirements for the transponder antenna placement is 5' from other antennas. This leaves the area under the belly aft of the baggage compartment my most logical choice. I am planning to place the antenna between my Marker Beacon (boat antenna) located somewhere near the battery and the VOR (whisker) antenna under the horizontal stab.
>
> I have to compromise and place the antenna closer to MB antenna. Anyone has any facts regarding how close I can come to MB antenna? How about if I line up the new antenna exactly on the MB antenna's long axis. It seems the sides of the MB antenna are the reception areas.
>
> Is the distance between antennas measured from tip of the or their bases.
>
> Thank you.
>
> Rob Kermanj
>
> Do Not archive.
>
>
>
>
>
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carl.froehlich(at)verizon
Guest
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| Posted: Sat Sep 24, 2011 5:13 am Post subject: antenna locations |
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Marker Beacon systems are unique in how they work. They have a lot of
transmit power (relative to what they do) and the radiation pattern is
straight up. As such, Marker Beacon antennas need not be elaborate affairs
as the best on in the world will hear the beacon a only short distance
further than a random piece of wire connected to the back of the receiver
(and for what you need a marker for, you don't want it to go off too far
away). For my 8A, I have a piece of wire 37" long in the bottom of the
cowl connected to a BNC bulkhead connector. It works quite well. For the
10, I have the same arrangement but in one wing tip. For those engineers
out there, this setup is a 1/4 wavelength antenna, feed at the bottom (the
bulkhead BNC connector) and working against ground (the firewall in the 8A
and the end wing rib in the 10).
As I have mentioned on other posts, I built both the 8A and the 10 VOR
antennas which are mounted in the wingtip (perhaps a couple of dollars for
hardware and aluminum out of the scrap box). I will concede that this
arrangement does not have the range of a perfect HS mounted antenna, but I
can say by experience that this antenna receives both VOR and ILS signals at
ranges exceeding any practical value.
Carl
--
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dave.saylor.aircrafters(a
Guest
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| Posted: Sat Sep 24, 2011 5:49 am Post subject: antenna locations |
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Rob,
The main concern is to keep the NavWorx antenna far from the the other antennas transmitting on similar frequencies: transponder, TCAS, etc. Since the marker doesn't transmit, I wouldn't worry too much about proximity. I put my UAT under the baggage floor and it works just fine. I used the Delta Pop antenna that NavWorx recommended.
Dave Saylor
AirCrafters
140 Aviation Way
Watsonville, CA 95076
831-722-9141 Shop
831-750-0284 Cell
On Sat, Sep 24, 2011 at 2:20 AM, Rob Kermanj <flysrv10(at)gmail.com (flysrv10(at)gmail.com)> wrote:
[quote] --> RV10-List message posted by: Rob Kermanj <flysrv10(at)gmail.com (flysrv10(at)gmail.com)>
I am installing Navwox UAT (ADSB) and one of the requirements for the transponder antenna placement is 5' from other antennas. Â This leaves the area under the belly aft of the baggage compartment my most logical choice. Â I am planning to place the antenna between my Marker Beacon (boat antenna) located somewhere near the battery and the VOR (whisker) antenna under the horizontal stab.
I have to compromise and place the antenna closer to MB antenna. Â Anyone has any facts regarding how close I can come to MB antenna? Â How about if I line up the new antenna exactly on the MB antenna's long axis. Â It seems the sides of the MB antenna are the reception areas.
Is the distance between antennas measured from tip of the or their bases.
Thank you.
Rob Kermanj
Do Not archive.
===========
" target="_blank">http://www.matronics.com/Navigator?RV10-List
===========
MS -
k">http://forums.matronics.com
===========
e -
     -Matt Dralle, List Admin.
t="_blank">http://www.matronics.com/contribution
===========
[b]
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flysrv10(at)gmail.com
Guest
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| Posted: Sat Sep 24, 2011 6:30 am Post subject: antenna locations |
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Thanks Dave.
I was just worrying that the Delta Pop (my choice also) transmission would generate audio my MB audio panel. Not a concern then?
RobK
do not archive
On Sep 24, 2011, at 9:46 AM, Dave Saylor wrote:
[quote]Rob,
The main concern is to keep the NavWorx antenna far from the the other antennas transmitting on similar frequencies: transponder, TCAS, etc. Since the marker doesn't transmit, I wouldn't worry too much about proximity. I put my UAT under the baggage floor and it works just fine. I used the Delta Pop antenna that NavWorx recommended.
Dave Saylor
AirCrafters
140 Aviation Way
Watsonville, CA 95076
831-722-9141 Shop
831-750-0284 Cell
On Sat, Sep 24, 2011 at 2:20 AM, Rob Kermanj <flysrv10(at)gmail.com (flysrv10(at)gmail.com)> wrote:
| Quote: | --> RV10-List message posted by: Rob Kermanj <flysrv10(at)gmail.com (flysrv10(at)gmail.com)>
I am installing Navwox UAT (ADSB) and one of the requirements for the transponder antenna placement is 5' from other antennas. This leaves the area under the belly aft of the baggage compartment my most logical choice. I am planning to place the antenna between my Marker Beacon (boat antenna) located somewhere near the battery and the VOR (whisker) antenna under the horizontal stab.
I have to compromise and place the antenna closer to MB antenna. Anyone has any facts regarding how close I can come to MB antenna? How about if I line up the new antenna exactly on the MB antenna's long axis. It seems the sides of the MB antenna are the reception areas.
Is the distance between antennas measured from tip of the or their bases.
Thank you.
Rob Kermanj
Do Not archive.
===========
" target="_blank">http://www.matronics.com/Navigator?RV10-List
===========
MS -
k">http://forums.matronics.com
===========
e -
-Matt Dralle, List Admin.
t="_blank">http://www.matronics.com/contribution
===========
|
[b]
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dave.saylor.aircrafters(a
Guest
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| Posted: Sat Sep 24, 2011 6:56 am Post subject: antenna locations |
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My MB is a wire in the wingtip, so it's not as close as yours. But the frequencies are so different that I don't think you'll have a problem. I put my UAT antenna at the aft edge of the baggage compartment, just to get it as far as possible from my comm. No issues there at all. If you can place the UAT a little further forward, say one or two feet from the marker, I can't imagine you'd hear anything from it.
Dave Saylor
AirCrafters
140 Aviation Way
Watsonville, CA 95076
831-722-9141 Shop
831-750-0284 Cell
On Sat, Sep 24, 2011 at 7:27 AM, Rob Kermanj <flysrv10(at)gmail.com (flysrv10(at)gmail.com)> wrote:
[quote] Thanks Dave.
I was just worrying that the Delta Pop (my choice also) transmission would generate audio my MB audio panel. Â Not a concern then?
RobK
do not archive
On Sep 24, 2011, at 9:46 AM, Dave Saylor wrote:
| Quote: | Rob,
The main concern is to keep the NavWorx antenna far from the the other antennas transmitting on similar frequencies: transponder, TCAS, etc. Since the marker doesn't transmit, I wouldn't worry too much about proximity. I put my UAT under the baggage floor and it works just fine. I used the Delta Pop antenna that NavWorx recommended.
Dave Saylor
AirCrafters
140 Aviation Way
Watsonville, CA 95076
[url=tel:831-722-9141]831-722-9141[/url] Shop
[url=tel:831-750-0284]831-750-0284[/url] Cell
On Sat, Sep 24, 2011 at 2:20 AM, Rob Kermanj <flysrv10(at)gmail.com (flysrv10(at)gmail.com)> wrote:
| Quote: | --> RV10-List message posted by: Rob Kermanj <flysrv10(at)gmail.com (flysrv10(at)gmail.com)>
I am installing Navwox UAT (ADSB) and one of the requirements for the transponder antenna placement is 5' from other antennas. Â This leaves the area under the belly aft of the baggage compartment my most logical choice. Â I am planning to place the antenna between my Marker Beacon (boat antenna) located somewhere near the battery and the VOR (whisker) antenna under the horizontal stab.
I have to compromise and place the antenna closer to MB antenna. Â Anyone has any facts regarding how close I can come to MB antenna? Â How about if I line up the new antenna exactly on the MB antenna's long axis. Â It seems the sides of the MB antenna are the reception areas.
Is the distance between antennas measured from tip of the or their bases.
Thank you.
Rob Kermanj
Do Not archive.
===========
" target="_blank">http://www.matronics.com/Navigator?RV10-List
===========
MS -
k">http://forums.matronics.com
===========
e -
     -Matt Dralle, List Admin.
t="_blank">http://www.matronics.com/contribution
===========
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3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
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flysrv10(at)gmail.com
Guest
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| Posted: Sat Sep 24, 2011 9:30 am Post subject: antenna locations |
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Ok. Thanks. I'll keep it as far away and not worry about it. Good thing is that the vOR and MB will be obsolete soon anyway.
Do not archive
On Sep 24, 2011, at 10:53 AM, Dave Saylor wrote:
[quote]My MB is a wire in the wingtip, so it's not as close as yours. But the frequencies are so different that I don't think you'll have a problem. I put my UAT antenna at the aft edge of the baggage compartment, just to get it as far as possible from my comm. No issues there at all. If you can place the UAT a little further forward, say one or two feet from the marker, I can't imagine you'd hear anything from it.
Dave Saylor
AirCrafters
140 Aviation Way
Watsonville, CA 95076
831-722-9141 Shop
831-750-0284 Cell
On Sat, Sep 24, 2011 at 7:27 AM, Rob Kermanj <flysrv10(at)gmail.com (flysrv10(at)gmail.com)> wrote:
| Quote: | Thanks Dave.
I was just worrying that the Delta Pop (my choice also) transmission would generate audio my MB audio panel. Not a concern then?
RobK
do not archive
On Sep 24, 2011, at 9:46 AM, Dave Saylor wrote:
| Quote: | Rob,
The main concern is to keep the NavWorx antenna far from the the other antennas transmitting on similar frequencies: transponder, TCAS, etc. Since the marker doesn't transmit, I wouldn't worry too much about proximity. I put my UAT under the baggage floor and it works just fine. I used the Delta Pop antenna that NavWorx recommended.
Dave Saylor
AirCrafters
140 Aviation Way
Watsonville, CA 95076
[url=tel:831-722-9141]831-722-9141[/url] Shop
[url=tel:831-750-0284]831-750-0284[/url] Cell
On Sat, Sep 24, 2011 at 2:20 AM, Rob Kermanj <flysrv10(at)gmail.com (flysrv10(at)gmail.com)> wrote:
| Quote: | --> RV10-List message posted by: Rob Kermanj <flysrv10(at)gmail.com (flysrv10(at)gmail.com)>
I am installing Navwox UAT (ADSB) and one of the requirements for the transponder antenna placement is 5' from other antennas. This leaves the area under the belly aft of the baggage compartment my most logical choice. I am planning to place the antenna between my Marker Beacon (boat antenna) located somewhere near the battery and the VOR (whisker) antenna under the horizontal stab.
I have to compromise and place the antenna closer to MB antenna. Anyone has any facts regarding how close I can come to MB antenna? How about if I line up the new antenna exactly on the MB antenna's long axis. It seems the sides of the MB antenna are the reception areas.
Is the distance between antennas measured from tip of the or their bases.
Thank you.
Rob Kermanj
Do Not archive.
===========
" target="_blank">http://www.matronics.com/Navigator?RV10-List
===========
MS -
k">http://forums.matronics.com
===========
e -
-Matt Dralle, List Admin.
t="_blank">http://www.matronics.com/contribution
===========
|
3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
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pitts_pilot(at)bellsouth.
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| Posted: Sat Sep 24, 2011 9:53 am Post subject: antenna locations |
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I would say so. Neither the VOR or MB transmits. It also hints that the receiver may not be robust enough to tolerate large signals. Keep us posted as I'm looking at the ADS600-B down the road. By the time I get to fly there may be more competition.
Linn
On 9/24/2011 8:59 AM, Rob Kermanj wrote: [quote]Not sure if Navwox is requiring it. Below is the text from Navworx installation manual:
"The UAT Antenna MUST be installed no less than 5 feet from any Transponder /TCAS/TAS or DME antenna. Failure to adhere to this critical installation note will result in failure of the ADS600-B and void your warranty. "
It looks like MB and VOR antennas are Except (?). 2' is good then?
Rob
do not archive
On Sep 24, 2011, at 8:00 AM, Linn Walters wrote:
| Quote: | --> RV10-List message posted by: Linn Walters <pitts_pilot(at)bellsouth.net (pitts_pilot(at)bellsouth.net)>
I'd talk to NavWorks and ask 'why'. The separation distance usually applies to antennas that transmit and/or receive, and 2' is a common distance. The separation keeps the transmitting antenna from swamping receiver antennas and/or damaging the 'delicate' amplifiers made to pick up small signals. Receiver front ends are now far more capable of dealing with large signals than older equipment. It's called progress, which comes slowl
I think 5' is unusually large, but I'm not writing the specs that the FAA requires for the TSO, if that's where the parameter comes from. I suspect that somewhere, someone figured that if 2' is good, 5' is better. It also could be Navworks being terribly conservative so as to head off installation problems down the road. Only NavWorks can answer that, and getting to talk to someone that really has the answer can be problematic.
Having said all that and trying to answer one of your questions ..... don't be completely anal about the distance from different 'parts' of the antenna. If it's close to 5' separation that should be OK. If you have the time to set up the equipment and power it up on the bench, you can move the antennas around and see just what the effect is. Much easier than re-locating an antenna when you're in phase 1 (or 2, 3, 4 ....... ) testing.
Linn
On 9/24/2011 5:20 AM, Rob Kermanj wrote:
| Quote: | --> RV10-List message posted by: Rob Kermanj<flysrv10(at)gmail.com (flysrv10(at)gmail.com)>
I am installing Navwox UAT (ADSB) and one of the requirements for the transponder antenna placement is 5' from other antennas. This leaves the area under the belly aft of the baggage compartment my most logical choice. I am planning to place the antenna between my Marker Beacon (boat antenna) located somewhere near the battery and the VOR (whisker) antenna under the horizontal stab.
I have to compromise and place the antenna closer to MB antenna. Anyone has any facts regarding how close I can come to MB antenna? How about if I line up the new antenna exactly on the MB antenna's long axis. It seems the sides of the MB antenna are the reception areas.
Is the distance between antennas measured from tip of the or their bases.
Thank you.
Rob Kermanj
Do Not archive.
http://www.matronics========================http://www.matronics.com/co=================
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flysrv10(at)gmail.com
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| Posted: Sun Sep 25, 2011 1:24 am Post subject: antenna locations |
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Ok I will keep you posted. I should done with the installation by the end of next week.
Do not archive
Rob Kermanj
Sent from my iPad
On Sep 24, 2011, at 1:50 PM, Linn Walters <pitts_pilot(at)bellsouth.net (pitts_pilot(at)bellsouth.net)> wrote:
[quote] I would say so. Neither the VOR or MB transmits. It also hints that the receiver may not be robust enough to tolerate large signals. Keep us posted as I'm looking at the ADS600-B down the road. By the time I get to fly there may be more competition.
Linn
On 9/24/2011 8:59 AM, Rob Kermanj wrote: | Quote: | Not sure if Navwox is requiring it. Below is the text from Navworx installation manual:
"The UAT Antenna MUST be installed no less than 5 feet from any Transponder /TCAS/TAS or DME antenna. Failure to adhere to this critical installation note will result in failure of the ADS600-B and void your warranty. "
It looks like MB and VOR antennas are Except (?). 2' is good then?
Rob
do not archive
On Sep 24, 2011, at 8:00 AM, Linn Walters wrote:
| Quote: | --> RV10-List message posted by: Linn Walters <[url=mailto:pitts_pilot(at)bellsouth.net]pitts_pilot(at)bellsouth.net (pitts_pilot(at)bellsouth.net)[/url]>
I'd talk to NavWorks and ask 'why'. The separation distance usually applies to antennas that transmit and/or receive, and 2' is a common distance. The separation keeps the transmitting antenna from swamping receiver antennas and/or damaging the 'delicate' amplifiers made to pick up small signals. Receiver front ends are now far more capable of dealing with large signals than older equipment. It's called progress, which comes slowl
I think 5' is unusually large, but I'm not writing the specs that the FAA requires for the TSO, if that's where the parameter comes from. I suspect that somewhere, someone figured that if 2' is good, 5' is better. It also could be Navworks being terribly conservative so as to head off installation problems down the road. Only NavWorks can answer that, and getting to talk to someone that really has the answer can be problematic.
Having said all that and trying to answer one of your questions ..... don't be completely anal about the distance from different 'parts' of the antenna. If it's close to 5' separation that should be OK. If you have the time to set up the equipment and power it up on the bench, you can move the antennas around and see just what the effect is. Much easier than re-locating an antenna when you're in phase 1 (or 2, 3, 4 ....... ) testing.
Linn
On 9/24/2011 5:20 AM, Rob Kermanj wrote:
| Quote: | --> RV10-List message posted by: Rob Kermanj<[url=mailto:flysrv10(at)gmail.com]flysrv10(at)gmail.com (flysrv10(at)gmail.com)[/url]>
I am installing Navwox UAT (ADSB) and one of the requirements for the transponder antenna placement is 5' from other antennas. This leaves the area under the belly aft of the baggage compartment my most logical choice. I am planning to place the antenna between my Marker Beacon (boat antenna) located somewhere near the battery and the VOR (whisker) antenna under the horizontal stab.
I have to compromise and place the antenna closer to MB antenna. Anyone has any facts regarding how close I can come to MB antenna? How about if I line up the new antenna exactly on the MB antenna's long axis. It seems the sides of the MB antenna are the reception areas.
Is the distance between antennas measured from tip of the or their bases.
Thank you.
Rob Kermanj
Do Not archive.
http://www.matronics========================http://www.matronics.com/co=================
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cjhukill(at)cox.net
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| Posted: Sun Sep 25, 2011 5:50 am Post subject: antenna locations |
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The MB and ADF may not be obsolete as soon as GPS if Obama’s sponsor Lightsquare gets their way!<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />
[quote][b]
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Kelly McMullen
Joined: 16 Apr 2008
Posts: 1188
Location: Sun Lakes AZ
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| Posted: Sun Sep 25, 2011 7:22 am Post subject: antenna locations |
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If the FCC continues its boneheaded ways, they will have to turn Loran
back on. However, Lightsquared's approvals date back before the
current administration. The FCC is allegedly an independent
commission, so politics role is so far speculative, and not worthy of
discussion here. If one discusses politics, all building stops, and
there will be no more RV grins..........so go bang some rivets and
shed any frustrations with making the next most perfect airplane. 
On Sun, Sep 25, 2011 at 6:46 AM, Chris Hukill <cjhukill(at)cox.net> wrote:
| Quote: | The MB and ADF may not be obsolete as soon as GPS if Obama’s sponsor
Lightsquare gets their way!
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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor
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