Today's Message Index:
----------------------
1. 06:25 AM - Re: Re: Transponder and ADS Antenna Mounting Location Questions For (Kelly McMullen)
2. 07:28 AM - Re: Infinity Aero Grip and Starter Switch (Robert L. Nuckolls, III)
3. 07:38 AM - Re: Re: Transponder and ADS Antenna Mounting Location Questions For (William Hunter)
4. 07:40 AM - Re: Re: Transponder and ADS Antenna Mounting Location Questions For (Robert L. Nuckolls, III)
5. 07:41 AM - Re: Infinity Aero Grip and Starter Switch (William Hunter)
6. 07:47 AM - Re: Re: Transponder and ADS Antenna Mounting Location Questions For (Kelly McMullen)
7. 07:58 AM - Re: Re: Transponder and ADS Antenna Mounting Location Questions For (William Hunter)
8. 08:10 AM - Re: Re: Transponder and ADS Antenna Mounting Location Questions For (Kelly McMullen)
9. 10:41 AM - Re: Transponder and ADS Antenna Mounting Location Questions For (user9253)
10. 11:01 AM - Re: Re: Transponder and ADS Antenna Mounting Location Questions For (William Hunter)
11. 03:01 PM - Re: Re: Transponder and ADS Antenna Mounting Location Questions For (Robert L. Nuckolls, III)
Message 1
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| Subject: | Re: Transponder and ADS Antenna Mounting Location |
Questions For
I think you are confusing yourself with too much information. What you
have is the Dynon(Trig) SV-261 transponder, which is the Out unit on
1090-ES. This should be connected to your existing monopole transponder
antenna. Then you have the SV-470 ADS-B Receiver or In unit. It needs
the same variety antenna, but not a ground plane, and can be anywhere
that is at least 2 ft away from your existing transponder antenna.
Do not get confused about the GTN-650. It is a GPS/Nav/Com unit that
does NOT receive any ADS-B or other traffic information on its own. It
is only able to display information received by your transponder or
ADS-B In unit.
I have the same equipment in my RV-10. My transponder antenna is a short
distance behind the firewall on the belly. My ADS-B receiver antenna is
on the belly in the tailcone. I realize with a canard, your convenient
locations are different...just get the distance you need. Under the
Canard should be fine, if you can get the distance and easy mounting.
On 5/22/2016 9:56 PM, William Hunter wrote:
> Joe,
>
> This is really valuable information. Sounds like you know your stuff so
> if I could kindly pick a bit more of your brain
>
> I am running the SV-XPNDR-260 and it is supposed to be the
> higher-powered transponder that dynon offers I'm running the dynon ADDB
> receiver for traffic.
>
> The ideal location for convenience of installation would be to install
> the monopole antenna directly underneath the Canard. If I installed it
> like I am thinking then the monopole antenna would be sticking down from
> the Cunard and since the Canard is mounted up high in the nose cone of
> the airplane the antenna would not be sticking out below the bottom of
> the airplane assuming there's no carbon graphite in that section of the
> airplane and assuming there's no paint that has some kind of chromate
> based material then my question is would the antenna be able to still
> receive the ground-based signals?
>
> To add to my confusion I will also be running a Garmin gtn - 650 and it
> is supposed to be able to receive ADS-B signals. . Should I purchase an
> additional monopole antenna for that unit as well or should I just run
> with the dynon unit?
>
> Subject is way out of my league so any help from you or some of the
> other sharp guys on this forum would be greatly helpful!
>
> THANKS AGAIN FOR YOUR HELP!!!
>
> Bill Hunter
>
> On May 22, 2016 6:30 PM, "user9253" <fransew@gmail.com
> <mailto:fransew@gmail.com>> wrote:
>
> <fransew@gmail.com <mailto:fransew@gmail.com>>
>
> Assuming that you are installing the SV-XPNDR-261, why not use the
> existing transponder antenna? Since the original transponder worked
> OK with that egg shaped ground plane, that reinforces my post that
> shape and size makes a theoretical difference, but is not critical
> in real life.
> The SV-ADSB-470 antenna is receive only. It will not affect the
> operation of ADAHRS or Magnetometer. Keep the ADSB-470 antenna away
> from other transmitting antennas, especially the transponder antenna.
> The SV-ADSB-470 receives 978 only, not 1090. If you are out of
> range of an ADS-B ground station (maybe in a traffic pattern), you
> will not see traffic transmitting ADS-B out on 1090, i.e., other
> SkyView transponders. Dynon needs to offer a dual band ADS-B receiver.
>
> --------
> Joe Gores
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=456477#456477
>
>
> ==========
> -
> Electric-List" rel="noreferrer"
> target="_blank">http://www.matronics.com/Navigator?AeroElectric-List
> ==========
> FORUMS -
> eferrer" target="_blank">http://forums.matronics.com
> ==========
> WIKI -
> errer" target="_blank">http://wiki.matronics.com
> ==========
> b Site -
> -Matt Dralle, List Admin.
> rel="noreferrer" target="_blank">http://www.matronics.com/contribution
> ==========
>
>
Message 2
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| Subject: | Re: Infinity Aero Grip and Starter Switch |
At 12:25 AM 5/23/2016, you wrote:
>I work next door to a radio shop and since I=C2
>have an experiental=C2 I hear all the experimental
>gripes. Recently they were doing radio work=C2 on
>an RV. The builder put a=C2 starter switch on the
>stick. It was unmarked and they inadvertently
>pushed it, with nearly disastrous results. Sorry
>I don't mean to change subjects but please make
>sure it's well marked and obvious--ya never know
>who's gonna push what buttons.=C2
Better yet . . . don't do that. Probably a million
airplanes have been produced were the starter controls
were NOT on the stick . . . or anywhere else that
could be inadvertently operated . . .that issue
has never bubbled up as a human-factors 'problem'
to be fixed.
But more importantly, the FURTHER your airplane
departs from historic configurations, the greater
the risk for bad results from common assumptions.
Bob . . .
Message 3
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| Subject: | Re: Transponder and ADS Antenna Mounting Location |
Questions For
THANKS Kelly!!!
> What you have is the Dynon(Trig) SV-261 transponder, which is the Out unit on
1090-ES. This should be connected to your existing monopole transponder antenna.
Yes. My existing monopole antenna is attached to the "corner" (edge) of the existing
egg shaped ground plane. I really want to get this ground plane issue
squared away (sorry could not resist).
My question is what is the best size and shape for this transponder monopole antenna?
The Dynon manuals says 120 MM X 120 MM is minimum and 700 MM X 700 MM is
best but way too big for my airplane. Then it says intervals of wave length
distance "should be avoided" however what are the intermediate steps that are
best and what should be avoided?
>Then you have the SV-470 ADS-B Receiver or In unit. It needs the same variety
antenna, but not a ground plane, and can be anywhere that is at least 2 ft away
from your existing transponder antenna.
Yes. Reading the Dynon manual it says to make sure there is a ground plane
Same question as above... What are the intervals that the ADSB ground plane should
be?
130 MM X 130 MM is minimum and their best size is 780 MM X 780 MM but that is too
big for my airplane...and intermediate steps are bad so what are the intermediate
steps that are best and what should be avoided?
>Do not get confused about the GTN-650. It is a GPS/Nav/Com unit that does NOT
receive any ADS-B or other traffic information on its own. It is only able to
display information received by your transponder or ADS-B In unit.
Good call Kelly...I did not gather that fine point.
THANKS AGAIN!!!!
..
Cheers!!!
Bill Hunter
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Kelly McMullen
Sent: Monday, May 23, 2016 6:24 AM
Subject: Re: AeroElectric-List: Re: Transponder and ADS Antenna Mounting Location
Questions For
--> <kellym@aviating.com>
I think you are confusing yourself with too much information. What you have is
the Dynon(Trig) SV-261 transponder, which is the Out unit on 1090-ES. This should
be connected to your existing monopole transponder antenna. Then you have
the SV-470 ADS-B Receiver or In unit. It needs the same variety antenna, but not
a ground plane, and can be anywhere that is at least 2 ft away from your existing
transponder antenna.
Do not get confused about the GTN-650. It is a GPS/Nav/Com unit that does NOT receive
any ADS-B or other traffic information on its own. It is only able to display
information received by your transponder or ADS-B In unit.
I have the same equipment in my RV-10. My transponder antenna is a short distance
behind the firewall on the belly. My ADS-B receiver antenna is on the belly
in the tailcone. I realize with a canard, your convenient locations are different...just
get the distance you need. Under the Canard should be fine, if you
can get the distance and easy mounting.
On 5/22/2016 9:56 PM, William Hunter wrote:
> Joe,
>
> This is really valuable information. Sounds like you know your stuff
> so if I could kindly pick a bit more of your brain
>
> I am running the SV-XPNDR-260 and it is supposed to be the
> higher-powered transponder that dynon offers I'm running the dynon
> ADDB receiver for traffic.
>
> The ideal location for convenience of installation would be to install
> the monopole antenna directly underneath the Canard. If I installed
> it like I am thinking then the monopole antenna would be sticking down
> from the Cunard and since the Canard is mounted up high in the nose
> cone of the airplane the antenna would not be sticking out below the
> bottom of the airplane assuming there's no carbon graphite in that
> section of the airplane and assuming there's no paint that has some
> kind of chromate based material then my question is would the antenna
> be able to still receive the ground-based signals?
>
> To add to my confusion I will also be running a Garmin gtn - 650 and
> it is supposed to be able to receive ADS-B signals. . Should I
> purchase an additional monopole antenna for that unit as well or
> should I just run with the dynon unit?
>
> Subject is way out of my league so any help from you or some of the
> other sharp guys on this forum would be greatly helpful!
>
> THANKS AGAIN FOR YOUR HELP!!!
>
> Bill Hunter
>
> On May 22, 2016 6:30 PM, "user9253" <fransew@gmail.com
> <mailto:fransew@gmail.com>> wrote:
>
> <fransew@gmail.com <mailto:fransew@gmail.com>>
>
> Assuming that you are installing the SV-XPNDR-261, why not use the
> existing transponder antenna? Since the original transponder worked
> OK with that egg shaped ground plane, that reinforces my post that
> shape and size makes a theoretical difference, but is not critical
> in real life.
> The SV-ADSB-470 antenna is receive only. It will not affect the
> operation of ADAHRS or Magnetometer. Keep the ADSB-470 antenna away
> from other transmitting antennas, especially the transponder antenna.
> The SV-ADSB-470 receives 978 only, not 1090. If you are out of
> range of an ADS-B ground station (maybe in a traffic pattern), you
> will not see traffic transmitting ADS-B out on 1090, i.e., other
> SkyView transponders. Dynon needs to offer a dual band ADS-B receiver.
>
> --------
> Joe Gores
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=456477#456477
>
>
> ==========
> -
> Electric-List" rel="noreferrer"
> target="_blank">http://www.matronics.com/Navigator?AeroElectric-List
> ==========
> FORUMS -
> eferrer" target="_blank">http://forums.matronics.com
> ==========
> WIKI -
> errer" target="_blank">http://wiki.matronics.com
> ==========
> b Site -
> -Matt Dralle, List Admin.
> rel="noreferrer" target="_blank">http://www.matronics.com/contribution
> ==========
>
>
Message 4
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| Subject: | Re: Transponder and ADS Antenna Mounting Location |
Questions For
There are two prime issues here . . . antenna performance with
respect to ground plane which is easily addressed by
reciting the physics behind the idea of ground plane.
(1) If your antenna is hanging out in the breeze or perhaps
located on top of a mast, there is no practical way to
provide the ultimate in ground planes . . . conductive
material radiating out from the base all the way to
the horizon.
Experience and measurement has demonstrated that a
artificial plane fabricated of 'radials' can be a useful
alternative to the acme of grounds . . . 4 or more RESONANT
radials at the base of the antenna. More that 4 can be
expanded upon to be an 'infinite' number of radials whereupon
you have generated a solid disk with a radius equal to
the height of the antenna.
Yes, there ARE proximity effects for location of the
antenna on unsymmetrical grounds . . . but you have
to go into an RF lab with REALLY good equipment to
identify/measure the effects.
On a composite airplane, mount it on the disk. On
a metal airplane, mount it to the skin . . . anywhere
pending other issues wrapped up on proximity to
a strong radiated signal . . . the transponder.
(2) ADSB receivers are listening to 100+ watt
digital signals from transmitters in line of sight
and 10 miles or less distant. That is a HUGE signal
compared to looking for a 25w marker beacon 50 miles
away and perhaps over the horizon.
A wet string hung under the fuselage would probably
do must fine in terms of performance for receiving
ADSB squitter. KISS . . . disk of aluminum with a
legacy monopole is cheap, easy, works good, lasts a
long time.
Bob . . .
Message 5
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| Subject: | Infinity Aero Grip and Starter Switch |
> Better yet . . . don't do that. Probably a million
airplanes have been produced were the starter controls
were NOT on the stick . . . or anywhere else that
could be inadvertently operated . . .that issue
has never bubbled up as a human-factors 'problem'
to be fixed.
Hmmm=85good advice. I did think the idea was a bit odd. Better go back
to
the old push button=85I might could use that button for another
purpose=85what
do you think about using it for the ejection seat or drag chute features
I
am incorporating=85what could possibly go wrong?!?!?
THANKS Bob and All for your kind feedback/suggestions!!!
..
Cheers!!!
Bill Hunter
408-464-1902
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
Robert L.
Nuckolls, III
Sent: Monday, May 23, 2016 7:27 AM
Subject: Re: AeroElectric-List: Infinity Aero Grip and Starter Switch
At 12:25 AM 5/23/2016, you wrote:
I work next door to a radio shop and since I=C2 have an experiental=C2 I
hear
all the experimental gripes. Recently they were doing radio work=C2 on
an RV.
The builder put a=C2 starter switch on the stick. It was unmarked and
they
inadvertently pushed it, with nearly disastrous results. Sorry I don't
mean
to change subjects but please make sure it's well marked and obvious--ya
never know who's gonna push what buttons.=C2
Better yet . . . don't do that. Probably a million
airplanes have been produced were the starter controls
were NOT on the stick . . . or anywhere else that
could be inadvertently operated . . .that issue
has never bubbled up as a human-factors 'problem'
to be fixed.
But more importantly, the FURTHER your airplane
departs from historic configurations, the greater
the risk for bad results from common assumptions.
Bob . . .
Message 6
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| Subject: | Re: Transponder and ADS Antenna Mounting Location |
Questions For
Go with the minimum disk on the receiving antenna and leave the existing
alone, it probably is working and has been tested. If my metric
calculator and decimal point placer are working today, that would be
about a 5" diam alum foil disk. Given the antenna length, probably
double what is actually needed.
On 5/23/2016 7:35 AM, William Hunter wrote:
>
> THANKS Kelly!!!
>
>> What you have is the Dynon(Trig) SV-261 transponder, which is the Out unit on
1090-ES. This should be connected to your existing monopole transponder antenna.
>
> Yes. My existing monopole antenna is attached to the "corner" (edge) of the
existing egg shaped ground plane. I really want to get this ground plane issue
squared away (sorry could not resist).
>
> My question is what is the best size and shape for this transponder monopole
antenna? The Dynon manuals says 120 MM X 120 MM is minimum and 700 MM X 700 MM
is best but way too big for my airplane. Then it says intervals of wave length
distance "should be avoided" however what are the intermediate steps that are
best and what should be avoided?
>
>> Then you have the SV-470 ADS-B Receiver or In unit. It needs the same variety
antenna, but not a ground plane, and can be anywhere that is at least 2 ft away
from your existing transponder antenna.
>
> Yes. Reading the Dynon manual it says to make sure there is a ground plane
>
> Same question as above... What are the intervals that the ADSB ground plane should
be?
> 130 MM X 130 MM is minimum and their best size is 780 MM X 780 MM but that is
too big for my airplane...and intermediate steps are bad so what are the intermediate
steps that are best and what should be avoided?
>
>> Do not get confused about the GTN-650. It is a GPS/Nav/Com unit that does NOT
receive any ADS-B or other traffic information on its own. It is only able to
display information received by your transponder or ADS-B In unit.
>
> Good call Kelly...I did not gather that fine point.
>
> THANKS AGAIN!!!!
>
>
> ..
>
> Cheers!!!
>
> Bill Hunter
>
>
> -----Original Message-----
> From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Kelly McMullen
> Sent: Monday, May 23, 2016 6:24 AM
> To: aeroelectric-list@matronics.com
> Subject: Re: AeroElectric-List: Re: Transponder and ADS Antenna Mounting Location
Questions For
>
> --> <kellym@aviating.com>
>
> I think you are confusing yourself with too much information. What you have is
the Dynon(Trig) SV-261 transponder, which is the Out unit on 1090-ES. This should
be connected to your existing monopole transponder antenna. Then you have
the SV-470 ADS-B Receiver or In unit. It needs the same variety antenna, but
not a ground plane, and can be anywhere that is at least 2 ft away from your
existing transponder antenna.
> Do not get confused about the GTN-650. It is a GPS/Nav/Com unit that does NOT
receive any ADS-B or other traffic information on its own. It is only able to
display information received by your transponder or ADS-B In unit.
> I have the same equipment in my RV-10. My transponder antenna is a short distance
behind the firewall on the belly. My ADS-B receiver antenna is on the belly
in the tailcone. I realize with a canard, your convenient locations are different...just
get the distance you need. Under the Canard should be fine, if you
can get the distance and easy mounting.
>
> On 5/22/2016 9:56 PM, William Hunter wrote:
>> Joe,
>>
>> This is really valuable information. Sounds like you know your stuff
>> so if I could kindly pick a bit more of your brain
>>
>> I am running the SV-XPNDR-260 and it is supposed to be the
>> higher-powered transponder that dynon offers I'm running the dynon
>> ADDB receiver for traffic.
>>
>> The ideal location for convenience of installation would be to install
>> the monopole antenna directly underneath the Canard. If I installed
>> it like I am thinking then the monopole antenna would be sticking down
>> from the Cunard and since the Canard is mounted up high in the nose
>> cone of the airplane the antenna would not be sticking out below the
>> bottom of the airplane assuming there's no carbon graphite in that
>> section of the airplane and assuming there's no paint that has some
>> kind of chromate based material then my question is would the antenna
>> be able to still receive the ground-based signals?
>>
>> To add to my confusion I will also be running a Garmin gtn - 650 and
>> it is supposed to be able to receive ADS-B signals. . Should I
>> purchase an additional monopole antenna for that unit as well or
>> should I just run with the dynon unit?
>>
>> Subject is way out of my league so any help from you or some of the
>> other sharp guys on this forum would be greatly helpful!
>>
>> THANKS AGAIN FOR YOUR HELP!!!
>>
>> Bill Hunter
>>
>> On May 22, 2016 6:30 PM, "user9253" <fransew@gmail.com
>> <mailto:fransew@gmail.com>> wrote:
>>
>> <fransew@gmail.com <mailto:fransew@gmail.com>>
>>
>> Assuming that you are installing the SV-XPNDR-261, why not use the
>> existing transponder antenna? Since the original transponder worked
>> OK with that egg shaped ground plane, that reinforces my post that
>> shape and size makes a theoretical difference, but is not critical
>> in real life.
>> The SV-ADSB-470 antenna is receive only. It will not affect the
>> operation of ADAHRS or Magnetometer. Keep the ADSB-470 antenna away
>> from other transmitting antennas, especially the transponder antenna.
>> The SV-ADSB-470 receives 978 only, not 1090. If you are out of
>> range of an ADS-B ground station (maybe in a traffic pattern), you
>> will not see traffic transmitting ADS-B out on 1090, i.e., other
>> SkyView transponders. Dynon needs to offer a dual band ADS-B receiver.
>>
>> --------
>> Joe Gores
>>
>>
>>
>>
>> Read this topic online here:
>>
>> http://forums.matronics.com/viewtopic.php?p=456477#456477
>>
>>
>>
>>
>>
>>
>>
>> ==========
>> -
>> Electric-List" rel="noreferrer"
>> target="_blank">http://www.matronics.com/Navigator?AeroElectric-List
>> ==========
>> FORUMS -
>> eferrer" target="_blank">http://forums.matronics.com
>> ==========
>> WIKI -
>> errer" target="_blank">http://wiki.matronics.com
>> ==========
>> b Site -
>> -Matt Dralle, List Admin.
>> rel="noreferrer" target="_blank">http://www.matronics.com/contribution
>> ==========
>>
>>
>>
>
>
Message 7
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| Subject: | Re: Transponder and ADS Antenna Mounting Location |
Questions For
Wow.this inherent anal retentive desire I have to "do it right the first
time" is a real pain in the butt!!!
>A wet string hung under the fuselage would probably do must fine in terms
of performance for receiving ADSB squitter. KISS . . . disk of aluminum with
a legacy monopole is cheap, easy, works good, lasts a long time.>
The Dynon manual sure made a big deal about the EXACT size and shape of the
antenna in a composite.I was thinking that an aluminum airplane would
certainly not be the exact size and shape.
Anyhoo.Bob to confirm your communication before I start cutting and gluing.
With respect to the ADS-B antenna.I would like to mount it under the canard
essentially in the nose compartment wheel well area.do you suppose this
would work? What size should the aluminum ground plane be? Disk or square
or egg shaped?!?!
With respect to the transponder antenna pointed down below the airplane
(location under the back seat).should I get rid of the current egg shaped
ground plane or leave it as is?
This is just like being married.I tell my wife.just tell me what to do and I
will do it.I don't have to think that way!!!
..
Cheers!!!
Bill Hunter
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L.
Nuckolls, III
Sent: Monday, May 23, 2016 7:38 AM
Subject: Re: AeroElectric-List: Re: Transponder and ADS Antenna Mounting
Location Questions For
There are two prime issues here . . . antenna performance with
respect to ground plane which is easily addressed by
reciting the physics behind the idea of ground plane.
(1) If your antenna is hanging out in the breeze or perhaps
located on top of a mast, there is no practical way to
provide the ultimate in ground planes . . . conductive
material radiating out from the base all the way to
the horizon.
Experience and measurement has demonstrated that a
artificial plane fabricated of 'radials' can be a useful
alternative to the acme of grounds . . . 4 or more RESONANT
radials at the base of the antenna. More that 4 can be
expanded upon to be an 'infinite' number of radials whereupon
you have generated a solid disk with a radius equal to
the height of the antenna.
Yes, there ARE proximity effects for location of the
antenna on unsymmetrical grounds . . . but you have
to go into an RF lab with REALLY good equipment to
identify/measure the effects.
On a composite airplane, mount it on the disk. On
a metal airplane, mount it to the skin . . . anywhere
pending other issues wrapped up on proximity to
a strong radiated signal . . . the transponder.
(2) ADSB receivers are listening to 100+ watt
digital signals from transmitters in line of sight
and 10 miles or less distant. That is a HUGE signal
compared to looking for a 25w marker beacon 50 miles
away and perhaps over the horizon.
A wet string hung under the fuselage would probably
do must fine in terms of performance for receiving
ADSB squitter. KISS . . . disk of aluminum with a
legacy monopole is cheap, easy, works good, lasts a
long time.
Bob . . .
Message 8
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| Subject: | Re: Transponder and ADS Antenna Mounting Location |
Questions For
Well, to some degree that is what experimental is about. Your
transponder will need to be tested on the aircraft to meet the every two
years requirement. That will show whether the signal meets requirements
or not. You are sending around 200-250 watts up to perhaps 100nm for
radar sites, less for ADS-B ground receivers. Compared to your com
transmitter of 8-10 watts.
As for your ADS-B receiver, you still want the antenna to have line of
site view of transmitters, so you want it exposed on the belly, not up
in a wheel well. Is there space right under the canard? Is the canard
removable like on the Long EZ models?
On 5/23/2016 7:57 AM, William Hunter wrote:
> Wowthis inherent anal retentive desire I have to do it right the first
> time is a real pain in the butt!!!
>
>
> With respect to the ADS-B antennaI would like to mount it under the
> canard essentially in the nose compartment wheel well areado you
> suppose this would work? What size should the aluminum ground plane
> be? Disk or square or egg shaped?!?!
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| Subject: | Re: Transponder and ADS Antenna Mounting Location Questions |
For
I agree with Kelly. Connect the SV-261 transponder to the existing transponder
antenna. If the previous transponder worked with that ground plane, then the
new one will too. If you insist on making a new transponder ground plane, then
120 -130 mm square or round will be fine.
As for the ADSB-470 receiver, mount the antenna with or without a ground plane
anywhere you want, inside or outside, where it is 2 or more feet away from the
transponder antenna. Like Bob said, the signal from the ground station or
nearby aircraft will be so strong that a perfect receiving antenna is not required.
Both the SV-261 and the ADSB-470 are ADS-B. One is OUT and one is IN.
Do you also have the SV-GPS-2020?
After your plane is flying with the new system, you can go flying and then request
a report from the government to see if your transponder meets 2020 requirements.
See this article:
http://macsblog.com/2015/01/the-faa-likes-my-ads-b-out-performance/
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=456505#456505
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| Subject: | Re: Transponder and ADS Antenna Mounting Location |
Questions For
Hi all, thank you so much for your help it is greatly appreciated.
>Do you also have the SV-GPS-2020
I did not get the dynon GPS 2020 because the Garmin has a GPS that is
supposed to be 2020 compliant and it is connected to the arinc bus and that
communicates all of the magic to the dynon Skyview system and that
apparently makes everything legal.
Thanks again for your help!
Bill Hunter
On May 23, 2016 10:47 AM, "user9253" <fransew@gmail.com> wrote:
>
> I agree with Kelly. Connect the SV-261 transponder to the existing
> transponder antenna. If the previous transponder worked with that ground
> plane, then the new one will too. If you insist on making a new
> transponder ground plane, then 120 -130 mm square or round will be fine.
> As for the ADSB-470 receiver, mount the antenna with or without a ground
> plane anywhere you want, inside or outside, where it is 2 or more feet away
> from the transponder antenna. Like Bob said, the signal from the ground
> station or nearby aircraft will be so strong that a perfect receiving
> antenna is not required.
> Both the SV-261 and the ADSB-470 are ADS-B. One is OUT and one is IN.
> Do you also have the SV-GPS-2020?
> After your plane is flying with the new system, you can go flying and
> then request a report from the government to see if your transponder meets
> 2020 requirements. See this article:
> http://macsblog.com/2015/01/the-faa-likes-my-ads-b-out-performance/
>
> --------
> Joe Gores
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=456505#456505
>
>
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| Subject: | Re: Transponder and ADS Antenna Mounting Location |
Questions For
There are two prime issues here . . . antenna performance with
respect to ground plane which is easily addressed by
reciting the physics behind the idea of ground plane.
(1) If your antenna is hanging out in the breeze or perhaps
located on top of a mast, there is no practical way to
provide the ultimate in ground planes . . . conductive
material radiating out from the base all the way to
the horizon.
Experience and measurement has demonstrated that a
artificial plane fabricated of 'radials' can be a useful
alternative to the acme of grounds . . . 4 or more RESONANT
radials at the base of the antenna. More that 4 can be
expanded upon to be an 'infinite' number of radials whereupon
you have generated a solid disk with a radius equal to
the height of the antenna.
Yes, there ARE proximity effects for location of the
antenna on unsymmetrical grounds . . . but you have
to go into an RF lab with REALLY good equipment to
identify/measure the effects.
On a composite airplane, mount it on the disk. On
a metal airplane, mount it to the skin . . . anywhere
pending other issues wrapped up on proximity to
a strong radiated signal . . . the transponder.
(2) ADSB receivers are listening to 100+ watt
digital signals from transmitters in line of sight
and 10 miles or less distant. That is a HUGE signal
compared to looking for a 25w marker beacon 50 miles
away and perhaps over the horizon.
A wet string hung under the fuselage would probably
do must fine in terms of performance for receiving
ADSB squitter. KISS . . . disk of aluminum with a
legacy monopole is cheap, easy, works good, lasts a
long time.
Bob . . .
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