The Murphy Builders Site

Posted: **Fri Feb 17, 2012 11:28 pm**

Where to mount the antenna? The antenna's I have seen look like a 3" 1/8" steal wire with a small ball-bearing on the end. I am thinking of mounting it in my wing tip to prevent it from getting caught in grass. The other alternative is the belly, but as I mentioned grass and such could catch on it. Anyone have any thoughts or know what the RV people do?

-------Original Message-------
From: Ralph Baker <rebaker@ftc-i.net>
Sent: 08/18/03 05:07 AM
To: murphy-rebel@dcsol.com
Subject: transponders

Mike,

In the US a transponder allows you to utilize the ATC system for flight
following while VFR on a "space available" basis (most of the time).
That is a major safety enhancement with traffic advisories at low cost
and hassle.
Ralph
Baker

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Posted: **Fri Feb 17, 2012 11:28 pm**

The small steel antenna that you've described is probably the most common
and certainly cheapest transponder unit but not the only one available.
There are also blade type antennas for the same use. Two issues that might
affect your wingtip idea; My understanding is that this system is 'line of
sight', meaning that you might lose radar contact when the fuselage is
between the radar station. Another is the need for a good ground plane.
Mounting on the wingtip will require you to build a ground plane. I'm
gonna put mine on the belly, about a foot aft of the gear legs.

Exactly how long is the grass where you're gonna land? What's the prop
gonna look like after cutting that hay? In all seriousness, the belly seems
to be universally accepted.

FWIW, Bob seems to be more of a rebel than me. Either that, or the Canadian
airspace is much more relaxed than down here. Traveling whenever and where
ever you want is much easier with a transponder. I, too, kinda like the
safety factor, besides, I'm based out of a Class C airport. No choice here.

Bill Delcambre

----- Original Message -----
From: <rickhm@mindspring.com>
To: <murphy-rebel@dcsol.com>
Sent: Monday, August 18, 2003 10:41 AM
Subject: transponders antenna location, was Transponder

Where to mount the antenna? The antenna's I have seen look like a 3" 1/8"

steal wire with a small ball-bearing on the end. I am thinking of mounting
it in my wing tip to prevent it from getting caught in grass. The other
alternative is the belly, but as I mentioned grass and such could catch on
it. Anyone have any thoughts or know what the RV people do?

-------Original Message-------
From: Ralph Baker <rebaker@ftc-i.net>
Sent: 08/18/03 05:07 AM
To: murphy-rebel@dcsol.com
Subject: transponders

Mike,
In the US a transponder allows you to utilize the ATC system for flight
following while VFR on a "space available" basis (most of the time).
That is a major safety enhancement with traffic advisories at low cost
and hassle.
Ralph
Baker

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Posted: **Fri Feb 17, 2012 11:28 pm**

Bill,

Thanks for the thoughts. I wondered if it was a line of sight system. Made sense given its function. No the grass isn't THAT long! Yes I understand your comments about airspace. I live under the 30 mile vail of Denver International, so like you I don't have a choice if I am going to get around much.

THanks again.

Rick Muller

SR60
-------Original Message-------
From: Bill Delcambre <bdelcambre@cox-internet.com>
Sent: 08/18/03 08:03 AM
To: murphy-rebel@dcsol.com
Subject: Re: transponders antenna location, was Transponder

The small steel antenna that you've described is probably the most common

and certainly cheapest transponder unit but not the only one available.
There are also blade type antennas for the same use. Two issues that
might
affect your wingtip idea; My understanding is that this system is 'line
of
sight', meaning that you might lose radar contact when the fuselage is
between the radar station. Another is the need for a good ground plane.
Mounting on the wingtip will require you to build a ground plane. I'm
gonna put mine on the belly, about a foot aft of the gear legs.

Exactly how long is the grass where you're gonna land? What's the prop
gonna look like after cutting that hay? In all seriousness, the belly
seems
to be universally accepted.

FWIW, Bob seems to be more of a rebel than me. Either that, or the
Canadian
airspace is much more relaxed than down here. Traveling whenever and
where
ever you want is much easier with a transponder. I, too, kinda like the
safety factor, besides, I'm based out of a Class C airport. No choice
here.

Bill Delcambre

----- Original Message -----
From: <rickhm@mindspring.com>
To: <murphy-rebel@dcsol.com>
Sent: Monday, August 18, 2003 10:41 AM
Subject: transponders antenna location, was Transponder

Where to mount the antenna? The antenna's I have seen look like a 3"

1/8"
steal wire with a small ball-bearing on the end. I am thinking of
mounting
it in my wing tip to prevent it from getting caught in grass. The other
alternative is the belly, but as I mentioned grass and such could catch on
it. Anyone have any thoughts or know what the RV people do?

-------Original Message-------
From: Ralph Baker <rebaker@ftc-i.net>
Sent: 08/18/03 05:07 AM
To: murphy-rebel@dcsol.com
Subject: transponders

Mike,
In the US a transponder allows you to utilize the ATC system for flight
following while VFR on a "space available" basis (most of the time).
That is a major safety enhancement with traffic advisories at low cost
and hassle.
Ralph

Baker
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Posted: **Fri Feb 17, 2012 11:28 pm**

The stick and ball antennas are relatively cheap $35.00, but are easily
damaged. (usually when washing the airplane) I prefer the blade type but
they cost about $100.00. They are almost indestructible. (they do not
survive a gear up landing in a retractable aircraft)
George Coy

-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com]On Behalf Of
rickhm@mindspring.com
Sent: Monday, August 18, 2003 4:48 PM
To: murphy-rebel@dcsol.com
Subject: Re: Re: transponders antenna location, was Transponder

Bill,

Thanks for the thoughts. I wondered if it was a line of sight system.
Made sense given its function. No the grass isn't THAT long! Yes I
understand your comments about airspace. I live under the 30 mile vail of
Denver International, so like you I don't have a choice if I am going to get
around much.

THanks again.

Rick Muller

SR60
-------Original Message-------
From: Bill Delcambre <bdelcambre@cox-internet.com>
Sent: 08/18/03 08:03 AM
To: murphy-rebel@dcsol.com
Subject: Re: transponders antenna location, was Transponder

The small steel antenna that you've described is probably the most common

and certainly cheapest transponder unit but not the only one available.
There are also blade type antennas for the same use. Two issues that
might
affect your wingtip idea; My understanding is that this system is 'line
of
sight', meaning that you might lose radar contact when the fuselage is
between the radar station. Another is the need for a good ground plane.
Mounting on the wingtip will require you to build a ground plane. I'm
gonna put mine on the belly, about a foot aft of the gear legs.

Exactly how long is the grass where you're gonna land? What's the prop
gonna look like after cutting that hay? In all seriousness, the belly
seems
to be universally accepted.

FWIW, Bob seems to be more of a rebel than me. Either that, or the
Canadian
airspace is much more relaxed than down here. Traveling whenever and
where
ever you want is much easier with a transponder. I, too, kinda like the
safety factor, besides, I'm based out of a Class C airport. No choice
here.

Bill Delcambre

----- Original Message -----
From: <rickhm@mindspring.com>
To: <murphy-rebel@dcsol.com>
Sent: Monday, August 18, 2003 10:41 AM
Subject: transponders antenna location, was Transponder

Where to mount the antenna? The antenna's I have seen look like a 3"

1/8"
steal wire with a small ball-bearing on the end. I am thinking of
mounting
it in my wing tip to prevent it from getting caught in grass. The other
alternative is the belly, but as I mentioned grass and such could catch on
it. Anyone have any thoughts or know what the RV people do?

-------Original Message-------
From: Ralph Baker <rebaker@ftc-i.net>
Sent: 08/18/03 05:07 AM
To: murphy-rebel@dcsol.com
Subject: transponders

Mike,
In the US a transponder allows you to utilize the ATC system for flight
following while VFR on a "space available" basis (most of the time).
That is a major safety enhancement with traffic advisories at low cost
and hassle.
Ralph

Baker
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Posted: **Fri Feb 17, 2012 11:28 pm**

----- Original Message -----
From: <rickhm@mindspring.com>
To: <murphy-rebel@dcsol.com>
Sent: Monday, August 18, 2003 11:41 AM
Subject: transponders antenna location, was Transponder

Where to mount the antenna? The antenna's I have seen look like a 3" 1/8"

steal wire with a small ball-bearing on the end. I am thinking of mounting
it in my wing tip to prevent it from getting caught in grass. The other
alternative is the belly, but as I mentioned grass and such could catch on
it. Anyone have any thoughts or know what the RV people do?

-------Original Message-------
From: Ralph Baker <rebaker@ftc-i.net>
Sent: 08/18/03 05:07 AM
To: murphy-rebel@dcsol.com
Subject: transponders

Mike,
In the US a transponder allows you to utilize the ATC system for flight
following while VFR on a "space available" basis (most of the time).
That is a major safety enhancement with traffic advisories at low cost
and hassle.
Ralph
Baker

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Posted: **Fri Feb 17, 2012 11:28 pm**

Well, for $100 you would think they would be more resilient :-) Thanks for
the thought. I will look into blades, etc. Nothing worse than getting a
call from a controller indicating they can't see you!

Rick
SR70

-----Original Message-----
From: George Coy [SMTP:george@gesoco.com]
Sent: Monday, August 18, 2003 4:20 PM
To: murphy-rebel@dcsol.com
Subject: RE: Re: transponders antenna location, was Transponder

The stick and ball antennas are relatively cheap $35.00, but are easily
damaged. (usually when washing the airplane) I prefer the blade type but
they cost about $100.00. They are almost indestructible. (they do not
survive a gear up landing in a retractable aircraft)
George Coy

-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com]On Behalf Of
rickhm@mindspring.com
Sent: Monday, August 18, 2003 4:48 PM
To: murphy-rebel@dcsol.com
Subject: Re: Re: transponders antenna location, was Transponder

Bill,

Thanks for the thoughts. I wondered if it was a line of sight system.
Made sense given its function. No the grass isn't THAT long! Yes I
understand your comments about airspace. I live under the 30 mile vail of
Denver International, so like you I don't have a choice if I am going to
get
around much.

THanks again.

Rick Muller

SR60
-------Original Message-------
From: Bill Delcambre <bdelcambre@cox-internet.com>
Sent: 08/18/03 08:03 AM
To: murphy-rebel@dcsol.com
Subject: Re: transponders antenna location, was Transponder

The small steel antenna that you've described is probably the most common

and certainly cheapest transponder unit but not the only one available.
There are also blade type antennas for the same use. Two issues that
might
affect your wingtip idea; My understanding is that this system is 'line
of
sight', meaning that you might lose radar contact when the fuselage is
between the radar station. Another is the need for a good ground plane.
Mounting on the wingtip will require you to build a ground plane. I'm
gonna put mine on the belly, about a foot aft of the gear legs.

Exactly how long is the grass where you're gonna land? What's the prop
gonna look like after cutting that hay? In all seriousness, the belly
seems
to be universally accepted.

FWIW, Bob seems to be more of a rebel than me. Either that, or the
Canadian
airspace is much more relaxed than down here. Traveling whenever and
where
ever you want is much easier with a transponder. I, too, kinda like the
safety factor, besides, I'm based out of a Class C airport. No choice
here.

Bill Delcambre

----- Original Message -----
From: <rickhm@mindspring.com>
To: <murphy-rebel@dcsol.com>
Sent: Monday, August 18, 2003 10:41 AM
Subject: transponders antenna location, was Transponder

Where to mount the antenna? The antenna's I have seen look like a 3"

1/8"
steal wire with a small ball-bearing on the end. I am thinking of
mounting
it in my wing tip to prevent it from getting caught in grass. The other
alternative is the belly, but as I mentioned grass and such could catch on
it. Anyone have any thoughts or know what the RV people do?

-------Original Message-------
From: Ralph Baker <rebaker@ftc-i.net>
Sent: 08/18/03 05:07 AM
To: murphy-rebel@dcsol.com
Subject: transponders

Mike,
In the US a transponder allows you to utilize the ATC system for flight
following while VFR on a "space available" basis (most of the time).
That is a major safety enhancement with traffic advisories at low cost
and hassle.
Ralph

Baker
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Posted: **Fri Feb 17, 2012 11:28 pm**

I've got the short metal antenna with the ball end ,center mounted just aft
of the gear on the belly of TUJ.As per George's comment the only damage has
occurred during the washing process.And we do get into unimproved areas
where the vegetation is high.I would not be without a transponder for a
number of reasons not the least which is the ease of international travel.It
is hard to put a price on the peace of mind that comes from transponder
exact flight following through "sparsely settled area".As well you are
quickly expedited through controlled areas where non-mode-C might not be
welcome especially if the controllers are slightly harried.This can be
important for routing due to fuel or weather considerations.I just had my
pitot static system recertifyed again,24 months,Brant Aero, around
$200Cdn.and they found my VSI was quite inaccurate,a good thing to know.I
have just returned from flying an AgCat on a job in Northern Ontario about
85 miles south of James Bay,I flew the Rebel up and back.The longest stretch
with no anything (meaning no logging road or rail line)but bush is about 150
miles,love the transponder.
As an aside,Saturday after I came down from the northern bush I was able to
return from Timmins to St.Thomas non-stop in 3.7hrs burning 115liters,about
8.2USG per/hr.A wonderful flight,it was a relaxing ,fulfilling experience to
enjoy the scenery,eat my snacks see the moose and bears and experience the
landscape and have the comfort and confidence in the Rebel...Angus

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