Today's Message Index:
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1. 04:40 AM - Re: Fw: Portable Transponder (Jesse Kluijfhout, PE1RUI)
2. 05:37 AM - ELT Antenna ()
3. 07:04 PM - Re: ELT Antenna ()
Message 1
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Subject: | Re: Fw: Portable Transponder |
I would suggest to use an external antenna with a good groundplane.
It doubt the VSWR is very good the way when it is directly connected
(however Trig products will give an error when the VSWR is very high).
Another point to think of is the high peak power that a transponder is
transmitting (about 125 or 250 Watt depending on class) The pulse
duration is only short, lowering the average power. My transponder test
equipement suggest to take a distance of at least to meter to reduce
field strength your exposed to during transponder field testing.
When
the antenna is directly on the unit you will be likely close to the
antenna. Some scientist say that exposure to high level RF fields is not
dangerous, while other doubt this, I think it is better to take some
distance from the antenna to reduce the field strength at your seating
position.
Jesse
Message 2
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3/23/2012
Hello Noel Loveys, Thank you for your inputs on this subject, but in the
interest of stamping out hearsay, gossip, and rumors regarding experimental
amateur built aircraft I'd like to point out that some of your comments are
just not applicable in the USA.
The following statements that you wrote are not correct in the USA:
1) "In that case if even on an OBAM aircraft the ELT and transponder must be
installed or signed off by a certified AME (Canada) or A&P (U.S.)"
2) "One of the things I do not like about the new ELT is that aircraft
cannot
borrow another ELT while one is out having scheduled service done."
3) "...so they wouldn't have to fly without one... Which is legal for up to
90
days."
Note that the regulatory requirements for having an ELT in a US registered
civil aircraft operating in the US, and the circumstances permitted for
flying without an ELT installed, are contained in 14 CFR 91.207. That
section is too long and complicated to be copied, or even extracted in this
posting. It may be accessed here:
http://ecfr.gpoaccess.gov/cgi/t/text/text-idx?c=ecfr&sid=e13e8f64d66f124a79dbd562cbe93f0b&rgn=div8&view=text&node=14:2.0.1.3.10.3.7.4&idno=14
4) "In fact even a licensed AME is not allowed to change the batteries on an
ELT
it has to be done by an approved Avionics tech or an approved avionics
shop."
5) "Amateur built aircraft are another quintal of fish... They don't even
have
to carry an ELT."
They do in the USA in accordance with 14 CFR 91.207.
Thanks for your help in posting accuracy.
'OC' Baker Says: "The best investment we can make is the time and effort to
gather and understand knowledge."
=============================================================
Time: 11:11:14 AM PST US
From: "Noel Loveys" <noelloveys@yahoo.ca>
Subject: RE: AeroElectric-List: ELT Antenna
In that case if even on an OBAM aircraft the ELT and transponder must be
installed or signed off by a certified AME (Canada) or A&P (U.S.)
Noel
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Kelly
McMullen
Sent: March 21, 2012 8:26 PM
Subject: RE: AeroElectric-List: ELT Antenna
The minimum for use of ELTs is to demonstrate that the complete system meets
the TSO. Good luck with doing that with a roll your own antenna of unknown
impedance and SWR. ELTs and transponders are two items on OBAM aircraft that
must comply with the TSO.
Noel wrote:
It sure would be... but for amateur aircraft you might be able to use your
own antenna.
Noel
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Ed
Holyoke
Sent: March 20, 2012 10:18 PM
Subject: Re: AeroElectric-List: ELT Antenna
Have to look at your ELT installation instructions. The ELT is TSOed and
might require that you use their antenna.
=========================================================
Time: 06:36:13 PM PST US
From: "Noel Loveys" <noelloveys@yahoo.ca>
Subject: RE: AeroElectric-List: ELT Antenna
In this country any appliance on a certified aircraft with certain
exceptions has to be installed by or checked by a certified AME ( aircraft
maintenance engineer ) and the installation has to be documented in the
airframe log book and noted if there is a separate log book for the
appliance.
One of the things I do not like about the new ELT is that aircraft cannot
borrow another ELT while one is out having scheduled service done. In the
past the AMO I worked for had a "loaner" ELT that we would put in aircraft
so they wouldn't have to fly without one... Which is legal for up to 90
days.
In fact even a licensed AME is not allowed to change the batteries on an ELT
it has to be done by an approved Avionics tech or an approved avionics shop.
Amateur built aircraft are another quintal of fish... They don't even have
to carry an ELT. Mind I don't know anyone who is stupid enough to fly this
land without one.
Noel
Message 3
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3/23/2012
Hello Noel, Thank you for your most courteous reply. You wrote: "New 406
mHz. ELTs are identified to specific aircraft in specific configuration."
This is a very important point that you make. Each of those ELT's is also
identified to a specific Owner/Operator of that specific aircraft and to a
specific Primary and Alternate 24-Hour Emergency Contact associated with
that specific ELT and aircraft along with communication information for all
of those individuals. See here:
http://www.nmea.org/Assets/elt%20406%20registration%20and%20renewal.pdf
The purpose of that contact information is to permit rapid communication
with one of those individuals should an emergency signal be received by a
satellite to confirm that the signal is not a false alarm.
Also note that it is possible on that form to submit a Change of ELT
Information or Ownership and to do it fairly quickly online at:
www.beaconregistration.noaa.gov
This would permit a fairly flexible and timely means of swapping a 406 Mhz
ELT from one aircraft to another if that became a need and one complied with
all provisions of the registration requirements.
'OC' Baker Says: "The best investment we can make is the time and effort to
gather and understand knowledge."
===================================================
From: "Noel Loveys" <noelloveys@yahoo.ca>
Sent: Friday, March 23, 2012 2:35 PM
Subject: RE: ELT Antenna
> My apologies sometimes I forget that most people on the lists are not
> Canadian and there are several differences in our aviation procedures.
>
> In Canada an aircraft flown commercially must have an ELT on board.
> However
> I'm not sure it has to be turned on. An ELT may be removed for servicing
> for up to 90 days.
>
> New 406 mHz. ELTs are identified to specific aircraft in specific
> configuration. One of the new ELT cannot be taken out of one aircraft and
> put in another. The identifier code on the ELT is "Married "to a specific
> airplane. My understanding is if a large plane is converted from
> passenger
> to cargo it must be refitted with a new ELT as there is no vehicle to do
> this.
>
> I do like to keep up with what is going on south of the 49th so I will
> have
> a look through your link and at the same time I'll have another look
> through
> CARs, Canada's equivalent to FARs.
>
> Thank you.
>
> Noel
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