Today's Message Index:
----------------------
1. 02:10 AM - Re: ELT: 406 vs 121.5 (D L Josephson)
2. 04:56 AM - Re: one-wire alternators- the subject that just won't die (Bill Boyd)
3. 12:56 PM - Re: Re: ELT: 406 vs 121.5 (B Tomm)
4. 04:25 PM - Re: Re: ELT: 406 vs 121.5 (Tim Andres)
5. 04:43 PM - Z-19 Symbol Question (Justin Jones)
6. 09:35 PM - Re: Re: ELT: 406 vs 121.5 (Kelly McMullen)
7. 10:00 PM - apple charger circuit (rayj)
Message 1
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| Subject: | Re: ELT: 406 vs 121.5 |
First, keep in mind that 406 MHz ELTs are *also* 121.5 MHz ELTs, so
existing monitoring on 121.5 is not going to go away any time soon. FCC
announced around five years ago that they were planning to ban
manufacture and use of 121.5/243 ELTs, but gave up when AOPA and FAA
asked them not to do that. FCC will not approve any new 121.5/243 MHz
ELT transmitter designs but existing models can still be made, sold and
installed.
There are three TSOs that apply to ELTs. The early ones like the
original Narco ELT-10 meet TSO C91 and have a mechanical G switch that
was never too reliable, and went off by itself some times. You can
continue to use one if installed in your plane but you may not make a
new installation of a C91 ELT. In 1985 the spec was revised to TSO C91a
which requires a much better G switch. You can still buy and install
these. The new 406 MHz ELTs meet TSO C126 as well as C91a, and besides
transmitting to the satellites for a near instant fix on where you are,
have a still better G switch. Most have the ability for the user to test
them easily.
If you don't care whether people find your wreck, a used C91a unit is
probably fine. If I were buying a new one, under $600 for a 406 MHz unit
is cheap enough, I think.
Message 2
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| Subject: | Re: one-wire alternators- the subject that just |
won't die
Wow. I have updated my Connection a few times over the years but not since the
dawn of my personal ipad era. I will purchase an updated digital version - this
looks like a must have so I can peruse the aeroelectric scriptures anytime,
anywhere.
Thanks for all your work over the years to make this resource available, Bob.
Outstanding.
> On Aug 14, 2014, at 1:22 PM, "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
wrote:
>
>
> At 11:04 AM 8/14/2014, you wrote:
>> Charlie: I have the same question. Did you ever hear back and I somehow missed
it here?
>>
>> -Bill Boyd
>
> See http://tinyurl.com/ndz7gtw
>
>
>
> Bob . . .
>
>
>
>
Message 3
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| Subject: | Re: ELT: 406 vs 121.5 |
121.5 is no longer monitored via "satelites". Cross country pilots should
still listen on 121.5 if able, and report. Airborne searches and ground
crews can still home in on the 121.5. But if you want to be "saved", and
not just "recovered eventually", you must have 406 with GPS connected. If
"recovery" is good enough for you but your plane has a passenger seat, your
choice affects them too.
Bevan
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of D L
Josephson
Sent: Friday, August 15, 2014 2:09 AM
Subject: AeroElectric-List: Re: ELT: 406 vs 121.5
--> <dlj04@josephson.com>
First, keep in mind that 406 MHz ELTs are *also* 121.5 MHz ELTs, so existing
monitoring on 121.5 is not going to go away any time soon. FCC announced
around five years ago that they were planning to ban manufacture and use of
121.5/243 ELTs, but gave up when AOPA and FAA asked them not to do that. FCC
will not approve any new 121.5/243 MHz ELT transmitter designs but existing
models can still be made, sold and installed.
There are three TSOs that apply to ELTs. The early ones like the original
Narco ELT-10 meet TSO C91 and have a mechanical G switch that was never too
reliable, and went off by itself some times. You can continue to use one if
installed in your plane but you may not make a new installation of a C91
ELT. In 1985 the spec was revised to TSO C91a which requires a much better G
switch. You can still buy and install these. The new 406 MHz ELTs meet TSO
C126 as well as C91a, and besides transmitting to the satellites for a near
instant fix on where you are, have a still better G switch. Most have the
ability for the user to test them easily.
If you don't care whether people find your wreck, a used C91a unit is
probably fine. If I were buying a new one, under $600 for a 406 MHz unit is
cheap enough, I think.
Message 4
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| Subject: | Re: ELT: 406 vs 121.5 |
Evidently 406 even without GPS is pretty good, local A&P got a call from a customer.
He had been called by the Feds to notify him his ELT was triggered. They
were able to tell him where it was parked on the ramp, GPS not connected yet.
Tim
> On Aug 15, 2014, at 12:55 PM, "B Tomm" <fvalarm@rapidnet.net> wrote:
>
>
> 121.5 is no longer monitored via "satelites". Cross country pilots should
> still listen on 121.5 if able, and report. Airborne searches and ground
> crews can still home in on the 121.5. But if you want to be "saved", and
> not just "recovered eventually", you must have 406 with GPS connected. If
> "recovery" is good enough for you but your plane has a passenger seat, your
> choice affects them too.
>
> Bevan
>
> -----Original Message-----
> From: owner-aeroelectric-list-server@matronics.com
> [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of D L
> Josephson
> Sent: Friday, August 15, 2014 2:09 AM
> To: aeroelectric-list@matronics.com
> Subject: AeroElectric-List: Re: ELT: 406 vs 121.5
>
> --> <dlj04@josephson.com>
>
> First, keep in mind that 406 MHz ELTs are *also* 121.5 MHz ELTs, so existing
> monitoring on 121.5 is not going to go away any time soon. FCC announced
> around five years ago that they were planning to ban manufacture and use of
> 121.5/243 ELTs, but gave up when AOPA and FAA asked them not to do that. FCC
> will not approve any new 121.5/243 MHz ELT transmitter designs but existing
> models can still be made, sold and installed.
>
> There are three TSOs that apply to ELTs. The early ones like the original
> Narco ELT-10 meet TSO C91 and have a mechanical G switch that was never too
> reliable, and went off by itself some times. You can continue to use one if
> installed in your plane but you may not make a new installation of a C91
> ELT. In 1985 the spec was revised to TSO C91a which requires a much better G
> switch. You can still buy and install these. The new 406 MHz ELTs meet TSO
> C126 as well as C91a, and besides transmitting to the satellites for a near
> instant fix on where you are, have a still better G switch. Most have the
> ability for the user to test them easily.
>
> If you don't care whether people find your wreck, a used C91a unit is
> probably fine. If I were buying a new one, under $600 for a 406 MHz unit is
> cheap enough, I think.
>
>
>
>
>
>
>
>
Message 5
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| Subject: | Z-19 Symbol Question |
What is the small square that is in the line between the main battery contactor
and the engine battery contactor on the Z-19 Diagram?
Thanks
Justin
Message 6
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| Subject: | Re: ELT: 406 vs 121.5 |
Excellent description of the differences. There are some other
considerations. ELTs were first required in 1973. Satellite monitoring
did not start until perhaps the mid 1980s, so the loss of sat monitoring
of 121.5 just means less false alarms pursued. The TSO91a units are far
and away the least expensive for new legal install, including
maintenance as most allow usage of standard D cells.
A 406 ELT is 2-3 times more expensive to buy, requires at least double
the install time IF connecting to a GPS, and requires at least 2 and
some 3 lithium batteries. The least expensive ACK requires 3 batteries.
It will come with the main battery, which costs well north of $100 to
replace, and you will have to buy the other 2 photo type batteries that
are 10-20 each, which operate the remote panel and the alarm buzzer. All
3 are good for at least 5 years if not triggered. However, a false alarm
trip that goes for more than 1 hour will not only get you a phone call,
but you will get to replace that main battery, at a minimum. Also, not
entirely clear what recurrent tests will have to be done, as the current
reg is written to testing 121.5 units. Some have a self test built in,
but that may not be sufficient.
Also, there is one more expensive 406 unit with its own built-in GPS,
that incorporates GPS antenna with the transmit antenna, but is
certified without 121.5. As far as I know only a few CAP aircraft have
the capability to home in on a 406 only signal, while all can home on 121.5.
On 8/15/2014 2:08 AM, D L Josephson wrote:
> <dlj04@josephson.com>
>
> First, keep in mind that 406 MHz ELTs are *also* 121.5 MHz ELTs, so
> existing monitoring on 121.5 is not going to go away any time soon.
> FCC announced around five years ago that they were planning to ban
> manufacture and use of 121.5/243 ELTs, but gave up when AOPA and FAA
> asked them not to do that. FCC will not approve any new 121.5/243 MHz
> ELT transmitter designs but existing models can still be made, sold
> and installed.
>
> There are three TSOs that apply to ELTs. The early ones like the
> original Narco ELT-10 meet TSO C91 and have a mechanical G switch that
> was never too reliable, and went off by itself some times. You can
> continue to use one if installed in your plane but you may not make a
> new installation of a C91 ELT. In 1985 the spec was revised to TSO
> C91a which requires a much better G switch. You can still buy and
> install these. The new 406 MHz ELTs meet TSO C126 as well as C91a, and
> besides transmitting to the satellites for a near instant fix on where
> you are, have a still better G switch. Most have the ability for the
> user to test them easily.
>
> If you don't care whether people find your wreck, a used C91a unit is
> probably fine. If I were buying a new one, under $600 for a 406 MHz
> unit is cheap enough, I think.
>
>
Message 7
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| Subject: | apple charger circuit |
Greetings list.
I saw this Instructable and thought it might be helpful.
http://www.instructables.com/id/THE-Simplest-iPod-iPad-iPhone-charger-circuit/?ALLSTEPS
--
Raymond Julian
Kettle River, MN
The things we admire in men, kindness and generosity, openness, honesty,
understanding and feeling are the concomitants of failure in our system.
And those traits we detest, sharpness, greed, acquisitiveness, meanness,
egotism and self-interest are the traits of success. And while men
admire the quality of the first they love the produce of the second.
-John Steinbeck, novelist, Nobel laureate (1902-1968)
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