Today's Message Index:
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1. 08:25 AM - Re: Re: ELT Antenna (Robert L. Nuckolls, III)
2. 01:49 PM - Re: parelling two rp3 indicators (Robert L. Nuckolls, III)
3. 01:51 PM - Re: ELT Antenna (Robert L. Nuckolls, III)
4. 07:59 PM - Batteries: Pb Acid -vs- Pb Crystal -vs- LiFePO (Eric Page)
Message 1
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At 07:01 AM 1/16/2014, you wrote:
<nuckolls.bob@aeroelectric.com>
I wrote: I've heard the rumor that some ELT's were triggered
by local radiation from a comm transmitter . . . but
I've not seen any documentation or FMEA that supported
the assertion.
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I was informed by an astute reader that the ACK E-01
series ELTs were demonstrably plagued with a tendency
to trigger in response to on-board COMM transmissions.
This fact (and perhaps others like it) may have been the
foundation for advising installers to add separation
between the ELT and ship's COMM antennas.
While the 'fix' is valid, the premise under which
the fix is exercised assumes that the ELT was
properly qualified to be on the airplane in the
first place. Any ELT that goes through the lab
where I work would have demonstrated immunity to
RF interference many times stronger than the ship's
transceivers.
The consumer has every reason to expect certain
levels of performance in their ELT for it has
been decreed and . . . it's a matter of practical
utility.
With better information, a retraction is in order
for my assertion that the RF triggering event
was a 'rumor'. At the same time I would advise
that compromising the installation of your
own 'antenna farm' in recognition of the
historical fact is unnecessary. If the ELT you
have demonstrates such sensitivity, then
there is good reason to suspect a defect in
design and/or manufacturing that needs attended
to . . . defects that may go beyond the sensitivity
to RF.
If the ELT is the last bastion of defense for
your survival, then offer no quarter in
your expectations for its performance.
Bob . . .
Message 2
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| Subject: | Re: parelling two rp3 indicators |
At 02:27 PM 1/17/2014, you wrote:
>Message for Bob, Ref. this email you sent to me Dec. 22
>2011 Conserning the capasitor on the attached drawing. What
>should the specs. be? I'm not up on electronic
>ckts. Thanks Bill S.
>
>
A 10uf/16v would be fine . . . it's exceedinly
un-critical.
http://tinyurl.com/mee3oal
Bob . . .
Message 3
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At 07:56 AM 1/17/2014, you wrote:
>1/17/2014
>
>Hello Bob Nuckolls, You wrote: =9CI've heard the
>rumor that some ELT's were triggered by local
>radiation from a comm transmitter . . . but
>I've not seen any documentation or FMEA that supported the assertion.
=9D
>
>Please let me give you one factual data point on
>that issue. I was unable to launch on the first
>attempted test flight of my experimental amateur
>built KIS TR-1 airplane because every time I
>keyed the VHF comm transmitter to talk to either
>ground or tower the ACK ELT-01 began to transmit.
Thanks for the heads-up! I've found a number
of service bulletins against the ELT-01 over
it's market life . . . one involved replacement
of the g-switch. I'd like to know what the
technology is for that switch. Dug around in
the patents a bit but didn't find anything.
Bob . . .
Message 4
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| Subject: | Batteries: Pb Acid -vs- Pb Crystal -vs- LiFePO |
I follow an electronics-related YouTube channel by a South African (recently emigrated
to Ohio) gent named Martin Lorton. He posted a video recently in which
he talks about some comparison tests he's done of three different battery chemistries.
His goal is to identify the best for use as a storage bank for a home
solar installation, but I thought his results might be of general interest,
particularly given the recent discussions here WRT lightweight LiFePO batteries.
The battery discussion runs from 16:55 to 24:50 in the video.
http://y2u.be/eQ6m1EVwOAw
Eric
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