Today's Message Index:
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1. 06:19 AM - Re: ELT antenna (Glen Matejcek)
2. 07:47 AM - Re: ELT antenna (Oliver Neufert)
3. 01:32 PM - Chelton/Sierra EFIS (Richard Sipp)
Message 1
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--> Avionics-List message posted by: "Glen Matejcek" <aerobubba@earthlink.net>
Hi Jim and Oliver-
The installation instructions for the ELT (and if I recall correctly,
43.13) advise against running the feedline across major joins in the
airframe. This is to reduce the possibility of the coax being cut by
airframe distortion / failure. Also, they advise to limit the feedline
length to that provided with the ELT. This limits how far the antenna can
be from the ELT (like about 6 feet), which is to be mounted as far aft in
the fuse as practical.
As to the antenna location on the belly, the weakest link in the RV-8
structure seems to be the gear. Landing on an unprepared surface (IE,
crop) will most likely take the gear off. One could come away completely
unhurt and still loose the gear. That theory has already been tested,
fortunately not by me. But even if one were to end up on the gear, your
best bet on success out in the boonies is to have a satellite pick up your
signal. A belly mounted antenna for a VHF radio doesn't seem like a good
choice for that. Also, as I type this, I'm not sure that if the gear were
still intact that the ELT would activate. (shaky Cessna nose gear
notwithstanding... GRIN!)
Thanks for the comments- I look forward to some inspiration and will
report back with whatever I finally decide upon.
gm
Message 2
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--> Avionics-List message posted by: Oliver Neufert <oliver.neufert@wanadoo.fr>
Hi Glen,
Sorry about that, I realized that we were speaking about an ELT only after
I sent my message (don't know why, I was under the impression we were
speaking about a transponder)
In that case, I recall that on a Baron 58, the ELT antenna was mounted on
the side of the fuselage, and the shape of the antenna was like a large
coin stuck to the fuselage (chrome plated). Similar to the static port on
some airplanes (Robin DR400, CAP-10), but without the hole. I have no idea
how well it works for sending out the signal, but it won't break off in the
event of an impact. It seems that it was original with the airplane when new.
hope it helps
Oliver.
At 09:18 AM 12/2/2003 -0500, you wrote:
>--> Avionics-List message posted by: "Glen Matejcek" <aerobubba@earthlink.net>
>
>Hi Jim and Oliver-
>
>The installation instructions for the ELT (and if I recall correctly,
>43.13) advise against running the feedline across major joins in the
>airframe. This is to reduce the possibility of the coax being cut by
>airframe distortion / failure. Also, they advise to limit the feedline
>length to that provided with the ELT. This limits how far the antenna can
>be from the ELT (like about 6 feet), which is to be mounted as far aft in
>the fuse as practical.
>
>As to the antenna location on the belly, the weakest link in the RV-8
>structure seems to be the gear. Landing on an unprepared surface (IE,
>crop) will most likely take the gear off. One could come away completely
>unhurt and still loose the gear. That theory has already been tested,
>fortunately not by me. But even if one were to end up on the gear, your
>best bet on success out in the boonies is to have a satellite pick up your
>signal. A belly mounted antenna for a VHF radio doesn't seem like a good
>choice for that. Also, as I type this, I'm not sure that if the gear were
>still intact that the ELT would activate. (shaky Cessna nose gear
>notwithstanding... GRIN!)
>
>Thanks for the comments- I look forward to some inspiration and will
>report back with whatever I finally decide upon.
>
>gm
>
>
Message 3
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| Subject: | Chelton/Sierra EFIS |
--> Avionics-List message posted by: "Richard Sipp" <rsipp@earthlink.net>
Is anyone aware of a discussion group or user's group focused on the Chelton
& Sierra EFIS systems?
Regards
Dick Sipp
RV 10 N110DV
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