---------------------------------------------------------- Avionics-List Digest Archive --- Total Messages Posted Tue 12/02/03: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 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 _____________________________________ Time: 06:19:10 AM PST US From: "Glen Matejcek" Subject: Re: Avionics-List: ELT antenna --> Avionics-List message posted by: "Glen Matejcek" 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 _____________________________________ Time: 07:47:21 AM PST US From: Oliver Neufert Subject: Re: Avionics-List: ELT antenna --> Avionics-List message posted by: Oliver Neufert 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" > >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 _____________________________________ Time: 01:32:08 PM PST US From: "Richard Sipp" Subject: Avionics-List: Chelton/Sierra EFIS --> Avionics-List message posted by: "Richard Sipp" Is anyone aware of a discussion group or user's group focused on the Chelton & Sierra EFIS systems? Regards Dick Sipp RV 10 N110DV