---------------------------------------------------------- Allegro-List Digest Archive --- Total Messages Posted Mon 05/14/07: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 04:21 AM - Re: External ELT Antenna Location (Thom Riddle) 2. 08:05 AM - Re: External ELT Antenna Location (Hugh McKay III) ________________________________ Message 1 _____________________________________ Time: 04:21:20 AM PST US From: Thom Riddle Subject: Re: Allegro-List: External ELT Antenna Location Hugh, We have an older model ACK ELT (the orange one) mounted on the top of the luggage compartment deck just to the right of the flap motor box. Our antenna is a simple telescoping one attached to the coax connector with a 90 degree elbow (no cable) and it is telescoped toward the left side of the airplane behind the pilot's seat. We like it mounted above the baggage floor so we can reach it from the pilot's seat. I know it works because we once inadvertently left it on parked inside the all steel hangar and were called on the carpet about it by S and R. My point is that with the primarily fiberglass body there appears to be no real need to mount the antenna externally. You can buy one of these little telescoping antenna from most avionics shops. Thom in Buffalo ________________________________ Message 2 _____________________________________ Time: 08:05:03 AM PST US From: "Hugh McKay III" Subject: RE: Allegro-List: External ELT Antenna Location Thom: I have a telescoping antenna that came with the ACK E-01 ELT. The way I have mounted the ELT in the belly allows me to use the telescoping antenna. The unit and antenna are mounted such that when the antenna is extended it is parallel to the centerline of the fuselage. The manufacturer states in his installation and operation manual that the telescoping antenna is not suitable for use in the aircraft. I don't understand why. They supply an external antenna which they state "meets the requirements of TSO-C91a and FAR 91.207". It is a quarterwave coil loaded monopole design meeting the VSWR requirements and must be mounted externally on the aircraft. If I have to mount it externally, the only practical and accessible location is on the top of the left aluminum wing/fuselage covering that is between the wing and the fuselage. I am unclear as to the FAA requirements concerning the two types of antennas (i.e. doest the FAA require and external antenna). It seems to me that the external antenna is more susceptible to being damaged, or even having its connecting coaxial cable severed in an accident vs. the telescoping antenna that is directly connected to the ELT itself. I would appreciate some more input on this whole subject of ELT antennas. Hugh -----Original Message----- From: owner-allegro-list-server@matronics.com [mailto:owner-allegro-list-server@matronics.com]On Behalf Of Thom Riddle Sent: Monday, May 14, 2007 7:21 AM Subject: Re: Allegro-List: External ELT Antenna Location Hugh, We have an older model ACK ELT (the orange one) mounted on the top of the luggage compartment deck just to the right of the flap motor box. Our antenna is a simple telescoping one attached to the coax connector with a 90 degree elbow (no cable) and it is telescoped toward the left side of the airplane behind the pilot's seat. We like it mounted above the baggage floor so we can reach it from the pilot's seat. I know it works because we once inadvertently left it on parked inside the all steel hangar and were called on the carpet about it by S and R. My point is that with the primarily fiberglass body there appears to be no real need to mount the antenna externally. You can buy one of these little telescoping antenna from most avionics shops. Thom in Buffalo ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message allegro-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Allegro-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/allegro-list Browse Digests http://www.matronics.com/digest/allegro-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.