Kellym
Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ
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 Posted: Fri Dec 07, 2012 6:08 pm Post subject: ELT Antenna (406MHz) - Copper Dipole style...will this work |
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It will be dependent on DAR you use. On the face of it, the ELT is ONLY
TSO approved with supplied antenna(or optional approved antennas).
Any other antenna will have a different VSWR that may or may not affect
the ELT performance and cause it to not meet TSO requirements.
Note that even on experimental, IF you are required to have an ELT, it
must be a TSO ELT. Whether your DAR will exercise any discretion there
or not you won't know without asking up front.
On 12/7/2012 5:43 PM, plevyakh wrote:
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Folks,
I'm building a GlaStar (composite glass fuselage with metal wings and control surfaces).
I'm going with INTERNAL mount for the antenna, and will be placing it just AFT of my bulkhead "A" as one of the most survivable locations in a crash for my aircraft.
I have the ACK E-04 unit and it comes with it's own antenna, but that requires creating a 48" dia. ground plane! (24" long copper foil elements, per the E-04 Install guide). I don't have the room for this in the tail cone...given I have other stuff back there in the way.
I have one of Jim Weir's RS-802 Copper Dipole Antenna kits and I was going to make my own. His kit dwg 802-8905 shows how to create one for the older style 121.5 units. So I'm thinking I'd use this same X cross style antenna, and have one V with Lengths = 22.5" (121.5MHz), and the other V with lengths = 7.3" (406MHz).
This should fit nicely onto the sidewall of the tunnel AFT of Bulkhead "A" in a vertically mounted position (see attached dwg).
Am I correct in my modification of the Jim Weir design to be able to accommodate the 406MHz frequency?
Are there any other changes I need to make with this double V design to make it work?
Has anyone run into a problem in their Final FAA inspection in getting approval to use a "Double V style antenna"?
Thanks for any thoughts.
Howard
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Howard Plevyak
GlaStar / North Bend, Ohio
hplevyak(at)mac.com
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=390046#390046
Attachments:
http://forums.matronics.com//files/elt_copper_foil_dipole_x_design_123.jpg
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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD |
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