ceengland7(at)gmail.com
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 Posted: Sat Dec 08, 2012 6:26 am Post subject: ELT Antenna (406MHz) - Copper Dipole style...will this wo |
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I'd suggest taking a look at where the same brand antenna is installed
on some fully certificated factory single engine planes, & take some
pictures for your DAR. Most are on the fuselage, right? How many single
engine a/c have tail cones that are 48" wide?
Charlie
On 12/08/2012 06:50 AM, Ken wrote:
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I'm told that in actual searches the 121.5 very low power homing
signal from most 406 ELT's is next to useless anyway unless you are in
visual range. So a ground plane sized for 406 mhz would satisfy my
personal requirements. Still won't make you legal but perhaps a
reasonable compromise?? More important to me is wiring a gps signal
into the E-04.
Ken
On 07/12/2012 9:07 PM, Kelly McMullen wrote:
>
> <kellym(at)aviating.com>
>
> 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:
>>
>>
>> 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
>>
>> --------
>> Howard Plevyak
>> GlaStar / North Bend, Ohio
>> hplevyak(at)mac.com
>>
>>
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