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klehman(at)albedo.net
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 Posted: Sat Dec 08, 2012 4:51 am Post subject: ELT Antenna (406MHz) - Copper Dipole style...will this wor |
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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:
| Quote: |
<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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tim2542(at)sbcglobal.net
Guest
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| Posted: Sat Dec 08, 2012 6:25 am Post subject: ELT Antenna (406MHz) - Copper Dipole style...will this wor |
|
|
The problem is the ACK 406,ELT does a function check of the antenna, if it doesn't like what it sees down the antenna connection it faults. So even if you make a nicely resonant antenna for 406 I don't think it will work. See: http://ackavionics.com/406%20Page.html
Tim
On Dec 8, 2012, at 4:50 AM, Ken <klehman(at)albedo.net (klehman(at)albedo.net)> wrote:
[quote]--> AeroElectric-List message posted by: Ken <klehman(at)albedo.net (klehman(at)albedo.net)>
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:
| Quote: | --> AeroElectric-List message posted by: Kelly McMullen
<kellym(at)aviating.com (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:
| Quote: | --> AeroElectric-List message posted by: "plevyakh" <hplevyak(at)mac.com (hplevyak(at)mac.com)>
|
| Quote: | I'm building a GlaStar (composite glass fuselage with metal wings and
|
| Quote: | control surfaces).
|
| Quote: | I'm going with INTERNAL mount for the antenna, and will be placing it
|
| Quote: | just AFT of my bulkhead "A" as one of the most survivable locations in
|
| Quote: | a crash for my aircraft.
|
| Quote: | I have the ACK E-04 unit and it comes with it's own antenna, but that
|
| Quote: | requires creating a 48" dia. ground plane! (24" long copper foil
|
| Quote: | elements, per the E-04 Install guide). I don't have the room for this
|
| Quote: | in the tail cone...given I have other stuff back there in the way.
|
| Quote: | I have one of Jim Weir's RS-802 Copper Dipole Antenna kits and I was
|
| Quote: | going to make my own. His kit dwg 802-8905 shows how to create one for
|
| Quote: | the older style 121.5 units. So I'm thinking I'd use this same X cross
|
| Quote: | style antenna, and have one V with Lengths = 22.5" (121.5MHz), and the
|
| Quote: | other V with lengths = 7.3" (406MHz).
|
| Quote: | This should fit nicely onto the sidewall of the tunnel AFT of Bulkhead
|
| Quote: | "A" in a vertically mounted position (see attached dwg).
|
| Quote: | Am I correct in my modification of the Jim Weir design to be able to
|
| Quote: | accommodate the 406MHz frequency?
|
| Quote: | Are there any other changes I need to make with this double V design
|
| Quote: | Has anyone run into a problem in their Final FAA inspection in getting
|
| Quote: | approval to use a "Double V style antenna"?
|
| Quote: | Thanks for any thoughts.
|
| Quote: | GlaStar / North Bend, Ohio
|
|
c www.aeroelectric.com
http://www.matronics.====================================================; - MATRONICS WEB FORUM"http://forums.matronics.com">http://forums.matronics.com
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http://www.matronics.com/Navigator?AeroElectric-List |
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