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hgmckay
Joined: 23 May 2006
Posts: 397
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 Posted: Sun May 13, 2007 4:25 pm Post subject: External ELT Antenna Location |
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I have an ACK Technologies Model E-01 mounted in the belly (under the back luggage compartment) of my Allegro 2000. Has any one used this type ELT, and if so where have you mounted the external antenna on the Allegro 2000?
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Hugh McKay in NC
Allegro 2000
N661WW
Rotax 912 UL
[quote][b]
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Thom Riddle
Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)
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| Posted: Mon May 14, 2007 3:21 am Post subject: External ELT Antenna Location |
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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
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_________________
Thom Riddle
Buffalo, NY (9G0)
Don't worry about old age... it doesn't last very long.
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hgmckay
Joined: 23 May 2006
Posts: 397
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| Posted: Mon May 14, 2007 7:05 am Post subject: External ELT Antenna Location |
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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
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