ASW27 Trasponder Antenna Installation Inside Fuselage.

Hello, my intention is to fit a Transponder Antenna within my ASW27. I was

wondering does anyone know where on the ASW27 Fuselage is not Carbon
or Aramid(conductive) construction, which would allow internal fitting of
an
antenna such as a Dolba BD1, Dolba BD2, FUNKE DP1090-5 or similar?
Schleicher TM/TN 13 “installation of a PCB-transponder antenna in the
vertical tail� doesn’t give a drawing/photo/diagram and I have
requested
additional information from Zulu-Glasstek. If I were to install antenna
within
the vertical stabilizer (Dolba BD1), the coax cable length would be
considerable (6 to 7 metre) and routing-security could be an issue, using
Carlisle ECS P/N 311501 coax cable. However, if the nose (tip area) of the

fuselage was manufactured from GRP as maybe used on other carbon fibre
Schleicher fuselages, then I would endeavour to install antenna within this

area? I have 95% dismissed TM/TN 12, installation of external antenna
alongside undercarriage due to it being ugly and prone to damage. Any
information gladly received. Best regards Paul.

On Sunday, February 28, 2016 at 7:15:13 AM UTC-5, Paul Birkett wrote:
Hello, my intention is to fit a Transponder Antenna within my ASW27. I was

wondering does anyone know where on the ASW27 Fuselage is not Carbon
or Aramid(conductive) construction, which would allow internal fitting of
an
antenna such as a Dolba BD1, Dolba BD2, FUNKE DP1090-5 or similar?
Schleicher TM/TN 13 "installation of a PCB-transponder antenna in the
vertical tail" doesn't give a drawing/photo/diagram and I have
requested
additional information from Zulu-Glasstek. If I were to install antenna
within
the vertical stabilizer (Dolba BD1), the coax cable length would be
considerable (6 to 7 metre) and routing-security could be an issue, using
Carlisle ECS P/N 311501 coax cable. However, if the nose (tip area) of the

fuselage was manufactured from GRP as maybe used on other carbon fibre
Schleicher fuselages, then I would endeavour to install antenna within this

area? I have 95% dismissed TM/TN 12, installation of external antenna
alongside undercarriage due to it being ugly and prone to damage. Any
information gladly received. Best regards Paul.

We have installed the antenna, before TN 12 came out, on the bottom behind the gear. This requires and external ground plane of aluminum formed to match the fuselage contour. It looks better than the TN install and is about 5 times the work. All later ones were done to TN 12.
Nose does not meet required criteria.
FWIW
UH

You can snake a coax cable back through the fuselage to an L2 antenna in the tail battery box. Not easy or fun but possible. UH solution is "easier"

John Cochrane

If it's a "27", not a "27B" or "29", there is a place below the seat pan, under your left knee that a ground plane and stubby antenna can be mounted.
It tests fine at TXP certification, is relatively easy to install and connect, and is zero drag.
Jim

On Sunday, February 28, 2016 at 11:24:09 AM UTC-5, JS wrote:
If it's a "27", not a "27B" or "29", there is a place below the seat pan, under your left knee that a ground plane and stubby antenna can be mounted.
It tests fine at TXP certification, is relatively easy to install and connect, and is zero drag.
Jim

RF transmitting a foot and a half from the family jewels may not be optimum.
FWIW
UH

The ground plane should take care of that.

On 2/28/2016 11:11 AM, wrote:
On Sunday, February 28, 2016 at 11:24:09 AM UTC-5, JS wrote:
If it's a "27", not a "27B" or "29", there is a place below the seat pan, under your left knee that a ground plane and stubby antenna can be mounted.
It tests fine at TXP certification, is relatively easy to install and connect, and is zero drag.
Jim
RF transmitting a foot and a half from the family jewels may not be optimum.
FWIW
UH

--
Dan, 5J

On Sunday, February 28, 2016 at 10:11:18 AM UTC-8, wrote:
On Sunday, February 28, 2016 at 11:24:09 AM UTC-5, JS wrote:
If it's a "27", not a "27B" or "29", there is a place below the seat pan, under your left knee that a ground plane and stubby antenna can be mounted.
It tests fine at TXP certification, is relatively easy to install and connect, and is zero drag.
Jim

RF transmitting a foot and a half from the family jewels may not be optimum.
FWIW
UH

There's been plenty of tests on that in conjunction with the European personal transponder initiatives. All of my children have had no more that 4 eyes and 3 ears.....

At 15:20 28 February 2016, John Cochrane wrote:
You can snake a coax cable back through the fuselage to an L2 antenna in
the tail battery box. Not easy or fun but possible. UH solution is
"easier"


John Cochrane

Hello John, many thanks for the information. Was the L2 antenna mounted
inside the battery box and doesn't the horizontal
stabilizer(carbon-Kevlar-
aramid) structure shadow the antenna? Also, did you have to "Fettle" the
vertical stab to enable coax routing?
Many thanks to all replies.
Best regards
Paul

At 15:20 28 February 2016, John Cochrane wrote:
You can snake a coax cable back through the fuselage to an L2 antenna in
the tail battery box. Not easy or fun but possible. UH solution is
"easier"


John Cochrane

Hello John, many thanks for the information. Was the L2 antenna mounted
inside the battery box and doesn't the horizontal
stabilizer(carbon-Kevlar-
aramid) structure shadow the antenna? Also, did you have to "Fettle" the
vertical stab to enable coax routing?
Many thanks to all replies.
Best regards
Paul

At 15:20 28 February 2016, John Cochrane wrote:
You can snake a coax cable back through the fuselage to an L2 antenna in
the tail battery box. Not easy or fun but possible. UH solution is
"easier"


John Cochrane

Hello John, many thanks for the information. Was the L2 antenna mounted
inside the battery box and doesn't the horizontal
stabilizer(carbon-Kevlar-
aramid) structure shadow the antenna? Also, did you have to "Fettle" the
vertical stab to enable coax routing?
Many thanks to all replies.
Best regards
Paul