On Sunday, February 28, 2016 at 4:15:13 AM UTC-8, 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.

You can often determine what is carbon vs. kevlar or white glass by shining a strong light through it. Carbon is opaque, gel coat/glass less so. On a 26 which has a very similar fuselage, I installed a dipole inside of the nose ahead of the rudder pedals. It tests fine from all angles, and return is reported good from many contacts in the air. No drag, no possibility of breaking it off ground handling. There are some who considered this a heretical install, so you will have to decide for yourself.