On Jan 19, 6:45*pm, Derek Copeland wrote:
So do the many wooden and vintage gliders still flying have TNs from their
manufacturers for fitting Mode S transponders then? Somehow I rather doubt
it!

Derek C *

At 00:15 20 January 2009, Big Wings wrote:



Schempp-Hirth has TNs for transponders as well - permitting three
different
antenna types - blade, rod or bendy.

The new Trig Avionics TT21 transponder, with built-in altitude encoder
is
estimated by the makers to consume 320 mA from a 12 V battery when busy.
Assuming the 7Ah battery is only delivering 50% of nominal capacity this
equates to 10 hours continuous use.

The controller that needs to be accessed by the pilot is 6.4 x 4.5 x 4.5
cm, the transponder itself can be installed anywhere convenient in the
glider so will fit most gliders. *(And I don't have an interest in it.)

At 22:47 19 January 2009, brianDG303 wrote:
On Jan 19, 10:18=A0am, Chris Reed *wrote:

Second, installation can only be done, as I understand it, if either
(a)
the manufacture has issued an approved scheme for installation
(Ibelieve none have,

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DG has a TN for the installation, probably others do as well, but you
have to dig a bit for it.

I agree that the power issue might not be that important. Selecting a
lower current encoder (ACK?) can help. For my installation I installed
wiring for a second battery but am waiting to see if it's really
needed. It might only be required for unusually long flights, and in
those cases might be avoided by using a 'load shedding' check list-
by
using the back-up battery in the vario, shifting the PDA to it's
internal battery, and avoiding idle chatter on the radio you get some
extra hours.

Well Schleicher has a TM concerning the installation of a transponder
for my Ka-6

http://alexander-schleicher.de/tm/06/060_TM24_D.pdf

Still doesn't address the cost issue though

Pete