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TM250 / P/N 250TM-(xxx)-(xxx)
Operation and Installation
7
Document No.: 03.310.010.71e / Revision: 2.10
In case an external FLARM
®
is connected, the FLARM
®
alert
will automatically be disabled (see 2.4.2), in order to avoid
permanent alerting. This does not impact the display of
FLARM
®
targets. FLARM
®
targets will still be displayed.
If the aircraft does not carry such a FLARM
®
receiver connected to the
TM250, other gliders nearby that have a FLARM
®
transmitter can still
being detected and indicated on the TM250 graphically and acoustically.
This is achieved through a raw, non-directional detection of the signal
strength of a nearby FLARM
®
transmitter inside the TM250. In this case,
however, it is not possible to indicate the direction, distance, altitude, or
position of such targets. Also, no transmission to other gliders occurs.
For traffic display and warning, four different types of targets are
distinguished depending on the respective equipment of these aircraft.
1. FLARM® targets
Aircraft, particularly gliders, with a FLARM
®
system: As long as no
external FLARM
®
receiver is connected to the TM250, the recognition of
the FLARM
®
equipped airplanes is based merely on the detection of the
signals, and will be shown in the counter, but not on the “map”.
Due to their low radio transmission power, FLARM
®
targets can only be
detected in smaller distances than the other target types.
2. Mode S targets
Aircraft with a Mode S transponder without ADS-B "out" function (not
"extended squitter" capable): The Mode S Transponder sends out the
ICAO 24bit address that allows identifying the transmitter. A rough
estimate of distance and approach rate of each transponder is
determined by measuring the field strength of these transmissions.
3. Mode AC targets
Aircraft with non-Mode-S-capable (older) transponder: The transponder-
transmissions contain either the altitude (Mode C) or the Squawk
(Mode A). It is technically not possible to always distinguish between
these two transmissions – for safety reasons, in these cases the
information is always interpreted as altitude, what may lead to
unnecessary warnings. As additionally the AC transmissions do not
contain the 24bit address of the Mode S signal, it is not impossible, that
one and the same aircraft, due to transmitting both Mode S and