September 2012
Q I have noticed that sometimes when I switch on the Avionics Master, the T2000SFL turns on by itself,
without pressing the ON key. Why ?
A The T2000SFL’s ON key is software controlled. The T2000SFL will remember if it was on or off at the
time the avionics master was lasted switched off. When the power is turned on again, the T2000SFL will
revert to its last operational condition, and turn on. The T2000SFL can be turned ON/OFF via the
avionics master or the ON key, either method is OK.
Q Whilst flying outside normal radar coverage I have noticed that the reply symbol still flashes from time
to time – what causes this ?
A Other aircraft fitted with TCAS systems can still interrogate transponder equipped aircraft like yours.
This then lets them know where you are, and your contact information is displayed on their TCAS
screens. The TCAS aircraft could be 100+ miles away and at altitudes +30,000ft!
Q I have tried to power up my T2000SFL on the bench from a dc power supply, but it won’t start up
properly. What is going on ?
A The T2000SFL has a number of large capacitors fitted, and at the moment of turn on they will try to
charge up. When this happens, an “in rush” of current occurs. If the power supply cannot cope with this
“in rush” the supply voltage will dip to the point where the T2000SFL will detect a power failure, and
reboot. The answer is to connect a battery across the power supply to cushion the “in rush” and allow the
T2000SFL to get past this point.
Prolonged operation with the T2000SFL in reboot may result in a NO COMM error on the display. If
this message appears, the communications between the microprocessor has been disturbed, and may
require factory service.
Q Are there any problems with altitude encoders to be aware of ?
A The T2000SFL is designed to work with ANY TSO-C88a approved encoder. The T2000SFL has the
provision to supply the aircraft power to the encoder. There a several things to watch for here:
Firstly the voltage received by the T2000SFL will be the voltage out to the encoder. Be careful with 28V
aircraft that you select an encoder which is rated to 28V!
Secondly it is very important to wire a connecting ground wire between the encoder and the T2000SFL,
even if you are NOT taking the power from the T2000SFL. This will ensure that the data line signals are
at best performance.
Thirdly NEVER allow the output voltage from the T2000SFL to the encoder to be shorted. This will
always result in internal damage to the T2000SFL, and is NOT covered by the warranty! Do NOT do
this.
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