MicroAir Avionics M760 - M760 Power Requirements; Backlighting Operation; Power Saving Tips

Microair Avionics M760 Transceiver Installation & User Manual
M760Q Install & User Manual 01R12.doc Page 10 of 36 30
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March 2010
3.4 POWER
The M760 is designed to operate on a 14V aircraft electrical supply. The radio will operate down to
10.7V on receive.
It is unlikely that a power supply operating below 11V would
have sufficient power to allow clear transmissions.
The M760 will draw up to 1.8A when transmitting.
Low power will produce a BURRRRRRRRRR signal.
NEVER operate the M760 on voltage exceeding 16V.
Damage will occur if the M760 is operated from power supplies
which exceed 16V, even for very short (transient) periods.
Operation on a supply which exceeds 16V will void the warranty.
The M760 has a FET switch and internal fuse to protect against reverse polarity. If reverse polarity is
applied the internal fuse (4A) will blow. Damage however may not be limited to the fuse.
Please ensure that the correct polarity is observed. The most
common reason for reverse polarity, is misreading the pin
assignments on the DB-15 connector.
Applying reverse polarity to the M760 will void the warranty
Check your wiring! Always check the voltage at the DB15 BEFORE it is
plugged into the radio.
Use a multi-meter to check the voltage at the following pins:
Positive Pin 9 Negative Pin 11
Positive Pin 10 Negative Pin 12
3.4.1 BACKLIGHTING
The backlighting is activated, by taking input supply voltage to pin 8. This line can be individually
switched outside the DB15 connector to enable the backlighting to be turned off.
3.4.2 POWER SAVINGS
For installations, operating from a battery only, Microair recommends saving battery power by NOT
wiring the backlighting – do NOT wire pin 8. The backlighting will draw an additional 80mA of power.
This nearly doubles the standby power demand.
Not
connecting the backlighting can effectively double the running time on your battery.