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PPENDIX
This appendix provides information to assist troubleshooting if problems occur after
completing the installation. Use Table 4 to assist in troubleshooting.
Problem
The SL50/60 does not power on. The unit is not getting power.
The SL50/60 does not compute
a position.
The GPS signal levels are very
low.
GPS signal levels drop when
avionics are turned on.
The SL60 does not transmit.
The sidetone level is too low or
too high.
The intercom doesn't function.
Apollo SL50 / SL60 Installation Manual
ROUBLESHOOTING
Table 4 Troubleshooting Guide
Cause
Not receiving signals, or incorrect
seed position, time, and date.
Improper antenna installation or coax
routing.
Antenna shaded from satellites.
RF interference at 1575.42MHz from
VHF comm.
Noise interference from other
avionics.
The TxKey input is not being pulled
low.
A weather channel is selected.
No power to the comm.
The input voltage is too low.
Wrong type of headsets, or level
needs adjustment.
Control input not connected.
Active frequency signal present.
No voice activation, or have to talk
too loud.
Troubleshooting
Solution
Check power connections, breakers,
and main avionics switch.
Make sure a correct position and
time/date have been entered. Check
the GPS antenna connections. Make
sure the aircraft is clear of hangers,
buildings, trees, etc.
Check GPS antenna installation,
connections, and cable routing. The
GPS antenna must be mounted on the
top of the aircraft.
Make sure the aircraft is clear of
hangers, buildings, trees, etc.
Move GPS antenna further from the
comm antenna. Add a 1575.42MHz
notch filter in comm coax. Fix or
replace the comm. Disconnect the
ELT antenna coax.
Turn all avionics off, then turn on
each piece one at a time to isolate the
source of the interference. Route
cable and antenna away from sources
of interference.
Check the TxKey (mic key) input,
pulled low for transmit.
Select a different frequency, the unit
will not transmit on a weather
channel.
Make sure power input is connected
to the comm 15 pin connector.
Increase input supply voltage to > 9
volts DC.
See the Sidetone Level Adjustment on
page 25.
The intercom select input must be
pulled to ground to turn on the
intercom function.
Change the active frequency. The
active frequency has priority.
Change the intercom squelch
threshold using the setup function
described in the user's manual.
39
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