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Apollo GX50/60/65 Installation Manual
15
SPEAKER AND HEADPHONE OUTPUTS (GX60/65 ONLY)
Connect the speaker and headphones to the output pins on the rear connector.
MICROPHONE INPUTS (GX60/65 ONLY)
Microphone input connections should be made using a twisted pair shielded cable. Attach the
signal ground to the mic ground pin on the rear connector and connect the shield to the rear
connector plate.
TRANSMIT KEY INPUT (GX60/65 ONLY)
The TxKey input on the rear connector must be pulled low to ground to enable the transmitter. This
input should be connected to a microphone or yoke mounted momentary push button switch.
INTERCOM SELECTOR SWITCH (GX60/65 ONLY)
The GX60/65 includes a voice activated intercom function that can be enabled by an external
control switch. This is an optional connection.
When making connection for the intercom selection, connect the intercom selection input to a
remote mounted normally open switch. A momentary toggle or alternate action switch can be
used. Connect the other terminal of the switch to ground. The intercom function is enabled
when the input is pulled low to ground. The monitor function is inhibited when the intercom
function is selected.
REMOTE FLIP/FLOP INPUT (GX60/65 ONLY)
The GX60/65 includes a remote flip/flop input. This is an optional input that can be connected
to a remote mounted (such as on the yoke) momentary push button switch which pulls the
input low to ground.
ANTENNA INSTALLATION AND CONNECTIONS
COMM ANTENNA (GX60/65 ONLY)
The GX60/65 requires a standard 50Ω vertically polarized antenna. Follow the antenna
manufacturer’s installation instructions for mounting the antenna.
The antenna should be mounted on a metal surface or a ground plane with a minimum area of
18 x 18 inches. The antenna should be mounted a minimum of two feet away from GPS
antennas.
The comm antenna should also be mounted as far apart as practical from the ELT antenna,
preferably one on top and the other on the bottom of the aircraft fuselage. Some ELTs have
exhibited re-radiation problems generating harmonics that may interfere with GPS signals.
This can happen when the comm (GX60/65 or any other comm) is transmitting on certain
frequencies such as 121.15 or 121.175 MHz, which may cause the ELT output circuit to
oscillate from the signal coming in on the ELT antenna coax.
The antenna coax cable should be made of RG-142B or a comparable quality 50Ω coax.
Assembly instructions for the rear coax connector are included in Figure 6.