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5.6 Electrical installation
・ Single seat sailplanes:
Power, speaker, microphone (prefer electret), PTT located on control column, backlight switch
or volume (for viewing)
・ Two place sailplanes:
Additional wiring should include the memory toggle switch for the rear seat, rear PTT switch
and microphone.
・ Motor Glider:
Jack for headset microphone and speaker.
・ Ultralights / Microlights:
Power, Speaker (not for open cockpit design), PTT located on control column, headset
microphone (prefer electret), backlight switch or volume, antenna coax type RG58U
(recommend vertical 1/4 wave antenna with ground plane).
・ Tandem/ side by side:
Additional rear seat PTT and headset wiring, memory toggle switch, intercom switch.
Having run all the wires we will now terminate them. First connect the power cable to a
14-volt or 28-volt source. It is advisable to run this via a circuit breaker or fuse (2-amp max).
NOTE-
The FL-760A has an internal 10 amp fusible link which is not field replaceable. If the
radio fails it must be returned to a Flightline approved repair facility.
RED is POSITIVE! (Pins 9 and 10) GROUND (Pins 11 and 12)
It is advisable to connect the power cable through a radio master switch and not direct to the
battery. Solder the PTT cable to the J001 with the shield connected to ground and the center
conductor to pin 7. The other end of the cable should be connected to the common and normally
open contact on the push button switch. If using two switches simply wire them in parallel.
Now solder the microphone cable center conductor to pin 3 or 1 (both if two mics are used) on
the J001 socket and the shield to ground (Pin2).
You can now connect the microphone. If using an electret mic please check that the red wire is
connected to the center conductor as these are polarity sensed and reverse polarity will
severely damage the mic.
If using two microphones then wire to the 2 separate inputs. NOTE both mics are active on
transmit. For pilot/copilot isolation order the optional relay board.
Now connect the backlight switch using two wires, one to ground and the other to pin 8.
You can use volume instead of backlight switch (for brightness adjustment). The switch
(volume) is wired center conductor to common and the other side to ground.
THIS IS NOT A
MOMENTARY SWITCH, it needs to be switched on or off.
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