DISTRIBUTORS, INC.
The ICS PTT could be a secondary button on a yoke or stick to activate ICS only, or a momentary
button on the panel that is pushed in to speak on the ICS and then released. PTT ICS works well in
louder aircraft (open cockpit for instance) and VOX ICS is tailored for quieter environments.
Bottomline – the Sidetone and ICS volume levels are one and the same. To adjust them, enter the
Setup Mode (hold down the MOD button while powering up the radio) and toggle to the “Audio
Level of Intercom” screen (Page 11 of the Operations Manual) and increase the value there. The
scale again is 0 – 80 and factory default is approximately 60.
Q: My FL-760A powers up and receives ATIS but will not transmit.
A:
Check the connections/continuity between “Pilot PTT” Pin 7 on the radio connector harness
and the tab on the Pilot Mic Jack that corresponds to the Tip, as well as “Electret, Amplified
Dynamic (Pilot)” Pin 1 on the radio connector and the tab on the Pilot Mic Jack that corresponds
to the Ring of the Mic Plug. The tip is the PTT segment that gets grounded when you push the
radio PTT button. This triggers the transmitter to activate; the ring is what the headset mic audio
comes in on and that is sent to the transmitter to modulate it and allow your voice to be
broadcast over the radio.
If you sourced a prewired harness from a third party such as Aircraft Spruce & Specialty, we’ve
discovered that there may have been a number of harnesses sold in the Mid 2019 (estimate July-
Sept 2019)timeframe that had the tip and ring wires on both the Pilot and Co-Pilot Mic Jacks
swapped. PTT was tied to the Ring and Mic Audio was running through the Tip. This was wrong
and will result in no transmitting of the radio. If you investigate and find you have a mis-wired
harness sourced from Aircraft Spruce, please contact them for a replacement. They have assured
us any mis-wirings have been rare and they are anxious to make it right and make sure you are
satisfied as a customer.
In some circumstances, you can send in your harness for evaluation. The cost for the wire harness
evaluation is $35 USD.
_________________________________
12830 E. Mirabeau Parkway, Spokane, WA 99216●(800)235-3300
●LOCAL (509)535-8280●FAX (509)535-8266