Good day again and time for more theoretical questions (as I still don’t have the aircraft or PAW…yet). I’m posting this here, instead of the MGL Forum because I’m pretty sure there will be people here who’ve done what I want but not necessarily on the other forum with the PAW.
This time I’m trying to get my head around combining the audio outputs from the PAW and an EFIS (MGL iEFIS Lite) into a single input to a Trig TY91 radio. Can it be done and, if so, can anybody give a step-by-step idiots guide (and it does need to be that for me). The MGL manual talks about using ‘general audio wiring techniques’ and I have no idea what that means, so let’s assume that level of stupidity on my part.
I know the PAW has the 3.5mm female jack port and this sends out alerts. I suppose my first question is does that 3.5mm jack lead to a single wire or are there two (I assume for stereo)?
The MGL EFIS has a 9 pin connector on the back and a male pin for audio. The manual says:
PIN 3 – Audio. This line contains a 0dBV level audio system for voice and other Annunciations. This output has a 1KOhm output impedance and should be connected to a standard audio input of an aircraft intercom system.
Audio output
The Lite features an audio output that can output standard iEFIS voice annunciations and sounds to intercom system.
The audio level is standard 2Vpp (0dBV) signal with about 1KOhm output impedance.
The output is not designed to drive headsets or speakers directly. It needs to be amplified. This typically forms part of the intercom system. Wire the output using general audio wiring techniques to a suitable input of the intercom system.
Inputs should be chosen that allow adjustment of audio levels and that will mute the input when radio transmissions are received.
So, would the Pin 3 (male) be connected to a specific type of audio cable or would any type of cable suffice? Would you somehow wire it up to two wires?
The Trig TY91’s manual tells me:
5.6.9 Auxiliary Audio Input
This input is continually routed to the headphone and cabin speaker outputs. It is intended for annunciators and identification tones.
Note: The audio bandwidth on the auxiliary input is limited, and is not ideal for MP3 players or other entertainment inputs. If such a device is connected, the mute settings should be enabled in configuration mode so that radio reception and transmission takes priority over the music input.
That seems okay but it is a single input (female) into a 25 pin connector.
So, if any of you chaps out there would be kind enough to explain in chimp language how I wire up a PAW 3.5mm output and a male single ‘prong’ output to, somehow, go into the single (female) input of the TY91 I would be most grateful.
BTW, I have Googled things and found you can combine two 3.5mm jacks etc but that doesn’t help me too much. However, I shall continue to investigate rather than just relying on everyone else to lead me by the hand.
Cheers.