The radio seems to work fine, the tower says I am loud and clear and I seem to hear everyone else nice and clear. There is a second path to searching through saved and recent frequencies, but I have't mastered that yet so I can't really describe it. Once the right one comes up, hit the flip-flop button to activate it. You can also add alpha numeric descriptions for these frequencies such as 'Atis' or 'Tower' to make it even easier to identify them. When I push it, it cycles through the frequencies that I have in memory. It has two buttons that you can program, one of which I have set to memory. I just put a GTR200 in a Christen Eagle and am very pleased with it. That way he can plan for needed accessories and specific programming.

But be sure to tell your avionics guy how it needs to be set up for you BEFORE you do the install. Once set up, you'll rarely need to do it again.

Don't be afraid to ask for help setting up a new piece of avionics. Apply power & ground, connect an antenna, and go. That's because the older radios did not need to be set up. The newer radios ARE more difficult to set up. That's the reason for a 'discrete input', do one function without dialing through a menu. Once the input is programmed, each press of the switch will cause the radio to do the programmed function. Follow the programming steps for that specific input (1 or 2) for the specific function you wish. To use the input, run a wire from the connector pin, to your push button switch, then from the other terminal on the push button to ground. On the -200 there are two discrete inputs ( Disc 1 and Disc 2). If you have a momentary push button connected to flip flop your frequencies, you just push the button.

A discrete key is simply a switch that performs one function. Too bad.Not sure what you're reading on the -200. Who are these human factors engineers? Garmin must have kept the Apollo team on board. The ancient A-20 and 21 Icom portables are the same - you just select with up/down arrows. My Narco 810 requires only one step to access a memory frequency. I am seriously disappointed - I thought this was going to be a hot radio for a J-3. Using memory circuits is only slightly less difficult than just twirling in the next frequency, like in the olden days. They directed me to the pilot guide, where, if I am reading it correctly, it says there are four discrete steps before you are ready to hit the 'transfer' key.

Softcomm intercom wiring diagrams