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--- radios:gm350 [2024/07/25 23:24] – gm5aug
+++ radios:gm350 [2024/08/30 14:35] (current) – added section re use with Tiny-2 TNC gm5aug
@@ Line 52: / Line 52: @@
 | 15 | RSSI | received signal strength indicator (analogue voltage) | |
 | 16 | EXT SPKR + | +ve connection for an external speaker | |
+===== Usage with Tiny2 TNC (PacCom) =====
+While the radio is known to work with the newer NinoTNCs, this radio also works with older TNCs such as the Tiny2. GM5AUG has found that not all GM350s are created equal: some will accept the flat audio in/out, and some don't. There is a way to discern this from serial numbers which I will add later.
+For now, though, it is worth noting that older modes (such as 1k2bd AX.25) will work through the non-flat audio in/outs. Future NinoTNC modes that allow faster speeds over mic/speaker connections should work equally well, meaning that even if your GM350 does not have the flat audio in/out, all is not lost.
+Michael's configuration of his Motorola GM350 and Tiny-2 TNC worked as follows:
+^ Motorola pin ^ Purpose ^ Tiny-2 TNC pin ^
+| 2 | Audio (non-flat) input into radio | 1 |
+| 3 | Radio PTT | 3 |
+| 7 | Ground | 2 |
+| 16 | Audio (non-flat) output from radio | 4 |
+Note that his radio is one of the ones that does not allow flat audio in/out. More information about the Tiny-2 pinout can be found here((https://www.manualslib.com/manual/1842710/Paccomm-Tiny-2.html?page=10#manual))
+In radio programming, Michael found that the `Fixed Volume` option (found under 'Edit' -> 'Per Radio) needed to be set to ~250 to give the receive audio enough drive.
+Under the `GP I/O` settings, GPIO pin 7 needed to be set for PTT (Low).