Connecting the Daniels MT-2 VHF Transmitter modules:

The "D" column is not connected. I would not say that it is safe to make connections to those pins though, just that the manual does not list any connections to them. "No connection" and "DONT CONNECT" aren't the same thing.

The VHF and UHF modules show identical connections.

The rear panel connector is a DIN standard connector, with three columns of even numbered pins, numbered from 1 to 32.
The three columns are labeled on the connector, "D", "B", and "Z", at the top. The pins are numbered on the right side, but only the rightmost digit shows, so you see this:

D B Z O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O

Row Number 2 4 6 8 0 (should be 10) 2 (should be 12) 4 (should be 14) 6 (should be 16) 8 (should be 18) 0 (should be 20) 2 (should be 22) 4 (should be 24) 6 (should be 26) 8 (should be 28) 0 (should be 30) 32

Power to the transmitter module is the same as the receiver modules, with the addition of a 12V input on pins B2 and Z2.
All the input pins have EMI filter networks that consist of a series inductor and 330pF cap to ground.

Control signals are all low true, so you ground KEY to transmit, and COR goes low to indicate presence of a signal.

Function	Pin(s)	Comment
Ground	B30,Z30,B22,Z22
+9.5V in	B6, Z6
B-System	B16,Z16	Jumper inside the RX connects this point with B6,Z6
6.0Vdc out	Z4
+12V in	B2,Z2	3A fast blow fuse inside module
TXAudio	B20	Unbalanced input
TX Audio Enable	B12,Z12	Runs to jumper JU2 where you can connect this signal to the transmitter, or just ground this line into the transmitter. Grounding this line enables the audio
PTT no time out	B14,Z14	Ground to transmit, timeout set by jumper selection
Line In	B18 to Z18	Optional balanced audio input, if you have this, you'll see a quarter-sized transformer on the PCB
Tone/Digital input	Z20	Looks like an unfiltered/limited input for DPL or data?
Subtone input	B22	CTCSS input
PTT with timer	B10,Z10	Ground to transmit.

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