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4QD controllers
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The DMR-203 can be used with one or two Pro-150 controllers. Wiring is simple, though not quite as simple as with Pro-120 or VTX.
Pin D of the 6 way control connection (Connector C, Pro-150 instructions, page 5) is the pot top connection from the controller. On VTX and Pro-120 this feeds approximately 8v to the pot - or the DMR - and the DMR draws its power from here.
The Pro-150 is a digital controller so the voltage here is only 5v. This dows not give enough to operate the DMR properly, so an alternative suply must be used.
+12v may be easily brought out to pin A of the display connector (connector D, Pro-150 instructions, page 14) this pin is marked as 'spare' and is not connected internally.
The diagram shows the corner of the board where the display and programming connectors are soldered: link the two marked pads with a solder-bridge.
Beware: the 12v supply is not protected. If you draw too much current from this point the dropper transistors (on the same edge of the board) may get too hot and may fail. This could cause major damage.
Wiring is then as shown in the diagram. Note the 10k resistors fitted in place of the pot track (between pins D and F) - without these, a pot fault will be detected.
If it simplifies your wiring, 0v (green wire) may be connected to the auxiliary connector (connector A) pin A which is the main 0v. Beware that this connection is not protected by a fuse track, as is the normal connection on connector C.
You will of course need to reprogram the Pro-150s as explained in the instruction manual for operation with the DMR. The standard programming works, but is unlikely to be what you require.
You may like to let us know what programming you use (use the 'Contact' button above): if there is a pattern we could pre-program a spare personality to suit.