Highfields Amateur Radio Club
Constructors Corner.
smoking soldering iron
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Home build an OPC-298 cable.
By Brian, MW0GKX.

This lead is used for connecting the EX-704 Programmer to some of the radios that the EX-704 Programmer is used for and also as the connecting lead between some radios and the EX-1196 level converter when programming from a PC.

Parts List:

1 × 2.5mm stereo jack plug.
1 × 8P8C plug.
As much twin core cable as is required for the length of the finished lead (a metre or so should be plenty).


Assemble as shown diagrammatically below, the sleeve connection of the jack plug going to pin 4 of the modular plug and the ring of the jack plug to pin 7 of the modular plug. The tip connection of the jack plug is not used.

Don't forget to put the cover of the jack plug on the cable before soldering (I've forgotten too many times myself)! The modular plug is shown with the connection pins toward you, the locking tongue away from you.

cable layout

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