Highfields Amateur Radio Club
Constructors Corner.
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Home build an OPC-474 cable.
By Brian, MW0GKX.

For the PC to Icom data cable see: Icom OPC-478 / OPC-552 PC Cloning / CI-V cable page.

Most recent Icom radios use an OPC-474 cable for cloning data between two same model Icom radios. Ideal if you have a pair of radios, 1 indoors and 1 in the car, or a pair of handies, or your friend buys the same radio that you've got and asks you to program the memories (cheat, but hey! let's make life easy!), for example, and want to copy all the settings etc. Here are instructions to make one but before you start have you got a 3.5mm stereo to 3.5mm stereo jack plug intrerconnecting lead? (I have one for the audio from the PC to the speakers on the monitor) If so you can use that. If not read on and save around £10…

If using a fully wired (stereo capable) lead for cloning Icom radios ensure that the volume on BOTH transceivers is at the lowest setting.

Alinco tend to state that a 3 wire cable is to be used when, in many cases, only the ring and sleeve are used (there are exceptions where all 3 wires are used though). It can't hurt to have a fully wired cable but a good idea to follow the advice for Icom above.

I've been asked will this lead fit the IC-nnn? Well perhaps I should have given a list rather than "Most recent Icom radios…", see Useage below for the ones that I have listed and reproduced the instructions for (if your manual says it is the correct lead and has instructions but is not listed below, please contact the wbmaster so it can be included).

I've also been asked (possibly because there's nothing to it to justify the shop prices for the lead, just 2 plugs and a bit of cable) "Does it work?" Well I've used it on a pair of IC-2725s and a pair of IC-T3s and it did.

This lead will also fit some Alinco radios and some Yaesu radios.

Parts List:

2 × 3.5mm stereo jack plugs.
As much single core shielded (or 2 core and shield) (or similar) cable as is required for the length of the finished lead.


Assemble as shown diagrammatically below. Use the shield of the cable (if shielded) for the outer (Black) connection and don't forget to put the covers of the jack plugs on the cable before soldering (I've forgotten too many times myself)!
The Red and Black are required, the dashed Blue can be added to give the cable use as a stereo patch lead as well.
cable layout


Listed radios may not be Amateur Radio Service radios. Some radios may require an adaptor to use the OPC-474, this will be noted on the relevant page.

Just select your radio from the list below for the cloning instructions. This is not a gauranteed complete list, others will be added as I discover them or as people let me know.

IC-2100, IC-2200, IC-2300, IC-2720, IC-2725, IC-2820,

IC-A4, IC-A6,
IC-A14, IC-A14S, IC-A24,


IC-F11, IC-F11S, IC-F12, IC-F12S, IC-F21, IC-F21S, IC-F22, IC-F22S,

IC-T2, IC-T3, IC-T8,
IC-T81, IC-T90.


IC-V80, IC-V82, IC-V85,

ID-800, ID-E880.

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