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ICOM Land Mobile Radio - Discussion forum for ICOM land mobile radio equipment such as the IC-F series radios. Please do not post amateur radio topics here.

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Old 05-26-2018, 6:01 PM
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Default IC-121S Programming & Jumper F

All,

I picked up four IC-121S at Dayton this year really cheap. Want to use 2 in a backup repeater setup with an old CAT1000 controller. Would like to use 3rd for a Kantronics 3+ digipeater and one for a spare. None of these came with OPC-617 cables, so I basically made my own with a few parts from digikey.

A few questions as I've done some research and can't find the answers.

1) There are a few sites saying I need to solder Jumper F together. What does jumper F do when soldered?

2) I have the programming software, it reads the radio, but is there any instructions on the programming software? I could not find any on the web. Lots of options in the programming software, just want to make sure I have everything.

3) Has anybody else used one of these IC-121 or 121S with a Kantronics digi? Program the 3+, hook the db9's per the pin outs and it's good to go?
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Old 05-28-2018, 10:50 AM
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I can answer #3. I am currently using a 121S as a digipeater radio with a KPC-3. I got a cable from Associated Radio. It is a Kantronics 1200b to 6PMD. also this number CAB K101 It uses the microphone jack and also a wire that goes to the speaker jack on the back. Works great.
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Old 05-28-2018, 6:24 PM
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How did you plug that CAB K101 cable into a IC-121S? It's a DB9 to 6pin DIN??? There is no DIN on the back of a 121S.
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Old 08-08-2018, 4:01 PM
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SLSRC. You plug one part of the cable I referenced above into the mic jack. The other part of the cable has a phone jack that plugs into the remote speaker jack on the back of the radio. I set the volume control to one o'clock. It works perfectly. The other end of the cable has the DB9 that goes to the KPC3+
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