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F5021 External I/O channel select function

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MtnMike

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I understand that with the optional OPC-1939, it is possible to remotely select memory channels and remotely perform other functions. I would like to be able to do this but have no idea what to use for input. What are some examples of external devices that are used to select channels? I haven't been able to find any documentation on this from Icom or any other site.

By the way I've been using the F5021 for almost two years on both the 2 meter ham band and two part 90 frequencies I have access to. I love the radio for it's bombproofness and simplicity. From the ham side of things, the only downside is the lack of "VFO" and lack of easily adjustable squelch. But that's the price you pay for choosing a commercial radio.

Thanks for any help!
 

mmckenna

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This is often done with a DC or Tone remote unit. It consists of an interface at the radio that connects over twisted pair or telephone line, and a phone looking device at the operator position.

The interface is pretty simple, and likely you could home brew something. CPI Communications is a popular manufacturer for such things.
 

MtnMike

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This is often done with a DC or Tone remote unit. It consists of an interface at the radio that connects over twisted pair or telephone line, and a phone looking device at the operator position.

The interface is pretty simple, and likely you could home brew something. CPI Communications is a popular manufacturer for such things.
Great information. Thanks for the quick response! My installation will be mobile. Could I brew something up with an old DTMF circuit and keypad?
 

mmckenna

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I doubt it.

DC remotes use different DC voltages for control.
Tone remotes use specific single frequencies to control the radio. DTMF, using two tones at the same time won't work.

You might want to look at the different pins on that connector, there may be a way to set them up for switching to a specific channel. There should also be TX audio, PTT and RX audio. If you are looking to set up a remote control, you might be better off getting a radio that works with a remote head kit.
 

MtnMike

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Thanks again for the reply. Maybe what I'm trying to do isn't realistic. All I wanted was to add a few buttons/functions to my radio. If I can't, no big deal.
 
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