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Icom F121/221 No Mic Scan Bypass Plug

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wfdegon

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After an exhausting search (to no avail), for a schematic to make a bypass plug for an Icom F121 I decided to figure it out for myself. I wanted to basically use the radio as a scanner without the possibility of it being able to transmit as it is sharing a receive antenna with other receivers at a Fire Station. Didn't want to set up transmit inhibit on every channel as I have many of these radios in the fleet and didn't want a separate codeplug for it. Thought I would share.

All you need to do is jumper pins 7 and 8 together with an RJ-45 plug, which basically grounds out pin 8.
Plug it into your radio and it will now go into scan mode without a mic connected.
 

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