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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 11-03-2010, 4:58 PM
  Audio Feed Provider
Audio Feed Provider
Join Date: Dec 2008
Location: Burlington County, NJ
Posts: 15
Default Programming Question ICOM F4021

Hello Everyone!

We recently purchased several ICOM F4021 radios and programming cable for use as fireground radios.

They work FANTASTIC except...

I can't change channels when the external Speaker/Mic is attached.

Anyone know how to fix this???


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Old 11-14-2010, 5:40 AM
grumps96's Avatar
Join Date: May 2010
Location: Massachusetts
Posts: 76

Hi, I am not sure you have a programming issue. Are you usig an approved microphone/speaker IE a
HM158L or HM159L, or do you have a remote with channel up/down buttons? I do not think that type of remote will work with the F4021.
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