possibly the  RT systems cable   , if the chirp  build  was done using another cable as RT claim their cables are  somehow custom,  but  how much is fact and how much is  hype .. 

On Wed, 2 Sep 2020 at 18:00, Bill A via chirp_users <chirp_users@intrepid.danplanet.com> wrote:
hi all
I have a ic207h and a rt systems cable usb 29a cable.
but when I try to commute with the radio I get a error message cannot read from radio ?
any suggestions

thanks Bill kc4jqh
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