You dont. You need to supply an external (digital logic) signal from your receiver or an external CTCSS decoder into the
"CTCSS" input of the RTCM.
> From: bill.hurlock@cpcomms.com
> To: app_rpt-users@ohnosec.org
> Date: Tue, 19 Mar 2013 18:17:25 +0000
> Subject: [App_rpt-users] ctcss decode settings
>
> I'm using a RTCM for my radio interconnect. I have the encode CTCSS encode working fine. How do I setup the CTCSS decode on the RTCM so I can use Tone SQ? I have audio coming from the discriminator direct.
>
> Bill Hurlock
> CPCommunications
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