How can I mute/unmute transmit on a PTP 820(x)?

In the PTP 820(x) GUI, navigate to Radio/Radio Parameters.  For PTP 820C/G, select the radio you want to mute or unmute and click Edit. The Radio Parameters page opens.  For PTP 820S, the Radio Parameters page opens immediately when you select Radio/Radio Parameters.  Scroll to the Configuration Parameters section of the Radio Parameters page.

Select TX mute On to mute the radio. Select TX mute Off to unmute the radio. Press Apply to activate the configuration changes.