ECHOTEST is a facility on all DMR MARC repeaters, to use it you can program a channel on your local repeater with:
ECHOTEST TG9990 Slot 2,
In your Group Contacts add ECHOTEST 9990.
To use, select the ECHOTEST channel on your local repeater, key-up and speak - 'G7HID testing' (or whatever), de-key and a few seconds later your speech should be repeated back to you.
Another way of programming for use on any DMR MARC repeater is to:
Add ECHOTEST 9990 to your Group Contact List.
Check you alias name you use for LOCAL TG9 S2.
In the CPS select Conventional, DMR Services, Rx Group List.
Edit the list to add your alias for LOCAL TG9 and ECHOTEST 9990
Save the list and if required re-name it.
Now in each of your required LOCAL TG9 S1 select the Rx Group List
Select your Rx Group List
In General setting select One Touch Call
Under 'Number Key Quick Access', in Number Key '0'
Edit to Read: 'Call', 'Digital', 'ECHOTEST 9990', 'Group Call', 'None'
Save all the above to Codeplug and radio.
To use, on a repeater select LOCAL TG9 S2, press Key '0' for a couple of seconds until asked to TX,
key-up and speak - 'G7HID testing' (or whatever), de-key and a few seconds later your speech should be repeated back to you.