I' ve modified the terrestrial.xml file but doesn't work, no channel found
Code:
<transponder centre_frequency="474000000" bandwidth="0" constellation="0" code_rate_hp="0" guard_interval="0" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="1" code_rate_hp="0" guard_interval="0" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="2" code_rate_hp="0" guard_interval="0" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="0" code_rate_hp="1" guard_interval="0" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="1" code_rate_hp="1" guard_interval="0" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="2" code_rate_hp="1" guard_interval="0" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="0" code_rate_hp="2" guard_interval="0" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="1" code_rate_hp="2" guard_interval="0" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="2" code_rate_hp="2" guard_interval="0" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="0" code_rate_hp="3" guard_interval="0" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="1" code_rate_hp="3" guard_interval="0" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="2" code_rate_hp="3" guard_interval="0" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="0" code_rate_hp="4" guard_interval="0" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="1" code_rate_hp="4" guard_interval="0" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="2" code_rate_hp="4" guard_interval="0" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="0" code_rate_hp="0" guard_interval="1" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="1" code_rate_hp="0" guard_interval="1" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="2" code_rate_hp="0" guard_interval="1" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="0" code_rate_hp="1" guard_interval="1" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="1" code_rate_hp="1" guard_interval="1" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="2" code_rate_hp="1" guard_interval="1" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="0" code_rate_hp="2" guard_interval="1" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="1" code_rate_hp="2" guard_interval="1" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="2" code_rate_hp="2" guard_interval="1" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="0" code_rate_hp="3" guard_interval="1" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="1" code_rate_hp="3" guard_interval="1" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="2" code_rate_hp="3" guard_interval="1" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="0" code_rate_hp="4" guard_interval="1" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="1" code_rate_hp="4" guard_interval="1" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="2" code_rate_hp="4" guard_interval="1" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="0" code_rate_hp="0" guard_interval="2" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="1" code_rate_hp="0" guard_interval="2" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="2" code_rate_hp="0" guard_interval="2" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="0" code_rate_hp="1" guard_interval="2" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="1" code_rate_hp="1" guard_interval="2" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="2" code_rate_hp="1" guard_interval="2" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="0" code_rate_hp="2" guard_interval="2" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="1" code_rate_hp="2" guard_interval="2" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="2" code_rate_hp="2" guard_interval="2" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="0" code_rate_hp="3" guard_interval="2" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="1" code_rate_hp="3" guard_interval="2" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="2" code_rate_hp="3" guard_interval="2" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="0" code_rate_hp="4" guard_interval="2" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="1" code_rate_hp="4" guard_interval="2" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="2" code_rate_hp="4" guard_interval="2" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="0" code_rate_hp="0" guard_interval="3" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="1" code_rate_hp="0" guard_interval="3" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="2" code_rate_hp="0" guard_interval="3" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="0" code_rate_hp="1" guard_interval="3" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="1" code_rate_hp="1" guard_interval="3" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="2" code_rate_hp="1" guard_interval="3" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="0" code_rate_hp="2" guard_interval="3" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="1" code_rate_hp="2" guard_interval="3" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="2" code_rate_hp="2" guard_interval="3" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="0" code_rate_hp="3" guard_interval="3" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="1" code_rate_hp="3" guard_interval="3" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="2" code_rate_hp="3" guard_interval="3" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="0" code_rate_hp="4" guard_interval="3" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="1" code_rate_hp="4" guard_interval="3" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="2" code_rate_hp="4" guard_interval="3" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="0" code_rate_hp="0" guard_interval="3" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="1" code_rate_hp="0" guard_interval="3" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="2" code_rate_hp="0" guard_interval="3" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="0" code_rate_hp="1" guard_interval="3" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="1" code_rate_hp="1" guard_interval="3" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="2" code_rate_hp="1" guard_interval="3" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="0" code_rate_hp="2" guard_interval="3" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="1" code_rate_hp="2" guard_interval="3" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="2" code_rate_hp="2" guard_interval="3" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="0" code_rate_hp="3" guard_interval="3" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="1" code_rate_hp="3" guard_interval="3" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="2" code_rate_hp="3" guard_interval="3" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="0" code_rate_hp="4" guard_interval="3" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="1" code_rate_hp="4" guard_interval="3" transmission_mode="0"/> <!--ch21 -->
		<transponder centre_frequency="474000000" bandwidth="0" constellation="2" code_rate_hp="4" guard_interval="3" transmission_mode="0"/> <!--ch21 -->
Why?