SGPropertyNode *fnode = node->getChild("frequencies", 0, true);
_source_node = fnode->getChild("source", 0, true);
_frequency_node = fnode->getChild("selected-mhz", 0, true);
SGPropertyNode *fnode = node->getChild("frequencies", 0, true);
_source_node = fnode->getChild("source", 0, true);
_frequency_node = fnode->getChild("selected-mhz", 0, true);