Hello everyone, I have a new guy problem. I am using a Tera tr-505 to transmit to a Midland base camp xt511. I can't get the 505 to transmit until the base camp transmits first. When I transmit with the 505 there is a hum on the base camp and thats it. If I hit the push to talk on the base camp then my 505 can transmit to the base camp no problem. I odd thing, if I turn both radios off then on the 505 will transmit to the base camp, once I change channels no go. I must have touched a setting or something simple. If anyone can steer me in the right direction that would be great. Thanks.