I have this equipment but it is not working it is showing NSP even after programming all the transmitter. After programming receiver was switched off and delivered to us. Though the program is still there does it mean that it has lost the contact with transmitter. There is also the standard repeater placed close to it. Does this thing needs repeater, as the receiver is placed close to the transmitter. If I want to buy only 1 transmitter to check if it is the fault of the reciever or transmitter how much will it cost me?