I recently acquired a used Kenwood TK-880 from ebay and I have programmed a few channels into it with the KPG-49D version 4.02 software. All of the programmed channels will transmit without any problem and be received by another radio, but when I transmit from the other radio I get nothing at the TK-880. The LED does not come on when it should be receiving and the it remains absolutely silent as if nothing at all is being transmitted to it. The radio emits beeps when buttons are pushed so I don't think there is a problem with the speaker. I've double checked my programming (TX and RX freqs are the same, no CTCSS codes set, etc.). The microphone, antenna, and coax cable that came with the radio are also used so should I be concerned there is a hardware problem, or is there possibly an identifiable problem I'm overlooking with my programming that might be causing the Will TX / Will Not RX issue?