US Patent 10419066 Remote radio frequency (RF) AGC loop

Approaches for supporting a RF automatic gain control (AGC) loop. A first module and a second module are coupled together via a single RF transmission cable. The first module might be a Remote PHY Device (RPD). The second module may comprise a power amplifier. Both the first and second module operate on a single automatic gain control (AGC) loop. The first module sends a first signal to the second module over the single RF transmission cable at a first frequency or frequency range. The first module may adjust a gain of the AGC loop based on a second signal sent from the second module to the first module over the single RF transmission cable. The second, counterpropagating signal has a different frequency or frequency range than the first frequency of the first signal, e.g., the second frequency or frequency range may be lower than that of the first frequency.