AFT is a high‑pass RF filter to install between the transmission antenna (BFME connector) and the RPU500 TX Full Duplex TNC input. Offered in two fixed variants, AFT‑530 (530 MHz) and AFT‑580 (580 MHz), it provides defined high‑pass behavior to suppress lower frequencies. Other frequencies are available on request. This passive accessory helps maintain RF performance in wireless microphone systems.