Portable three‑module minirack for Wisycom wireless systems. The RPT923 accepts one MSR918 receiver module, one CST910 transmitter module, and one PSS902 power supply module. It provides mains or DC power, supports RF-active antenna powering for receiver diversity, and exposes the two RF antenna inputs, transmitter antenna output, GPI, AF intercom line output, AF main line output, and master transmitter option when used with CST910 in iso‑frequency configurations.