How to Tune a Pass-Reject Duplexer

Learn how to tune a pass-reject duplexer the right way! In this hands-on tutorial, applications engineer Sophia Casas walks you through tuning the TPRD-4544 — a 4-cavity, 4-inch compact duplexer that enables simultaneous transmit and receive on a single antenna while maintaining proper isolation. You'll learn: ✅ Why interconnecting cable length is critical to performance ✅ The tools you need (nut driver, open wrench, tuning tool, 50-ohm load) ✅ How to tune the pass frequency (tuning rod) and reject/notch frequency (tuning capacitor) ✅ Step-by-step tuning of both the low-pass and high-pass sides ✅ How to achieve low insertion loss (~1 dB) and high isolation (75+ dB) ✅ Pro tips for locking in your settings during final tuning In this example, we tune the duplexer as a complete system. If your target frequencies differ significantly from the originals, be sure to check out our cavity-by-cavity tuning video. 👍 Like & subscribe for more RF tuning tutorials! 🌐 Visit our website to learn more about our products or to contact us: https://www.telewave.com/ #Duplexer #RFTuning #PassRejectDuplexer #Telewave #TPRD4544 #RFEngineering #TwoWayRadio #Antenna