The Telewave TPRD-4544 Pass-Reject Base Station Duplexer 400-470 MHz, provides high performance with an innovative design. By using two TPRC-4504 or 4704 Pass / Reject cavities in the transmitter and receiver path, this duplexer provides maximum TX to RX protection in the most severe RF environments. The design of this duplexer provides a bandpass characteristic with minimum insertion loss, while also providing maximum TX to RX protection.
Adjustable coupling optimizes the required attenuation for ideal RX performance. All cavity inputs are electrically shorted to ground for maximum static and noise protection. RG-214 Mil-Spec cable is used for all interconnections to ensure long life, and lowest insertion loss with maximum power handling capability. Heavy-duty materials are used in construction of this duplexer, including silver-plated tuners and beryllium copper finger stock contactors, assuring high “Q” performance with no problems due to dissimilar metals. Tuning is simple and remains stable from -30°C to +70°C, thanks to the threaded Invar rod.
All duplexers are tuned and tested with customer-specified frequencies prior to shipping. No further adjustments should be required. The positive locking mechanism allows for simple field tuning if frequency changes are required. TPRD-4544 duplexers mount on a 19” standard rack, with a panel height of 5.25”. Power handling is 250 watts. Receiver desense protection is at least 90 dB, and TX sideband suppression is at least 75 dB. With TX to RX spacing of 3 MHz or more, this duplexer can also combine two transmitters into one antenna, or feed two receivers.