A 380-400 MHz Duplexer manufactured by Sinclair Technologies, model number MR356B-4, is on offer. Measurements were taken from the antenna port to one of the other ports (e.g. port 1, port 2, etc.) on the device while the other ports were terminated. One of the tuning screws has been broken off. Another tuning screw is bent but this does not appear to affect the operation of the unit (see photos). 

Measurements were made with cared-for, but ultimately uncalibrated, hobby-grade equipment so interpret the data presented here accordingly.

The unit has an F-BNC connector on each end. From the datasheet:

    Number of Cavities (Each Band): 3

    Max Input VSWR: 1.5:1

    Max Insertion Loss: 1.4 dB

    ImpedanceL 50 Ohms

This is a 50 Ohm device, tested in a 50 Ohm environment. It is used and in working condition, with signs of normal use and wear. The Sinclair Technologies MR356B-4 unit, shown in the photos, is the only item included in this listing. No cables, accessories or test equipment are included. Any test equipment shown is to demonstrate the operation of this device. The photos were taken on a 1 cm grid. Returns accepted only when the serial number matches the original item purchased. I will combine multiple items together to reduce shipping costs and will mail one or two business days after receiving cleared payment. 

Questions are welcome. Thanks for stopping by!