Bolton Technical 15 dB Coupler, 698-2700 MHz, Low-PIM, N-Female

The Bolton Technical 15 dB Low-PIM coupler (also known as a tap) is an extremely low loss, high quality coupler designed for multiple indoor antenna runs.

PIM stands for Passive Intermodulation and is measured in dBs (decibels). PIM is defined as the unwanted signal or signals generated by the non-linear mixing of 2 or more frequencies. High PIM means poor cellular reception and limited bandwidth to the end user, which in turn means lost customers to the carrier. Low PIM means strong signals with more bandwidth for more users - in other words, better signal and lower loss across your coupler, providing increased performance.

A 15 dB coupler is best used in high powered systems. It features strong passthrough, but a fair bit (15 dB) of loss at the connection.

This allows two indoor antennas to be used with a single amplifier, with the ability to focus more signal to a specific area. They allow for longer cable runs down hallways and across rooms. A 15 dB coupler is a great passthrough coupler but sacrifices some loss on the antenna being placed.