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Signal Booster Accessories - Diplexers

on November 06, 2018

Welcome to the second in our series on Signal Booster Accessories! This week, we’ll be covering the handy Diplexer (also called a Combiner). The last part we covered was the Splitter - click here to read about those.

Varying Frequency Strengths

You’ve read our guide, but want more information about what exactly diplexers are and how they can help you improve the performance of your signal booster system.

Depending on the outdoor signal, certain bandwidths of cellular frequency can be stronger than others. If you are looking to maximize the amount of signal your system gives you, the odds are pretty good you are using a yagi antenna to snag the outdoor signal for it to be amplified and rebroadcast.

Unfortunately, a single yagi antenna can only point one way, and there are five major bandwidths of frequency to bring to the amplifier. Certain carriers use specific bandwidths, so if you’re looking for total carrier coverage, you’ll need help.

Enter the diplexer.

What are Diplexers?

A diplexer is much like a splitter, except it brings multiple frequencies together before it reaches the amplifier instead of splitting the amplified signal for more than one indoor antenna.

A diplexer/combiner is designed to combine two outside antennas with one amplifier or two amplifiers with one inside antenna. For areas of incredibly poor cellular signal, two directional antennas pointed at different cellular towers can provide for a much stronger signal. This solution can also allow for a cellular signal boosting set up for different types of cellular networks (ie. combining a standard dual-band system or 4G LTE system with an iDEN system or AWS system). This item has N-Female connectors and each port has a loss of 0.5dB.

When Should I Buy a Diplexer?

Diplexers are best bought when you are either trying to combine two types of bands from different carriers, or when signal is so weak that in order to get usable signal at all you have to take the strongest signal from different directions. If you find yourself in either of these situations, a diplexer can provide superior signal for a low cost.

Finally, ensure you are running 50 ohm cable, or have an adapter for it. Diplexers can only be used with 50 ohm cable.


For more reading, check out our blog posts on coaxial cables, and 50 vs. 75 ohm.


Want to learn more about cell phone boosters? Read more with our definitive guide:


How We Can Help:

Wilson Amplifiers is the leading provider of cell phone signal boosters. They amplify 3G & 4G LTE for any phone with any carrier for home, office, or vehicle.

  • Free consultation (ask us anything) with our US-based customer support (sales@wilsonamplifiers.com).
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  • Better signal or money-back guaranteed.

We want everyone to be satisfied, so we provide lifetime technical support and a 2-year warranty.

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