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VHF UHF Duplexer

Using a VHF UHF Duplexer in your home or business can provide a simple way to keep your phone lines connected to each other without having to use the wired telephones. But there are a few things you need to know about these types of wireless communication devices.


Isolates receivers from transmitters

Generally speaking, a duplexer like the Microwave Duplexer is a three-port filtering device that allows you to send and receive two different frequencies on one antenna. Although it can be a hassle with multi-channel systems, it works great for single channel systems.

The radio spectrum has a lot of noise. A few of the sources include power lines, industrial equipment, and man-made noises like solar flux. You must be mindful of this and properly isolate your receiver. The best performance of your receiver is determined by the minimum noise floor.

The best way to do this is to install a top-notch preamp. It's crucial to use one that can manage strong signal levels without signal distortion. This is crucial for repeaters in particular.

Additionally, you must gauge the noise floor. There are many ways to accomplish this, but the absolute minimum is 10 dB.

Why choose Hefei Topwave VHF UHF Duplexer?

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Pass-notch cavities can cause unexpected problems

Base station duplexer filter employ typical pass-notch cavities. However, mobile duplexers can also use these cavities. Unfortunately, they sometimes lead to unpleasant surprises.

In base station duplexers, pass-notch cavities are used to pass one frequency while rejecting the other. Between the radio and the antenna, these cavities are arranged in a series. The coupling loops inside the cavity have different lengths. They range from five to six inches. The distance between the antenna "T" fitting and the end cavities for the cables varies as well.

The frequency and wavelength of the signal determine the lengths of the cables. The connectors and coupling loops in the cavity have various lengths as well. The cavity's Q may be impacted by this.

For instance, a short cable between the TEE and connector may be present in a low frequency pass-notch cavity. The rod may tune unevenly as a result of this. Additionally, insertion loss can alter the cavity's Q.

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