What is the function of duplexer in radar?
A duplexer is an electronic device that allows bi-directional (duplex) communication over a single path. In radar and radio communications systems, it isolates the receiver from the transmitter while permitting them to share a common antenna.
What is a cavity duplexer?
Cavity diplexers are three port devices used in Tranceivers (transmitter and receiver) to separate the Transmitter frequency band from the receiver frequency band. They share a common antenna while working simultaneously at different frequencies.
What is the difference between duplexer and diplexer?
Simply put, a duplexer separates a transmit and receive path based on signal direction and can be used for same frequency signals, and a diplexers separates signals based on frequency with filters. Their operation is not interchangeable, and a diplexer could not replace a duplexer in common circuits.
What is a UHF diplexer?
Summary. A 3740 diplexer is used to combine the output from 2 UHF aerials into a single satellite cable that can then be distributed and feed into TVs or Digital Terrestrial TV receivers. The Diplexer filters out signal outside the desired range so that: Input 1: channel <=37. Input 2: channel >=40.
What is a Quadplexer?
A quadplexer is a 5-port filtering device that splits one input in to four different outputs, each with a different frequency. It can also be used the other way round and where it routes signals at four different frequencies to a single port.
What happens to duplexers after they are tuned?
The common assumption is that once a set of duplexers have been tuned and put into service you can just forget about them and let them run without ever really thinking about them again. However, over time, the tuning plungers, fingerstocks, and other components inside the cavities oxidize.
How do I tune a cavity or duplexer?
The proper way to tune a cavity or a duplexer is to use 6 dB or 10 dB 50 Ohm pads between the test equipment and the cavity or endmost duplexer can, as that ensures that pad “masks” any non-50-Ohm-impedance in your test equipment and ensures that the duplexer is really tuned to precisely 50 Ohms.
What causes duplexers to fail?
Lightning strikes can also cause the loop and tuning assemblies of duplexers to fail or perform below specifications. Duplexer being tested after refurbishing and the addition of two more cavities to create a six-cavity set.
How do you tune a duplexer repeater?
Some repeater owners attempt to tune their duplexers using the simple method of hooking a couple of radios to their duplexer, using one to transmit and one to receive, and simply tuning for the highest s-meter reading on the receiver for the pass frequency and the lowest s-meter reading for the notch frequency.