Duplexers and Diplexers for Amateur Radio Operators
Find schematics and construction guides for duplexers and diplexers to combine or separate VHF, UHF, and other frequency bands.
Duplexers and diplexers are essential components for many ham radio stations, allowing operators to use multiple bands or transceivers with a single antenna and coax feedline. These devices manage different frequencies on the same cable, which is particularly useful for VHF and UHF operation, including satellite work or repeater installations. They ensure proper isolation between bands, preventing interference and maintaining signal integrity for simultaneous transmit and receive.
Hams often homebrew these filter networks for specific antenna projects, designing them for optimal performance on bands like 2 meters and 70 centimeters. Resources in this category provide schematics and construction notes for building low-cost UHF/VHF duplexers and diplexers. Operators can find detailed design principles, such as those based on Butterworth filters, and practical examples for achieving good port isolation and low insertion loss, like the G8MNY 144/432MHz diplexer.
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This DIPLEXER separates 2m from 70cm on the same coax cable, and allows to use 2 antennas over the same cable and permits transmission on one band and simultaneous receiption on the other band by hb9abx -
Standard diplexer design is based on singly-terminated Butterworth filters. -
A full duplex antenna system for 144 432 Mhz -
Learn a little bit about how duplexers work and building your own. -
Diplexer is a passive device, a special filter circuit that seperates 2 different bands, not to be confused with the duplexer that usually separate 2 different frequencies on the same band. -
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Make yourself a Diplexer