Duplex Filter 2-4 138-178 Mhz 4 cavity

Description

DPF 2/4… by Procom of Denmark 134–174 Mhz
4-Cavity Duplexer for the 160 MHz Band
The DPF 2/4? is a 4-cavity duplex filter for duplex radiotelephones.
This duplexer is delivered in a low band version type DPF 2/4 L, tunable within 138 – 156 MHz and a high band version type DPF 2/4 H, tunable within 152 – 175 MHz. These models are again delivered in 3 submodels, each dedicated to work with a certain duplex spacing. See ?Ordering information? below.

The DPF 2/4? models are primarily intended for equipment, where the TX and RX operate on single frequencies, but they can also, however with slightly reduced data, be used where the TX and RX operate on several channels, i.e. within a certain port bandwidth. In the last case, factory-tuning is recommended.
The filter has very small physical dimensions owing to the use of high-Q, temperature compensated helical resonators.
The housing is made of extruded aluminium, the chassis of passivated steel, and teflon insulation has been applied in the rigid coaxial cables and in the connectors.
The filter is black vinyl-coated to prevent corrosion.

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