The DPL… is a 6-cavity 50 Watt duplex filter for duplex radiotelephones.
This duplexer is delivered in a low frequency split, type DPL 130,
tuneable within 138 - 156 MHz and a high frequency split, type
DPL 150, tuneable within 152 - 175 MHz.
The DPL… models are primarily intended for equipment, where
the TX and RX operate on single frequencies, but they can also, however with a slightly reduced specification, 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
silver plated high-Q, temperature compensated helical resonators.
The housing is made of extruded aluminium, the chassis of
tin plated steel, and teflon insulation has been applied in the semi rigid coaxial cables and in the connectors.
The filter is grey powder coated and tin plated to prevent corrosion. |  |