Description The DPF 2/6… is a 6-cavity duplex filter for duplex radiotelephones. This duplexer is delivered in a low band version type DPF 2/6 L, tunable within 138 – 156 MHz and a high band version type DPF 2/6 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 2/6… 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 coated with black vinyl to prevent corrosion. Specifications Electrical Model DPF 2/6… Frequency DPF 2/6 L : 138 – 156 MHz DPF 2/6 H : 152 – 175 MHz Max. Input Power 50 W Insertion Loss Tx-Ant and Ant-Rx Single-channel tuned: < 1.2 dB (typ. 1.0 dB) Multi-channel tuned, 1.5 MHz BW: < 1.2 dB (typ. 1.0 dB) Tx-Noise Suppression on Rx-Frequency Single-channel tuned: > 80 dB Multi-channel tuned, 1.5 MHz BW: > 60 dB Rx-Isolation on Tx-Frequency Single-channel tuned: > 80 dB Multi-channel tuned, 1.5 MHz BW: > 60 dB Impedance 50 Ω Duplex Spacing 4 – 10 MHz (adjustable) VSWR < 1.5:1 Mechanical Connection(s) N female BNC(f), TNC(f), UHF(f), SMA(f) on request Dimensions Approx. 211 x 154 x 33 mm / 8.31 x 6.06 x 1.30 in. Weight Approx. 0.94 kg / 2.07 lb Environmental Operating Temperature Range -30°C to 60°C Frequency Stability 5 ppm/° C (approx.) Diagram and Mounting Typical response curves @ 4 MHz duplex spacing Typical response curves @ 8 MHz duplex spacing Mounting
