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DPF 70/4

Duplex FiltersDPF 70/4

4-Cavity Duplexer for the 450 MHz Band

Description

  • The DPF 70/4… is a 4-cavity duplex filter for duplex radiotelephones.
  • The DPF 70/4… can be adjusted within the complete
    406 - 470 MHz band. The duplexer can be delivered in four different versions according to required duplex spacing. See also “Ordering information” below.
  • The DPF 70/4… is primarily intended for equipment, where the Tx and Rx operate on single frequencies, but it 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 uses full-length ¼ cavities in a compact, extruded aluminium housing. The chassis is made of passivated steel, and teflon insulation has been applied in the coaxial cables and in the connectors.
  • The filter is black vinyl coated to prevent corrosion.

Specifications

Electrical
Model DPF 70/4...
Frequency 406 - 470 MHz
Max. Input Power 50 W
Special spec. info Single-channel tuned: Multi-channel tuned,
BW = 2 MHz:
Insertion Loss Tx-Ant and Ant-Rx < 1.0 dB (typ. 0.8 dB) < 1.2 dB (typ. 1.0 dB)
Tx Noise Suppression on Rx Frequency > 60 dB > 45 dB
Isolation Rx on Frequency Tx > 60 dB > 45 dB
Impedance 50 Ω
VSWR < 1.5:1
Mechanical
Connection(s) N(f)
(BNC(f), TNC(f), UHF(f) or SMA(f) on request)
Dimensions 226 x 104 x 33 mm /
8.9 x 4.1 x 1.3 in.
Weight Approx. 0.69 kg / 1.52 lb.
Environmental
Operating temperature range -30 °C to +60 °C
Frequency Stability Approx. 4.5 ppm / °C

Diagram and Mounting

TYPICAL RESPONSE CURVES

Ordering Designations

Model Product No. Frequency
DPF 70/4-5/7 N(f) 200000301 5 - 7 MHz
DPF 70/4-7/9 N(f) 200000304 7 - 9 MHz
DPF 70/4-9/13 N(f) 200000310 9 - 13 MHz
DPF 70/4-13/16 N(f) 200000294 13 - 16 MHz

Typical response curve

dpf 70 4 resp art GB

PLEASE NOTE

Special configurations of this filter type may be quoted on request. For instance, the filter can be delivered with other connector types, or with flying leads (RG 316 coaxial cable) terminated with connectors or for soldering-connection.

ORDERING INFORMATION

When ordering, please use the table above to select the appropriate ordering designation for the desired filter type. If duplex Tx and Rx frequencies are stated when ordering, the duplexers are delivered factory adjusted. If Tx and Rx frequencies are not stated, the filters are delivered non-adjusted.

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