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DPF 4/8 S-4/13

Duplex FiltersDPF 4/8 S-4/13

8-Resonator Duplexer for the 80 MHz Band

Description

  • The DPF 4/8 S-4/13 is an 8-resonator duplex filter for duplex radiotelephones.
  • This filter is primarily intended for equipment, where the Tx and the 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 duplexer can be tuned within the complete 66 - 88 MHz range with a duplex separation between 4 and 13 MHz.
  • The filter has very small physical dimensions owing to the use of high-Q, temperature compensated helical resonators with discrete-component interconnections.
  • The housing is made of extruded aluminium, the chassis of passivated steel, and the connectors are provided with teflon insulation.
  • The filter is black vinyl coated to prevent corrosion.

Specifications

Electrical
Model DPF 4/8 S-4/13
Frequency 66 - 88 MHz
Max. Input Power 50 W
Special spec. info Single-channel tuned : Multi-channel tuned,
BW = 1.4 MHz :
Insertion Loss Tx-Ant and Ant-Rx ≤ 1.0 dB ≤ 1.2 dB
Tx Noise Suppression on Rx Frequency > 100 dB > 60 dB
Isolation Rx on Frequency Tx > 100 dB > 60 dB
Impedance 50 Ω
Duplex Spacing 4 - 13 MHz (adjustable)
VSWR ≤ 1.5:1
Mechanical
Connection(s) N(f) (Others on request)
Dimensions 168 x 208 x 33 mm /
6.61 x 8.19 x 1.30 in.
Weight Approx. 1.06 kg / 2.34 lb.
Environmental
Operating temperature range -30 °C to +60 °C
Frequency Stability 9 ppm/° C (approx.)

Ordering Designations

Model Product No.
DPF 4/8 S-4/13 N(f) 200001618

Please Note

Special configurations of this filter type may be quoted on request. As an example, the filter can be delivered with the resonators stacked 4 over 4, thereby accomodating special space restrictions. In this case the filter designation is DPF 4/44 S.

Typical Response Curves @ 4 MHz Duplex Spacing

DPF 4!8S 4!13 Curve

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