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DPF 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.
Specification
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
Environmental
Frequency Stability 9 ppm/° C (approx.)
Operating temperature range -30 °C to +60 °C
Mechanical
Connection(s) N(f) (Others on request)
Historic Brand Procom
Dimensions 168 x 208 x 33 mm /
6.61 x 8.19 x 1.30 in.
Weight Approx. 1.06 kg / 2.34 lb.
Ordering Codes
Model Product No.
8-Resonator Duplexer for the 80 MHz Band 200001618
Additional Information
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

PROCOM A/S reserves the right to amend specifications without prior notice
PROCOM A/S • Smedetoften 12 DK 3600 Frederikssund • Denmark
Generated : 2026-06-25 Version 1