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DPF 4/6 S

6-Resonator Duplexer for the 80 MHz Band
Description
  • The DPF 4/6 S-… is a 6-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 filter can be tuned within the complete 66 – 88 MHz range with a duplex separation between 4 and 13 MHz.
  • The filter has very small 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 coated with black vinyl to prevent corrosion.
Specification
Electrical
Model DPF 4/6 S-…
Frequency 66 – 88 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
< 1.2 dB< 1.3 dB
Spacing 3 – 16 MHz (see table)
Tx Noise Suppression on Rx Frequency
> 80 dB> 40 dB
Isolation Rx on Frequency Tx
> 80 dB> 40 dB
Impedance 50 Ω
VSWR < 1.4:1
Environmental
Frequency Stability Approx. 9 ppm / °C
Operating temperature range -30 °C to +60 °C
Mechanical
Connection(s) N(f) (Others on request)
Historic Brand Amphenol Procom
Dimensions 170 x 154 x 33 mm /
6.69 x 6.06 x 1.30 in.
Weight Approx. 1.05 kg / 2.31 lb.
Ordering Codes
Model Product No. Frequency

DPF 4/6 S-3/4 N(f)

 200000282 3 – 4 MHz

DPF 4/6 S-4/13 N(f)

 200000263 4 – 13 MHz
Additional Information
Please Note

This filter type can also be delivered with the resonators stacked 3 over 3, thereby accomodating special space restrictions. In this case please order DPF 4/33 S.

Diagrams

TYPICAL RESPONSE CURVES

PROCOM A/S reserves the right to amend specifications without prior notice
PROCOM A/S • Smedetoften 12 DK 3600 Frederikssund • Denmark
Generated : 2026-06-27 Version 1