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DPF 8/6-4/8

6-Resonator Duplexer for the 8 m Band
Description
  • The DPF 8/6-4/8 is a 6-resonator duplex filter for duplex radiotelephones.
  • The 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 34 – 42 MHz band with a duplex separation between 4 and 8 MHz.
  • The filter has very small dimensions due 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.
  • DPF 8/6-4/8 is coated with black vinyl to prevent corrosion.
Specification
Electrical
Model DPF 8/6-4/8
Frequency 34 – 42 MHz
Max. Input Power 50 W
Special spec. info
Single-channel tuned :Multi-channel tuned
BW = 0.6 MHz :
Insertion Loss Tx-Ant and Ant-Rx
≤ 0.8 dB≤ 1.2 dB
Tx Noise Suppression on Rx Frequency
> 80 dB≥ 60 dB
Isolation Rx on Frequency Tx
> 80 dB> 60 dB
Impedance 50 Ω
Duplex Spacing 4 – 8 MHz
VSWR ≤ 1.5:1
Environmental
Frequency Stability Approx. 15 ppm / °C
Operating temperature range -30 °C to +60 °C
Mechanical
Connection(s) N(f) (Others on request)
Historic Brand Amphenol Procom
Dimensions 215 x 154 x 33 mm /
8.46 x 6.06 x 1.30 in.
Weight Approx. 0.9 kg / 1.98 lb.
Ordering Codes
Model Product No.
6-Resonator Duplexer for the 8 m Band 200000451
Additional Information
Typical Response Curves @ 4 MHz Duplex Spacing

DPF 8!6 4!8 Curve

Please Note

Duplex filters with other connector types or duplexers similar to the DPF 8/6-4/8, but with other Tx/Rx frequencies, can be quoted on request.

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