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.
• The filter is black vinyl-coated to prevent corrosion.

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ORDERING DESIGNATIONS

TYPE NO.	PRODUCT NO.
DPF 8/6-4/8	200000450

SPECIFICATIONS

ELECTRICAL
MODEL	DPF 8/6-4/8
TX/RX FREQUENCY	34 - 42 MHz
MAX. INPUT POWER	50 W
INSERTION LOSS TX-ANT AND ANT-RX (at 4 MHz duplex spacing) Single-channel tuned Multi-channel tuned, 0.6 MHz BW	≤ 0.8 dB ≤ 1.2 dB
TX NOISE SUPPRESSION ON RX-FREQUENCY Single-channel tuned Multi-channel tuned, 0.6 MHz BW	> 80 dB ≥ 60 dB
RX ISOLATION ON TX-FREQUENCY Single-channel tuned Multi-channel tuned, 0.6 MHz BW	> 80 dB > 60 dB
DUPLEX SPACING	4 - 8 MHz
IMPEDANCE	Nom. 50 Ω
SWR	≤ 1.5
MECHANICAL
TEMP. RANGE	–30° C → +60° C
FREQ. STABILITY	Approx. 15 ppm/° C
CONNECTORS	BNC-female
DIMENSIONS (L x W x H)	215 x 154 x 33 mm
WEIGHT	Approx 900 g

Typical response curves @ 4 MHz duplex spacing

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.

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