140-174 MHz Narrowband duplexers DPF8-4V, DPF8-6V

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DPF8-4V

DPF8-6V

Electrical specifications

Model	DPF8-4V	DPF8-6V
Operating Frequency band, MHz	140-174
Insertion loss (adjustable) not more, dB	1,5	2
Frequency separation TX/RX (min), MHz	3,5	1,5
Impedance, Ohm	50
Isolation, not less, dB	55	63
VSWR, not more than	1,5
Input power, not more, W	not more than 300
Temperature Range with garanted stabilization, °C	from -30 to +60
Cavity electrical length	1/4 λ

Mechanical specifications

Model	DPF8-4V	DPF8-6V
Diameter, mm (ins.)	206 (8")
Weight, kg	14	21,3
Connector	N-female
Mount to 19-inch rack	yes	yes
Length/Width/Depth, mm	800x480x420	800x650x420

8-inch cavities with higher Q-factor are used when duplexer, assembled on 5-inch cavities, unable to provide appropriate isolation because of low frequency separation TX/RX. Increase in the number of cavities (in duplexer DPF8-6V case) leads to gain slope increase and to decrease of receiver desensitization.

Typical duplexers response curves

DPF8-4V

DPF8-6V