DPRH4-6-2M

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As we know, in order to get maximum repeater sensitivity with frequency spacing of 600 kHz, an isolation of about 90dB between receiver and transmitter is needed.

Receiver should be protected from the influence of both high-power carrier and transmitter noise. To accomplish the first statement the receiver circuit is equipped with filters. Noise reduction filters are installed directly into the main source of the noise – transmitter. These filters may be interconnected. This assembly is known as duplexer. The duplexer allows receiver and transmitter to share simultaneously one common antenna.

Operating frequency band (144-146 MHz) is enabled by quarter-wavelength (λ/4) square-shaped coaxial resonators with side of 4″ (100 mm). There are 6 such filters. Main resonator is made of copper. The resonator is firmly screwed to upper cover to eliminate energy loss. Case of the resonator is made of aluminum and by extrusion molding. Frequency adjustment is enabled with specifically designed capacitor. Its knob is located at the side panel of the resonator. After making adjustments the capacitor is locked with a nut. As you can see, this resonator has no thermal compensating screw made of Invar®, as distinguished from DPRE and DPR professional duplexers. But it makes no difference if a duplexer is located in a heated space. A thermal drift of +/-15 degrees does not affect the operation of the resonator. Therefore, such solution helps to reduce the duplexer production costs.

30 dB signal rejection in each resonator is achieved by a coupling loop and cable capacitor. We have eliminated traditional movable coupling loops with variable interaction factor due to amateur repeaters having 600 kHz constant fixed frequency spacing. Such design allows reducing cost and provides all required electrical characteristics. Filters are interconnected by Habia's semi-rigid 0.141″ cable with fluoroplastic insulation. Cables are soldered directly without connectors. Thus, we gain savings in both cost and power energy.

Also read:Technique of fine tuning of duplexer DPRE4-6VL which has been adjusted at a factory, but undergone out of adjustment.(PDF)

Electrical specifications Model DPRH4-6-2M Operating frequency band, MHz 144-148 Insertion loss (adjustable) not more, dB 1.7 Frequency separation TX/RX (min), kHz 600 Impedance, Ohm 50 Isolation, not less, dB 90 VSWR, not more than 1.5 Input power, not more, W 100 Temperature range, °C from +5 to +35 Cavity electrical length 1/4λ

Mechanical specifications Model DPRH4-6-2M Diameter, mm (ins.) 105x105 (4") Weight, kg 24 Connector N-female Mount to 19-inch rack present Length/Width/Depth, mm 700x480x215 Typical duplexers response curves. DPRH4-6-2M