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JRC NTG337-EL0 Instruction Manual: Connecting A Cable Between Ap-rfu And Ap-ifu

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5.4. Connecting a Cable between AP-RFU and AP-IFU

5.4.1. AP-RFU (Omni Antenna)
Step1 Use the coaxial cable to connect the AP-RFU and the AP-IFU. (Figure 5-17)
Step2 Waterproof the connection with self-bonding tape or cold-shrinkable tube.
Figure 5-17 Connecting the Cable to the AP-RFU (Omni Antenna)
・ +16VDC to be supplied to the AP-RFU is superimposed on the signals in the IF cable.
Turn off the power to the AP-IFU when installing or removing the IF cable. Otherwise, the
unit may be damaged.
・ Cover the cable connection with a cold-shrinkable sleeve to make it waterproof.
Otherwise, water may get in the connection.
・ The curvature radius of the connection cable between the RFU and IFU should be 6 times
or more the outer diameter of the cable.
・ When securing the connection cable between the RFU and IFU, be careful so the cable is
not deformed.
Selfe Bonding tape and PVC tape
Connected cable between IFU and RFU
Cable type
Maximum length
Connector Shape
Coaxial cable with an N Type Plug
connector (IF cable)
Characteristic impedance : 50+2Ω
Attenuation(247.5MHz) : 0.135dB/m or less
Conductor resistance :
1.572Ω/loop・100m or less
N Type plug for coaxial


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