Agilent Technologies E6385A manual 83C Fsw bsz e--x-wv P-sy, Base Station

Installation

Determining the Test Set to Site Equipment Connections

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Antenna

TX Antenna Port

Base Station

Linear

Amplifier

Directional

Coupler

TX Test Port

Coupling Factor is the loss through the directional coupler to the TX Test port.

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NOTE	If you are uncertain of the Specified Output Power for the transmitter at the Base
	Station m	, the Test Software must measure the power to calculate the
	coupling factor. This requires that you take the Base Station out of service to connect the
	Test Set directly to the Base Station TX Antenna Port during the calibration routine.
	One disadvantage to using the Base Station TX Test Port to make measurements is the
	possibility that its coupler is malfunctioning and therefore will cause erroneous
	measurements. If TX power measurements fail by a large amount, but you suspect the
	actual	power is correct, take the Base Station out of service and make

measurements directly at the Base Station TX Antenna Port to verify the failing reading. If the Test Software is correctly configured, TX power measurements using the Base Station TX Test Port and TX Antenna Port should not differ significantly.

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Disconnecting a TX antenna feed line and connecting the Test Set to the Base Station TX Antenna Port (see Figure 2-8) requires that you first take the Base Station out of service (disable call processing and turn off all transmissions to that TX Antenna Port).

The Base Station may be taken out of service (and turned back on to make measurements) in two ways:

1. Access the MSC using a PC and the BTS Laptop Utility program to control the Base Station through its maintenance software.

2. Call the MSC and have switch personnel control the Base Station for you.

One benefit of testing directly at the Base Station TX Antenna Port is the confidence that the measurement will reflect the true output power of the Base Station at the point at which the antenna feed line connects to the Base Station. This verifies the operation of the full transmission path inside the Base Station. It also provides an opportunity to perform transmission line and antenna testing while the antenna is disconnected from the Base Station.

Installation

Chapter 2 37