Installation
Determining the Test Set to Site Equipment Connections
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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
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.
36 | Chapter 2 |
O:\Manuals\E6385A_Amps\Book\install.fm
