User's Manual

20 68P80801E35-A 9/1/2001
Troubleshooting EBTS System Manual - Vol 2
Generation 2 Single Channel BR Station Verification Procedures
2.4 Connect the Power Meter to the female end of the 30dB pad
extruding from the Power input.
2.5 Press the “Zero” button on the 437B.
2.6 Wait for Zeroing operation to complete.
2.7 Press “Shift-Zero” to enter the Cal value. This is listed as CF on
the Power Sensor.
2.8 Wait for Cal operation to complete.
2.9 Press “Shift-Freq” to enter the Cal Factor. This is listed as Cf in a
chart vs. freq on the Power Sensor. Choose the closest frequency
range for the application. For 800MHz measurements, interpolate
between 1.0GHz and 0.5GHz to obtain a Cf of 99.0
2.10 For measurement of iDEN or Tornado 6:1 waveforms, press
“Offset” and enter 7.78dB.
3. Disconnect Cable A (see Figure 7 on page -60) from the Base Radio and
connect it to the Power Sensor Head.
4. Increase the power level on the R2660 until the HP 437B Power Meter reads
-50dB.
5. Record the DISPLAYED power level of the R2660 as Calfactor A.
6. The path loss through the cable and splitter system is Calfactor A + 50.
Example: R2660 reads -44dBm
HP 437B reads -50dBm
Calfactor A = -44, path loss = 6dB
7. Path loss must be determined for each Antenna cable A,B,C (see Figure 7 on
page -60). If comparable cables are used for all three the path losses of all
three should be the same.
8. Additional power will be added to the R2660 in the sensitivity measurement
to balance out the additional path loss value.
9. Reconnect cables A,B,C (see Figure 7 on page -60) to Antenna Ports 1,2,3.
10. Set the R2660 to Frequency 810MHz and a Power level of -113.5dBm + path
loss.
Example: If your path loss was 6dB, set the R2660
to-107.5dBm.