User Manual

ADCP-75-159 • Issue 1 • August 2003 • Section 4: Operation

Page 4-15

Figure 4-11. Remote Fwd Att Pop-Up Screen

6. Verify that the appropriate RF output signal level appears in the RF Pwr-VSWR Low

section (see Figure 4-10). This is primarily a reference value and should not take the place

of external test equipment when determining the power level of the composite RF output

signal. Depending on the modulation type and number of channels, the EMS software may

report a power level that is higher or lower than the actual RF output signal.

2.8 Enter Host Reverse Attenuation

The level of the RF signal that should be input to the EBTS will vary depending on the type of

EBTS, the receive distribution, and the number of channels present. To interface with the EBTS,

the reverse path signal level must be adjusted to provide the signal level required by the EBTS.

The HU provides from +10 dB of gain to +30 dB of gain in the reverse path. Use the following

procedure to set the reverse path gain:

1. Check the EBTS manufacturer’s specifications to determine the composite signal level

required at the EBTS reverse path input port.

2. Determine the overall gain and loss imposed on the signal by the antenna, antenna cable,

and by the cables that connect the HU to the EBTS.

3. Determine the amount of gain required to raise the reverse path signal to the level required

at the EBTS.

4. Click on the HOST RF tab. The HOST RF display will open within the EMS main

window as shown in Figure 4-12.

Note: To comply with Maximum Permissible Exposure (MPE) requirements, the

maximum composite output from the antenna cannot exceed 1000 Watts EIRP and the

antenna must be permanently installed in a fixed location that provides at least 6 meters

(20 feet) of separation from all persons.