DIGIMINI AMERICAS REPEATERS
PRODUCT DESCRIPTION AND USER’S MANUAL
Cobham Wireless
–
Coverage
Date: 6-Jul-17
www.cobham.com/wireless
Document number: 00031UM
Rev. 6.3
Page |
5-11
For example, if the DL Output Threshold value is set to 8dB, when the
Measured Composite DL output
power is 8dB less than the
set Composite Output Power, an alarm is generated.
•
Meas. Composite DL Output Power – displays the currently measured output signal level.
4. To configure each sub-band:
•
Checkmark Enable. The configuration parameters in that row will be available.
•
In the Downlink area, set the Start and Stop DL Frequency (MHz). (The Uplink Start and Stop
frequencies will be automatically allocated.)
NOTE: For tables of GSM frequencies Vs channels, refer to Appendix B (GSM 900 MHz) and
Appendix C (GSM 1800 MHz).
The defined BW will be displayed in the BW KHz column (to the left of the Start Frequency).
•
Set the (Downlink) Max Gain as follows: by default, the MAX Gain (DL) parameter is set to its
highest level (73dB). Change the Channel Max Gain (DL) according to the measured/calculated
input power and isolation measurements.
•
The recommended Maximum Gain setting is approximately 15 dB less than the isolation between the
service and donor antennas.
5. If the site NOISE LEVEL is high enough to cause interference, adjust the noise level as follows:
•
Adjust the Gain Delta parameter – this sets the delta between the uplink and downlink gain (so the
uplink gain is relatively lower than the downlink gain.
•
Click Send.
•
Repeat the procedure until the desired coverage is achieved.
6. More information on parameters for the
selected sub-band:
•
DL Set Ch. Max. Gain Sets the power for the antennas. The value is about 15 dB less than the
isolation between the donor antenna and the mobile antenna.
•
The Value defined in the DL path is reflected in the UL path, however to define different UL
and DL path values the Gain Delta parameter is used and its defined value is added to the UL
value.
•
DL Measured RSSI - measured DL signal.
•
DL Measured Ch. Gain - measured DL Gain (dB) for the selected sub-band.
•
DL Measured Ch. Power - measured Power (dBm) for the selected sub-band.
•
UL Gain Δ - used for noise control. Sets the difference between UL and DL gain.
•
UL Measured Ch. Gain - measured UL Gain (dB) for the selected sub-band.
7. Click Send (top window area option).
