AS
Mxxxx Series User’s Manual
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86
Modulation:
Selects the modulation type to be measured.
Note:
The channel measurement bandwidth is also selected in this field. Some modulation
selections default the channel measurement bandwidth (i.e. “TETRA” defaults to a 25KHz
setting), but if multiple selections are available, then this is easily identified by the
modulation label (i.e. “FM12.5” is 12.5KHz, and “FM25” is 25KHz).
Threshold Pwr:
The minimum forward power level for which channel measurements and alarm status will be updated. If the detected power
level is below this value the signal will be considered as not present and a new measurement not performed.
Note:
The default value for this field is “35dBm” which caters for most applications.
Alternate values to suit special applications should be entered against specific channels as required, but a value of
+10dBm (or higher) is recommended.
Add Row:
When the configuration page is loaded, only configured channels are displayed. To configure a new channel, click the Add Row
button to display the next available un-configured channel. Up to 20 channels may be configured for each Tx port.
Note:
If more than 20 channels are required to be configured as sampled by one Antenna Line Coupler (ALC), enter the
additional channels into Tx Port 2 (and/or Tx Port 3 and/or Tx Port 4) channel list(s).
In the
Calibration
– Tx Ports
pages, enter the same Forward and
Reverse Coupling values into the respective ports’
calibration pages as has been calibrated on the
Calibration - Tx Port 1
page.
For example, 37 channels could be monitored in one Tx combiner, via one ALC, by entering the first 20 frequencies
against Tx Port 1, and the remaining 17 frequencies against Tx Port 2. The Forward and Reverse Coupling values
determined in the
Calibration - Tx Port 1
page should be copied and applied to the
Calibration - Tx Port 2
page.
Remove Selected Rows:
Clicking this button will return the selected rows to their default settings and remove them from the display. Rows are selected
by clicking the checkbox at the left of the row. Clicking the checkbox in the title bar will select all the rows. Note that the first row
is always displayed.
Note:
For any text field, the allowable limits for that field (Model dependent) are displayed when the cursor is hovered over it.
Defaults:
Clicking this button reduces the display to only the first channel and enters the factory default values for the Channel
configuration settings. To only restore specific channels to defaults, select them, and then use the
Remove Selected Rows
button followed by the Add Row
button. The default settings are;
Channel ID
"Not Defined"
ON
Not selected
Frequency
OFF
BW
25 kHz
Threshold Pwr
35 dBm
Discard Changes:
Click this button to restore the values to those present when the page was last re-displayed.
Note that if invalid values are being displayed after an Apply attempt, these values may not match the current system
configuration. In this case, just select the relevant Configuration/Channels/Tx Port menu item again to re-display the current
configuration.
Apply:
This will attempt to save and activate the values entered. If any out-of-range values are present, nothing will be saved and the
problem settings will be highlighted with a red background.
Note:
Whenever programming changes are applied, the alarm status for affected channels is re-initialized.
