User Manual

SGD-SB2025NT-TUM, Part 2
Jan 12 Page 53 SOLAR COMMISSIONING
Figure 46. Test Tone Facility.
5.2.3.3.3 Route
The test tone may be sent to either the ‘External’ (the analogue output), ‘Network’ towards the TM
or both by setting that route to “ON”. It is the selection of the ‘Route’ that activates the test tone.
Selecting the ‘Network’ route at a Station NI will need to be accompanied by a valid RSSI level
(and mute open condition if so configured) for the test tone to pass through the TM and be output
from the Central NI. The tone will be re-broadcast if channel T/T is selected.
Selecting the ‘Network’ route will result in the ‘In Audio Sensitivity’ gauge displaying a level in
sympathy with the test tone level while the network is connected. When a ‘Route’ is selected the
indication on the front status page (see Section 2.2.1.2 ) will be present to warn the user that it is
active and that normal operation is suspended.
When a level change is applied the marker alongside the slider will turn Blue until the change is
confirmed whereupon the position of the marker will match that of the slider control pointer and turn
Grey again.
Note.
If a frequency of 0 Hz is entered and a ‘Route’ selection is made, no tone will be output
and the normal audio path in the ‘Route’ direction will be suspended.
5.2.3.4 CTCSS Tone
The CTCSS Tone Level is set to meet the required output using the coarse level (left slider) and
fine level (right slider) controls (see Figure 47 overleaf). The coarse gain steps are 3 dB and the
fine slider gives a 6 dB range of control. The current settings are shown by the marker to the right
of the slider and the value at the bottom.
When a level change is applied the marker alongside the slider will turn Blue until the change is
confirmed whereupon the position of the marker will match that of the slider control pointer and turn
Grey again.
Whilst the CTCSS Tone frequency can only be set centrally at the TM to ensure all sites within a
channel generate the same CTCSS frequency (see Section 5.4.3.2 ), the frequency setting is
reported here for convenience.