User Manual

SGD-SB2025NT-TUM, Part 2
Jan 12 Page 47 SOLAR COMMISSIONING
1. Apply a signal level to the Rx of minimum RSSI, typically a mute threshold level.
2. Subtract 10 (see note) from the ‘Signalling Status’ measured value of voltage and enter this
into the minimum Boundary box.
Note.
The subtract figure above is a suggested value to help ensure that the NI does not cut
off low level signals when the receiver squelch may still be open (squelch hysteresis).
3. Apply a signal of maximum RSSI.
4. Enter the ‘Signalling Status’ measured value of voltage into the maximum Boundary box.
Figure 40. Signalling In Configurations.
5.2.2.1.2 Signalling Status
The report of the incoming signal is displayed in this area. Also shown is the ‘Hang’ time in
seconds. This is the time that the transmitters will remain keyed after the channel PTT instruction
has been removed as defined in the TM channel configuration – see Section 5.4.3.1 .
5.2.2.2 Signalling Out
This facilitates the use of a signalling tone output. The signalling tone is enabled by setting a valid
frequency (0 Hz = Off). When enabled, the tone is switched on:
• for Station NI mode when Tx PTT is active;
• for Central NI mode when a voted signal is present.
Both level and frequency can be set as required (see Figure 41 overleaf).
Input Type
Maximum
Minimum
Measured Value