User Manual

SGD-SB2025NT-TUM, Part 1
Jan 12 Page 43 ALIGNMENT & TESTING
9.3. Press ‘5’ to zero the DC offset followed by ‘S’ to save the new settings.
10. On the MxTools main window, on the tool bar, select the Remote icon. The Remote page
will be displayed.
11. On the MxTools Remote page, select the ‘Software PTT’ button. A message will be
displayed warning that the radio will be keyed up for 2 minutes.
12. On the warning message, select the ‘OK’ button. The radio should transmit on the selected
channel.
13. On the RTS, ensure that the received carrier signal from the base station is as specified on
the radio base. Ensure that the ‘Tx Offset’ is less than 1 – 2 Hz, if necessary carry out the
following:
13.1. On the PC, using the HyperTerminal, use the < or > keys on the keyboard to adjust the
Tx Offset to zero.
13.2. When the Tx Offset is set to zero, press ‘S’ to save the settings.
14. On the TM ET, carry out the following:
14.1. On the Channel Status panel of the channel in use, select the ‘Setup’ button to access
the Channel Setup page.
14.2. On the Channel Setup page, on the ‘P25’ tab, using the drop-down list, set the Audio
Mode to Analogue and either 12.5 kHz or 25 kHz to match the SB2025 channel
bandwidth.
15. On the NI ET, carry out the following:
15.1. On the main window, select the ‘Eng’ button to access the ‘NI Engineering’ window.
15.2. On the NI Engineering window, select the ‘Main Audio’ tab,
15.3. On the Main Audio tab, ensure that the Audio Mode is set to ‘Remote’. If necessary,
use the drop-down list to change the audio mode (see Figure 6 below).
Figure 6. NI ET – Audio Mode to ‘Remote’.
16. Using the Analogue RTS, inject a signal at the appropriate Rx frequency, modulated at 100%
FM deviation at 1011 Hz at a level of -80 dBm into the Rx antenna socket of the SB2025.
Check that there is no CTCSS tone on this signal.
17. On the NI ET, on the Main Audio tab of the NI Engineering window, adjust the ‘In Audio
Sensitivity’ controls for an indication of 10,000 with the blue bar close to the middle of the
green section (see Figure 7 overleaf). Approximate settings are: the coarse control to 0 dB
and the fine control to around 112. (Expect small variations between receivers).
Note.
If the SB2025 is configured to use CTCSS, it will be necessary to temporarily change
Isolated Input #1 to ‘Monitor’ mode on the Signalling tab to make this adjustment.
Once the adjustment has been made, change it back to Auto mode immediately
afterwards.