88 Appendix C Testing with the TBA0STU Calibration Test Unit TB7300 Installation and Operation Manual
© Tait International Limited December 2022
Checking Audio Output
1. Put the base station online.
2. Connect a load to the transmitter and put the base station in online
mode.
3. Connect an on-channel RF signal of -80dBm with a 1kHz tone set to
60% of system deviation.
4. Switch the speaker audio selection to Balanced and, advancing the
volume control, you should hear the 1kHz tone.
5. The configured and measured output levels are indicated on the
WebUI in the Audio output section. Audio output is available from
the Line Output BNC connector. If the load connected to this output
is high impedance, the CTU 600 Ohm load can be switched to On to
terminate the balanced line for accurate level measurement.
Checking Audio Out
1. Put the base station offline.
2. The reciter can generate a tone to the analog line output in the Audio
out section.
3. Set the frequency and level required and click Start to generate the
tone. This should be heard in the CTU speaker with the switch
f set
to Balanced.
Loopback Test
1. Put the base station offline.
2. Connect the audio generator set to -10dBm @ 1kHz (this is the
factory default line level) to the Line Input BNC connector of the
CTU
e.
3. Connect an audio level meter to the Line Output BNC connector of
the CTU
i.
4. Start the Loopback test. Audio will be looped within the reciter from
the audio generator to the audio level meter.
Checking Digital IO
On the WebUI, monitor the operation of digital IO at Monitor > Interfaces
> IO tab.
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