User's Manual

Analogue Paging
RFI-148 & RFI-900 High Output Power Paging Transmitters User Manual Page 53 of 134
is about to start. As calibration progresses, each green LED will light up again, in turn, until calibration
completes
5
.
On completion, the LED array reports success/failure, holding the result for three seconds:
• Success – the green LED progress indication is held
• Failure – the two red LEDs illuminate, while a single green LED is lit, its position within the array
indicating the reason, in accordance with Table 13.
Following calibration, the Tx Power LED array’s behaviour will return to normal.
LED
Position
Failure Cause
Remedial Action
1
Timeout
Repeat calibration
6
2
No reference was detected
Ensure a tone of supported amplitude is being
presented to the LIU pins in accordance with Table 12
3
Digital Paging mode is
selected
Pull LIU Pin 13 to 0V/GND
Table 13: Calibration failure error codes
Figure 19: LED Array reporting Digital Paging mode is selected during calibration attempt.
In addition to the front panel diagnostics, the PTX can be interrogated for calibration state information via AT
command (“ATM34”).
5
It may often be the case that calibration completes before the first LED lights. In this event, the “countdown” preparation phase
provides user confidence of calibration having occurred.
6
Rarely, the calibration will take longer than expected and timeout – repeating the process invariably succeeds.
TRANSMIT ON
FAULT
LOW POWER
HIGH VSWR
SERIAL/ETHERNET
POWER
25
250
125
TX POWER (W)