Operating instructions

LOCAL OPERATION
3-80 46882-311D
• On sequence 12345 to respond to, and display, the first incoming POCSAG format
message which contains the numeric sequence ’12345’.
Press the [Clear Sequ] key to remove any data from the decode register and to re-arm the decode
function.
The next message received, if it conforms to the set decode format, will be decoded and the
message displayed.
The following parameters of the signal are decoded and shown on the display:-
Bit Rate: The bit rate of the received signal.
Polarity: Normal or inverted coding.
RIC: The Radio Identification Code
of the addressed pager.
Addr/Alert
Type:
Shows the format of the alerting
signal.
Message
Type:
Numeric or Alpha-numeric.
If a message is included in the transmission, this is shown in the message panel. Messages of up
to 120 characters can be shown.
The decoder detects the codewords of messages with errors and applies error correction. The
number of error codewords received in the message and the number of corrections made is shown.
Oscilloscope
The digital oscilloscope option is available from within the Tx TEST, Rx TEST and AF TEST
modes. There are two display functions:
The standard display with a viewing area of approximately 38 × 70 mm.
The expanded display with a viewing area of approximately 63 × 96 mm.
The oscilloscope display may or may not be shown when the Tx TEST, Rx TEST or AF TEST
modes are selected. This is dependent on the last use of the selected test mode
, and the selection
made using the [Power Up From] key on
setup page 2.
To access the oscilloscope function from a bar chart display, press the [scope/bar] key: the first
press will show the standard display, the second press will show the expanded display, the third
press will return to the bar chart display.
Setting up
The Y sensitivity and the timebase ranges of the oscilloscope are set from the right hand soft
keys. The current settings are shown above the oscilloscope display.
When in Rx TEST and AF TEST modes, the Y (vertical) input is by the AF input connector . The
Y sensitivity is switchable in a 1, 2, 5 sequence, from 10 mV/division to 20 V/division. The
[AC/DC] key selects AC or DC coupling into the oscilloscope.
When in Tx TEST mode, the Y input is taken directly from the modulation meter output. The Y
axis is calibrated to display modulation level. FM ranges are from 0.5 kHz/division to
25 kHz/division. AM ranges are 5%/division, 10%/division and 20%/division.
The horizontal timebase has ranges of 100 µs/division to 5 s/division in a 1, 2, 5 sequence.