Operations Manual

OPERATIONS 4-11
O&M of the MCC-545B PACKET DATA RADIO
12/2000
SUBST,relay_id,relay_group,remote_id,remote_group
where: relay_id is the relay unit's ID
relay_group is the data group report number at the relay
remote_id is the originating Remote unit's ID
remote_group is the data group report number at the originating Remote unit
4.2.10 Scaling A/D Readings
The 545B appropriately scales readings from its A/D converter for operator use. The readings
that require scaling are battery level, detected RF and transmit power. The scaling factors
required for these readings depend on the type of hardware configuration in the 545B and are set
by operator command using the SCALE command as summarized in Table 4.1.
There are four values that need to be scaled differently depending on the equipment
configuration:
! Battery Voltage (STAT/TEST commands)
! Detected RF in dB (MM command, meteor monitor, BINS command)
! Detected RF in microvolts (STAT/TEST commands)
! Transmit power level (STAT/TEST commands)
The required scaling factors are determined by the power supply used in the PACKET DATA
RADIO; however, the receiver type (RXTYPE command) is also significant since the 527 and
543 receiver calibration curves which relate detected RF (in dB) to microvolts are
nonlinear and significantly different.
To apply the scaling factors, the transmit power A/D reading value must first be squared then
then multiply by the factor in the table. For the other values, take the A/D reading directly
and multiply by the factor.
MCC-545B SCALING FACTORS
PARAMETER STANDARD
545B, 12V
EGYPT
543, 36V
NORWAY
545B, 28V
BAT
0.0623 0.05 0.1749
DETRF
0.0188 0.1074 0.0188
TXPWR
0.000353 0.00116 0.000353
RXTYPE
527 543 527
TABLE 4.1