8611/SM SIGNAL MONITOR OPTION
APPENDIX A
A-9
A.9.3 DATA FORMAT
The WJ-9168 transfers panoramic signal strength information as a series of
binary data bytes. Each data byte represents the level of signal energy at one
point in the IF spectrum being swept by the unit. These binary data bytes are
transmitted in a block format. The particular data block transfer format is
selected by the Select Data Transmission Mode (AC
H
) command, which is
sent to the signal monitor module prior to the start of data transfer. This
command allows selection of any one of three data transfer modes: in 40-byte
blocks, in single full-sweep blocks, or as a continuous data stream broken into
full-sweep blocks. These block transfer formats are described below. Data
within the data blocks in any of the three modes is arranged in relationship to
the frequency spectrum being swept and is transmitted in the following
format:
Data Point Format:
1 byte/data point
Unipolar 8 bit binary, range 0-250
data represents LOG scale, at 0.286 dB per unit
Calibration points:
Data code 210
10
= -55 dBm input level
Data
code
70
10
= -95 dBm input level
Data Value (dBm) = -95 dBm + 0.286 (Input Level Code minus the Data
Code for -95 dBm)
Example: Input Level Code = 135
Data Value (dBm)= -95 + 0.286 (135 - 70)
= -95 + 18.6
= -76.4
MULTIPLE
BLOCKS/
MULTIPLE
SWEEP
DATA
TRANSFER
This type of data transfer is initiated when the Select Data Transmission Mode
(AC
H
) command is sent with the 00
H
argument (i.e., the default argument). In
this data transfer mode, the WJ-9168 begins the transfer of panoramic signal
strength information when the Start Processing command (A2
H
) is given. The
number of blocks transmitted is determined by the Sweep Span Select
command (A0
H
) and the Compression command (A1
H
) parameters.
Courtesy of http://BlackRadios.terryo.org
Summary of Contents for WJ-8611
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