8611/SM SIGNAL MONITOR OPTION
A-10
APPENDIX A
Once the Start Processing command (A2
H
) is given, the WJ-9168 begins the
transfer of panoramic Signal Strength information. This data is transmitted in
a block format as described in the following:
Block Format:
Variable block size; FULL or PARTIAL
FULL block size = 41 bytes
Block prefix = number of data points in block
40 (28
H
) = full 40 point block
1-39 = number of points in partial block
There is always an integer number of blocks for a single frequency sweep.
Every block, except possibly the final block of the sweep, is a FULL block
with its prefix equal to 40. The last block in the sweep may be a PARTIAL
block, containing enough data points to complete the sweep; its prefix is equal
to the number of points in the block. The next sweep starts fresh with a new
FULL block.
Examples:
Span #06
H
; 160 points/sweep = four blocks/sweep; all blocks =
FULL.
Span #02
H
; 200 points/sweep = five blocks/sweep; all blocks =
FULL.
Span
#
0D
H
; 100 points/sweep = three blocks/sweep;
two blocks = FULL; third block = 20 points.
The Compression command (Al
H
) reduces the number of data points
transmitted in a sweep. The command allows a reduction of data points by a
factor of either 2 or 4, but the sweep data is still transmitted in the standard
block format. In the following examples, the compression factor is 2 (one-half
the number of points).
Example: Span
#06
H
; 80 points/sweep actually sent; two
blocks/sweep; all blocks = FULL.
Span #02
H
; 100 points/sweep actually sent; three
blocks/sweep; two blocks = FULL; third block = 20
points.
The sweep does not include both end points of the IF spectrum. For example,
a sweep span parameter of 00
H
indicates a 10 MHz span with a 25 kHz step
size. The 400 point sweep is actually from 16.400 MHz to 26.375 MHz
inclusive (26.4 MHz - 25 kHz = 26.375 MHz).
SINGLE
BLOCK/SINGLE
SWEEP DATA TRANSFER
This type of data transfer is set up when the Select Data Transmission Mode
(AC
H
) command is sent with the 01
H
argument. In this data transfer mode, the
WJ-9168 begins the transfer of panoramic signal strength information when a
Start Processing command (A2
H
) is sent. The data is transmitted in one
variable length block. Another data block is not transmitted until a Send Next
Data Block command (A4
H
) is sent. The length of this block for a given
Courtesy of http://BlackRadios.terryo.org
Summary of Contents for WJ-8611
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