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Overview and TD-90 modes of operation 6
Overview and TD-90 modes of operation
The TD-90 has three modes of operation identified as Mode 1, Mode 2, and Mode 3. All three modes
provide automated alignment and require different levels of configuration. The TD-90 software is
designed to default to Mode 3 if mode 1 is not defined and use mode 2 if GPS targeting data is available. A
high-level description is provided below followed by a step by step walk through of each mode.
Mode 3 (Default): Sweep to acquire, followed by Scan Align, followed by step peak to optimize. This
acquisition is done with no aid from GPS or Compass inputs.
Mode 2 (If GPS is available): Sweep to acquire, followed by Master/Slave sharing of GPS location (over the
link), and followed by on board compass point based on GPS location, followed by Scan Align, followed by
step peak to optimize. This mode uses on board GPS and compass to aid and tries to reduce Scan Align
time.
Mode 1 (requires additional user input): Mode one allows for user input of target latitude, longitude, and
altitude. If the user knows exactly where the two end points are located they may be entered and stored in
the system. The TD-90 will then start up and read its onboard GPS for its current location and use the
stored target latitude, longitude, and altitude to point. Once the initial pointing is done the system will still
go through a narrower scan align and final step peak process to optimize. This mode uses the pre-
determined target to remove the Sweep to acquire and minimize Scan align time.
Mode 3 operation (Default)
The TD-90 on power up will wait for a connection to a Cambium Radio. Once a connection is made
between the TD-90 and Cambium radio, the TD-90 will begin a 360° sweep to acquire. The TD-90 will
continue searching for another Cambium radio over the air. During the sweep to acquire process the
radios are in the highest transmit power and lowest modulation rate. This process to establish an initial link
can take between 2 to 15 minutes once both sides have been installed and powered up.
Once the radios establish any link and identify each other as the proper “Link Name” both TD-90
positioners immediately stop. The Cambium radios during configuration have been set to a “Master” and a
“Slave” assignment. Each TD-90 is determined to be either a master or a slave by reading the radio
attached locally to identify if it is the “Master” or “Slave” positioner.
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Master and Slave scan and peak assignments: The TD-90 connected to the Cambium radio which is
assigned to be the “Master” is in control of the link and assigns both positioners a time to scan align
and peak.
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Master 1 Scan Align: Full 360° scan with 5° steps and 5 second dwell time. The Master records signal
strength levels at all 72 steps and returns to the highest recorded level.
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Slave 1 Scan Align: Waits for Master command to move, Full 360° scan with 5° steps and 5 second
dwell time. The Slave records signal strength levels at all 72 steps and returns to the highest level
recorded. Reports scan complete back to master.
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Master 2 Scan Align: 180° scan with 5° steps and 5 second dwell time. Master records signal level at
each step returns to the highest recorded level.
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Slave 2 Scan Align: Waits for Master command to move, 180° scan with 5° steps and 5 second dwell
time. Slave records signal level at each step returns to the highest recorded level. Reports scan
complete back to master.
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Master 1 peak: Master 1 performs first step peak function.