RC4500 Antenna Controller Chapter 5 MODES – In Depth Descriptions
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This screen defines how the signal strength inputs are used. See
5.2.1.2.5 External Sig Factors
Chapter 3 for references to the use of
signal strength inputs and section 4.3.2 for information regarding calibration.
LOCK:0 TIME:1.0 CONFIG-EXT
THRES: 10 SENSE:1
LOCK TYPE <0>NONE <1>HI <2>LO
LOCK: LOCK TYPE <0>NONE <1>HI <2>LO
When tracking signal source is set to EXT, this item defines whether a discrete signal lock input is
required to indicate a satellite has been found.
If a signal lock input is used, it may be defined as either having a HI (>3.5 VDC) or LO (< 0.8 VDC) level
that indicates lock.
TIME: LOCK TIME <0.0 – 10.0 SECONDS>
This item defines how long the RC4500 will wait after each step before sampling signal strength.
Increasing this value may be required to allow equipment such as a modem to generate an AGC output.
THRES: SCAN SLOW THRESHOLD <0-4000>
The threshold item defines what the minimum signal strength indication for the channel is required for the
tracking system to “recognize” that a satellite is present. NOTE: these items are only applicable to
TRACK mode.
If different bands are received that exhibit different “off satellite” signal strengths, the highest “off satellite”
value should be used to avoid the possibility of recognizing noise as a satellite.
SENSE: INPUT SENSE POLARITY <0>NEG <1>POS
The polarity flag tell the controller what the sense is on the signal strength input voltage used for tracking
operations. A positive sense is defined as one that increases in magnitude as the RF signal strength
increases. If the signal strength voltage decreases as the RF signal increases, its polarity is considered
negative.
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