User Manual

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Document #7201-002, Rev C Page 22
Sequence:
A sequence is defined as successive scans on one or several antennas.
Example: 2 antennas are connected (enabled and scan enabled)
“Scan” command is sent to the i-PORT
Scan is executed on Antenna 1 (Tx), Antennas 1 and 2 receive (Rx)
Scan is executed on Antenna 2 (Tx), Antennas 1 and 2 receive (Rx)
Results of the scan command / sequence are sent back
Calculation examples for “Cable Loss” field:
Coaxial cable RG58 has a loss of approximately 0.6dB/m (at 900 MHz). LMR-400 has a loss
of approximately 0.13dB/m. Loss across an SMA connector is approximately 0.2dB. Loss
across an N-to-SMA adapter (required to connect LMR-400 to the i-PORT) is 0.4dB.
1) 5dB gain antenna, 3-meter “pigtail” RG58 cable: –(Antenna Gain – Cable Loss - SMA
Connector Loss) = –(5dB – 3m x 0.6 dB/m – 0.2 dB) = –3.0 dB
2) 5dB gain antenna with N-connector on the antenna, 100-meter LMR-400 cable plus 2 -
meter RG58 adapter cable: –(Antenna Gain – N-connector Loss – LMR-400 Cable Loss –
N/SMA Adapter Loss – RG58 Cable Loss – SMA Connector Loss) = –(5dB – 0.2dB - 100m x
0.13dB/m – 0.4dB – 2 x 0.6dB/m – 0.2dB) = +10.0 dB