Radio Mobile - RF propagation simulation software |
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MSI is the extension mostly used in combination with antenna radiation patterns in planet antenna format.
Planet is a RF propagation simulation tool initially developed by MSI. Planet was a 2G radio planning tool which has set a standard in the early days of computer aided radio network design. The antenna pattern file and the format which is currently known as ".msi" format or .msi-file has become a standard.
The antenna pattern file is an ASCII Text file and the general information, horizontal data points and vertical data points are stored in one file. The left column label and the data is separated by at least one space. The horizontal data and vertical data can be separated by at least one space or a Tab character.
There must be 360 data points (0 through 359) for the Horizontal data and 360 data points (0 through 359) for the Vertical data. Zero degrees represents North for the Horizontal pattern and Zero degrees represents the horizon for the Vertical pattern. The antenna gain unit is dBd. If the Gain is in dBi, it must be indicated after the Gain value (separated with at least one space). All gain datapoints are relative to maximum gain being zero. Any value below zero is assumed to be negative. Do not include the minus sign for these values.
The name of the antenna should be the first line of the file
antenna.msi |
NAME <name> MAKE <make> FREQUENCY <frequency> H_WIDTH <h_width> V_WIDTH <v_width> FRONT_TO_BACK <front_to_back> GAIN <gain> TILT <tilt> POLARIZATION <polarisation> COMMENT <comment> HORIZONTAL 360 0 <0H> . . 359 <359H> VERTICAL 360 0 <0V> . . 359 <359V> |
Variables:
Variable |
Comment |
NAME |
Name of the antenna |
MAKE |
Name of the manufacturer |
FREQUENCY |
Frequency in MHz |
H_WIDTH |
Opening angle in the horizontal plane between the -3 dB points |
V_WIDTH |
Opening angle in the vertical plane between the -3 dB points |
FRONT_TO_BACK |
Front to back ratio in dB |
GAIN |
Antenna gain in dBd when in dBi this must be specfified |
TILT |
Electrical tilt of the main beam in degrees |
POLARIZATION |
Horizontal, vertikal, +45 or -45 |
COMMENT |
Comment |
0H..359H |
Horizontal gain datapoints per horizontal angle relative to maximum gain being zero. Any value below zero is assumed to be negative. Minus sign is not used with these values |
0V..359V |
Horizontal gain datapoints per horizontal angle relative to maximum gain being zero. Any value below zero is assumed to be negative. Minus sign is not used with these values |
Sample file:
mapfile.inf |
NAME PCS19HA-11015-2** MAKE Andrew Corp FREQUENCY 1920 H_WIDTH 115.97 V_WIDTH 4.77 FRONT_TO_BACK 25.32 GAIN 14.50 dBd TILT Electrical POLARIZATION Vertical COMMENT PCS directional Antenna HORIZONTAL 360 0 0.000 1 0.096 2 0.096 3 0.096 4 0.096 . . . . 353 0.096 354 0.096 355 0.096 356 0.096 357 0.096 358 0.096 359 0.096 VERTICAL 360 0 1.401 1 0.300 2 0.000 3 0.400 4 1.895 5 4.096 6 8.201 7 10.006 . . . . 350 17.924 351 17.393 352 19.494 353 21.514 354 23.479 355 24.437 356 20.000 357 13.979 358 7.494 359 3.098 |
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cmsimple-styles.com template modified by PE1MEW |