The Band-Pol-4-To-1 logical device controls a 4-to-1 switch which typically selects a receiver input signal from two polarization panes and two frequency bands. The switch either may be part of the receiver or an external switch.
In a typical configuration the Band-Pol-4-To-1 device is placed between the Link device and the receiver. The Link device sets the receive polarization and frequency at the Band-Pol-4-To-1 device. The latter selects the proper input signal and forwards the frequency setting to the receiver.
Device window pages
The following table shows which device window pages are available with this individual device type. Tool-bar functions not mentioned here are described at the general description of device windows .
--- The main control page for the device. You may set the frequency and polarization manually at this page.
--- The device info page.
--- The maintenance page. The configuration parameters from this page are described below.Configuration parameters
At the maintenance page of the device window there are a couple of configuration parameters which must be set to interconnect the Frequency-Split device with the devices that will perform the frequency setting.
| parameter | description |
|---|---|
| frequencyId | Enter the message identifier here of the parameter which shall receive the frequency setting, e.g. "IRD-1.frequency". Look at the list of device driver variable definitions to see correct name of this setting at the device type you are using. |
| switchId | Enter the message identifier here of the parameter which shall receive the switch setting, e.g. "IRD-1.select". Look at the list of device driver variable definitions to see correct name of this setting at the device type you are using. |
| freqThresh | The frequency threshold which separates the "low" band from the "hi" band. With Ku Band receivers you usually will set this to 11.800 MHz. |
| lowVertPos | The switch position to be set to select the low band, vertical polarization signal. |
| lowHorPos | The switch position to be set to select the low band, horizontal polarization signal. |
| hiVertPos | The switch position to be set to select the high band, vertical polarization signal. |
| hiHorPos | The switch position to be set to select the high band, horizontal polarization signal. |
To use the Band-Pol-4-To-1 logical device as a polarization select control only, set the freqThreshold to the lowest possible value and use the high band switch positions.
Variables defined by this device driver
| name | type | flags | range |
|---|---|---|---|
| info.driver | TEXT | R/O | StringRange R/O |
| info.type | TEXT | R/O | StringRange R/O |
| info.frame | TEXT | R/O | StringRange R/O |
| config.frequencyId | TEXT | SAVE SETUP | StringRange |
| config.switchId | TEXT | SAVE SETUP | StringRange |
| config.freqThresh | FLOAT | SAVE SETUP | DoubleRange (0.000 .. 0.000) |
| config.lowVertPos | TEXT | SAVE SETUP | StringRange |
| config.hiVertPos | TEXT | SAVE SETUP | StringRange |
| config.lowHorPos | TEXT | SAVE SETUP | StringRange |
| config.hiHorPos | TEXT | SAVE SETUP | StringRange |
| position | TEXT | R/O | StringRange R/O |
| polarization | CHOICE | EnumRange (X Y) | |
| frequency | FLOAT | DoubleRange (0.000 .. 0.000) |