1.609 SatService-LBRX-1MT

This page describes the device driver and the device window for the sat-nms LBRX-1MT beacon receiver. This version of the beacon receiver is specialized for a high measurement rate, leaving out the frequency-tracking and c/n measurement modes of the standard sat-nms beacon receiver.

The LBRX-1MT does not provide a TCP/IP interface, if gets controlled via RS232 (Miteq-MOD95 protocol). The device driver for the LBRX-1MT has been designed to take advantage of the high measurement rate of the device. The 'power' device driver variable is defines with a 1 msec update rate, making the real update cycle solely dependent on the 'IDLE' time setting defined to the receiver's interface in the VLC device setup.

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 first parameter page displays the receive level and lets you set the basic receive parameters like frequency, bandwidth and input attenuation.
• --- The faults page.
• --- The device info page.
• --- The maintenance page. The configuration parameters described below are set at this page.

Configuration parameters

At the maintenance page of the device window there are a couple of configuration parameters which must be set to make the software talk to the receiver.

• parameter --- description

• address --- The LBRX-1MT receiver uses the fixed device address 'A'.

• loBandLo --- Enter the LO frequency for the lower frequency band here (MHz), if you want to specify the receive frequency in terms of true RF receive frequency. Enter 0 if you want the receive frequency to be displayed as receiver input (L-band) frequency.

• hiBandLo --- Enter the LO frequency for the upper frequency band here (MHz), if you want to specify the receive frequency in terms of true RF receive frequency. Enter 0 if you want the receive frequency to be displayed as receiver input (L-band) frequency.

• bandEdge --- Enter the edge between the receive frequency bands here (MHz). The receiver applies the 'loBandLo' LO frequency if the receive frequency is below the edge, the 'hiBandLo' LO frequency if it is above. If the 22kHzTone parameter is set to AUTO, the 22 kHz ist set accordingly.

• lnbVolt --- This parameter controls the LNB supply voltage provided by the receiver at it's input connector. The following settings are available:

  • OFF --- The D/C voltage is completely switched off.
  • 14V --- The LNB supply voltage is 14V
  • 18V --- The LNB supply voltage is 18V
  • AUTO --- The LNB supply voltage is switched on, the voltage depends on the 'Polarization' parameter. The voltage is 14V for vertical polarization, 18V for horizontal polarization.

• 22kHzTone --- This parameter controls the presence of a 22 kHz tone on the LNB supply voltage. The following settings are available:

  • OFF --- The 22 kHz tone is switched OFF.
  • ON --- The 22 kHz tone is switched ON.
  • AUTO --- The receiver automatically enables the 22 kHz tone depending on the receive frequency set. The tone is switched OFF for frequencies below the band edge, switched ON for frequencies above the band edge. The band edge is set with the 'bandEdge' parameter above.

• vOutScale --- This parameter defines the slope of the receiver's voltage output in V/dB. The output voltage has a range of 0 .. 10 V. Setting this parameter to 0.25V/dB lets the analog output cover a dynamic range of 40 dB.

• vOutOffset --- This parameter defines, which input level gives 0V output.

Variables defined by this device driver