The page 'Settings' contains the receiver's operational parameters. Operational parameters are those which are assumed to be changed more frequently than the installation parameters on the Setup page.
The page displays a table with the parameters actually set. Each parameter value is a hyper-link to a separate page which lets you change this parameter. This parameter change page shows the actual parameter setting either in an entry field or in a drop down box. You may change the parameter to the desired value and then click to the 'Submit' button to pass the changed value to the receiver. The receiver automatically returns to the settings page when the parameter has been changed. To cancel a parameter modification you already started, either use the 'Back' button of you web browser or click to the 'Settings' button on navigation bar. Both returns to the settings page without changing the parameter you edited.
The table below lists the settings provided by this page.
| Parameter Name | Description |
|---|---|
| RF receive frequency | This is the receiver's nominal receive frequency. Depending on the LO frequency settings made on the Setup page, the frequency value either is expressed as the RF receiver frequency or the L-band frequency at the receiver's input. If the '22 kHz Tone' setup parameter is configured as 'AUTO', changing the frequency also may switch the 22kHz modulation on the LNB power supply on or off. |
| Polarization | If on the Setup page the 'LNB voltage' parameter is set to 'AUTO', the receive polarization may be set with this parameter by changing the LNB Voltage. The polarization is set with the alias names defined at the Setup page unless these are at their default value (H/V). |
| Attenuation | The receiver provides a switchable input attenuator which lets you adjust the input level in 10 dB steps. This is specially useful with large Antennas pointing to a satellite which generate a high flux density. With the attenuator you may adjust the input level in order to avoid saturation effects in the receiver. All input attenuator steps are calibrated, the attenuation values are taken into account for the displayed receive level. Available attenuator settings are 0, 10, 20 and 30 dB. |
| Measurement Bandwidth | The receiver provides four different measurement bandwidth filters (6, 12, 30 and 100 kHz). The 30 kHz filter is suitable for majority of cases. |
| Post detector filter | The receiver's software applies a low pass filter to the measured level values. This is much like the video filter at a spectrum analyzer. Available bandwidth settings for this filter are 0.1 to 5 Hz in 1/2/5 steps. Lower bandwidth settings make the reading more stable, reduce the fluctuation. Please keep in mind, it will take a noticeable time until the level reading settles after an input level change with a very low bandwidth setting. |
| Spectrum Compensation | With this parameter set to 'OFF', the receiver's level reading is calibrated for a C/W signal. By selecting a modulation type for this parameter, the level display gets compensated for the selected modulation type. |
| Alarm Threshold | With this parameter you set the level threshold. If the measured level falls below this value, the receiver states a receive level fault. To disable the level alarm, set the threshold to a very low value, e.g. -120 dBm.Please note, that the threshold value refers to the signal level, even if the receiver operates in a C/N measurement mode. |
| Signal search enable | Setting this parameter to ON enables the automatic signal search function. With signal search enabled, the receiver searches the signal within the frequency tracking range when the signal ist lost. Chapter 5.5 Signal search describes this function more detailed. 'SEARCH NOW' starts a search scan immediately, regardles of the enable setting. |
| Signal search delay | This parameter defines the time, the receiver waits after the signal was lost until a search scan ist started. The valid range of this parameter is 0 .. 600 seconds. |
| Frequency Tracking | This parameter switches the the frequency tracking facility of the receiver ON or OFF. A description of the frequency tracking facility is given in chapter 5.4 Frequency Tracking. |
| Frequency Tracking Interval | This parameter sets the interval on which the frequency tracking procedure operates. The value is in seconds. Recommended settings are 15 seconds to tune the receiver quickly to a frequency you do not know precisely. For normal operation a frequency tracking interval of one hour (3600 secs) is recommended. |
| Frequency Tracking width | With this setting you limit the frequency offset the frequency tracking procedure may apply to the nominal frequency. The frequency tracking never tunes the receiver to a frequency outside the nominal frequency +/- this value, a frequency track fault is generated if the tracked frequency reaches the limit. |
| C/N Noise measurement | With this parameter you select if the receiver shall perform a plain input level measurement or a C/N measurement. A description of the C/N measurement function of the receiver is given in chapter 5.3 C/N Measurement . You may select one of the following measurement modes: OFF --- The receiver performs a plain level measurement. The Readings page shows the input level in dBm. C/N --- The receiver measures the signal / noise ratio. The Readings page shows the C/N in dB. C/N0 --- Like the C/N mode, but the receiver normalizes the C/N value to 1 Hz measurement bandwidth. The Readings page shows the C/N0 in dBHz. |
| Noise Measurement Frequency | With this parameter you specify the frequency at which the receiver shall measure the noise level at a certain interval. Like with the receive frequency, the LO frequency settings made at the Setup page are taken into account also for this frequency value.To get reasonable results with a C/N measurement, you should consider the following: 1 --- The receiver does not change the LNB frequency band setting when it switches from the level measurement to the noise measurement. The LNB probably would change it's gain in this case. The noise measurement frequency hence must be in the same frequency band as the receive frequency. 2 --- Measuring the noise level at the band edge may falsify the result due to the LNB's band filter. The measured noise level may be too low in this case. 3 --- You should verify with a spectrum analyzer, that no signal disturbs the noise measurement at the selected frequency. |
| Noise Measurement Interval | This parameter defines the interval at which the receiver inserts noise measurements in the C/N modes. The time is specified in seconds. 3600 secs being one hour is a suitable setting in most cases. |