Rack-Mount RDMS
TM
Telemetry Receiver
96
Quasonix, Inc.
The Muting Timeout option is used to set a timeout value (in milliseconds). This setting is used to determine when
to mute (stop sending data) when the Muting Enabled option is set to On (checked). The valid range is 0 to 46016
milliseconds.
4.2.3.1.2.7 Synchronize Bit Rate Settings Window
The Synchronize Bit Rate Settings window, located below the Muting Settings window, is shown in Figure 170. It
consists of a Set Measured Bit Rate screen button and a Measured Bit Rate field.
Synchronize Bit Rate Settings sets the receiver’s commanded bit rate to the value it is currently measuring on the
input signal. The purpose of this process is to eliminate unintended bit rate offset error so that the receiver can make
full use of its bit synchronizer tracking range, or optionally reduce its tracking range. For the receiver to have an
accurate measurement, however, the input signal must be close enough to the previously commanded bit rate to be
within the current bit synchronizer lock range and actually be locked.
Click on the Set Measured Bit Rate screen button to display an optimum number in the Measured Bit Rate field. A
signal lock must be present for the measured bit rate to be valid. You may also type a number into the Measured Bit
Rate field. Allowable value ranges vary depending on the waveform mode in use. (You must click on the Apply
Settings screen button for the Measured Bit Rate setting to be accepted.)
Figure 170: Synchronize Bit Rate Settings Window
4.2.3.1.2.8 Video Settings Window
The Video Settings window, shown in Figure 171, provides controls over the analog (Video A/Video B) outputs
when the receiver is being used as an analog receiver.
The Video Scale option sets the peak-to-peak amplitude on the video outputs. By default the video output is 1 V
peak-to-peak using a standard deviated NTSC video signal. This setting allows the user to compensate for a system
where this is not the case.
The Video Filter option, available in PCM/FM mode, sets the system bandwidth for the analog signal. Nominally,
NTSC color video is approximately 6 MHz in bandwidth and black and white is 4 MHz. This setting allows the user
to control the cutoff of the video band pass.
Note:
Operating the receiver in analog mode is mutually exclusive with operating it as a digital receiver. The bit rate
for the digital receiver and the video filter cannot be set independently of one another.
In Tier 0 (PCM/FM), the “Q” channel output of the RDMS delivers the demodulated FM output. Enabling the Video
Signal Invert option (box checked) inverts the FM output.