DT-QAM-AMM-1 Manual
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3.2 Starting
1. Once powered on, the DT-QAM-AMM-1 takes about 15 seconds to become operational.
You will then see the message “Initial Wait” appear on the display. After 30 seconds the
message “CH 2 & RF 00 ” will show on the display.
2. Connect an Ethernet cable directly to the Web Management Port on the front panel of the
digital modulator.
3. Using the Web application allows management of the device remotely via a
network connection.
3.3 Menu
1. Modulator:
Allows users to select either QAM or ATSC output
2. Constellation
type used to transmit signal (256QAM, 64QAM)
3. RF Level Adj:
Attenuates the power level of the output signal, in dB, from 0 to -30 dB.
4. Frequency:
Sets the frequency value of the output signal. Important: Check that the select-
ed frequency is not already being used by a current television distribution channel.
5.
Video Profile Settings:
The unit comes with a default setting called NORMAL, which pro-
vides generally accepted settings for the video profile. If you wish to customize these set
-
tings according to your preferences, you can switch to the USER DEFINE mode by clicking
on the radio button next to USER DEFINED. 4.1 Min & Max Bitrate: Changes the output
video bitrate. Allowed value is 2000 - 20000.
5.2
Latency:
Allows users to change the PCR delay time of video.
Allowed value is 0-1000.
5.3 GOP
: This function Changes the Group of Pictures (GOP) value. The setting will
specify the order in which intra- and inter-frames are arranged. If the video being
processed does not have a lot of motion, this value should be set to a larger
number. For fast motion video, the GOP should be set to a smaller number.
However, if the GOP is set too small, the video may jitter. If the GOP is too
large the video becomes smoother but may be blurred. The value can be set
between 1 - 60
5.4 Min & Max Quant: Changes the video detail. The lower the Quant value, the more
detail the picture has, but higher relative encoded data rate. If Quant is too small
the video may become jumpy. If Quant is too large the video becomes much
smoother but may be a little blurred. Allowed value is 1 - 31.
• To improve video quality, you can reduce Min Quant and increase the Max Bitrate.
• To make video smoother, you can increase Max Quant and GOP and reduce the Max Bitrate.
