Blonder tongue AMM-806, Reference Manual

Page: 40 / 285

33
AQT - ATSC to QAM Transcoder
Each of the modules are displayed in order by scrolling through
the sequence to find the desired variable on a respective installed
module. Modules not installed are listed by the "MODULE IS NOT
PRESENT" message. The SNR value for each module is displayed
together for each of the installed eight modules at the end of the
sequence.
• SNR is displayed when an AQT module locks to an input program
channel and indicates the signal to noise ratio of the input signal
and is expressed in dB. The following are the desired input SNR
ranges for the appropriate signal modulation type:
Programming a Variable
1. Use the t (L) or u (R) arrow navigation keys to scroll to the
installed module you desire to adjust.
2. Press the
▲
(UP) or
▼
(DN) arrow navigation keys to scroll to
the desired interactive variable.
3. When a user arrives at a screen whose variable needs to be
changed, the user should depress and hold the ENTER button
until the blinking cursor is displayed.
4. After the blinking cursor is displayed the user simply presses
the
▲
(UP) or
▼
(DN) arrow buttons to increment or
decrement to the appropriate desired value.
5. When the user reaches the desired value the user should press
the ENTER button again to apply the change to the PCM
memory. The PCM then programs the corresponding module
to the new setting.
Excellent =
>30 dB >38 dB >38 dB
Good =
25—30 dB 30—38 dB 35—38 dB
Marginal = 18—25 dB 23—30 dB 30—35 dB
Non-Functional =
<18 dB <23 dB <30 dB
8VSB 64 QAM 256 QAM