User's Manual

Screen Service SDT 200UB – SDT 500UB ARK-1 ATSC Operations
July, 2009 v 1.0 Page 3 - 53
Box
Parameter /
Control
Description Admitted Ranges / Values I/A
System Mode &
Autoswitching
Switching Time Time and date setting for modes switching when Time Switch mode is enabled. I/A
Mode A / Mode B Mode A / B
Selector of working mode.
Two different working modes are provided:
• ITU 470 modulator
• ATSC modulator
• ITU 470
• ATSC
I/A
Mode A / Mode B Channel Selector of the UHF input channel used as RF input.
• Min: 14
• Max: 77
A
Mode A / Mode B Offset [Hz] Frequency offset from the channel center frequency of the RF input. 1 Hz step variation.
• Min: -4 MHz
• Max: 4 MHz
A
Mode A / Mode B
Squelch
[dBm]
Squelch alarm threshold expressed in dBm. Input is squelched when the RF level is under this threshold.
• Min: -70
• Max: -20
A
Mode A / Mode B S/N Thr [dBm] Not implemented - Signal / Noise alarm threshold
• Min: -10 dBm
• Max: –50 dBm
A