4.7.6 The VB262 Dual QAM/8VSB Demodulator Module (VB220 Option)
The VB262 QAM/8VSB demodulator is an optional input interface module. It has two RF
inputs; one or two of these are enabled according to probe licensing.
The connectors are:
QAM/VSB 1:
RF input – 75 ohm F-connector
QAM/VSB 2:
RF input – 75 ohm F-connector
GPI:
Alarm relay output – 9 PIN D-sub male
GPI – Pinout of alarm relay output (to be implemented)
Normal operation
Alarm/Power off
Pins 6-7: Contacts closed
Pins 6-7: No connection
Pins 7-8: No connection
Pins 7-8: Contacts closed
Pin 5: Gnd
Pin 5: Gnd
Two LEDs indicate whether the demodulators lock to the incoming RF signals or not.
PROBE USERS' MANUAL VERSION 5.0
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