User guide

CCU Hardware Reference Theory of Operation
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3.4 Section 3 – Comparator A/B Select
The Comparator A/B Select section has a similar Toggle function as the
Main/Standby function.
There are three external inputs:
• /Comp Toggle 1 (from Console 1)
• /Comp Toggle 2 (from Console 2)
• /Comp Toggle 3 (from Console 3)
There are four logic outputs:
• /Comp A Select 1 (Normal)
• /Comp A Select 2 (Normal)
• /Comp B Select 1 (Inverted) To Comp B Select Relay
• /Comp B Select 2 (Inverted) To Console Input
Note that each output can drive only (1) RYB-8 relay. If you need to control
multiple relays (for TX Audio, Rx Audio & COR), you will have to use one relay
to buffer the coils for the other relays.
3.5 Section 4 – RX Normal / ECS Select
The Rx Normal / ECS Select section has a similar Toggle function as the
Main/Standby function.
There are three external inputs:
• /Rx Toggle 1 (from Console 1)
• /Rx Toggle 2 (from Console 2)
• /Rx Toggle 3 (from Console 3)
There are four logic outputs:
• /Rx Normal Select 1 (Normal)
• /Rx Normal Select 2 (Normal)
• /Rx ECS Select 1 (Inverted) To RX ECS Select Relay
• /Rx ECS Select 2 (Inverted) To Console Input
The RX ECS select can be used to disable the comparator repeat function. See
details in Section 2 - Repeater Control.