AJA R Series, Installation And Operation Manual

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8
Warning!
FR2 Dual Power Cord Notice—please read this. To reduce the risk of electrical
shock, disconnect both power cords before servicing equipment.
Caution!
The FR1/FR2 front fan door is heavy and is not hinged. Remove with Caution.
Instructions for removing the frame front door for module installation is discussed in
the
FR1/FR2 User Manual.
External
Reference
Information
The R20AD expects the External Reference to be an NTSC or PAL analog Color Black
signal. The External Reference input can come from two different sources on the
R20AD. There are jumpers on the R20AD (see figure below) for selecting the external
reference source and for optionally terminating the selected reference source.
Looping Reference
The R20AD cell group of 9 BNCs contains two BNCs that can be used for a looping
reference connection. If this method is used, then the reference select setting on the
R20AD should be set to “LOOP” and the TERMINATION setting should be set to “OFF”
(no termination). Optionally, if you’re using only one of the looping reference BNCs,
then the TERMINATION setting should be set to “ON.”
Frame Reference
Alternatively, the R20AD installed in a FR1 or FR2 frame can use the frame’s frame
reference input BNC connector, which feeds an external reference video signal to all
modules installed in the frame. How the signal is distributed differs for the FR1 and
FR2 frames. Additionally, individual modules can usually be strapped as to whether
external reference is distributed from the frame or directly to BNCs on the module’s
corresponding cell group (the 9 BNCs on the rear panel).
FR1 Frame: the external reference signal is distributed passively to all frame
modules. If you wish to use the frame reference, the R20AD should have
“FRAME” reference selected on the module strapping, and one and only
one card in the frame should have “TERMINATION” set to “ON.” All other
cards in the frame should have TERMINATION set to “OFF.”
FR2 Frame: the external reference signal is distributed by an in-frame
distribution amplifier to all frame modules. This system terminates the
Frame Reference input BNC and buffers the signal to all slots. If using frame
reference, the R20AD installed in the FR2 frame should have “FRAME” set
for reference select, and all cards should have TERMINATION set to “OFF.”