Ross 4500DR-104-07, User Manual, Page: 73 / 161

SRG-4500 User Guide (v7.0) Front Panel Menu System • 73
Figure 7.16 Genlock Menu Example
Genlocking to an External Video Reference
The SRG-4500 Genlock to an external video reference in the following manner. As soon as a video reference is
applied, it is evaluated, usually within 2 seconds, and, if valid, the Genlock system performs an initial “quick-lock”
to quickly achieve field and line lock. Then, a “slow-lock” is performed in order to achieve sub-carrier lock, and
ultimately Sc-H lock. Both of these lock modes are designed to “glide” the SRG-4500 video output(s) smoothly
towards the required lock point.
For situations where the reference and the SPG output are quite close to each other timing-wise, this Genlocking
process may happen quite quickly, within a few seconds or so. At other times, especially when a PAL reference is
four fields removed from the required lock point, the process to complete the full Genlock process may take as long
as 15 seconds.
Figure 7.17 Genlock to External Video Reference
All but two of these menu lines report status information regarding the Genlock system. The remaining two items
(Lock Mode and Unlock Mode) can be configured by the user.
Lock Mode
This menu line allows the user to select the required Genlock mode of the SRG-4500. The options in the field are:
• Internal Lock — Locks to the internal 10MHz oscillator
• Genlock — Lock to an external CVBS video signal
— GPS Status Locked =
— NTP Status Locked to NTP =
— Ref Signal 1080 59.94p =
— Lock Status Locked =
Unlock Mode Relock =
Lock Mode = Internal Lock
— MHz Status =
— VITC Status VITC Found =
7 7 7 7 7 7 7 7 7 7 7
Sync
Burst
Presence
VITC
50Hz
59.94Hz
60Hz
6Hz
23.98Hz
24Hz
5.994Hz
Reference
Loop
Input
Crash Lock/Free Run
To All Generators
F V H
Detectors