Appendix A. Using The Optional Time Decoder Input - Nielsen 1000-1161 Series Equipment Manual

Equipment Manual: Encoder 1000-1161
Document #: 1050-1475
Revision: F

Appendix A. Using the Optional Time Decoder Input

Using the Optional Time Decoder Input
The SGE's internal clock, just like any other clock, can drift. Many encoder models use an optional
Time Decoder Input to reduce the overall clock drift to match that of the station clock.
If the Time Decoder Input is enabled, to ensure that the encoder will synchronize to the station clock
upon boot-up one of the supported time code sources must be properly connected to the time code
input prior to applying power to the encoder. To support the time decoder functionality, the correct
encoder software and the appropriate encoder configuration must be installed on the SGE.
The time code source must meet the following requirements:

The RoHS Compliant 1U analog encoder supports the following timecode formats: IRIG-B
(un-modulated), SMPTE 12M-1 (30 FPS), EBU (complying with SMPTE 12M-1 at 25 FPS),
ESE TC89, or ESE TC90.

The allowable working limit voltages for the time code source signals are:

BNC Input:

Push-Tab Inputs:
ABSOLUTE MAXIMUM INPUT SHOULD NOT EXCEED 11 Vp-p. Exceeding this level risks
damage to the unit.
If the Time Decoder Input is not used or does not have a valid time code connected, then the encoder
will use its internal real time clock, but the encoder internal real time clock will not be synchronized to
the station clock.
Connecting an External Time Source
If you have determined that the SGE time decoder is enabled, follow these instructions to connect
one of the supported time sources to the encoder. Use Figure 10 for reference. The encoder can
accommodate time sources that use either a single-ended coaxial connector or bare wires to be
inserted into push-tab inputs. Do not connect time code signals to both the BNC inputs and the push-
tab inputs at the same time.
If the time code source supplies a single-ended coaxial connector:
Connect the time code source (station clock) to the BNC input at the rear of the encoder.
logic 'high': Minimum 3.0 Vp, Maximum 5.0 Vp.
logic 'low': Minimum 0.0 Vp, Maximum 0.4 Vp.
Minimum 300 mV p-p, Maximum 7 V p-p.
(For either differential or non-differential input signal)
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