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Leader LT 4440 Changeover

BH #LELT4440 • MFR #LT4440
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Leader LT 4440 Changeover
Key Features
  • Switches from Primary to Backup Signal
  • Supports up to 11 Channels
  • Detects Errors in case of Amplitude Loss
  • LED Buttons for Errors & Faulty Channels
The Leader LT 4440 Changeover automatically switches the connection from the primary signal to the secondary back up line in case of problems with the primary signal. These signals include HD-SDI (channels 1 to 6 only), SD-SDI, AES/EBU digital audio, analog black burst signal, and tri-level sync signals. A total of 11 channels (including primary and back up signals) can be supported. When coupled with the LT 4400 Multiformat Video Generator, it can help detect problems on its primary line.
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Leader LT4440 Overview

The Leader LT 4440 Changeover automatically switches the connection from the primary signal to the secondary back up line in case of problems with the primary signal. These signals include HD-SDI (channels 1 to 6 only), SD-SDI, AES/EBU digital audio, analog black burst signal, and tri-level sync signals. A total of 11 channels (including primary and back up signals) can be supported. When coupled with the LT 4400 Multiformat Video Generator, it can help detect problems on its primary line.

The internal dip switch detects errors in case the signal's amplitude drops by 2 - 5 dB and switches to the secondary signal. Each signal is assigned an error level and the switch is made depending on this level. LED buttons on the front panel indicate the errors and the channel causing the error. You can set the delay of an error monitor depending on the rise time of the system signal source connected to the LT 4440 Changeover. When a key operation is not detected for 60 s, the panel key lock is automatically enabled.

Automatically switches the connection from the primary signal to the secondary backup line in case problems are detected on the primary signal
Signals include HD-SDI (channels 1 to 6 only), SD-SDI, AES/EBU digital audio, analog black burst signal, and tri-level sync signals
Can be coupled with LT 4400 Multiformat Video Generator to detect problems on its primary line
An internal dip switch detects an error in case the signal's amplitude drops by 2 - 5 dB and switches to the secondary signal
Each signal is assigned an error level and the switch is made depending on this level
LED buttons on the front panel indicate the errors and the channel causing the error
You can set the delay of an error monitor depending on the rise time of the system signal source connected to the LT 4440 Changeover
Panel key lock is automatically enabled when key operation is not detected for 60 s

Leader LT4440 Specs

Inputs
PRIMARY inputs: 1 input each for 11 channels (75 Ω BNC connector)

BACKUP inputs: 1 input each for 11 channels (75 Ω BNC connector)
Outputs
1 output each for 11 channels (75 Ω BNC connector)
Characteristics
Input/Output Characteristics (CH1 to CH11)

Return Loss:
30 dB 0 to 10 MHz
15 dB 10 to 750 MHz
10 dB 750 MHz to 1.5 GHz

Insertion Loss:
0.2 dB 0 to 10 MHz
0.5 dB 10 to 200 MHz
2.0 dB 200 MHz to 1.5 GHz

Cross Talk:
-60 dB 0 to 10 MHz
-30 dB 10 MHz to 1.0 GHz
-20 dB 1.0 to 1.5 GHz
Delay
Delay for Starting the Monitor

FAST: 1 minute or more (60 to 80 s)
SLOW: 4 minutes or more (240 to 320 s)

Select from two delay settings for starting the error monitor at power up according to the rise time of the system signal source connected to the LT 4440.
Input Signal
- HD-SDI (CH1 to CH6 only)
- SD-SDI (270 Mb/s)
- SD-SDI (143 Mb/s)
- AES/EBU digital audio
- Tri-level sync signal
- NTSC black burst
- PAL black burst

Set the type of input signal applied to the LT 4440 using the internal dip switch.
Signal Level
Determination Criteria of the Signal Level

Detection Level:
Detects an error when the amplitude of the input signal drops by 2 to 5 dB from the defined level and makes the switch.

The detection level varies slightly depending on the type of signal specified using the internal dip switch.

The detection level can be set to LOW or HIGH for each signal type.
Reference Level
When the Determination Criteria is Set to Low

HD-SDI
(CH1 to CH6 only): 450 to 635 mV (800 mV)
SD-SDI (270 Mb/s): 450 to 635 mV (800 mV)
SD-SDI (143 Mb/s): 450 to 635 mV (800 mV)

AES/EBU
Audio: 631 to 794 mV (1000 mV)
NTSC black burst: -180 to -227 mV (-286 mV)
PAL black burst: -190 to -238 mV (-300 mV)
Tri-level sync: 337 to 476 mV (600 mV)

When the Determination Criteria is Set to HIGH

HD-SDI
(CH1 to CH6 only): 505 to 713 mV (800 mV)
SD-SDI (270 Mb/s): 505 to 713 mV (800 mV)
SD-SDI (143 Mb/s): 505 to 713 mV (800 mV)

AES/EBU
Audio: 734 to 924 mV (1000 mV)
NTSC black burst: -210 to -264 mV (-286 mV)
PAL black burst: -220 to -277 mV (-300 mV)
Tri-level sync: 379 to 535 mV (600 mV)

User-Defined Detection Level Setting (CH7 to CH11 only)

USER setting 1: Set between -100 to -700 mV
USER setting 2: Set between -100 to -700 mV

Expansion of the Detection Level Using the Attenuator (CH7 to CH11 only)

Set the internal attenuator to expand the detection level further by 5 times

USER setting 1: Set between -700 to -3500 mV
USER setting 2: Set between -700 to -3500 mV


When a signal equivalent to the H.SYNC waveform is applied. The specifications of the detection level may not be achieved depending on the waveform shape.
Error Display
Total Error LED: Notifies errors by illuminating the error LED on the panel.

Error Channel LED: Detects the channel causing the error and notifies the channel by illuminating the corresponding LED.
Lock
Time to Key Lock: The key lock is automatically enabled when key operation is not detected for 60 s.
Control
External Control (REMOTE) Connector

Application: For external remote control

Inputs: RESET, AUTO SWITCHING, and TOGGLE SYNC

Outputs: FAULT and SYNC SOURCE

Connector Type: 9-pin Dsub connector
Power Requirements
90 to 250 VAC (no switching necessary), 50/60 Hz 25W max.
Environment
Operating Temperature: 32 - 113°F (0 - 45°C)
Operating Humidity: ≤90 % RH (without condensation)
Operating Environment: Indoor use
Operating Altitude: Up to 6562' (2000 m)
Overvoltage Category: II
Pollution Degree: 2
Dimensions
16.8 x 1.7 x 15.7" (426 x 44 x 400mm)
Weight
7.7 lbs (3.5kg)

Leader LT4440 Reviews

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