VLK4/FTB - quad linear key inserter
with fade to black (PAL/NTSC)
desk or rack remote control


  • Four layer linear keying, automatic PAL or NTSC
  • Factory preset 100% linear keyer, CLIP and GAIN control for non-linear one
  • REVIEW, lets you preset of 100% linear keyer or CLIP and GAIN levels before the insertion on line
  • Automatic or manual FADE IN and FADE OUT for KEYERS, PGM1 and PGM2
  • Auto transition adjustable timing, manual knob transition or cut button
  • Possibility to fade simultaneously BACKGROUND and KEY (1, 2, 3, 4) signals
  • [KEY1],[KEY2],[KEY3],[KEY4],[PGM FADE],[PGM1/PGM2] push buttons select the desired next transitions
  • Remote control for desk or rack
  • Accumulative KEY and FILL OUT: Accumulative keying allows any combination of the four inputs to be selected and aired simultaneously, providing multiple key capability in a single Keyer
  • Automatic bypass to background video upon loss of power

VLK4 is a NTSC/PAL single RU/19" device which enables insertion of 4 separate linear keys.
All VLK4's functions are operable by a remote control.
VLK4 is the solution to all  problems caused by the insertion of titles on video images.
As you know, a "hard key" titling often determines a confusion between the signals and causes the well known "sparkling edges" effect.
Our equipment, on the other hand, thanks to its linear key transparent titling, provides the best sharpness of the video edges and an extreme transparency of the incoming video signal.
This enables a multi-layer titling (BACKGROUND, MID-BACK, MID-FORE and FOREGROUND etc.).
The linearity of the titling, is made possible by a signal of control KEY which determines the mixing level of main picture (BACKGROUND) and titling signal (FOREGROUND).

For instance

  • whenever the KEY signal is at 25% level, the two signals (BACKGROUND and FOREGROUND) are respectively at 75% and 25%.
  • whenever the KEY signal is at 100% level, the mixing determines the erasing of BACKGROUND and displays 100% of FOREGROUND signal.

Desk remote control


Many video mixers do not allow the linear insertion because their performances are limited to the "hard Key" type.
The VLK4 can be added up to your mixer to update the keyer system.
Furthermore, VLK4 has KEY and FILL outputs which, if connected to the video mixer's KEY input, provide to the latter all the engaged keys just by using the KEY control on the mixer.

Rack remote control (1/2 1RU)


Thanks to its features, VLK4 can be employed for various applicatons.
The sector of graphical images is surely the one where you can get better results by using a linear key transparent insertion.
For example it provides fade or curtain effects between BACKGROUND and FOREGROUND or the insertion of an animation on live images.
For further information, for full specifications, do not hesitate to contact us.

VLK4/FTB - Pannello posteriore 


Input-Output Characteristics

PGM Inputs Pgm1 primary looping inputs (is also genlock reference)
Key Inputs 4 effects key looping inputs
4 effects fill looping inputs
Video Outputs 1 Preview
2 Program
1 Key
1 Fill
Data 9 pin connector RS 422 for the remote control

Video System characteristics (on program output)

Differential Phase <
Differential Gain  < 0,5%
PGM Bandwidth ±  0.1 dB DC to 8 MHz
Path Length Deviation  ±
Absolute Delay   45 ns
Crosstalk   > 54 dB at 4,43 MHz
2 T k_factor  < 0,3%
Lum. non-linearity < 2%
YC Delay   < 6 ns
SNR (WGT) > 65 dB

Mechanical and power characteristics

VLK4 Panel  1 Ru, depth 31 cm (with connector)
Weight: 3,5 Kg.
Remote control desk Dimensions: 19 x 14 x 5 cm
Weight: 0,5 Kg.
Remote control rack Weight: 0,5  Kg.
Input power 110 or 220 Vac  50-60 Hz
Power consumption 20 VA

In accordance with constant improvement policy of products, El.Man (Elettronica Mangione) reserves the right to modify without notice and at any time, features and prices of its own apparatus.