RDL TXVLA1 Specifications

TX™ SERIES

Model TX-VLA1
Video Line Amplifier

ANYWHERE YOU NEED...

• To Boost Video Levels

• Adjustable Video Level

• Adjustable Equalization

• To Drive Long Video Lines

• Video Amplifier Powered from Available

Voltage Sources

• High Quality Video in Small Size

You Need The TX-VLA1!

The TX-VLA1 is part of the group of versatile TX series from Radio Design Labs. TX series feature the
advanced circuitry and high quality connectors for which RDL products are known. The ultra-compact TX
series can be mounted in limited space using the adhesive methods popularized by RDL’s STICK-ON
Series. The TX-VLA1 may be mounted directly to a backboard using optional mounting brackets available
from RDL.

APPLICATION: The TX-VLA1 is the ideal choice in installations where video signals are being fed into
long cables, or where a low video signal needs to be amplified. The unique power supply input allows the
TX-VLA1 to be powered from a wide variety of existing ac or dc power sources.

Security or surveillance cameras are frequently located significant distances from monitoring or recording
equipment. Cable losses produce a decrease in the overall video level. High-frequency attenuation in the
cable produces additional loss of higher-frequency components of the video signals. These combined
losses result in degradation of color signals, and decreased resolution in black-and-white images. The
TX-VLA1 can be located right at the camera and adjusted to compensate for both losses. Gain and
equalization may be adjusted on the TX-VLA1 to drive video cables as long as 2000 feet (600 meters).

The TX-VLA1 power supply input accepts an ac or dc voltage from 12 to 24 volts. This versatile
arrangement typically makes it possible to run the module from the same supply as the camera. 12 Vdc
batteries may power the TX-VLA1 in broadcast applications; a common low-voltage ac supply may power
the module together with the camera in security installations provided the camera is internally ground­referenced. The TX-VLA1 is a negative ground referenced product. In the unlikely event it is connected on
a common ac supply together with a camera which is positive ground-referenced and not transformer
isolated, a ground fault may occur. The TX-VLA1 automatically detects such a fault, disconnects itself
from the power input, and illuminates the FAULT LED. This alerts the installer to transformer isolate the
TX-VLA1 power source from the camera power source. This unique circuit protects both the camera and
TX-VLA1 from damage. RDL’s available PS-24 power supply may be used to power the module when
isolation is required, or in any other installation.

The TX-VLA1 is supplied with a chart showing recommended beginning settings of gain and equalization
for various lengths of cable. The settings may then be further fine tuned for an optimum, high-quality
video transmission.

For installations where high quality video signals must drive extended cable lengths, the TX-VLA1 is the
ideal choice. Use the TX-VLA1 individually in NTSC or PAL systems, or combine it with other RDL
RACK-UP

®

, STICK-ON®, TX, or FLAT-PAK™ series products as part of a complete audio/video system.

®

RDL • 659 N. 6th St. • Prescott, AZ., USA 86301 • [phone] • FAX [phone] • www.rdlnet.com

TX™ SERIES

Model TX-VLA1
Video Line Amplifier

SECURITY

CAMERA

POWER

OUTPUT

24 VAC

SUPPLY

INPUT

GAIN

EQ

12-24 V

AC OR DC

POWER

FAULT

OUTPUT

LONG 75 OHM

CABLE

POWER

Installation/Operation

ANY POLARITY

SECURITY

CAMERA

EN55103-1 E1-E5; EN55103-2 E1-E4

Typical Performance reflects product at publication time
exclusive of EMC data, if any, supplied with product.
Specifications are subject to change without notice.

OUTPUT

INPUT

12-24 V

AC OR DC

POWER

EQGAIN

RDL PS-24A

SUPPLY

FAULT

OUTPUT

LONG 75 OHM

CABLE

If the FAULT LED. lights, isolate the TX-VLA1 power from the camera power

TYPICAL PERFORMANCE
Input: 75 Ω, BNC, Ground-referenced
Input Level: 1 V p-p video
Gain: Adjustable from Unity to +5 dB
Bandwidth: 10 MHz
Equalization Adjustment: Adjustable Flat to +4 dB @ 3.58 MHz; Flat to +7 dB @ 5 MHz
Equalization curve: Optimized at each setting for flattest response of video signal
components without square wave overshoot
Residual Noise: < -65 dB (referenced to 1 v p-p)
Output: 75 Ω source-terminated, BNC, Ground referenced
Power Requirement: 12 to 33 Vdc Ground-referenced OR 12 to 24 Vac, @ 30mA
Mounting: Bottom mount using adhesive strips provided; mount directly
to a flat surface using optional mounting brackets
Dimensions: Height: 1.4 in 3.6 cm
Length: 3.0 in 7.6 cm
Width: 1.2 in 3.0 cm

The TX-VLA1 power supply input accepts an ac or dc voltage from 12 to 24 volts. 12 Vdc batteries may power the TX-VLA1 in
remote applications. A common low voltage ac supply may power the module together with the camera in security installations
provided the camera is internally ground-referenced. The TX-VLA1 is a negative ground-referenced product. In the unlikely event it
is connected on a common ac supply together with a camera which is positive ground-referenced and not transformer isolated, a
“ground fault” may occur. The TX-VLA1 automatically detects such a fault, disconnects itself from the power input, and illuminates
the FAULT L.E.D. This alerts you to transformer isolate the TX-VLA1 power source from the camera power source.

Radio Design Labs Technical Support Centers

U.S.A. [phone], [phone]; Fax: [phone]

891-0165J

Europe [NH Amsterdam] (++31) 20-6238 983; Fax: (++31) 20-6225-287

Initial Settings for Specific Cable Lengths

(fine adjust for optimum video performance)