RDL ST-VP1 Data Sheet

STICK-ON® SERIES

Model ST-VP1
Voice-Over/Paging Module

ANYWHERE YOU NEED...

• High Quality Voice-Over Mixing

• Noiseless Paging

• A Single Input Adapted for Paging or

Voice-Over

• Selectable Fade-Under or Hard-Cut

• Adjustable Fade Depth and Rate

• Soft Audio Switching

You Need The ST-VP1!

APPLICATION: The ST-VP1 is part of a group of products in the STICK-ON series from Radio Design
Labs. The durable bottom adhesive permits quick, permanent or removable mounting nearly anywhere or
use it with RDL’s racking accessories. The ST-VP1 offers the ultimate in quality preset mixing functions
for voice-over and paging applications, with a big plus, you can put it right where you need it!

FUNCTIONAL DESCRIPTION: The exceptional audio quality together with the reasonable cost of the
ST-VP1 makes it equally useful in voice-over studio recording applications and in paging installations.
The module is a line-level device with two inputs; MUSIC and VOICE. The MUSIC input normally feeds
the output when no control option is selected. Two control options are available; FADE and CUT. When
FADE is externally selected (FADE terminal connected to ground), the MUSIC source is faded down, and
the VOICE source is turned on. When the FADE terminal is released, the voice source is turned off and
the music source fades back up. The fade rate, and fade depth are both adjustable on multi-turn trimpots.
When the CUT terminal is selected (CUT terminal connected to ground), the music source is switched off
and the voice source is switched on. When the CUT terminal is released, the voice source is switched off
and the music source is restored. All switching and fading is accomplished electronically for noiseless
operation.

PAGING APPLICATION: The ST-VP1 can be wired to constantly feed a line-level input of a paging
amplifier. Line-level music and voice sources feed the module. The voice source may be a telephone
paging signal at line level, or a microphone which has been preamplified up to line-level (See RDL STM-1,
STM-2, STM-2X, STM-3 Microphone Preamplifiers). If the professional sound of music fading under the
page is desired, the FADE terminal is used to select the page function. If a hard-cut is desired to get
people’s attention for emergency pages, the CUT terminal can be used. Innovative systems can be
created by cascading modules for prioritized messages. A two-unit system would incorporate a ST-VP1
to operate the music fade for insertion of messages from a message repeater. The output of this module
would feed a second ST-VP1 used in the cut paging. In this way, messages can be professionally
mixed with background music, while attention-getting pages always take priority.

RECORDING APPLICATION: Many recording applications, such as narrations or commercial
announcements, as well as on-air broadcast, use can be enhanced by uniform voice-over audio levels
and fades. The superb audio clarity of the ST-VP1 makes it useful as the final mix device in this type
studio. Using the ST-VP1 to mix the studio mic in after the studio mixer output can permit processing of
the mic signal separate from the studio mixer. The ST-VP1 can be used together with other Stick-On
modules for creative control. Microphone signals can be tailored and controlled with modules such as the
STM-2 Mic Preamplifier, ST-EQ3 Equalizer and ST-CL1 Compressor/Limiter. Control of the ST-VP1 can
be made convenient for announcers by using a lighted momentary pushbutton together with an ST-LCR2
alternate-action relay for control. The ST-VP1 can be the heart of many innovative systems in quality
voice recording and broadcasting!

RDL •• P.O. Box 1286 •• Carpinteria, CA., USA 93014 •• [phone] •• FAX [phone] •• http://www.rdlnet.com

STICK-ON® SERIES

Model ST-VP1
Voice-Over/Paging Module

Installation/Operation

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.

TYPICAL PERFORMANCE

COMMON:
Noise: < -85dB (below +4 dBu output)
Input Level: + 4dBu balanced (may be connected unbalanced)
Headroom: > 18dBu above +4 dBu
Output: +4 dBu balanced (may be connected unbalanced)
Gain: Unity (balanced)
Fade Rate: Adjustable 0.3 sec. to 1.3 sec. (for 20 dB fade)
Adjustable 0.2 sec. To 1.0 sec. (for 12 dB fade)
Fade Depth: Adjustable 3 dB to 40 dB (Music Input)
MUSIC SOURCE:
Frequency Response: 10 Hz to 20 kHz (+/- 0.25 dB)
THD: < 0.010%
Attenuation When Muted: > 65dB
VOICE SOURCE:
Frequency Response: 30 Hz to 20 kHz (+/- 0.25 dB)
THD: < 0.010%
Attenuation When Muted: > 80 dB
Power Requirement: 24 to 33 Vdc @ 45 mA, Ground-referenced

891-0024G

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