COMTEK BST 75-216 User Manual

BST 75-216 OPERATOR’S MANUAL (216 MHz)

Mini Base Station
Transmitter

357 West 2700 South • Salt Lake City, Utah 84115 • Phone: [phone] • Fax: [phone] • www.comtek.com

TABLE OF CONTENTS

Introduction ...........................................................

Equipment Placement ...............................................

Power Requirements .......................................................

Remote Antenna ......................................................

Screw-in Whip Antenna ............................................

Audio Input Connections ...............................................

Audio Adjustments ...............................................

Audio Processing Circuit ..........................................

Front and Rear Panel Facilities ........................................

Frequency Information ..........................................

Accessories ..........................................................

Specifications ......................................................

Warranty and Service ...............................................

NOTE: This equipment has been tested and found to comply with the
limits for a Class A digital device, pursuant to part 15 of the FCC Rules.
These limits are designed to provide reasonable protection against
harmful interference when the equipment is operated in a commercial
environment. This equipment generates, uses, and can radiate radio
frequency energy and, if not installed and used in accordance with
the instruction manual, may cause harmful interference to radio
communications. Operation of this equipment in a residential
area is likely to cause harmful interference in which case the user
will be required to correct the interference at his own expense.

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© 2011 COMTEK® All rights reserved
Printed in U.S.A. 01-05-2011

INTRODUCTION

BST 75-216

Mini Base Station
Transmitter

he BST 75-216 mini base station transmitter meets the highest

T

professional standards while offering outstanding value and the
most advanced technology available. This versatile and innovative
transmitter is simple to use, yet it has sophisticated features such as
“Flash Memory” 57-channel programmability with a synthesized
manual 10-channel selectable user-switch. Plus a unique multi-function
RF indicator detects antenna problems, bad or incorrect antenna, and
open coaxial cable for quick and easy trouble shooting.

The audio processing circuit produces full fidelity frequency
response from 100 Hz to 10 kHz with very low residual FM noise
and distortion. To accommodate a greater variety of receivers, the
BST 75-216 can operate with non-companded receivers or with
companded receivers for higher fidelity sound reproduction with a
system signal-to-noise ratio of up to 90 dB.

All this is designed into a sturdy, compact, all-metal enclosure suitable
for permanent rack-mount installations or can be battery powered for
stand-alone portable applications.

Page 1

OPERATING INSTRUCTIONS

Equipment Placement

If the BST 75-216 base station is to be rack mounted, a remote antenna
must be used. The base station should be mounted away from equipment
that uses large power transformers to reduce 60 Hz hum possibilities.

Special Note: When using the base station in close proximity to other
audio equipment, ensure that the audio equipment is not susceptible to
RF interference. This can be accomplished by temporarily installing
the base station, and then while the base station is operating, checking
all audio outputs for uncharacteristic noise. If a problem is found,
move the base station or the remote antenna as far as possible from the
affected equipment. Should you continue to have problems, contact
COMTEK’s Technical Support Services for assistance.

Power Requirements

The BST 75-216 base station is designed to be powered by 12 volts DC.
The standard barrel type power jack (5.5mm X 2.1mm) is nonpolar and
will accept either ± 12 volt DC on the center pin. The switching power
supply adaptor which is included is
a universal input type that will
accept 100-240 volt, 47-63 Hz
(AP-12V1-75). The on/off switch
on the front panel of the base
station transmitter should be
turned to the “off” position
when the power plug is
initially plugged into the
transmitter.

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OPERATING INSTRUCTIONS

Remote Antenna

When the BST 75-216 base station transmitter
is to be rack mounted for permanent
installation, a remote antenna must be
used. For high performance when greater
coverage is required, the Phase-Right or
Mini-Mite 1/2 wave omni antenna should
be used. These antennas must be placed
vertically polarized up to 15 feet away from
the transmitter with the coaxial cable
supplied. The highest possible antenna
placement away from any metallic object is
best. For high gain directional yagi type
antennas and specialty antennas, contact
COMTEK’s Technical Support Services.

Short Loaded Whip BNC Antenna

If the BST 75-216 base station transmitter
is to be used outside of the traditional
rack-mounted environment for
stand-alone mobile type applications,
the short loaded whip antenna
(SLW 75-216) can be used. The
transmitter should be placed on a
table or platform as high as possible
and away from any metallic object.
The radiated output power of the
transmitter with this short loaded
whip antenna will not be as
great as the remote antennas.
The BST 75-216 transmitter
should be used only in the high
power setting when the short
loaded whip antenna is used.

1/2 Wave
Mini-Mite

Phase-Right

SLW 75-216

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