BURK Technology RX-4 Bedienungsanleitung
RX-4
USER’S MANUAL
May 28, 1997
Version 1.01
BURK Technology
7 Beaver Brook Road
Littleton , MA 01460
RX-4 User’s Manual -- Version 1.01 BURK Technology
BURK Technology RX-4 User’s Manual -- Version 1.01
i
RX-4 USER’S MANUAL
Contents
INTRODUCTION.........................................................................................................1
PRODUCT DESCRIPTION.........................................................................................2
RX-4 Features and Overview.................................................................................................2
Specifications..........................................................................................................................3
RX-4 Front Panel ...................................................................................................................4
RX-4 Back Panel ....................................................................................................................6
INSTALLATION AND CONFIGURATION ..............................................................8
Physical Installation................................................................................................................8
Antenna Installation ...............................................................................................................8
Connecting The Audio Outputs..............................................................................................9
Making Connections for the Loop-Through (Hot Standby) Feature...................................10
How the Loop-Through Feature Works........................................................................................10
Connecting the Receivers for Hot Standby...................................................................................11
Powering Up.........................................................................................................................11
TUNING AND ADJUSTMENT .................................................................................14
Selecting the Monitoring Frequencies for the Receivers......................................................14
AM Receiver Tuning .....................................................................................................................15
FM Receiver Tuning......................................................................................................................17
WX Receiver Tuning.....................................................................................................................19
Adjusting Audio Output Levels...........................................................................................21
Monitor Selection and Volume Adjustment .........................................................................22
Technical Support ................................................................................................................23
APPENDIX: RX-4 SCHEMATICS
RX-4 User’s Manual -- Version 1.01 BURK Technology
ii
BURK Technology RX-4 User’s Manual -- Version 1.01
1
INTRODUCTION
This document is a User’s Manual for the Burk Technology RX-4, a professional-quality, digital-tuned,
four-channel radio receiver expressly designed for use with Emergency Alert Systems, in particular the
Burk Technology EúAúS unit.
The first part of this User’s Manual presents an overall description of the RX-4, featuring notes and
illustrations on the arrangement and functions of the front and back panel components, plus a set of
technical specifications (see “Product Description,” p. 2).
In the next section, the instructions are provided for installing and configuring the RX-4, including
physical installment of the unit (rack-mounting), antenna connections, wiring to the EúAúS, and the
implementation of the loop-through feature for hot standby (see “Installation and Configuration,” p. 8).
The final section details the operational adjustments required for putting the unit into service, including
tuning the receivers (featuring easy-to-use tuning charts for each module), adjusting audio output levels,
and selecting the receiver to monitor within the unit (see “Tuning and Adjustment,” p. 14).
Schematics (for the AM, FM and WX receivers, and the monitor amplifier) appear in the Appendix.
RX-4 User’s Manual -- Version 1.01 BURK Technology
2
PRODUCT DESCRIPTION
This section of the manual features an overall description of the RX-4, physically and functionally,
including a set of technical specifications -- for the unit as a whole, and for each of its component
receivers. It concludes with keyed illustrations of the front and back panels.
RX-4 Features and Overview
The RX-4 integrates four modular receivers, designed and packaged to provide a complete single-unit
solution to the requirements of Emergency Alert System (EAS) applications. Though it has been
designed, along with the LX-4 audio switch, to be a companion to the Burk EúAúS unit, the RX-4 will
provide superior performance with any EAS equipment.
As its standard configuration the RX-4 features an AM receiver, two FM receivers, and a NOAA Weather
Radio (WX) receiver -- the most adaptable conformation for handling the range of EAS monitoring
assignments in a single, easily installed, convenient-to-use unit.
Beyond the essential robustness and quality of its design, materials, and workmanship, the RX-4 is
specifically geared toward EAS applications in the professional environment by virtue of the following
features:
•Digital tuning, which keeps the RX-4 receivers locked on frequency, and capable of meeting the strict
demands of EAS operations, where receiver drift can mean missed alerts. Furthermore, tuning
controls are located inside the unit, providing the user with protection against the casual or
inadvertent changes in tuning that could cause lapses in compliance.
•High-performance receivers, with superior overload protection, enable the unit to be used in high-RF
surroundings, and near transmitting equipment, without compromising signal sensitivity or output.
•Loop-through capability, that permits chaining of the receivers (within a single unit, or even among
separate units) in a “hot standby” mode, both for maximum backup and for automatic coverage when
an assigned source is off the air.
Before we proceed to discussing how to install the unit, please take a moment to examine the technical
specifications on the next page, and to familiarize yourself with the RX-4 controls, indicators, and
input/output connections, presented in the front- and back-panel illustrations that appear following.
BURK Technology RX-4 User’s Manual -- Version 1.01
3
Specifications
General
Receivers 4 interchangeable modules in any combination of AM, FM , & NOAA
Standard configuration is 1 / AM, 2 / FM, & 1 / WX
Monitor Amp 0.5W audio amp with built-in speaker
Monitor Channel Select Push-button with LED indication of monitored channel
Audio Connectors Combicon plug-in terminal strap type
Power Requirements 115VAC, 30W
Power Connector 6-1/2’ EIA power cord
Physical Size EIA rack mount; 19”W x 9”D x 1-3/4”H
AM Receiver Module
Frequency Range Digitally tuned 540 - 1720 KHz in 10 KHz steps
Sensitivity 5 microvolts for 12dB SINAD
AGC Range 80dB
Image Rejection 90dB
Adjacent Channel Rejection 45dB
Spurious Rejection 80dB
Overload Level -10dBm
Antenna 75-ohm Type F connector
THD <3% @ 30% modulation
Audio Output 10dBm max. into 600 ohms, balanced, fully adjustable
FM Receiver Module
Frequency Range Digitally tuned 88 - 108 MHz in 100 KHz steps
Sensitivity 5 microvolts for 12dB SINAD
IF Rejection 90dB
Image Rejection 60dB
Overload Level +20dBm
Antenna 75-ohm Type F connector
THD <3% @ 50KHz deviation
Audio Output 10dBm max. into 600 ohms, balanced, fully adjustable
WX Receiver Module
Tuning Range Digitally tuned to all 7 NOAA channels
Sensitivity 5 microvolts for 12dB SINAD
Image Rejection >60dB
Adjacent Channel Rejection 45dB
Spurious Rejection >60dB
Overload Level 0dBm
Antenna 75-ohm Type F connector
Audio Output 10dBm max. into 600 ohms, balanced, fully adjustable
RX-4 Front Panel
Cover
⇐Plates
Removed
NOTE: The type, number, and positions of the various receiver modules represent the standard configuration. Your unit may have been ordered with a different modular configuration; if so, disregard the illustrated left-to-right ordering of the
individual receiver units and reference them instead by type. If you’re not certain which receiver type occupies a particular module, they can be readily distinguished from one another by the number and arrangement of their tuning switches;
refer to the Tuning Control illustrations on pp. 15, 17 and 19.
12 9
10 11 12 17 18 19 20
34 25 26 27 28 33 34 3635
Receiver Module #1 (AM) Receiver Module #2 (FM) Receiver Module #3 (FM) Receiver Module #4 (WX) Monitor Section
6 7 8 14 15 16 22 23 24 30 31 32
5 13 21 29
#ID Functions / Features
Receiver
Module #1
(AM)
Receiver
Module #2
(FM)
Receiver
Module #3
(FM)
Receiver
Module #4
(WX)
Monitor
Section
1 9 17 25 Signal Indicator Lights when module is receiving signal
2 10 18 26 Output Level
Adjustment Opening for adjusting output audio pot without removing
cover plate; admits 0.1” flat-blade mini-screwdriver
3 11 19 27 Cover Plate Removable panel; detaches for access to tuning controls
4 12 20 28 Write-On Strip
(with Module #) Erasable polycarbonate labeling surface; for marking call
letters or frequency of tuning-selected signal source
5 13 21 29 Cover Plate Screws Phillips-head screws securing cover plate
6 14 22 30 Signal LED Illumination for signal indicator
7 15 23 31 Output Audio Pot One-turn potentiometer; for setting output audio level of
receiver; adjusted by 0.1” flat-blade mini-screwdriver inserted
through output level adjustment opening
8AM Tuning Controls 10-position DIP switch, accessed by removal of cover plate;
settings determine tuning frequency of AM receiver; tuning
chart provided on p. 16
16 FM Tuning Controls Two banks of DIP switches, 8-position and 4-position,
accessed by removal of cover plate; settings determine tuning
frequency of FM receiver; tuning chart provided on p. 18
24 FM Tuning Controls Two banks of DIP switches, 8-position and 4-position,
accessed by removal of cover plate; settings determine tuning
frequency of FM receiver; tuning chart provided on p. 18
32 WX Tuning Controls 7-position DIP switch, accessed by removal of cover plate;
settings determine tuning frequency of WX receiver; tuning
chart provided on p. 20
33 Monitor Speaker Unit studio monitor; plays audio from currently selected
receiver
34 Monitor Select
Switch Push-button switch; sequentially selects receivers 1 -4 for
monitoring; fifth selection is OFF (no monitor)
35 Monitor Select
Indicator Row of LEDs , numbered 1-4; lit when corresponding receiver
selected for monitoring
36 Volume Control Controls speaker volume (independent of receiver output level
adjustment )
RX-4 Back Panel
#ID Description / Connections
1Power Connection AC input 115 VAC; EIA-type
Receiver #4 (WX) [Weather Radio]
2Loop-Through 2 pins of Combicon 5-pin female connector; IN and OUT; provides chaining to other receivers for hot standby
3Audio Output 3 pins of Combicon female connector; balanced output (+, -, grd) to EúAúSencoder/decoder
4Antenna Connector Female F-type connector; to FM antenna or yagi via male F-type connector
Receiver #3 (FM)
5Loop-Through 2 pins of Combicon 5-pin female connector; IN and OUT; provides chaining to other receivers for hot standby
6Audio Output 3 pins of Combicon female connector; balanced output (+, -, grd) to EúAúSencoder/decoder
7Antenna Connector Female F-type connector; to FM antenna via male F-type connector
Receiver #2 (FM)
8Loop-Through 2 pins of Combicon 5-pin female connector; IN and OUT; provides chaining to other receivers for hot standby
9Audio Output 3 pins of Combicon female connector; balanced output (+, -, grd) to EúAúSencoder/decoder
10 Antenna Connector Female F-type connector; to FM antenna via male F-type connector
Receiver #1 (AM)
11 Loop-Through 2 pins of Combicon 5-pin female connector; only Loop OUT chaining for hot standby (Loop IN non-
functional)
12 Audio Output 3 pins of Combicon female connector; balanced output (+, -, grd) to EúAúSencoder/decoder
21 3 4 5 6 7 8 9 10 11 12 13
Receiver #4 (WX) Receiver #3 (FM) Receiver #2 (FM) Receiver #1
(AM)
Inhaltsverzeichnis
