User's Manual

Rev B
3
INTRODUCTION
The SRX_400 is a data logging, tracking and telecommunicating receiver designed for a wide
range of applications. All of its internal functions are controlled by a dedicated microcomputer
with 64k bytes of program memory (EPROM) and 64K bytes of data memory (non-volatile static
RAM). Besides its regular housekeeping duties, which are automatic and invisible, the
microcomputer provides a number of basic and advanced operations which are accessed through
function keys and menus. Specifically, you may:
Control the receiver sensitivity (gain)
Set the operating frequency
Scan through one or more tables of frequencies
Search for signals in designated frequency bands
Obtain graphic and/or numeric signal strength measurements
Measure and display pulse intervals (rates)
Access the real time clock
Apply audio noise blanking (post-1994 models)
Software modules may be selected from a growing applications library to provide special
services like pulse width measurements, RS232 serial communications, autodial modem control,
temperature monitoring, pulse code discrimination, automatic data logging, etc.. Combined
hardware/software options offer selective switching of up to 8 antennas and provide up to
1Mbyte of additional memory for data storage.
This manual describes the basic operating functions of the SRX_400 common to all software
versions, as well as a number of "support services" available as options. Some of these services
(like serial communications support) cooperate with, or are required by, any of several high level
application programs, details of which will normally be supplementary to this manual. For
information on which options your version does or does not have, refer to the SRX_400
configuration sheet P/N 577, check the appendices, or try the keys.
The manual is organized in two main sections. The first section describes the receiver
hardware and basic key functions. The style is more or less that of a "formal definition"; the
information is complete, with little redundancy. In the second section the approach is more
tutorial, with numerous practical examples. For self-instruction, various paths are possible; for
reference, section 1 is the most concise.
We observe the following typographic conventions:
Example Type of object Typestyle
SCAN
Key
SMALL CAPS
SHIFT + SIGNAL
Keystroke sequence
SMALL CAPS
SCAN
Function or environment
named by key
BOLD SMALL CAPS
Interval
Function (selected from
menu)
Bold
Interval
Heading of section defining
menu item
Sans-serif Bold