RTU-292C Operations Manual
1-1
1
General Information
1.1
SCOPE
This instruction manual provides the information necessary to install, operate, repair and
maintain the RTU-292C Radio/Telephone Interface.
1.2
DESCRIPTION
1.2.1
GENERAL
The RTU-292C Radio/Telephone Interface Unit will provide a trouble-free automatic connection
between a radio system and telephone or other two-wire line. The unit is suited for use with HF,
VHF, UHF or satellite systems and is applicable to full or half-duplex modes. The RTU-292C
incorporates a full-featured telephone set and monitor speaker. Flexible switching allows many
operating scenarios.
A front panel keypad allows DTMF or Pulse dialing and the built-in handset is pushbutton-
selectable for communication with either the telephone or the radio. Since the telephone may
place and receive calls, the operator can quickly and easily establish a phone patch connection.
When used in the manual mode, the RTU-292C patches a telephone into a radio link by
essentially the same method as with a conventional phone patch; the quality of the patch however
is greatly improved. First, a radio-to-radio link is established. Then, using the telephone in the
RTU-292C, the operator places a phone call to the distant telephone that will be patched into the
radio link. Once the telephone-to-telephone link is made, the operator simply pushes a front panel
pushbutton. The RTU-292C adapts to the phone line, and the distant phone becomes part of a
telephone-to-radio-to-radio communications link. Once this link is established, the operator may
communicate with either party using the RTU-292C’s handset, and may monitor both sides of
the conversation with the speaker.
The RTU-292C uses a unique adaptive hybrid implemented with a DSP (Digital Signal
Processor) to eliminate conventional VOX and hybrid adjustments for a quick and simple set-up.
The unit works by measuring the characteristics of the telephone line. A short burst of white
noise is placed on the telephone line. During this burst, the adaptive hybrid in the unit measures
the signal reflected from the phone line and adapts the RTU-292C to the impedance of the phone
line, minimizing the reflected signal. This achieves a broadband hybrid balance on the reactive
phone line. This is simply not possible with any type of conventional active or passive hybrid.
Not only is a deep, broadband null provided, but also the action is completely automatic. The
unit will continuously adapt to changing line conditions, making operation insensitive to line
impedance changes.
In the Automated Operations mode, the RTU-292C combines the unique features of its adaptive
DSP hybrid with fully unmanned auto-dial/auto-answer capability. In its standard configuration,
the unit uses tone prompts to signal the remote user of the operations that must be performed to
control the unmanned radio station. The addition of a Voice Prompt Option supplies a large
number of spoken prompts to simplify control. The Local Phone Option allows a standard
Содержание RTU-292C
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