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The Linemaster is a compact, portable line-monitoring device used to
identify DTMF (touch-tone) and pulse(rotary) dialed digits. In addition, the
Linemaster provides an enhanced Digital dB Meter, a 1004Hz Tone
Generator, a high quality Audio Monitor and a built-in 600 Ohm load.
As with the The PHD Telecommunicator, the Linemaster, possesses
Ziad's Exclusive Dialed Digit Display/Analyzing technology, displayed on
a large, easy-to-read 32 character (2 rows by 16 characters) Liquid Crystal
Display.
The built-in Digital dB Meter has an effective range of -40 dBm to +6 dBm, in
0.5 dBm steps.
The switchable Tone Generator generates a 1004.1 Hz tone at 0.0 dBm when
transmitted across the 600 Ohm load.
The Enhanced Audio Monitor provides clean, clear audio reproduction with an
adjustable volume control.
The switchable 600 Ohm load provides the means of making highly accurate dBm
readings with the Digital dB Meter, and also terminating a line or trunk
providing detection of live pairs.
The unit is housed in a high-impact ABS plastic case and weighs 16 ounces. It
measures 7" x 3.9" x 1.4" and comes in its own double-walled foam -lined
carrying case. Included with each unit are: four foot test leads with
engineering-style alligator clips (color coded: red & green), and four AA
alkakine batteries
Product Overview :
The Linemaster is a compact, portable line-monitoring device used to identify
DTMF (touch-tone) and pulse(rotary) dialed digits. In addition, the Linemaster
provides an enhanced Digital dB Meter, a 1004Hz Tone Generator, a high quality
Audio Monitor and a built-in 600 Ohm load.
The Linemaster, possesses Ziad's Exclusive Dialed Digit Display/Analyzing
technology, displayed on a large, easy-to-read 32 character (2 rows by 16
characters) Liquid Crystal Display.
The built-in Digital dB Meter has an effective range of -40 dBm to +6 dBm, in
0.5 dBm steps.
The switchable Tone Generator generates a 1004.1 Hz tone at 0.0 dBm when
transmitted across the 600 Ohm load.
The Enhanced Audio Monitor provides clean, clear audio reproduction with an
adjustable volume control.
The switchable 600 Ohm load provides the means of making highly accurate dBm
readings with the Digital dB Meter, and also terminating a line or trunk
providing detection of live pairs.
The unit is housed in a high-impact ABS plastic case and weighs 16 ounces. It
measures 7" x 3.9" x 1.4" and comes in its own double-walled foam -lined
carrying case. Included with each unit are: four foot test leads with
engineering-style alligator clips (color coded: red & green), and four AA
alkakine batteries.
Features:
An amplifier/speaker with three distinct audio levels provides hands-free
listening/monitoring. The speaker is powered by an internal energy
supply. If there is sufficient loop current, the energy supply is automatically
recharged when the test instrument is connected to a line and the instrument is
in the talk mode. During amplifier/speaker operation, an earpiece receiver
remains enabled. Amplifier/speaker operation is stopped or prevented if the
automatically, continually monitored voltage of the internal energy supply is
too low.
A microprocessor provides additional features which are controlled by
dual-function keys on a keypad. The microprocessor permits operational
variations, such as speed of dialing and percentage of break in pulse dialing
and frequency in tone dialing, to be made.
A repertory dialer will store ten 27-digit numbers with dial modes (tone or
pulse). A credit card number and a selectable pause time can be stored along
with the number to be called. The last number called can be automatically
redialed in either tone or pulse mode.
A talk/monitor switch permits talking and monitoring on a connected line.
A tone/pulse/out switch selects either DTMF (Dual Tone Multi-Frequency) or DP
(dc Dial Pulse) pulsing. A third position of the switch disconnects
non-essential circuits to extend the range of the set for listening/talking
only.
A push-button mute switch allows the user to cut off the transmitter to
improve reception in noisy locations The call will remain muted as long as the
mute switch is depressed. The switch also prevents the called person from
hearing the caller's private conversation with someone nearby.
A tone ringer circuit provides an audible ringing signal when the set is in
the monitor mode.
A ground start switch provides for originating calls when a ground start
condition is required.
A spring-loaded belt hook provides a secure connection to a belt loop or "D"
ring for a convenient way to carry or store the test set. The belt hook is used
as a reference ground path for the optional ground start function.
In the monitor mode, line voltage can be measured.
In the talk mode, loop current can be measured without changing connections
of the test instrument. If the loop current exceeds a predetermined magnitude, a
"crow-bar" circuit including a positive temperature coefficient resettable fuse
effectively open-circuits to protect the instrument. Over-voltage protection is
also provided.
Two light-emitting diodes are used to indicate polarity, loop current, line
voltage, program version number and internal energy supply
voltage.
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