Micron 700 Series Bedienungsanleitung
TX700.148
TX700.132
TX700.64
TX700.32
700 SERIES-MULTI-FREQUENCY
POCKET TRANSMITTER
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INSTRUCTION MANUAL
Covers the following models:
700 SERIES : TX700.148, TX700.132,
TX700.64, TX700.32,
Part No IMTX700-1.1
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Contents
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General description .............................................................. 7
Main Features ....................................................................... 8
Unique Micron Companding System..................................... 11
Control Panel ....................................................................... 12
Switch panel ........................................................................ 13
Transmitter Powering ........................................................... 16
Battery Test and Transmitted Warning................................. 17
Automatic Level Control System .......................................... 18
Operating Instructions .......................................................... 19
How to get the best from the MICRON ................................ 21
Interference .......................................................................... 23
Technical Data ..................................................................... 25
Antenna Data ....................................................................... 28
Transmitter Input Connectors ............................................... 29
Transmitter Cables .............................................................. 30
Cable Ended Microphones .................................................. 36
Distributors ......................................................................Appendix
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General Description
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The Micron TX700’s sophisticated design is based around a low-noise VCO, with digitally controlled PLL circuit,
producing the highest possible quality of transmitted signal. The lightweight, yet rugged aluminium extrusion case
provides strength and durability, and is designed to withstand the heavy demands of location use, while being
comfortable to wear - ideal for situations where concealment is important. The unique battery compartment design
enables fast and easy battery replacement.
Adjustment of the audio level is straightforward, with the modulation level control easily accessible through the
TX700’s top panel, where peak-reading LEDs (-10 and 0dB) indicate the audio level, allowing repeatable levels to
be set. The TX700 includes a soft audio limiting circuit, with the threshold user-adjustable to give a wide range of
operation from fully automatic to no limiting action. The advanced design enables the limiter to be used as an
automatic level control, without the pumping effect usually associated with audio AGC, and it can also be used as a
‘distortionless’ emergency limiter to prevent over-modulation.
Additional front-end protection is provided by a bass-cut switch, which may be used to reduce wind noise and
counteract close-microphone effects. The use of dedicated audio input cables enables the transmitter to accept line
and mic level signals, and to power a wide variety of microphone types. The TX700 is equipped with a battery
condition indicator on the top panel, and also transmits an inaudible ‘low battery voltage’ warning signal, which
activates a visual indication on the matching Micron receiver.
The MICRON POCKET TRANSMITTER is available in 4 different models: -
Model Number: Number of Channels: Frequency Range:
TX700.148 100 470-865MHz
TX700.132 100 470-865MHz
TX700.64 64 470-865MHz
TX700.32 32 470-865MHz
This instruction manual can be used for all the above models, detail differences will be indicated where applicable
Main Features
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Switchable Frequency
Operating frequencies can be selected from two BCD coded switches located in the switch panel label.
100 positions – TX700.148
100 positions – TX700.132
64 positions – TX700.64
32 positions – TX700.32
Unique Micron Companding System
The MICRON 700 series feature a double ended system which first compresses the dynamic range of the signal in
the transmitter, and then expands it again in the receiver.
Automatic Gain Control Option
The design of the limiter in the MICRON transmitter enables it to be used as an automatic gain control system
without the pumping effect associated with audio A.G.C. systems. It can also be used as a 'distortionless' limiter to
prevent distortion due to over modulation.
'Overload proof' audio input amplifier
The variable gain microphone amplifier has a gain control range of 40dB. Distortion is less than 0.3% over the
whole of this range.
Main Features
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L.E.D. Volume Indicator
One problem associated with radio microphones is the setting of the modulation level. As with tape recording, too
low a setting results in a poor signal to noise ratio, too high a setting causes distortion. A common practice is to
adjust the audio gain of the transmitter until distortion is heard and then 'back off a bit'. The MICRON transmitter is
fitted with a simple L.E.D. volume indicator (‘0’ and ‘-10’) to allow the modulation level to be set quickly and
accurately, without having to monitor the receiver output.
Multiple Input microphone socket
The 6 way Lemo connector provides:
1. A high sensitivity input for dynamic and condenser microphones.
2. Direct powering connection for electret microphones (+ve and –ve bias).
3. Powering for 12V 'T' powered condenser microphones.
4. Powering for 12V 'Phantom' powered condenser microphones.
5. Powering for 48V 'Phantom' powered condenser microphones with Micron P48 in-line dc booster.
6. Line input capability.
7. External powering for transmitter.
Main Features
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Automatic Warning of Transmitter battery failure
The battery warning system transmits an inaudible signal when the transmitter batteries are reaching the end of
their life, causing LED's on the receiver to flash at a slow but steady rate. This gives the operator a warning period
before the batteries must be changed. By keeping a continuous check on the transmitter batteries, the warning
system provides protection against batteries, which appear to be fresh but fail unexpectedly after a short period of
use.
Ruggedness
The lightweight aluminum extrusion transmitter case is strong by virtue of its shape. The shell strength is reinforced
by the front and back panel and electronic circuitry is separated by the battery compartment.
Electronic Reliability
Exhaustive test procedures account for roughly half the manufacturing cost of a MICRON. The transmitters and
receivers are constructed from pre-aligned electronic modules. The highest risk of component failure is usually
early in its working life. The object of the lengthy test routine is to force the potential faults to occur before the unit
leaves the factory.
Every module is tested and heat cycled. If the modules perform correctly, they are assembled into complete
transmitters and receivers and given a 100-hour burn in, certain critical parts are given a further 100-hour reliability
test. After alignment, every transmitter and receiver is checked for correct performance at 0oC, 25oC and 50oC,
after a further complete test a MICRON is passed to leave the factory.
Dieses Handbuch passt für folgende Modelle
4
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