Lectrosonics SMV/941 handleiding
Handleiding
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Super-Minature Belt Pack Transmitter
Rio Rancho, NM
5
Signal Encoding and Pilot Tone
In addition to controlling the limiter, the DSP also en-
codes the digitized audio from the A/D converter and
adds an ultrasonic pilot tone to control the squelch in the
receiver. A pilot tone squelch system provides a reliable
method of keeping a receiver output muted (audio mute)
even in the presence of signicant interference. When the
system is operating in the Nu Hybrid mode (available in
US transmitters), a dierent pilot tone frequency is gener-
ated for each carrier frequency to prevent inadvertent
squelch problems in multi-channel sytems.
Microprocessor Control
A microprocessor monitors user command inputs from
the control panel buttons and numerous other internal
signals. It works intimately with the DSP to ensure the
audio is encoded according to the selected Compatibil-
ity Mode and that the correct pilot tone is added to the
encoded signal.
Control Panel
The control panel includes four membrane switches and an
LCD screen to adjust the operational settings. Multi-color
LEDs are used to indicate audio signal levels for accurate
gain adjustment and for battery status.
Variable Power Output
This advanced feature allows the operator to optimize
the transmitter for maximum battery life, or for maximum
operating range. Power output is selected using the LCD
in a setup mode while the RF output of the transmitter is
turned o.
Battery Options and Operating Time
Switching power supplies convert regulated battery volt-
ages to operate various circuit stages with maximum
eciency.
The rmware “remembers” the power status when a
battery fails, so the transmitter will be turned on auto-
matically when the battery is replaced and the previous
settings will be enabled.
Circulator/Isolator
The RF output circuit includes a one way circulator/iso-
lator using a magnetically polarized ferrite. This device
greatly reduces RF intermodulation produced when
multiple transmitters are used in close proximity to one
another (several feet apart). The isolator also provides
additional RF output stage protection against static
shock.
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Productinformatie
| Merk | Lectrosonics |
| Model | SMV/941 |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 5751 MB |
