Introduction - Lectronics VR Field Reference Manual

Introduction

Lectrosonics Digital Hybrid Wireless
novative technology to combine the new advantages of
digital audio with the classic advantages of analog RF
transmission. A proprietary algorithm encodes the digi-
tal audio information into an analog format which can
be transmitted in a robust manner over an analog FM
wireless link. The receiver employs the latest filters, RF
amplifiers, mixers and detector to capture the encoded
signal and a DSP (Digital Signal Processor) recovers
the original digital audio.
This digital/analog hybrid technique has some very
beneficial properties. Because the information being
transmitted is digitally encoded, immunity to noise is
much higher than a compandor can offer, and, since the
encoded audio is sent in analog format, spectral and
power efficiency and operating range are not compro-
mised.
The VR Field System introduces a new flexibility to
Digital Hybrid Wireless
operates with all Digital Hybrid Wireless
and a variety of analog transmitters. It consists of a VR
Field Receiver Master (VRF) that includes an antenna
multicoupler, computer communications interface,
microprocessor, digital signal processor (DSP), A-D and
D-A converters and audio output circuits, plus mechani-
cal rack mounting for up to six receiver modules.
VRField Functional Block Diagram
Rio Rancho, NM
systems use in-
™
design. The modular design
™
transmitters,
™
See.VRS.and.VRT.Functional.Block.Diagrams
Modular Digital Hybrid Wireless™ Receiver
The system can be setup and operated either through
front panel controls and display, or via rear panel USB
or RS232 ports connected to a Windows
Vista based computer system and VRpanel, which is
part of the LecNet2 software package. (See VR Field
™
Installation Guide, or VRpanel Help.)
VR Field
Each VR Field spans two frequency blocks and sup-
ports from one to six receiver modules. (See Specifica-
tions.) System setup and control is handled by the VRF
with the receiver modules handling frequency reception,
conversion and signal detection.
Antenna Multicoupler
There are two independent antenna multicouplers. One
supports input from the rear panel Antenna A BNC
jack and the other supports input from the rear panel
Antenna B BNC jack.
The individual antenna inputs pass through a 50 MHz
bandpass filter centered on the VRM's assigned fre-
quency block range prior to entering the associated
multicoupler. Each of the multicouplers includes a high
intercept amplifier whose output feeds a seven-way
splitter. Six of the splitter's outputs are presented to the
respective Ant A or Ant B tabs on each of the receiver
module connectors. A seventh output is fed to a rear
Antenna (A or B) OUT connector for use by other VR
Field Receiver Systems.
2000, XP or
™