Lectrosonics UCR401 User Manual download pdf (Page 7)

UHF Digital Hybrid Wireless

Receiver

Rio Rancho, NM

The UCR401 is a portable, high performance, triple-

conversion, frequency synthesized, UHF receiver fully

compatible with all Lectrosonics 400 Series transmit-

ters, Lectrosonics wideband UHF analog systems. DSP

compatibility modes also provide compatibility with

some other transmitter brands. The RF performance is

extremely stable over a very wide temperature range,

making the UCR401 perfectly suited to the rough

environmental conditions found in ﬁeld production. The

combination of digital audio with analog RF produces

superb audio quality and extended operating range.

The UCR401 front panel features a menu-driven LCD

interface and three control buttons to conveniently view

and alter user settings. The main LCD window simulta-

neously displays the pilot tone indicator, phase diversity

activity, RF level, audio level, battery status for both

transmitter and receiver. It is also possible to bypass

the pilot tone squelch from the main display window for

diagnostic purposes. Other windows display operating

frequency, audio output level, battery voltage and test

tone status.

A built-in spectrum analyzer scans across the tuning

range of the receiver to locate RF signals in the vicinity

and ﬁnd clear operating frequencies.

Diversity Reception

Microprocessor controlled antenna phase combining

keeps the receiver small, with low power consumption,

yet it is still able to deal effectively with multi-path drop-

outs. SmartDiversity™ analyzes both the incoming RF

level and the rate of change in RF level to determine the

optimum timing for phase switching, and the optimum

antenna phase. This adaptive technique operates over

a wide range of RF levels to anticipate dropouts before

they occur. The system also employs “opportunistic

switching” to analyze and then latch the phase in the

best position during brief squelch activity.

RF Front-End and Mixer

The UCR401 is frequency agile and can be set to

operate on any one of 256 frequencies within its tuning

range. To signiﬁcantly reduce unwanted interference

and intermodulation problems, the UCR401’s front-end

is tuned to the desired frequency band and rejects or

“tunes out” unwanted out-of-band signals. Two tuned

HI-Q ceramic transmission line resonators prior to a low

noise, high current RF ampliﬁer provide good selectiv-

ity. A LC bandpass ﬁlter after the RF ampliﬁer provides

added insurance against strong RF interference, and

the ﬁrst mixer has a very high third order intercept point.

The overall design ensures stability, selectivity and pre-

cise gain in order to handle strong RF signals without

input overload.

Microcontroller, PLL and VCO Circuits

The 8-bit microprocessor is truly the “heart” of the

UCR401 receiver. It monitors user command inputs

from the front panel control buttons and numerous other

internal signals such as RF level, audio levels, pilot tone

levels and external/internal power voltages. Outputs

from the microcontroller drive the LCD display and

backlight, control the squelch and audio output attenu-

ator, and operate the front-end tuning, the PLL/VCO

circuits and the antenna phase switch. The UCR401

design and the advanced technology of the micropro-

cessor control arguably set a new standard in wireless

microphone development.

General Technical Description

2 (HI)

1 (COMMON)

3 (LO)

LCD

Display

Panel

PILOT TONE

DETECT

FILTER

DIGITAL SIGNAL

PROCESSOR

Attenuation

CERAMIC

FILTER

2ND

MIXER

10.7 MHZ

SAW

FILTER

244 MHz

IF AMP

A-D

CONVERTER

D-A

CONVERTER

AMP

2nd

VCO

XLR

OUT

HI-LEVEL

MIXER

RF MODULE

3RD MIXER

AND

IF AMP

50KHz

LP FILTER

XTAL

CONTROLLED

3rd

OSCILLATOR

SAW

FILTER

244 MHz

IF AMP

COUNTING

DETECTOR

AUDIO

AMP

UCR401

BLOCK DIAGRAM

ANTENNA

COMBINING

FILTER

E PROM

1st

VCO

Smart Diversity

FILTER

PLL

SYNTHESIZER

Filter

Output

Level

Adjust

Digital

Attenuator

1 2 3 4 5 6 7 8 9 10 11 12 ... 27 28

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