Telex USR-100 User Manual

Telex

Operating Instructions

USR-100

Table of Contents

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

USR-100 Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Frequency Agility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Channel Lockout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Dual Squelch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Posi Phase Diversity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Antennas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Computer Controlled Channels. . . . . . . . . . . . . . . . . . . . . . . . 2

Displays. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Audio Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Audio. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

USR-100 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

SH-100 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

LT-100. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Power Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Channel Select Buttons. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Channel Lockout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Diversity Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

AF Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

RF Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Antenna Jacks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Audio Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Audio Adjust. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Audio Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Power Jack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Power Cord Retainer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Receiver Set-up. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

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Table of Contents (continued)

SH-100 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Power Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Battery Test Button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Battery Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Channel Select Switches. . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Microphone Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Transmit Power Switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Set-Up. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

LT-100

Power Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Battery Test Button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Battery Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Microphone Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Channel Select Switches. . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Microphone Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Transmit Power Switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Set-Up. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

System Set-Up. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Antenna Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Antenna Placement for Optimum Range

and Rack Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Bracket Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Antenna Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Installing Rack Mounts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Double Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Accessories and Replacement. . . . . . . . . . . . . . . . . . . . . . . . . . 19

Front Connector Mounting Kit . . . . . . . . . . . . . . . . . . . . . . . 20

FCC Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Customer Service Information . . . . . . . . . . . . . . . . . . . . . . . . . 22

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GENERAL INFORMATION

The Telex Model USR-100 Receiver and associated Transmitters is a
100 Channel, frequency-selectable full diversity system operating within
the frequency range of 668.0 to 746.0 MHz on specific pre-set frequen­cies. Systems consisting of the USR-100 and its companion transmitter
are capable of operating on at least 5 frequencies in a TV channel
simultaneously, sometimes more depending on the individual venue.
Certain frequencies can be combined to form a set of systems compatible
for simultaneous use. Digital frequency control of the USR-100 permits
flexibility within a given area and assures confidence in the equipment
capability.

FEATURES

The USR-100 features a pair of unique UP-UP channel slewing push
buttons that makes channel changing easy. Simply press each button
until the desired digit appears. A 2 digit 7 Segment LED indicates
the Channel. If there is any interference from other wireless users or
a TV station in the area, it is a simple matter to change the USR-100
frequency. The frequency agility of the USR-100 is also very useful
for itinerant users and rental customers.

Prevents channel changes by unauthorized personnel or accident. The
lockout status is unaffected when the unit is turned off or unplugged.
The channel display will flash 4 times when the USR is turned on if
the lockout is enabled. The display will flash rapidly if someone tries
to change the channel when the lockout is enabled.

The USR-100 features not only a Tone Coded Squelch on a little used
tone frequency of 31.250 KHz but also uses RSSI Amplitude
Squelch. In the case where there is an RF carrier or noise interference
on the channel, the squelch will not open because there is no accom
panying tone. The USR-100 must receive the correct tone from the
transmitter and the RF carrier before the squelch will open.

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Posi Phase Diversity

The USR-100 receiver utilizes Telex’s patented Posi Phase auto
diversity circuit. Unlike other types of diversity which receive with
only one antenna at a time, Posi Phase utilizes both antennas at all
times. This results in a stronger signal from the microphone for
cleaner audio and greater range.

If the microphone signal begins to go out of phase (a common cause
of “drop outs” with other types of diversity) the Posi Phase circuit
adjusts the phase angle between the two antennas’ receiving circuits
to prevent phase cancellation. This action is indicated by the 0 and
180 degree diversity lights on the front panel

Antennas

There are two TNC type antenna connectors on the rear panel. These
connectors are superior to the more common BNC connectors, both
electrically and mechanically. TNC connectors are becoming the
standard of the industry due to their heavy use in the Cellular Phone
industry. Quarter wave antennas are supplied for normal use or an
optional antenna accessory kit can be used to rack mount the anten­nas. Optional half wave antennas with coax can be used for remote
installations. Both antennas must be used as both are active at all
times, unlike other types of diversity that only use one antenna at a
time.

Computer Controlled Channels

The VCO (Voltage Controlled Oscillator), which is the heart of any
Phase Locked Loop Receiver, is controlled by an on-board PIC
microprocessor. Each individual USR-100 RF stage tuning element
is also under the direct control of the microprocessor. This directs the
receiver to undergo an “Automatic Self Tune” step each time the
channel is changed. This is unlike many receivers on the market that
simply have “wide band” designs that allow interference to enter the
most sensitive stages of a receiver to cause inter-modulation and
noise. Other items under processor control are the channel selection,
spacing and display, the AF and RF displays and diversity operations.
This marriage of digital precision with real analog sound provides
the user with the best of both technologies.

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Displays

The 7 Segment LED channel display already mentioned (00 to 99).

2. A 5 segment LED light array for AF, that aids in setting micro-

phone gains and monitoring receiver microphone and line level

outputs. Light numbers 4 and 5 have a Peak Hold feature.

3. A 5 segment LED light array for RF, that aids in checking the

transmitter and monitoring for the possibility of initial interfer-

ence.

4. A 2 segment LED array that indicates diversity action and antenna

configuration.

Audio Output

An XLR type connector is located on the rear panel that provides
either line level audio or microphone level audio output, which is
controlled by a slide type switch also located on the rear pane. The
output level is adjustable with a screwdriver accessible potentiometer
located on the rear panel.

Power

The USR-100 will operate from the supplied AC adapter or any
nominal 12-15 volt AC/DC 600 mA supply.

Audio

The USR-100 audio circuitry is designed to complement the trans­mitter audio. A compandor circuit is utilized to enhance the dynamic
range. A slow turn-on circuit prevents the audio output stage from
passing noise spikes present during receiver power up conditions.

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USR-100 Receiver

Specifications

RF Frequency Range. . . . . . . . . . . . . . . 668.0 to 746.0 MHz

Channels . . . . . . 100 (0-99) (within TV Ch. 47/48 & 58/59)

R.F. Stability . . . . . . . . . . . . . . . . . . . . . . . . 0.005% or better

Modulation Type. . . . . . . . . . . . . . . . . FM, 40 KHz nominal

Type. . . . . . . . . . . . . . . . . . Single Conversion, 10.7 MHz I.F.

I.F. Bandwidth. . . . . . . . . . . . . . . . . 230 KHz at -3 db points.

Image Rejection . . . . . . . . . . . . . . . . . . . . . . . 65dB or better

Squelch . . . . . . . . . . . . 31.250 KHz Tone + RSSI Amplitude

Audio Output . . . . . . . . . . . . Level, 0.775V RMS/100k load

-20 dBV, 600 Ohm load

Receiver Sensitivity . . . Less than 0.8 uV for 12 dB SINAD

FCC. . . . . . . . . . . . . . . . . . . . . . . . . . . . Notification, Part 15

Diversity . . . . . . . . . . . . . . Continuous Posi Phase Diversity

Both antennas are fully employed at all times

to maximize signals.

RF Selectivity . . . . . . . . . . . . . Tracked Ceramic Resonators.

Not Broadband.

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Model SH-100 Transmitter

Specifications

Frequency of operation . . . . . . . . . 668.000 to 746.000 MHz.

(Current models operate in 2 frequency ranges.)

668.000 to 679.500 MHz and 734.100 to 745.500 MHz.

Number of Channels . . . . . . . . 100 User Selectable Channels

in each range.

Power Output (Terminated). . . 10 mW, High switch setting,

1.0 mW Low.

Antenna. . . . . . . . . . . . . . . . . . . . . . . . Permanently attached.

Modulation . . . . . . . . . . . . . . . . FM, +/- 40 KHz Deviation,

50 us pre-emphasis.

Frequency Response (System) . . . . . . . . 50 Hz to 15000 Hz

Microphone. . . . . . . . . . Dynamic or Electret, + 5 VDC Bias.

Tone Squelch. . . . . . . . . . . . . . . . . . . . . Full time, 31250 Hz

DC Power . . . . . . . . . . . . . . . . 2 AA Size Alkaline Batteries.

Battery Life. . . . . . . . . 9 Hours, High Power, 12 Hours Low

Low Battery Indicator. . . . Built-in Fuel Gauge, Test Switch

Approvals . . . . . . . . . . . . . . . . . . . . . . . . . . . . FCC, Part 74H

Industry Canada, RSS123

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