Telex ur-700 User Manual

®

Telex

Operating Instructions

UR-700

GENERAL INFORMATION

The Telex Model UR-700 Receiver and associated Transmitters is a
full diversity system operating within the frequency range of 690 to
725 MHz on specific pre-set frequencies. Systems consisting of the
UR-700 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.

Posi Phase Diversity

The UR-700 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 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.

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Displays

1. A 5 segment LED light array for AF that aids in setting microphone
gains and monitoring receiver microphone and line level outputs.
Light numbers 4 and 5 have a Peak Hold feature.

2. A 1 segment LED light for RF that aids in checking the transmitter
and monitoring for the possibility of initial interference.

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

Audio Outputs

An XLR type connector and 1/4" phone jack are located on the rear
panel providing either line level or microphone level audio output.
The line output level is adjustable with a screwdriver accessible
potentiometer.

Power

The UR-700 will operate from the supplied AC adapter or any
nominal 12-15 volt AC/DC 300 mA supply.

Audio

The UR-700 audio circuitry is designed to complement the transmit­ter audio. A compandor circuit is utilized to enhance the dynamic
range.

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UR-700 Receiver

Specifications

Frequency Range. . . . . . . . . . . . . . . . . . . . . . . 690-725 MHz

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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Amplitude

Audio Output . . . . Line Level: 0.775V RMS/100k load (MAX.)

Mic Level: -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.

FCC I.D. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B5DR307

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Model HT-700 Transmitter

Specifications

Power Output (Terminated). . . . . . . . . . . . . . . . . . . . 10 mW,

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

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

50 us pre-emphasis.

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

Microphone. . . . . . . . . . . . . . . . . . . . . . Dynamic or Electret

DC Power . . . . . . . . . . . . . . . . . . . . 9 volt Alkaline Batteries

Battery Life. . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 to 12 Hours

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

Industry Canada, RSS123

FCC I.D. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B5DH208A

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Model WT-700 Transmitter

Specifications

Power Output (Terminated). . . . . . . . . . . . . . . . . . . . . 10 mW

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

Microphone Sensitivity. . . . . . . . . . 7.8 mV for full deviation

DC Power . . . . . . . . . . . . . . . . . . . . 9 volt Alkaline Batteries

Battery Life. . . . . . . . . . . . . . . . . . . . . . . . . . . 8 to 12 Hours

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

Industry Canada, RSS123

FCC I.D. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B5DB108A

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Figure 1

Front Panel

Power Switch: When turned on, one of the diversity lights will

illuminate.

RF Display: A 1-segment LED Display indicates the presence of the
signal from the transmitter.

Diversity Display:

AF Display: A 5-segment 3 color LED Display indicates the relative

modulation of the microphone.

Squelch: Adjustable for maximum range or minimum interference.

LED’s indicate diversity operation.

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