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Lectrosonics UR190 Operating Instructions And Troubleshooting Manual

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UR190
UHF COMPACT RECEIVER
OPERATING INSTRUCTIONS
and trouble-shooting guide
LECTROSONICS, INC.
Rio Rancho, NM

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Summary of Contents for Lectrosonics UR190

  • Page 1 UR190 UHF COMPACT RECEIVER OPERATING INSTRUCTIONS and trouble-shooting guide LECTROSONICS, INC. Rio Rancho, NM...

  • Page 2: Table Of Contents

    TROUBLESHOOTING ........UR190 REPLACEMENT PARTS AND ACCESSORIES ....

  • Page 3: General Technical Description

    Level Control Figure 1 - UR190 Receiver Block Diagram The UR190 receiver is comprised of six major functional subsystems: the RF front-end amplifier, the double balanced mixer/local oscillator, the first IF filter, the second IF filter and audio demodulator, the compandor, and the balanced microphone level output circuit.
  • Page 4 The Dual Band Compandor is driven by a multiple pole active low-pass filter. The filter ensures that supersonic noise will not cause the compandor to increase gain incorrectly. This filter also drives the -20dB and 0dB modulation LEDs. Traditionally, compandors have been a source of distortion in wireless microphone systems. The basic problem with conventional systems is that the attack and decay times are always a compromise.

  • Page 5: Controls And Functions

    CONTROLS AND FUNCTIONS RECEIVER FRONT PANEL MODULATION LEDs Indicate the modulation (audio level) of the incoming signal, and can be used for proper adjustment of the transmitter’s "MIC LEVEL" or "GAIN". The -20 LED glows when the transmitter modulation is at a high enough level to produce a good audio signal-to-noise ratio.
  • Page 6 ANTENNA JACK Connects to any 50 ohm antenna with a BNC type connector (a flexible "rubber duckie" antenna is supplied). The A-185 Coax remote type antenna may also be used. 50 dBV MODULATION OUTPUT POWER Figure 2 - UR190 Front Panel...

  • Page 7: Receiver Rear Panel

    Connects to the supplied CH-12 AC adapter for powering the receiver from a 110/120V AC source. The receiver may also be powered from external 12 volt DC sources using the correct plug (Switchcraft S-760 power plug). A diode bridge is used in the external power input, so that the UR190 will operate properly from either polarity.

  • Page 8: Antenna Use And Placement

    ANTENNA USE AND PLACEMENT Connect the antenna to the front panel jack. Position the antenna so that it is not within 3 or 4 feet of large metal surfaces. If this is not possible, try to position the antenna so that it is as far away from the metal surface as is practical.

  • Page 9: Operating Instructions

    If the output is too low, you may hear steady noise (hiss) along with the audio. The UR190 output was designed to drive microphone level inputs. The output signal level ranges from -50dBV with the output control fully counter clockwise to -20dBV with the output control fully clockwise when the transmitter signal is at full modulation.

  • Page 10: Troubleshooting

    UHF Flexible whip receiver antenna, right angle PS-12 Power cable, Hi-rose 7-4 pin (Betacam) to DC power supply (UR190) PS-212 Same as PS-12 except with dual plugs to power 2 UR190 receivers UMC-190 Rackmount, space for four receivers, with RF dstribution amplifier...

  • Page 11: Service And Repair

    There are no adjustments inside that will make a malfunctioning unit start working. LECTROSONICS service department is equipped and staffed to quickly repair your equipment. In-warranty repairs are made at no charge in accordance with the terms of the warranty. Out of warranty repairs are charged at a modest flat rate plus parts and shipping.

  • Page 12: Specifications And Features

    SPECIFICATIONS AND FEATURES Operating Frequencies: 470MHz to 608MHz, crystal controlled Sensitivity: Better than 0.35 uV for 20dB SINAD; 1.5 uV for 50dB S/N ratio Signal/Noise Ratio: 106dB A-weighted Squelch Quieting: greater than 106dB AM Rejection: -60dB (10uV to 0.1 Volts) ±15kHz Modulation Acceptance: Image and Spurious Rejection:...

  • Page 13: Limited One Year Warranty

    This warranty gives you specific legal rights. You may have additional legal rights which vary from state to state. LECTROSONICS, INC. 581 LASER ROAD RIO RANCHO, NM 87124 USA July 6, 1999...

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