UDR200C RATIO DIVERSITY UHF RECEIVER OPERATING INSTRUCTIONS and troubleshooting guide LECTROSONICS, INC. Rio Rancho, NM www.lectrosonics.
Table of Contents GENERAL TECHNICAL DESCRIPTION ............................................................... 4 FRONT PANEL CONTROLS AND FUNCTIONS ................................................... 7 REAR PANEL CONTROLS AND FUNCTIONS ..................................................... 8 INSTALLATION AND OPERATING INSTRUCTIONS ............................................ 9 USING THE LED INFORMATION DISPLAY ....................................................... 10 UDRPANEL SOFTWARE .....................
GENERAL TECHNICAL DESCRIPTION The UDR200C consists of two high performance, triple-conversion receivers operating simultaneously. The audio outputs of the receivers are blended in a ratio controlled by the comparative RF levels in the receivers. The multistage RF front end is a unique design that is tuned by a microprocessor to the selected frequency.
Wireless Diversity Receiver DOUBLE BALANCED DIODE MIXERS In all wireless receivers, a mixer is used to convert the carrier frequency to the IF frequency where most of the filtering and gain in the receiver takes place. After doing all the right things in the front end, it would be a shame to waste the performance with a second rate mixer. In other designs that is exactly what happens since mediocre mixers cause more intermodulation problems than mediocre front ends.
RF ONLY NOISE FILTER A small switch on the rear of the receiver will allow the noise filter to be set for RF ONLY. In this mode the filter is held out of the audio frequency range unless the RF level drops to very low levels. At weak RF levels, the filter operates in the TRI MODE state until the RF level rises back to acceptable levels. This has the desirable effect of softening dropouts.
Wireless Diversity Receiver FRONT PANEL CONTROLS AND FUNCTIONS TRANSMITTER AUDIO LEVEL PILOT INDICATOR The modulation (audio level) of the incoming signal is indicated by a fast responding LED strip. The strip is calibrated in 6dB steps over an expanded scale (54dB) which provides an extremely accurate visual “picture” of the signal dynamics, even at a distance away from the receiver.
REAR PANEL CONTROLS AND FUNCTIONS AUDIO OUTPUT ANTENNA JACKS A calibrated control on the rear panel adjusts the output level in 5 dB steps, referenced in dBu. This control knob adjusts the absolute output level at the XLR connector. The AUDIO OUTPUT level control is located after the output transformer. This allows the signal to noise ratio to remain constant regardless of the setting of the control. As the audio level is reduced, the noise is also reduced maintaining the same ratio.
Wireless Diversity Receiver INSTALLATION AND OPERATING INSTRUCTIONS 1) Locate a suitable operating location where the receiver will not be subjected to extreme temperature variations and possible bumps and drops. Try to route all wiring so it will not cross walkways or isles. 6) Turn the unit on with the front panel POWER switch and check to see that the PILOT indicator is blinking indicating that the pilot tone is not being received (be sure the transmitter is turned off.) 2) Connect the power.
USING THE LED INFORMATION DISPLAY A 1uV 2 5 10 25 50 100 250 500 1mV RF LEVEL 6 6 8 . 1 0 0 1uV 2 5 10 8 . 7 V RF LEVEL 25 50 100 250 500 1mV OPTI BLEND -48 -42 -36 -30 -24 -18 -12 -6 0 LIM TX AUDIO LEVEL dB FREQ SELECT 1 9 DIVERSITY OPTI BLEND A B B MONITOR MODE POWER MENU The UDR200C has two power up options and four operating modes which control all aspects of the receiver operation. OPERATING MODES The UDR200C has four display pages, or operating modes.
Wireless Diversity Receiver Frequency and Battery Voltage 6 6 8 . 1 0 0 8 . 7 V Active Group and Lock Status 1 9 In this mode, the frequency in MHz is displayed on the left side of the display and the hexadecimal transmitter channel code is displayed on the right. Whenever valid transmitter battery voltage information is available, it is displayed in the center. A stable, moderately strong signal must be maintained for at least 30 seconds in order to get a good battery voltage indication.
UDRPANEL SOFTWARE The UDR series receivers are supplied with a PC software control program called UDRpanel. With UDRpanel is it possible to do things with the receiver that cannot be accomplished from the front panel. These special capabilities include: Startup Window • One-person walk test with audio playback and RF level strip chart. • Spectrum analyzer to find unused frequencies. • Cohesive real-time monitoring of one to more than forty receivers.
Wireless Diversity Receiver Main Window The Pilot indicator is green when a pilot tone is present, red when no pilot tone is present, and yellow when the pilot tone detection feature of the receiver has been bypassed. RF A and RF B give a relative indication of RF signal strength at the two antennas. When the signal is weak, the indicator background changes to yellow, or red for very weak signals.
File Menu Options Window The file menu lets you create, save and load configurations, as well as exit the program. Edit Menu The edit menu lets you make changes to the current configuration. Scan LecNet clears the configuration, scans for attached receivers, and adds any that it finds. Add Receiver manually adds a receiver to the configuration. This is useful if no receivers are currently connected or if a receiver is currently missing but will be reattached later.
Wireless Diversity Receiver was invoked. Receiver Setup Window The Receiver Setup window is invoked by double-clicking or right-clicking on a receiver pane in the Main window. It permits detailed configuration, monitoring and control of an individual receiver. The Meters and Status frame contains large RF and Audio meters which behave the same way as the smaller ones in the panes on the Main window. The Opti indicators indicate diversity status in the same way as the LEDs on the receiver itself.
Receiver Menu The receiver menu lets you change the pilot bypass status or lock status of a receiver. If Pilot Bypass is enabled, the receiver audio is never muted, even when a valid pilot tone is not present. There are three choices for Lock Status: not locked, locked, and hard locked. The lock feature protects the receiver from accidental retuning from the front panel switches when the UDRpanel software is not in use, but it has no effect on operation from UDRpanel.
Wireless Diversity Receiver ANTENNA USE AND PLACEMENT like “hiss” or a “swishing” sound. Moving the transmitter even a few inches will change the sound of the hum or hiss, or eliminate it. A dropout situation may be either better or worse as the crowd fills and/or leaves the room, or when the transmitter or receiver is operated in a different location.
TROUBLESHOOTING POWER SUPPLY AND FUSE Display not lit or dimly lit • AC power cord disconnected. • External power supply disconnected or inadequate. • Main power supply defective. • The External DC power input is protected by an auto-reset polyfuse. Disconnect power and wait about 10 seconds for the fuse to reset. Receiver won’t turn off • This is normal when the unit is being operated from external DC power. PILOT TONE SQUELCH The pilot indicator is the transmitter switch settings display.
Wireless Diversity Receiver SOFTWARE UDRpanel software does not detect any connected receivers. • Be sure receivers are powered on and properly connected. Select default scan limits and check COM port settings in Options window. Check each receiver to make sure all receivers have unique LecNet address settings. UDRpanel detects some receivers but not others. • Select default scan limits in Options window. Check each receiver to make sure all receivers have unique LecNet address settings.
LecNetTM COMPUTER INTERFACE Lectrosonics’ LecNet system is a unique implementation of standard RS-232 serial communications. Since it is compatible with RS-232 serial ports found on all PCs, no extra interface cards are necessary to add computer control to your LecNet equipment. The figure below shows a representation of a LecNet setup. Unlike standard RS-232 equipment, where one serial port connects to only one device, as many as 127 LecNet devices may be simultaneously connected to a single serial port.
Wireless Diversity Receiver LecNet SOFTWARE PROTOCOL Note: This section is for development of custom control applications and is not necessary for general operation of the receiver and the LecNet control software provided by the factory. All LecNet devices use a modification of the typical one-to-one connection between two RS-232 compatible devices. LecNet devices have both an RS-232 transmitter and receiver section.
LECNET COMMANDS Poll Receiver - Retrieves a block of dynamic receiver status information, useful for polling from a control system. Host sends command - 0 (0 hex) Host receives 6 bytes - This is a packet of data reflecting the current status of the receiver. The contents are as follows.
Wireless Diversity Receiver Set Lock Status - Sets the front panel lock status of the receiver. Host sends command - 7 (7 hex) Host sends data byte - 0=hard locked, 1=not locked, 2=locked Get Lock Status - Gets the front panel lock status of the receiver. Host sends command - 8 (8 hex) Host receives data byte - 0=hard locked, 1=not locked, 2=locked Set Channel Group - Selects the active channel group.
SPECIFICATIONS AND FEATURES Operating Frequencies: 537.600 to 865.000 MHz Frequency Adjustment Range: Receiver Type: Frequency Stability: Front end selectivity: 25.5 MHz Triple conversion, superheterodyne, 71MHz, 10.7MHz and 300kHz ±0.002 % >22 dB at ±4 MHz Sensitivity 20 dB Sinad: 60 dB Quieting: Squelch quieting: 0.707 uV (-110 dBm), A weighted 1.
Wireless Diversity Receiver SERVICE AND REPAIR If your system malfunctions, you should attempt to correct or isolate the trouble before concluding that the equipment needs repair. Make sure you have followed the setup procedure and operating instructions.
LIMITEDONE ONE YEAR WARRANTY LIMITED YEAR WARRANTY The equipment is warranted for one year from date of purchase against defects in materials or workmanship provided it was purchased from an authorized dealer. This warranty does not cover equipment which has been abused or damaged by careless handling or shipping. This warranty does not apply to used or demonstrator equipment. Should any defect develop, Lectrosonics, Inc.
