UHF and VHF Rack Mount Multi Channel Systems OPERATING INSTRUCTIONS and trouble-shooting guide RDM4, SDM4, SDM4D UMC190, UMC195, UMC195D LECTROSONICS, INC. Rio Rancho, NM www.lectrosonics.
UHF and VHF INTRODUCTION The RDM4, SDM4, SDM4D, UMC190, UMC195 and UMC195D systems are high quality, multi-channel wireless microphone systems designed for sound stage, studio, and theater applications. Multi-channel problems such as interaction of receivers, intermodulation and desensitization, etc. have been eliminated through creative engineering and superior design.
Rack Mount Multi-Channel Systems GENERAL TECHNICAL DESCRIPTION The Multi-Channel Wireless Systems consist of two sub-systems; the frame which contains the receivers and the receiver mounting hardware, and the RF/power distribution module. The RF/power distribution module is the heart of the Multi-Channel Wireless System. Selective filtering in the front end of the RF section attenuates out-of-band RF signals preventing intermodulation and front end overload.
UHF and VHF ASSEMBLY and INSTALLATION Assembly of the unit consists of installing the receivers into the frame and connecting the antenna and power leads to each receiver. This is only necessary if the unit was purchased without any receivers. If the unit is purchased with receivers, they are installed at the factory before shipment. IMPORTANT - The receivers installed in the unit must fall between the frequencies indicated on the SERIAL/FREQUENCY label.
Rack Mount Multi-Channel Systems FRONT PANEL DESCRIPTION The front panel contains only one control - the Power switch. Many different receivers can be mounted within the frame. Please refer to the separate receiver manual for a description of the controls and features of each individual receiver. Multi Channel System Front View (UMC190 with UR190 receivers shown) REAR PANEL DESCRIPTION RF/POWER DISTRIBUTION MODULE SERIAL/FREQUENCY LABEL This label indicates the serial number of the DM4 module.
UHF and VHF TROUBLESHOOTING SYMPTOM POSSIBLE CAUSE NO POWER LEDs OR AUDIO 1) Power switch in the OFF position. Switch to ON. POWER AND MODULATION LEDs ON, BUT NO AUDIO 1) No audio connection to recorder or mixer. Check connections. POWER LEDs ON, NO MODULATION LEDs 1) Transmitters not on or in mute position. Check transmitters. 2) Transmitters have dead batteries, check batteries. POOR SIGNAL/NOISE OR DROPOUTS 1) Antenna leads not connected. Check antenna(s).
Rack Mount Multi-Channel Systems ANTENNA USE AND PLACEMENT Position the antennas so that they are not within 3 or 4 feet of large metal surfaces. If this is not possible, try to position the antennas so that they are as far away from the metal surface as is practical. It is also good to position the receiver so that there is a direct “line of sight” between the transmitter and the receiver antenna.
UHF and VHF SPECIFICATIONS RF Gain: 0.5 to 1.5dB Bandwidth VHF: Factory tunable to any 4 MHz band from 150 to 216MHz. Specified at time of order. Factory tunable to any 18MHz band from 470 to 608MHz. Specified at time of order. UHF: RF Outputs Standard: Diversity: Isolation: Four outputs, 50 Ohm, BNC Eight outputs, 50 Ohm, BNC 25dB min, any output to any output Any output can be open, shorted, or terminated without affecting other outputs.
Rack Mount Multi-Channel Systems 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 LIMITED YEARWARRANTY 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.
