INSTRUCTION MANUAL HM Plug-On Transmitter With Digital Hybrid Wireless® Technology Digital Hybrid Wireless® US Patent 7,225,135 Fill in for your records: Serial Number: Purchase Date: Rio Rancho, NM, USA www.lectrosonics.
HM 2 LECTROSONICS, INC.
Digital Hybrid® Plug-On Transmitter Table of Contents General Technical Description...............................................4 Wideband Design...................................................................4 Digital Hybrid Wireless® Technology......................................4 No Pre-Emphasis/De-Emphasis............................................4 Low Frequency Roll-Off.........................................................4 Input Limiter.....................................................
HM General Technical Description Wideband Design The HM transmitter uses ±75 kHz wide deviation for an excellent signal to noise ratio and wide dynamic range. The DSP controlled input limiter features a wide range dual envelope design which cleanly limits input signal peaks over 30 dB above full modulation. Switching power supplies to provide constant voltages to the transmitter circuits from the beginning (3 Volts) to the end (1.
Digital Hybrid® Plug-On Transmitter Input Limiter A DSP-controlled analog audio limiter is employed before the analog-to-digital (A-D) converter. The limiter has a range of more than 30 dB for excellent overload protection. A dual release envelope makes the limiter acoustically transparent while maintaining low distortion. It can be thought of as two limiters in series, a fast attack and release limiter followed by a slow attack and release limiter.
HM Controls and Functions Input Coupler Modulation LEDs LCD UP Arrow Battery Compartment Modulation LEDs The Modulation LEDs provide a visual indication of the input audio signal level from the microphone. These two bicolor LEDs can glow either red or green to indicate modulation levels. 0 dB in the table below indicates full modulation.
Digital Hybrid® Plug-On Transmitter Battery Installation The HM transmitter is powered by two AA batteries. We recommend using lithium batteries for longest life. Lithium batteries provide over 12 hours of operation at room temperature. Note: Standard zinc-carbon batteries marked “heavy-duty” or “long-lasting” are not adequate. The battery status circuitry is designed for the voltage drop over the life of lithium batteries.
HM Operating Instructions PWR LED Modulation LEDs UP Arrow Automatic Power Restore The firmware will remember the power on/off state and the settings when batteries reach their end of life or are removed. When fresh batteries are installed, the unit will reboot and return to the previous settings without the need to press any buttons. This only works when the unit is fully on and transmitting. It does not work in the Standby Mode.
Digital Hybrid® Plug-On Transmitter LCD Backlight Settings The LCD backlight can be set to turn off after either 5 minutes or 30 seconds or stay on continuously. Hold the UP arrow in while powering up the unit to enter the setup screen. Press the AUDIO button repeatedly to step through the setup items to reach the backlight settings screen. Use the UP or DOWN arrow button to select the desired setting.
HM Audio Screen The Audio Screen is used to adjust input gain and low frequency roll-off, and to turn phantom power on and off. Repeatedly pressing the AUDIO button selects the setting. Press and hold the AUDIO button and use the UP and DOWN arrows to adjust the value. Adjusting the Input Gain The control panel Modulation LEDs indicate the modulation level and limiter activity.
Digital Hybrid® Plug-On Transmitter About the Phantom Power Supply Three phantom voltages are selectable from the control panel. The voltages are: • 5 Volts for lavaliere microphones, • 15 Volts for some professional mics requiring high current and for many common stage mics that will operate over a wide phantom Voltage range of 12 to 48 Volts. With the proper adapter, this position can also be used with T power microphones. See our web site for details on finding or making the proper adapter.
HM Using the Polarity-Reversing Barrel Adapter P/N 21750 Polarity Reversing Barrel Adapter Earthworks M30 This polarity adapter may be needed if you are experiencing noise, low output or distortion with measurement microphones such as the Earthworks model M30 or Rode model NTG3. Insert the adapter between the transmitter and microphone to alleviate the problems listed above. 12 Barrel Adapter LECTROSONICS, INC.
Digital Hybrid® Plug-On Transmitter Accessories PHTRAN3 MCA-TPOWER Replacement leather pouch with rotating belt clip and snap closure. Included with transmitter at purchase. This cable adapter is to be used with the UH200D, UH400 and HM plug-on transmitters with T-powered microphones. It will protect a T-power mic against the 48V phantom power setting in the transmitter while allowing normal operation. The transmitter should be set to the 15V position for best operation and minimum current drain.
HM Troubleshooting Before going through the following chart, be sure that you have good batteries in the transmitter. It is important that you follow these steps in the sequence listed. SYMPTOM POSSIBLE CAUSE TRANSMITTER PWR LED OFF 1) 2) AUDIO LEVEL LEDs NOT LIGHTING 1) 2) 3) 4) RECEIVER RF INDICATOR OFF Batteries are inserted backwards or dead. Transmitter not powered up. (See Operating Instructions, Power UP and Boot Sequence.) Gain control set to minimum.
Digital Hybrid® Plug-On Transmitter SYMPTOM POSSIBLE CAUSE HISS AND NOISE -- AUDIBLE DROPOUTS 1) 2) 3) 4) Transmitter gain (audio level) far too low. Receiver antenna missing or obstructed. Operating range too great. Signal interference. Turn off transmitter. If receiver’s signal strength indicator does not drop to nearly zero, this indicates an interfering signal may be the problem. Use a clear operating frequency.
HM Specifications and Features Operating frequencies: Block 470 470.100 - 495.600 Block 19 486.400 - 511.900 Block 20 512.000 - 537.500 Block 21 537.600 - 563.100 Block 22 563.200 - 588.700 Block 23 588.800 - 607.900 and 614.100 - 614.300 Block 24 614.400 - 639.900 Block 25 640.000 - 665.500 Block 26 665.600 - 691.100 (Frequency usage varies by country) Frequency range: 256 frequencies in 100 kHz steps for one 25.
Digital Hybrid® Plug-On Transmitter 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. Check the interconnecting cables and then go through the Troubleshooting section in this manual.
LIMITED ONE 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. will, at our option, repair or replace any defective parts without charge for either parts or labor.
