INSTRUCTION MANUAL HMa Wideband 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.
HMa 2 LECTROSONICS, INC.
Wideband Digital Hybrid® Plug-On Transmitter Table of Contents Thank you for selecting a Lectrosonics HMa plug-On transmitter.
HMa General Technical Description The HMa 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 (1.7 Volts) of battery life, and an ultra low noise input amplifier for quiet operation.
Wideband Digital Hybrid® Plug-On Transmitter Low Frequency Roll-Off The low frequency roll-off can be set for a 3 dB down point at 35, 50, 70, 100, 120 and 150 Hz to control subsonic and very low frequency audio content in the audio. The actual roll-off frequency will vary slightly depending upon the low frequency response of the microphone. Excessive low frequency content can drive the transmitter into limiting, or in the case of high level sound systems, even cause damage to loudspeaker systems.
HMa 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. Full modulation (0 dB) occurs when the -20 LED first turns red.
Wideband Digital Hybrid® Plug-On Transmitter Battery Installation The transmitter is powered by two AA batteries. Note: Standard zinc-carbon batteries marked “heavy-duty” or “long-lasting” are not adequate. Attaching/Removing a Microphone The spring loaded coupler under the XLR jack maintains a secure fit to the microphone jack with continuous pressure applied by an internal spring.
HMa 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.
Wideband Digital Hybrid® Plug-On Transmitter RF Power Output (Up Button Menu) Pr (RF Power output) may be selected as either 100 or 50. HMa transmitter settings that can be adjusted: • Audio input level (gain) • Operating frequency • Panel Lock/Unlock Selecting the Audio Polarity (Up Button Menu) NOTE: The audio polarity can also be reversed at the output of most Lectrosonics receivers. The character P denotes “positive” polarity and the character n denotes “negative” polarity.
HMa AUDIO Button Settings Press the AUDIO button repeatedly to select the setting. Each time the button is released, the screen will switch to the next setting. Press and hold the button when the desired setting appears on the screen, then use the UP and DOWN arrow buttons to adjust the setting. Adjusting the Input Gain The control panel Modulation LEDs indicate the modulation level and limiter activity.
Wideband Digital Hybrid® Plug-On Transmitter and high fault current with high resistance in the power supply feeds to pins 2 and 3. This provides protection if the supply current is accidentally shorted to ground and also keeps the microphone from being attenuated by the power supply. The HMa improves on those functions and is able to use less power from the battery by using constant current sources and current limiters.
HMa Remote Control with “Dweedle Tones” Various settings on the transmitter can be adjusted with special audio tones (“dweedle tones”) delivered to the microphone. The tones are generated by a smart phone using the LectroRM app. Accessories P/N 21750 Barrel Adapter LectroRM is a third party application written by New Endian for iOS and Android smart phones that generates the control tones for the remote control functions. The app is available for purchase from the App Store or Google Play for about $20.
Wideband Digital Hybrid® Plug-On Transmitter PHTRAN3 Replacement leather pouch with clear plastic screen cover, rotating belt clip and snap closure. Included with transmitter at purchase. MCA-TPOWER This cable adapter is to be used with the UH200D, UH400, HM and HMa 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.
HMa 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) Batteries are inserted backwards or dead. Transmitter not powered up. (See Operating Instructions, Power UP and Boot Sequence.) Gain control set to minimum. Batteries are inserted backwards or dead. Check PWR LED.
Wideband 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.
HMa Specifications and Features Operating frequencies: (Frequency usage varies by country) Band A1: 470.100 - 537.575 Band B1: 537.600 - 614.375 Band C1: 614.400 - 691.
Wideband Digital Hybrid® Plug-On Transmitter FCC Notice: For body worn operation, this transmitter model has been tested and meets the FCC RF exposure guidelines when used with the Lectrosonics accessories supplied or designated for this product. Use of other accessories may not ensure compliance with FCC RF exposure guidelines. Contact Lectrosonics if you have any questions or need more information about RF exposure using this product.
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. We strongly recommend that you do not try to repair the equipment yourself and do not have the local repair shop attempt anything other than the simplest repair.
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.
