M170 Belt Pack Transmitter OPERATING INSTRUCTIONS and trouble-shooting guide LECTROSONICS, INC.
INTRODUCTION Thank you for selecting the M170 Series transmitter. The M170 Series transmitters operate on high band frequencies from 150 MHz to 216 MHz. It is offered in five different versions to meet your specific needs. This manual covers all five versions. Only the M170 series transmitters are covered in this manual. Receivers are covered in separate manuals. All versions of the M170 Series transmitters will operate with any Lectrosonics high band VHF receiver.
GENERAL DESCRIPTION The M170 Series transmitter is offered in five versions. The standard model is the M170. The M170-LS, M170-XLR, M170-BGO, and the M170-CTM are modifications of the standard M170. The M170 and M170-LS transmitters use the microphone cord for the antenna. The M170-XLR uses the hand-held microphone for the antenna. This feature eliminates the need for the "dangling wire" antenna found on many transmitters.
M170 VARIATIONS 3
CONTROLS AND FUNCTIONS The MIC JACK is a locking micro jack that supplies "phantom power" for electret microphones such as the Lectrosonics M130, M140 and the HM142V and HM152V headset models. Insert the microphone cord plug into the jack and rotate it clockwise to lock it. It is important that the plug be securely locked, since the microphone cord serves as the antenna for the transmitter. The POWER ON/OFF switch turns the power on and off.
CONTROLS AND FUNCTIONS (cont’d.) The XLR MIC JACK (M170-XLR only) is a standard 3-pin audio connector (Switchcraft A3F) that will accept standard hand-held microphones with balanced or unbalanced outputs. The transmitter may be plugged directly onto hand-held microphones or worn on the belt when used with lavalier or headset microphones. The M170-XLR input is designed for best performance with balanced, low impedance (50 to 600 Ohms) dynamic microphones, but will work with high impedance mics.
BATTERY INSTRUCTIONS The battery you use in the M170 Series transmitter should be a 9 Volt alkaline, available almost everywhere. An alkaline battery will provide 12 to 15 hours of operation. Carbon zinc batteries, even if marked "heavy duty" will only provide about 4 hours of operation. Make sure your batteries are marked "alkaline." The BATTERY LAMP will light when the transmitter is turned on and will stay lit as long as the battery is good.
OPERATING INSTRUCTIONS (cont’d.) 6) A small screwdriver is supplied with the transmitter. The screwdriver is used to adjust the audio gain of the transmitter to match your microphone and your voice. The GAIN ADJUST is located on the side of the transmitter as shown on page 3. The adjustment is made while observing the modulation level lamps on the receiver control panel: a) Speak at the voice level you will be using during actual operation.
TROUBLESHOOTING Before going through the following chart, be sure that you have a good battery in the transmitter. It is important that you follow these steps in the sequence listed. SYMPTOM POSSIBLE CAUSE TRANSMITTER BATTERY LED OFF 1) Unit turned off. Check front panel on/off slide switch. 2) Battery is inserted backwards. 3) Battery is dead. NO TRANSMITTER MOD LEVEL LEDs 1) Gain control turned all the way down. 2) Battery is in backwards. Check power LED. 3) Mic capsule is damaged or malfunctioning.
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 out the inter-connecting cords and then go through the TROUBLE SHOOTING section in the 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.
M170-BGO SUPPLEMENTAL SHEET The M170-BGO was designed specifically for bingo halls. This transmitter is a lower cost alternative to a traditional system that uses multiple receivers. Since all the transmitters are on the same frequency, only one receiver is necessary. The special design of the transmitter solves the problem of multiple transmitters. Normally, if you have two transmitters operating at the same time, they must be on different frequencies.
SPECIFICATIONS AND FEATURES Operating frequencies: 150 to 216 MHz RF Power Output: 50 mW Deviation: ±15kHz Spurious Radiation: 60dB below carrier Frequency Stability: ±0.005% Equivalent Input Noise: -126dB Input Sensitivity: 8mV to 1.
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, we will, at our option, repair or replace any defective parts without charge for either parts or labor.
