Frequency Agile UHF Ultra-Miniature Belt-Pack Transmitter SM DIGITAL HYBRID WIRELESSTM ULTRA-MINIATURE UHF BELT-PACK TRANSMITTER OPERATING INSTRUCTIONS Professional Audio Products Since 1971 Rio Rancho, NM www.lectrosonics.
SM The SM transmitter is FCC type accepted under Part 74: 536-608 MHz and 614-806 MHz 2 Professional Audio Products Since 1971
Frequency Agile UHF Ultra-Miniature Belt-Pack Transmitter Thank you for selecting the Lectrosonics SM ultra-miniature transmitter.
SM GENERAL TECHNICAL DESCRIPTION GENERAL The 400 system uses ±75 kHz wide deviation for an extremely high signal to noise ratio. Switching power supplies provide constant voltages to the transmitter circuits from the beginning (1.5 Volts) to the end (0.85 Volts) of battery life, and an ultra low noise op amp is used as the input amplifier for quiet operation. It is gain protected with a wide range dual envelope input limiter which cleanly limits input signal peaks over 30 dB above full modulation.
Frequency Agile UHF Ultra-Miniature Belt-Pack Transmitter from the audio signal. Excessive low frequency content in the audio input can cause a variety of audio problems including driving the transmitter into limiting. INPUT LIMITER A digitally-controlled analog audio limiter is employed just before the analog-to-digital converter. The limiter has a range of more than 30 dB for excellent overload protection.
SM CONTROLS AND FUNCTIONS LCD Battery Compartment Cover Plate Antenna Battery Compartment Thumb Screw Modulation LEDs -10 -20 Audio Input Jack PWR LED Audio Button Up/Down Buttons Freq Button LCD SCREEN MODULATION LEDS The LCD is a numeric-type Liquid Crystal Display used in conjunction with the AUDIO and FREQ buttons, and the UP and Down arrows, to configure the SM. (See SM SCREEN SELECTIONS.) It is also used with the Modulation and PWR LEDs to monitor system operation.
Frequency Agile UHF Ultra-Miniature Belt-Pack Transmitter Simultaneously pressing the FREQ button and AUDIO button will power the transmitter on and off. The lock status, locked or unlokced, is preserved even if the unit is shut off. UP/DOWN ARROWS ANTENNA The Up and Down arrows are used to select the operating frequency, adjust the audio level, or set the Compatibility Mode. The fixed flexible cable antenna is supplied with the transmitter.
SM SM SCREEN SELECTIONS LCD Five screens are used to set up and operate the SM. These screens are used to set the operating frequency, adjust the audio modulation level, select the Compatibility Mode, lock or unlock the control panel and power down the transmitter FREQUENCY SCREEN The Frequency Screen displays the operating frequency in MHz when the system is initially turned on.
Frequency Agile UHF Ultra-Miniature Belt-Pack Transmitter BATTERY INSTALLATION The transmitter is powered by a standard AA 1.5 volt battery. We recommend using lithium battery for longest life. Lithium batteries provide over 4.5 hours of operation at room temperature. AA Battery Note Standard zinc-carbon batteries marked “heavy-duty” or “longlasting” are not adequate. The battery status circuitry is designed for the voltage drop over the life of lithium batteries. To install a new battery: 1.
SM OPERATING INSTRUCTIONS POWER UP AND BOOT SEQUENCE 1) Ensure that a good battery is installed in the unit. (See Battery Installation.) 2) Simultaneously press the AUDIO and FREQ buttons. As the unit turns on, the Modulation LEDs and PWR LED all glow red, then they all glow green. Then, they revert to normal operation, i.e., the Modulation LEDs glow according to the AUDIO level setting and the PWR LED glows green (providing the battery is in good condition).
Frequency Agile UHF Ultra-Miniature Belt-Pack Transmitter (See Controls and Functions, Frequency Screen.) Use the following procedure to change the Operating Frequency of the SM transmitter: 1) If the LCD is displaying something other than the Frequency Screen, press the FREQ button on the SM Control Panel to enter the Frequency Screen. LCD Up and Down Arrow Buttons frequency select switch setting. Simply use the Up or Down arrow to increase or decrease the operating frequency.
SM LOCKING OR UNLOCKING THE CONTROL PANEL as show in the chart below with only occassional forays into the +0 dB to +10 dB range.) Signal Level Less than -20 dB -20 dB to -10 dB -10 dB to +0 dB +0 dB to +10 dB Greater than +10 dB The Lock/Unlock function insures against unwanted operational changes to the SM during normal operation. -20 LED -10 LED Off Green Green Red Red Note The Locked/Unlocked status is non-volitile and is preserved even if the unit is turned off.
Frequency Agile UHF Ultra-Miniature Belt-Pack Transmitter 5-PIN INPUT JACK WIRING The wiring diagrams included in this section represent the basic wiring necessary for the most common types of microphones and other audio inputs. Some microphones may require extra jumpers or a slight variation on the diagrams shown. It’s virtually impossible to keep completely up to date on changes that other manufacturers make to their products.
SM If more headroom is needed, insert a 100k resistor in series with pin 5. Put this resistor inside the TA5F connector to minimize noise pickup.
Frequency Agile UHF Ultra-Miniature Belt-Pack Transmitter 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 PWR LED OFF 1) Battery is inserted backwards. 2) Battery is dead. 3) Transmitter not powered up. (See Operating Instructions, Power UP and Boot Sequence.
SM SPECIFICATIONS AND FEATURES Operating frequencies: Block 21 Block 22 Block 23 Block 24 Block 25 Block 26 Block 27 Block 28 Block 29 537.600 - 563.100 563.200 - 588.700 588.800 - 607.900 and 614.100 - 614.300 614.400 - 639.900 640.000 - 665.500 665.600 - 691.100 691.200 - 716.700 716.800 - 742.300 742.400 - 767.900 Frequency selection: 256 frequencies in 100 kHz steps per 25.
Frequency Agile UHF Ultra-Miniature Belt-Pack 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. Verify the integrity of the interconnecting cords and then go through the TROUBLESHOOTING section in the manual.
SM RETURNING UNITS FOR REPAIR You will save yourself time and trouble if you will follow the steps below: A. DO NOT return equipment to the factory for repair without first contacting us by letter or by phone. We need to know the nature of the problem, the model number and the serial number of the equipment. We also need a phone number where you can be reached 8 am to 4 pm (Mountain Standard Time). B. After receiving your request, we will issue you a return authorization number (R.A.).
Frequency Agile UHF Ultra-Miniature Belt-Pack Transmitter Rio Rancho, NM – USA 19
LIMITED ONE YEAR WARRANTY 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.
