Decade Transmitters FM-800 FM-800 and FM-850 User Manual Instruction manual
Decade Transmitters Inc FM-800 and FM-850 Instruction manual
Instruction manual
HI-FI MONO/ STEREO FM TRANSMITTERS FM-800 / FM-850 INSTRUCTION MANUAL In conformity with FCC part 73 regulations (Verification only) DECADE 9902-800/850 TABLE OF CONTENT PAGE SECTION 1: GENERAL INFORMATIONS ......................................... A) Introduction ............................................................... B) Description ................................................................ C) Warranty................................................................... D) Warning .................................................................... E) Technical specifications............................................. SECTION 2: FRONT & BACK PANEL DIAGRAMS............................ A) Front & back panel diagrams..................................... B) Front & back panel description .................................. SECTION 3: INSTALLATION ............................................................ A) Introduction ............................................................... B) Receiving inspection.................................................. C) Connections.............................................................. D) Location of the transmitter and antenna..................... SECTION 4: OPERATION................................................................. A) Controls and indicators.............................................. B) Input and output connectors...................................... C) Optimal input level .................................................... SECTION 5: MAINTENANCE AND PROGRAMMATION .................... A) Maintenance.............................................................. B) Frequency programmation ........................................ C) RF power level programmation .................................. SECTION 6: APPLICATIONS............................................................ 10 ANNEXES 11 ! FM-800 technical specifications............................. ! FM-850 technical specification.............................. 12 SECTION 1 GENERAL INFORMATIONS A) Introduction Thank you for purchasing one of the fine products made by DECADE transmitters. Your new FM-800 or FM-850 HI-FI STEREO FM TRANSMITTER is a very high performance and high reliability piece of equipment. Before using it, please read this manual carefully in order to obtain the best possible results from your transmitter. The manual contains installation, operation and programmation procedures for DECADE FM-800 (1.8 Watts) Hi-Fi mono and FM-850 (1.8 Watts) of Hi-Fi Stereo FM Transmitters. B) Description FM-800 and FM-850 transmitters include a high precision crystal controlled VCO, a digital stereo generator (FM-850 only), an RF power amplifier and a spurious filter. They accept left and right audio signals on two types of input connectors: XLR3: 600 Ohms balanced inputs, with signal levels of -4dBm min. 1/4": 6 to 10K Ohms unbalanced inputs, with signal levels of 10dBm min. Input level can be ajusted from the INPUT LEVEL control on the front panel, in order to get the optimum modulation level. That useful feature makes DECADE transmitters very versatile, allowing them to accept audio signals from many sources. C) Warranty FM-800 and FM-850 tranmitters come with a two (2) years warranty that covers parts replacement and labor required to repair any defects resulting from the manufacturing process. All claims must be authorized by DECADE prior to shipment of a faulty unit for repairs and a copy of the invoice must be included in the shipment. Shiping fees are assumed by the client and DECADE will pay for the return of the repaired unit. D) Warning DECADE transmitters operate on the 87.9 MHz - 107.9 MHZ commercial FM broadcast band, so signals transmitted by them can be received on any standard FM receiver. Thus, some care should be taken in the use made out of these transmitters. DECADE transmitters inc. is not responsible for any loss of profit or laws violation during the utilisation of their transmitters. The FCC legislate the use of FM transmitters.A license or special permit from FCC is required for the operation of these units. E) Technical specifications Refer to annexes, Technical specifications of FM-800 and FM-850. 4 (FRONT & BACK PANEL DIAGRAMS) FREQUENCY (MHz) FM -8 5 0 11 OVER BASS BOOST 12 TUNING LOCK STEREO 13 14 INPUT LEVEL POWER POWER MODULATION H I - F I S T E R E O F M T R AN S M I T T E R FREQUENCY (MHz) FM -8 0 0 10 11 POWER (WATTS) NORMAL 12 TUNING LOCK OVER 13 14 INPUT LEVEL POWER POWER MODULATION H I - F I F M T R AN S M I T T E R 17 16 AC INPUT POWER (WATTS) NORMAL 15 18 FUSE 0.5 A slow blow 19 20 LEFT INPUTS RIGHT INPUTS 21 FCC ID: Verification: This unit complies with FCC technical requirements. DOC/MDC: CAN 1857 231 175 CAN 1857 231 113 MFG : DECADE TRANSMITTERS INC. SHERBROOKE (QUEBEC) CANADA BALANCED UNBALANCED BALANCED UNBALANCED MODEL : FM-800 S/N : 0000 DECADE TRANSMITTERS INC. SHERBROOKE (QUEBEC) CANADA http://www decade ca RF OUTPUT 50 ohms FRONT & BACK PANEL DESCRIPTION Frequency display:Displays the programmed FM frequency (87.9 -107.9MHz) Frequency programmation switches: Directly dial the FM frequency. Power display: Displays the programmed RF power in Watts. 14 Power switch: Controls the AC power to the transmitter. Power programmation switches: Directly dial the RF power . 15 AC input:This is where you plug the AC extension (furnished with the transmitter). Modulation LEDs :Indicates the status of audio signal being modulated.Green led (5) indicates normal modulation(100% and less).Red led (6) indicates over modulation(100% and more) . 16 Bass boost switch:When activated,the bass boost switch enable a circuitry that will produce a 6dB gain from 20Hz to 150Hz . 17 19 Balanced inputs: Accept a low impedance, balanced (600 Ohms),line level audio signal. Note: The left & right inputs are electronicaly mixed to produce a mono signal (FM-800). Bass boost LED: Indicates that the bass boost is activated. 18 20 Unbalanced inputs: Accept a high impedance unbalanced (10K Ohms),line level audio signal. Note: The left & right inputs are electronicaly mixed to produce a mono signal (FM-800). 12 13 Stereo switch:When activated,the stereo switch enable a Power LED: Indicates that the AC power has been activated. Input level: Controls the audio level that is applied to the transmitter’s audio section. Fuse outlet: Main AC input fuse holder. digital circuitry that will produce stereo broadcasting. 10 11 21 Stereo LED: Indicates that the stereo mode is activated. Tuning lock LED: Indicates that the transmitter’s parameters have been stabilized and that the RF output section has been activated.An intentional delay of 4 seconds will occur . RF output: This is where you plug your coax cable that will reach your transmitting antenna (S0239 connector type,50 Ohms impedance). Note: It is recommended to use the best coax cable quality and as short as possible, in a manner to avoid RF power loss. SECTION 3 INSTALLATION A) Introduction Installation of a DECADE FM transmitter includes the following steps: 1) receiving inspection; 2) mounting in a rack or on a shelf; 3) connection of the AC supply and audio source; location, installation and connection of the antenna (optional). B) Receiving inspection Check the transmitter packaging for any damage that could have occured in the shiping. If you find any damage on the transmitter, keep the packaging for claiming purposes with the freight company. Any damage should be noted on the receiving slip at the time of delivery and the freight company advised within 5 workable days following the delivery of damaged units. C) Connections After installation of the transmitter in a rack or on a shelf, plug the AC cable in the AC receptacle on the back panel, and connect to a 120 V, 60 Hz grounded AC socket. As with any grounded electric equipement, it is not recommended to use a DECADE transmitter without a grounded AC socket, or removing the grouding pin on the cable, since that may result in shock hazards for the staff in contact with it. D) Location of the transmitter and antenna DECADE transmitters are designed for indoor or outdoor use in a dry environment, in temperatures ranging from -50 to 50 °C. In order to obtain optimum performances, it is recommended to place them far from any electromagnetic noise source (transformers, motors, etc.). Antenna should be located in a manner to comply with FCC regulations. SECTION 4 OPERATION A) Controls and indicators FM-800 and FM-850: Input level is controled by a stereo (FM-850) potentiometer, labeled INPUT LEVEL and located on the front panel. Two leds indicate the modulation level: NORMAL (green), wich lights up when the modulation level is equal of 50% to 100%, wich indicates a normal modulation state that is required for an undistorted signal at the receiving end.OVER (red), wich lights up when the modulation level is equal or greater than 101%, wich indicates an overmodulation state and could result in distortion at the receiving end. The OVER indicator shall never or rarely light, in order to avoid distortion. To allow a better perception of this indicator, its holding time has been lenghtened, because of its importance. The FM-850 transmitter can be switched from mono to stereo mode, in order to let you use the best mode for your particular application. The stereo selector is located on the front panel(STEREO). When in stereo mode, the STEREO indicator lights up.In mono mode, both inputs are active (balanced or unbalanced). Tuning lock: This indicator (front panel for FM-800 & FM-850 models) will lite up to show that your choosen FM frequency has been validated and that the RF output is active.A delay of 3 to 4 seconds is necessary before the system stabilize itself.This delay is mandatory in a manner to avoid frequency scrambling while it is in the stabilisation process. Bass Boost: This control (FM-850 only) when activated,will produce a bass boost of 6dB from 0Hz to 100Hz.This feature will enhance the bass response of any type of FM receivers,specialy those that are not equipped with a bass boost function. B) Input and output connectors FM-800 and FM-850 transmitters come with two sets of inputs: RIGHT and LEFT XLR3 balanced inputs and RIGHT and LEFT 1/4" unbalanced inputs, wich are the two most popular types of input connectors. The RF output has a female UHF (SO-239) connector and typical load impedance is 50 Ohms. Antenna cable (RG-8 or RG-58) should not exceed 100 feet in lenght for RG-8 and 50 feet for RG-58, in order to minimise the power loss in the cable. C) Optimal input level Optimal input level is reached when the OVER modulation indicator remains off at all time. Adjust the input level control to meet that condition. To obtain this result it is mandatory to compress the audio input signal (between your audio source output and the inputs of the transmitter inputs. The over modulation LED on the front panel shall never or rarely lit up.The level has to be adjusted in a maner to avoid over modulation. SECTION 5 MAINTENANCE AND PROGRAMMATION A) Maintenance No maintenance is required to keep the transmitter in top operating condition. If an external cleaning appears neccessary, use a soft, damp cloth and mild soap only. B) Frequency programmation The transmitting frequency is user programmable via a set of 4 decimal rotary switches (below the FREQUENCY digital readout) on the front panel (FM-800 & FM-850). 1) While the transmitter is off (Power switch is off),determine the frequency of your choice and compose in a squential fashion(from far left switch to right), the number of your choosen FM frequency. Ex: 102.3 MHz: First switch(far left)= 1, Second switch= 0 ,Third switch = 2 and Fourth switch = 3. Basicaly,what you are doing,is that you directly write the frequency number in Mega Hertz. Notice: While it is possible to select and read an FM frequency below and above the restricted frequency range (Ex: 80.1MHz or 195.9MHz),the system will always validate the lowest or the highest permissible FM frequency instead.The lowest being 87.9MHz and the highest being 107.9MHz.It is also applicable for a selected even frequency (Ex: 88.2MHz),where the system will validate the nearest odd frequency instead ( 88.3MHz). CAUTION: Never perform a frequency programmation while the unit is powered (power switch on). 2) C) Activate the power switch (front panel) to ON position.A delay of 3 to 4 seconds is required for stabilisation.The Tuning Lock indicator (front panel) shall lite up and activate the output section as soon as the stabilisation delay is over.You are now ready to broadcast. RF power level programmation The transmitting RF power is user programmable in the range of 0 Watt to 1.8Watts,in increments of 50 miliWatts, via a set of 3 decimal rotary switches (below the POWER digital readout) on the front panel (FM-800 & FM-850). 1) determine the RF power of your choice and compose in a squential fashion(from far left switch to right), the number of your choosen RF power. Ex: 500 miliWatts: First switch(far left)= 0, Second switch= 5 and Third switch = 0. Basicaly,what you are doing,is that you directly write the RF power number in Watts (500 miliWatts =.050 Watts). Notice: While it is possible to select and read an RF power above the restricted frequency range (Ex: 1.95 Watts),the system will always validate the highest permissible RF power instead.The highest being 1.8 Watts. NOTICE: It is possible to select a new RF power while the unit is powered (power switch on). 10 SECTION 6 APPLICATIONS Applications for DECADE transmitters are subject to FCC regulations , where a license is required. These units comply for the new FCC LP10 class concerning non profit community FM broadcasting applications.Please consult your nearest FCC bureau for further details concerning license demand. 11 TECHNICAL SPECIFICATIONS FM-800 RADIO SECTION: MODULATION: FM, deviation of 75kHz FREQUENCY RANGE: from 87.9 to 107.9 MHz (programmable) FREQUENCY PRECISION: 0.0008% or better HARMONICS REJECTION: 55 dB min., 60 dB typ. OUTPUT POWER: 0 mWatt to 1.8Watts, programmable in increments of 50 miliWatts. LOAD IMPEDANCE: 50 Ohms typ. ANTENNA CONNECTOR: UHF-F (SO-239) NOTIFICATION STANDARD: FCC Part 73 (Verification ) CONTROLS & INDICATORS: Frequency selection and readout,Power selection and readout, Tuning lock status. AUDIO SECTION: MODE: mono (HI-FI) FREQUENCY RESPONSE: 20 Hz - 20 000 Hz, @-1dB TOTAL HARMONIC DISTORTION: 0.05% max. SIGNAL TO NOISE RATIO: 70 dB min. DYNAMIC RANGE: 80 dB min. INPUT IMPEDANCE: 600 Ohms balanced (XLR), 10K Ohms unbalanced (¼") CONNECTORS: 2 X XLR3 and 2 X ¼" female jacks INPUT SENSITIVITY: balanced: 0dBm min.. unbalanced: -6 dBm min.(both inputs in use) INDICATORS:Normal and over modulation,power. CONTROL: input level, power switch MISCELLANEOUS: POWER REQUIREMENTS: 120 V, 60 Hz, 40 VA AC PROTECTION: grounded AC plug and 500 mA slow blow, 120 V fuse DIMENSIONS: 19" x 11" x 1.75" (48 cm x 28 cm x 4.5 cm), 1 rackmount space WEIGHT: 12 lb (5.45kg) DECADE Transmitters reserves the right to make changes or improvements in manufacturing or design of its products, wich may affect specifications. 12 TECHNICAL SPECIFICATIONS FM-850 RADIO SECTION: MODULATION: FM, deviation of 75kHz FREQUENCY RANGE: from 87.9 to 107.9 MHz (programmable) FREQUENCY PRECISION: 0.0008% or better HARMONICS REJECTION: 55 dB min., 60 dB typ. OUTPUT POWER: 0 mWatt to 1.8WattS, programmable in increments of 50 miliWatts. LOAD IMPEDANCE: 50 Ohms typ. ANTENNA CONNECTOR: UHF-F (SO-239) NOTIFICATION STANDARD: FCC Part 73 (Verification) CONTROLS & INDICATORS: Frequency selection and readout,Power selection and readout, Tuning lock status indicator. AUDIO SECTION: MODE: stereo/mono (HI-FI)(selectable) FREQUENCY RESPONSE: 20 Hz - 15 000 Hz, @-1dB * TOTAL HARMONIC DISTORTION: 0.05% max. SIGNAL TO NOISE RATIO: 65 dB min. DYNAMIC RANGE: 80 dB min. STEREO SEPARATION: 40 dB min., 45 dB typ. ** INPUT IMPEDANCE: 600 Ohms balanced (XLR), 10K Ohms unbalanced (¼") CONNECTORS: 2 x XLR3 and 2 x ¼" INPUT LEVEL: balanced: -4dBm min.. unbalanced: -10 dBm min INDICATORS: Normal and over modulation indicators , stereo and bass boost indicators CONTROLS: input level , mono/stereo selector,bass boost selector * Broadcast standard ** The minimum required separation for FM transmitters is 25 dB. The best receivers have a separation of 40dB, so the effective separation is more a matter of the quality of the receiver. MISCELLANEOUS: POWER REQUIREMENTS: 120 V, 60 Hz, 40VA AC PROTECTION: grounded AC plug and 500 mA slow blow, 120 V fuse DIMENSIONS: 19" x 11" x 1.75" (48 cm x 28 cm x 4.5 cm), 1 rackmount space WEIGHT: 12 lb (5.45kg) DECADE Transmitters reserves the right to make changes or improvements in manufacturing or design of its products, wich may affect specifications. 13
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