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 TRANSMITTERSFM-800 / FM-850INSTRUCTION MANUAL In conformity with FCC part 73 regulations(Verification only)
1 9902-800/850DECADE TABLE OF CONTENTPAGESECTION 1: GENERAL INFORMATIONS ......................................... 2A) Introduction............................................................... 2B) Description................................................................ 2C) Warranty................................................................... 2D) Warning.................................................................... 3E) Technical specifications............................................. 3SECTION 2: FRONT & BACK PANEL DIAGRAMS............................ 4A) Front & back panel diagrams..................................... 4B) Front & back panel description.................................. 5 SECTION 3: INSTALLATION............................................................ 6A) Introduction............................................................... 6B) Receiving inspection.................................................. 6C) Connections.............................................................. 6D) Location of the transmitter and antenna..................... 6SECTION 4: OPERATION................................................................. 7A) Controls and indicators.............................................. 7B) Input and output connectors...................................... 7C) Optimal input level .................................................... 8SECTION 5: MAINTENANCE AND PROGRAMMATION.................... 8A) Maintenance.............................................................. 8B) Frequency programmation ........................................ 8C) RF power level programmation.................................. 9SECTION 6: APPLICATIONS............................................................ 10ANNEXES ! FM-800 technical specifications............................. 11 ! FM-850 technical specification.............................. 12
2 SECTION 1GENERAL INFORMATIONSA) IntroductionThank you for purchasing one of the fine products made by DECADEtransmitters. Your new FM-800 or FM-850 HI-FI STEREO FMTRANSMITTER is a very high performance and high reliability piece ofequipment. Before using it, please read this manual carefully in order toobtain the best possible results from your transmitter. The manualcontains installation, operation and programmation procedures forDECADE FM-800 (1.8 Watts) Hi-Fi mono and FM-850 (1.8 Watts) of Hi-FiStereo FM Transmitters.B) DescriptionFM-800 and FM-850 transmitters include a high precision crystalcontrolled VCO, a digital stereo generator (FM-850 only), an RF poweramplifier and a spurious filter. They accept left and right audio signals ontwo 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 frontpanel, in order to get the optimum modulation level. That useful featuremakes DECADE transmitters very versatile, allowing them to accept audiosignals from many sources. C) Warranty FM-800 and FM-850 tranmitters come with a two (2) years warranty thatcovers parts replacement and labor required to repair any defectsresulting from the manufacturing process. All claims must be authorizedby DECADE prior to shipment of a faulty unit for repairs and a copy of theinvoice must be included in the shipment. Shiping fees are assumed bythe client and DECADE will pay for the return of the repaired unit.
3D) WarningDECADE transmitters operate on the 87.9 MHz - 107.9 MHZ commercialFM broadcast band, so signals transmitted by them can be received onany standard FM receiver. Thus, some care should be taken in the usemade 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 permitfrom FCC is required for the operation of these units.E) Technical specifications Refer to annexes, Technical specifications of FM-800 and FM-850.
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5FM-850HI-FI STEREO FM TRANSMITTERTUNING LOCKOVERNORMALMODULATIONSTEREOBASS BOOSTPOWERINPUT LEVELPOWERFREQUENCY (MHz) POWER (WATTS)FM-800HI-FI FM TRANSMITTERTUNING LOCKOVERNORMALMODULATIONPOWERINPUT LEVELPOWERFREQUENCY (MHz) POWER (WATTS)(FRONT & BACK PANEL DIAGRAMS)AC INPUTDECADE TRANSMITTERS INC. SHERBROOKE (QUEBEC) CANADAFUSE0.5 A slow blowLEFT INPUTS BALANCED UNBALANCEDRIGHT INPUTS BALANCED UNBALANCEDRF OUTPUT50 ohmsFCC ID: Verification: This unit complies with FCCtechnical requirements. DOC/MDC: CAN 1857 231 175CAN 1857 231 113MODEL : FM-800S/N : 0000MFG : DECADE TRANSMITTERS INC. SHERBROOKE (QUEBEC) CANADAhttp://www decade ca891071 5 13 14423 6 11 121 5 13 14423 6 11 1215 16 17 1918 20 21
6FRONT & BACK PANEL DESCRIPTIONFrequency display:Displays the programmed Power LED: Indicates that the AC powerFM frequency (87.9 -107.9MHz) has been activated. Input level: Controls the audio level that isFrequency programmation switches: Directly dial the applied to the transmitter’s audio section.FM frequency. .Power display: Displays the programmed RF power Power switch: Controls the AC power to thein Watts. transmitter.Power programmation switches: Directly dial the RF power . AC input:This is where you plug the AC extension (furnished with the transmitter).Modulation LEDs :Indicates the status of audio signal being Fuse outlet: Main AC input fuse holder.modulated.Green led (5) indicates normal modulation(100%and less).Red led (6) indicates over modulation(100% and more) .Bass boost switch:When activated,the bass boost switch enable Balanced inputs: Accept a low impedance,a circuitry that will produce a 6dB gain from 20Hz to 150Hz . 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. Unbalanced inputs: Accept a high impedance unbalanced (10K Ohms),line level audio signal.Stereo switch:When activated,the stereo switch enable a Note: The left & right inputs are electronicaly mixed to produce a mono signal (FM-800).digital circuitry that will produce stereo broadcasting. RF output: This is where you plug your coaxStereo LED: Indicates that the stereo mode is activated. cable that will reach your transmitting antenna (S0239 connector type,50 Ohms impedance).Tuning lock LED: Indicates that the transmitter’s parameters Note: It is recommended to use the best coaxhave been stabilized and that the RF output section has been cable quality and as short as possible, in aactivated.An intentional delay of 4 seconds will occur . manner to avoid RF power loss. 12345 67891011121314151617 1918 2021
7SECTION 3INSTALLATIONA) IntroductionInstallation of a DECADE FM transmitter includes the following steps: 1) receivinginspection; 2) mounting in a rack or on a shelf; 3) connection of the AC supply and audiosource; location, installation and connection of the antenna (optional).B) Receiving inspectionCheck the transmitter packaging for any damage that could have occured in the shiping. Ifyou find any damage on the transmitter, keep the packaging for claiming purposes with thefreight company. Any damage should be noted on the receiving slip at the time of deliveryand the freight company advised within 5 workable days following the delivery of damagedunits.C) ConnectionsAfter installation of the transmitter in a rack or on a shelf, plug the AC cable in the ACreceptacle on the back panel, and connect to a 120 V, 60 Hz grounded AC socket. As withany grounded electric equipement, it is not recommended to use a DECADE transmitterwithout a grounded AC socket, or removing the grouding pin on the cable, since that mayresult 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, intemperatures ranging from -50 to 50 °C. In order to obtain optimum performances, it isrecommended to place them far from any electromagnetic noise source (transformers,motors, etc.). Antenna should be located in a manner to comply with FCC regulations.
8SECTION 4OPERATIONA) Controls and indicatorsFM-800 and FM-850: Input level is controled by a stereo (FM-850) potentiometer, labeledINPUT 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%, wichindicates a normal modulation state that is required for an undistorted signal at thereceiving end.OVER (red), wich lights up when the modulation level is equal or greater than101%, wich indicates an overmodulation state and could result in distortion at thereceiving end. The OVER indicator shall never or rarely light, in order to avoid distortion. Toallow a better perception of this indicator, its holding time has been lenghtened, because ofits importance.The FM-850 transmitter can be switched from mono to stereo mode, in order to let you usethe best mode for your particular application. The stereo selector is located on the frontpanel(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 showthat your choosen FM frequency has been validated and that the RF output is active.Adelay of 3 to 4 seconds is necessary before the system stabilize itself.This delay ismandatory 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 6dBfrom 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 connectorsFM-800 and FM-850 transmitters come with two sets of inputs: RIGHT and LEFT XLR3balanced inputs and RIGHT and LEFT 1/4" unbalanced inputs, wich are the two mostpopular types of input connectors. The RF output has a female UHF (SO-239) connector and typical load impedance is 50Ohms. Antenna cable (RG-8 or RG-58) should not exceed 100 feet in lenght for RG-8 and50 feet for RG-58, in order to minimise the power loss in the cable.
9C) Optimal input levelOptimal 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 tocompress the audio input signal (between your audio source output and the inputs ofthe transmitter inputs. The over modulation LED on the front panel shall never orrarely lit up.The level has to be adjusted in a maner to avoid over modulation.SECTION 5MAINTENANCE AND PROGRAMMATIONA) MaintenanceNo maintenance is required to keep the transmitter in top operating condition. If an externalcleaning appears neccessary, use a soft, damp cloth and mild soap only.B) Frequency programmationThe 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 choiceand compose in a squential fashion(from far left switch to right), the number of yourchoosen 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 therestricted frequency range (Ex: 80.1MHz or 195.9MHz),the system will always validatethe lowest or the highest permissible FM frequency instead.The lowest being 87.9MHzand 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).
102) Activate the power switch (front panel) to ON position.A delay of 3 to 4 seconds isrequired for stabilisation.The Tuning Lock indicator (front panel) shall lite up andactivate the output section as soon as the stabilisation delay is over.You are now readyto broadcast.C) RF power level programmation The transmitting RF power is user programmable in the range of 0 Watt to 1.8Watts,inincrements of 50 miliWatts, via a set of 3 decimal rotary switches (below the POWER digitalreadout) on the front panel (FM-800 & FM-850).1) determine the RF power of your choice and compose in a squential fashion(from farleft 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 restrictedfrequency range (Ex: 1.95 Watts),the system will always validate the highestpermissible 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).
11 SECTION 6 APPLICATIONSApplications 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 FMbroadcastingapplications.Please consult your nearest FCC bureau for further details concerning licensedemand.
12TECHNICAL SPECIFICATIONSFM-800RADIO SECTION:MODULATION: FM, deviation of 75kHzFREQUENCY RANGE: from 87.9 to 107.9 MHz (programmable)FREQUENCY PRECISION: 0.0008% or betterHARMONICS 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, @-1dBTOTAL 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 jacksINPUT SENSITIVITY: balanced: 0dBm min.. unbalanced: -6 dBm min.(both inputs in use)INDICATORS:Normal and over modulation,power.CONTROL: input level, power switchMISCELLANEOUS:POWER REQUIREMENTS: 120 V, 60 Hz, 40 VAAC PROTECTION: grounded AC plug and 500 mA slow blow, 120 V fuseDIMENSIONS: 19" x 11" x 1.75" (48 cm x 28 cm x 4.5 cm), 1 rackmount spaceWEIGHT: 12 lb (5.45kg)DECADE Transmitters reserves the right to make changes or improvements in manufacturing or design of its products, wich may affectspecifications.
13TECHNICAL SPECIFICATIONSFM-850RADIO SECTION:MODULATION: FM, deviation of 75kHzFREQUENCY RANGE: from 87.9 to 107.9 MHz (programmable)FREQUENCY PRECISION: 0.0008% or betterHARMONICS 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 minINDICATORS: Normal and over modulation indicators , stereo and bass boost indicatorsCONTROLS: 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 ismore a matter of the quality of the receiver.MISCELLANEOUS:POWER REQUIREMENTS: 120 V, 60 Hz, 40VAAC PROTECTION: grounded AC plug and 500 mA slow blow, 120 V fuseDIMENSIONS: 19" x 11" x 1.75" (48 cm x 28 cm x 4.5 cm), 1 rackmount spaceWEIGHT: 12 lb (5.45kg)DECADE Transmitters reserves the right to make changes or improvements in manufacturing or design of its products, wich may affectspecifications.

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