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Privacy Policy for broadcasthardware.blogspot.com
2008-03-19 02:55:00
Privacy Policy for broadcasthardware.blogspot.comIf you require any more information or have any questions about our privacy policy, please feel free to contact us by email at bhard@telkom.net.At broadcasthardware.blogspot.com, the privacy of our visitors is of extreme importance to us. This privacy policy document outlines the types of personal information is received and collected by broadcasthardware.blogspot.com and how it is used.Log FilesLike many other Web sites, broadcasthardware.blogspot.com makes use of log files. The information inside the log files includes internet protocol ( IP ) addresses, type of browser, Internet Service Provider ( ISP ), date/time stamp, referring/exit pages, and number of clicks to analyze trends, administer the site, track user?s movement around the site, and gather demographic information. IP addresses, and other such information are not linked to any information that is personally identifiable.Cookies and Web Beaconsbroadcasthardware.blogspot.c...
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Understanding TV Modulators
2008-03-13 20:24:00
INTRODUCTIONThe Modulator is an indispensable part of any Headend or control room. Most CATV technicians accept the use of Modulators and the fact that each channel requires a Modulator at the Headend. However often, details of why modulation is necessary to beginwith or the differences between various Modulators topology such as Saw Filter, single PLL, Double PLL and Frequency Agile Modulators, is often not fully understood. This article sets out to address these matters, in simple, easy to understand language.MODULATIONWhile we all understand that a Modulator is required to modulate each channel at the CATV Headend, why do we need tomodulate ? If we were to pass a single RF signal on a Cable TV network, the coaxial cable is well suited for the application. However, even one channel actually consists of two signals, in its simplest form the audio signal and the video signal. Therefore we would actually require two cables to carry a single television channel ! The situation would b...
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TV Modulator Circuit
2008-03-13 16:54:00
The MC1374 includes an FM audio modulator, sound carrier oscillator, RF oscillator, and RF dual input modulator. It is designed to generate a TV signal from audio and video inputs. This TV modulator based MC1374 IC From Motorola with wide dynamic range and low distortion audio make it particularly well suited for applications such as video tape recorders, video disc players, TV games and subscription decoders.The IC features:Single Supply, 5.0 V to 12 VChannel 3 or 4 OperationVariable Gain RF ModulatorWide Dynamic RangeLow Intermodulation DistortionPositive or Negative SyncLow Audio DistortionFew External ComponentsFor more info download datasheet - application note
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1W Linear Power Amplifier 2.4 GHz
2008-03-12 22:54:00
The following single-stage transistor linear amplifier possesses a gain of approximately 7 dB and an output power of 1 W in the 13 cm band (approx. 2.4 GHz). It is thus suitable for use, for instance, together with the 13 cm transmit converter. This hybrid power mixer equipped with a varactor diode type BXY. This mean that the described power amplifier can provide linear output power in the order of 1 W.CIRCUIT DESCRIPTIONA transistor type F1E6 manufactured by CTC is used. In this case of this transistor, the emitter is internally connected to the cooling bolt. This ensures that there are no problems with respect to the high-frequency grounding of the emitter. The circuit diagram of this amplifier is given in figure 1. The matching of the transistor input and ouput impedance to 50 Ohm is made using standard method in (2) The circuit for adjusting and stabilizing the DC-operating point is similar to the method described in (3)CONSTRUCTIONDouble coated, epoxy glassfibre material is...
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UHF VHF PLL TV EXCITER MC44BS374TI
2008-03-09 10:26:00
This UHF VHF PLL TV TRANSMITTER use a MC44BS374TI from Freescale. MC44BS374 is audio and video modulator for use in Transmit Video and audio and similar device. These IC are the next generation of the MC44BC374TI with the following new features :- TV output level 83dBuV- 5V and 3.3V compatible I2C bus- Logic Output Port pin (pin 3) availableMC44BS374 IS a PAL/NTSC Modulator with Integrated VCOThe channel is set by an on-chip high-speed I2C compatible bus receiver. A Phase-Locked Loop (PLL)tunes the modulator over the full UHF range.The modulator incorporates a sound subcarrier oscillator and uses a second PLL to derive 4.5, 5.5, 6.0,and 6.5 MHz subcarrier frequencies. These frequencies are selectable by bus.The picture-to-sound ratio may be adjusted using the bus. In addition, an on-chip video test pattern generator can be switched ON with a 1 KHz audio test signal.SCHEMATIC DESCRIPTIONDownload Schematic in PDF format, Trial HEX CODEA MC44BS374 R.F Modulator I.C is used to provide t...

BH1415F FM Stereo PLL Transmitter
2008-03-09 09:19:00
This is FM PLL Stereo based BH1415F IC from Rohm, it's has built in PLL and Stereo Encoder. You can download the schematic, pcb layout and Hex code. The transmitter menu display with LCD, and this have step 100Khz, 200Khz,.....1000Khz and have Mode menu (stereo/mono). In Action, LCD Display can solder directly on the bottom.Download : schematic, PCB all layer, top layer, bottom layer, hex codeBuy all components for this application here
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3 W Broadband Amplifier For UHF TV Transposers
2008-03-07 18:03:00
A broadband linear amplifier design is presented, suitable for application in TV transposers, operating in band IV and V(470 - 860) MHz. The design is based on a BLW898 bipolar transistor. Typical results at the recommended class-A biaspoint (25 V/1.1 A) for the total module include a 3-tone IMD level of -64 dB (fvision = -8 dB, fsideband = -16 dB and fsound = -10 dB) and an average gain of 10.5 dB at 3 W peak-sync output power in the (470 - 860) MHz frequencyrange.The BLW898 is a bipolar linear power transistor designed to operate in the (470 - 860) MHz range. The transistor isencapsulated in a SOT171A 6-lead rectangular flange package with a ceramic cap. The specified output power is 3 W peak-sync in class-A. The intermodulation distortion level (IMD) 10 dB at 860 MHz.For application in TV transposers for Band IV/V (470 - 860) MHz a wideband linear power amplifier has been designedoperating in class-A. It is suitable for driving higher power stages in TV-transposers. (datasheet)
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Microwave Homemade Outdoor Antenna 2.4 GHz
2008-03-06 04:57:00
DimensioningThe very first point in antenna dimensioning is to calculate the wavelength (the Lambda character has been replaced with letter L ):L /mm = 300 / (f/GHz) at 2.45 GHz L = 122 mm.Antenna picture without mast fasteners: Main parts can been found even in mama's dish cabinet but maybe safer to buy them from a department store. The Reflector is made from an aluminium cake pan and the Cover from a plastic microwave bulb, both 240--250 mm dia. The pan must be straight and smooth without profilations and the sides will be orthogonal with the bottom. If you find a pan made from stainless steel may be that may be better. I used a pan from italo ottinetti code 140024 , whose sides were 60 mm and I cut them to 32 mm.Other parts needed:A piece of copper water conduit, internal dia 10 mm, length below 40 mmA piece of brass rod, outer dia 4-4.5 mm, length N-connector, panel socketA couple pieces of tinned steel sheet e.g. from tin canA piece of PVC coated electric wire 1,5 mm2Scre...
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BLV859 UHF Linear Push Pull Power Amplifier
2008-02-18 15:38:00
A broadband linear amplifier design is presented, suitable for application in TV transposers operating in band IV and V (470 to 860 MHz). The design is based on two BLV859 bipolar transistorscombined with quadrature hybrids. Typical results at the recommended class-A bias point (25.5 V/9.1 A) for the total module include 40 W peak sync output power at -54 dB three tone IMD level (fvision = -8 dB, fsound = -10 dB, fsideband = -16 dB) and an average gain of 10.5 dB in the (470 to 860) MHz range.The BLV859 is a bipolar linear push-pull power transistor designed to operate in the 460 to 860 MHz range. With a specified output power of 20 W peak-sync in class-A it is the largest device in the new generation of transposer transistors. The intermodulation distortion level is 10 dB at 860 MHz. For application in TV transposers for Band IV/V (470 to 860 MHz) a wideband linear power amplifier has been designed with two BLV859 transistors in class-A.The amplifier consists of 2 balanced circuits...
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FET Audio Limiter
2008-02-15 07:26:00
This applicationis a very high specification peak control limiter. It has fast become the essential deviation limiter for FM radioThe application divided into two parts :Broadband Limiter Splitband LimiterActive component : FET 2N5457 and Ics NE5534, 2N5532, TL071 TL072.Download schematic and component mounted in Coreldraw 12 Format.
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Wideband Amplifer 470-860 MHz For TV Transmitter
2008-02-09 16:26:00
INTRODUCTION The construction taken from the application report NCO8101 two amplifiers for band 4/5 with BLV57 transistors have been described. Reactions on this report proved the necessity to give more information about the construction of these amplifiers. This construction has been based on a heatsink with a printed-circuit board at the upper side and the bias circuits and a forced air-cooling at the lower side. (download datasheet for schematic and instruction)PRINTED CIRCUIT BOARD In the printed-circuit board rectangular holes have been made to mount the BLV57 transistors on the heatsink. For fastening of the printed-circuit board on the heatsink by means of screws, 7 holes of 3.1 mm Æ and for fastening of the hybrid couplers 8 holes of 2.6 mm Æ have been made on the indicated places (see Figs 1 and 2). Hereby has been taken into account the use of Anaren hybrid couplers, type 10264 - 3, suited for the frequency range of 500 - 1000 MHz. Because the 2 bias units have been situat...
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100 Watts UHF Band IV-V TV Power Amplifier
2008-02-06 05:36:00
The TV amplifier has been tuned under class-A small-signal conditions and characterised under large signal class-AB conditions from band IV - V in UHF. (All Datasheets)Amplifier Circuit The total description of the amplifier is given in Figs 6 and 7 and Table 8 (in datasheet). The amplifiers input and output matching networks contain mixed microstrip-lumped elements networks to transform the terminal impedance levels to approx. 25 W balanced. The remaining transformation to 50 W unbalanced is obtained by 1 : 2 balun transformers. The baluns B1 and B2 are 25 W semi-rigid coax cables with an electrical length of 45° at midband and a diameter of 1.8 mm, soldered over the whole length on top of microstrip lines. To keep the circuit in balance two stubs L1 and L8 with the same length have been added. For low frequency stability enhancement the input balun stubs are connected to the bias point by means of 1 W series resistors. Large capacitors (C4 and C11) are added at the biasing points ...
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Microwave Power Meter
2008-02-04 04:55:00
Article from Hans Wagemans, ON4CDU A sensitive power meter is a very useful instrument when doing experiments. A few years ago when I started my microwave radio hobby up again, the first project I undertook was building a 23 cm transverter. During the development, a diode in front of my analog meter (VOM) was used to tune the microwave circuits to the resonance frequency. During the experiments, the need for a more sensitive and precise power meter was recognised. After some experiments it turned out that, based on the principle of the diode rectifier with a cheap amplifier behind it, a simple, but also sensitive and accurate power meter could be built. The circuitThe input circuit consists of a 'wide dynamic range' RF diode detector. This 'wide dynamic range' is obtained by applying a bias current of about 25 uA through the detector diode (D2). When using different diodes, the current can be adjusted by changing the 220 k resistors. Due to the bias current the detector has a go...
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Oxygen FM Manager
2008-01-31 12:04:00
Oxygen FM Manager is designed to give you full control over Nokia phones FM Radio. Load FM station presets from the phone to the PC's memory, easily edit them and upload back with just couple of clicks. Create custom FM presets, save them on disk and send them to the phone anytime you want. Oxygen FM Manager grants access to the Oxygen Online FM Stations Library that contains information about FM stations in cities all over the world.Compatibility :Program supports the following phones: Nokia 2255, 2300, 2355, 2855, 2855i, 3152, 3155, 3155i, 3200, 3205, 3300, 5100, 5140, 5140i, 6030, 6070, 6101, 6102, 6103, 6111, 6112, 6125, 6126, 6131, 6133, 6136, 6151, 6155, 6155i, 6165, 6165i, 6175i, 6200, 6220, 6225, 6230, 6230i, 6233, 6234, 6235, 6235i, 6236i, 6255, 6256, 6265, 6265i, 6268, 6270, 6275, 6280, 6282, 6510, 6585, 6590, 6610, 6610i, 6800, 6810, 7200, 7210, 7250, 7250i, 7260, 7270, 7280, 7360, 7370, 7380, 8310, 8800, 8801.Currently FM Manager doesn't support smartphones.License : F...
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14 Watts UHF TV RF Amplifier
2008-01-21 11:11:00
This amplifier work in frequency 470 - 860 MHz Band IV DAN V with power out 14 Watts with input power 1.5 Watts.SchematicPart Lists:C1 = C6 = C16 = 4,7 pF (500 V) multilayer ceramic chip capacitorC2 = C3 = C20 = C21 = 33 pF multilayer ceramic chip capacitorC4 = C9 = C13 = C19 = 1,2 to 3,5 pF film dielectric trimmerC5 = C7 = C15 = C17 = 100 nF multilayer ceramic chip capacitorC8 = C10 = C11 = C12 = 220 pF multilayer ceramic chip capacitorC14 = C18 = 6,8 mF/40 V solid aluminium electrolytic capacitorC22 = C23 = 1 pF (500 V) multilayer ceramic chip capacitorL1 = L2 = L13 = L14 = Coax. 50 Ohm with diameter 2,2 mm; lenght 29,0 mm, soldered on striplines75 W (1,1 mm ´ 28,0 mm). inner L1 dan L13 not connectedL3 = L4 = 52 W stripline (2,0 mm ´ 16,5 mm)L5 = L8 = 470 nH microchokeL6 = L7 = 39 W stripline (3,1 mm ´ 8,0 mm)L9 = L12 = 1 Turn (1,0 mm); diameter 5,5 mm; lead space 2 ´ 3,5 mmL10 = L11 = 39 W stripline (3,1 mm ´ 34,0 mm)L3, L4, L6, L7, L10 dan L11 are striplines on PTFE fibre-glass ...
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Simple RF Amplifier Protector Circuit
2008-01-18 11:30:00
This circuit protector is so simple, but it has big function in protecting your rf amplifier device. The input part signals for protecting are :Termo Switch (Heat Sensor Resistance) from your active component, RF Power transistor/FET.Forward and Reflect (reverse) from your directional coupler after your Low Pass Filter Output.Over Drive from directional coupler at the input of your rf amplifier to limit power input in normal condition.Relay (12v DC) for disconnecting power supply of your RF amplifier if condition for protecting happened.Attention :Do it manually before you install it in real condition. Don't forget to adjust 50K resistor for every input parts.
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CONVERT AV TO VHF TV RF Signal
2008-01-17 04:55:00
Small Circuit to send your Audio Video from DVD player or satellite receiver to VHF RF signal. This circuit connected to TV RF input via 75 ohm cable or telescopic antenna. Don?t use this circuit for more power without filter and use antenna only to transmit. Frequency range on vhf band about 50-250 MHz.You can change the transistor for transmitting on UHF band. Keep the components lead shortly. Recommended use crystal or PLL technic for stability of frequency.
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How To Stack Your Antenna On FM Broadcast Band
2008-01-14 09:33:00
Stacking your broadcast antenna will make your antenna have more gain. If your antenna have more gain, more ERP (Emmittion Radiating Power).What do you need for stacking antenna?- More antennas that identical each others.- Power divider to distribute your RF power to each antenna.- Jumper cables to connect antennasFor Stacking 4 Antenna Antenna : prepare 4 identical antenna. Tune the antenna for Matching on the working frequency.Power Divider : prepare 1 power divider with 1 port input and 4 ports output. Jumper Cables : any length of coax cable with 2 N connectors to connect between power divider and antennas.Determinate Range between Antennas ? When you install the antennas in collinear system, you must observe the distant ?D? (see drawing of follow page) between two antennas. The formula for calculate ?D? is: D = 0.75 x ? Where :0.75 = is the multiplicative coefficient;300? = -----------F(MHz)SWR reading on the frequency 94.4 Mhz
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FM LowPass Filter For 88-108 MHz
2008-01-13 10:50:00
Filter used for eliminate unwanted harmonic frequency at second and third. Notch filter, Band Pass Filter, and High Pass Filter sometime combined in constructing LPF design. Schematic below for FM Broadcast Lowpass Filter 88-108 MHz. It has tested with good result.Note : Make the coils at 74 nH and trim them to adjust exact value.
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MRF317 FM Amplifier 88-108 MHz
2008-01-13 10:42:00
FM amplifier is used for amplify signal from exciter in broadcast radio station. In this page, RF FM Amplifier uses solid state material with minimum gain 9dB. Input FM Amplifier needs 5-10 watt with power output about 100 watt. The Block schematic and datasheet

Satellite Antenna Alignment v2.38.0
2008-01-11 13:41:00
The program "Satellite Antenna Alignment " is used to calculate the angles necessary for installing satellite dishes. The main difference from similar software is the possibility to calculate the position for all satellites at once. Thus, you get a clear picture about what satellites can be physically visible from the location where the dish will be installed. Additionally, the program has a mechanism for calculating the azimuth of the sun and you can do everything without a compass now! Windows VistaLicense: Freeware Size: 988 Kb DownloadPlatform: Windows XP, Windows NT, Windows Me, Windows 98, Windows 95, Windows 2003, Windows 2000 , Windows VistaKeywords : Satellite - Dish - Antenna - Alignment - Sat-Satellite Dish - Satellite Dish Descrambler - Form Alignment - Dish Tv - Dish Network - Satelite Dish - The Dish Network - Dish Network Descramblers - Dish Network Website - Dish Network Hacks

ALDEMURA The Basic Path Loss SOFWARE FOR FREE
2008-01-10 02:49:00
A forecast model allows to avoid long and expensive measure campaigns.An efficient forecast model represents a valid tool to obtain attenuation estimates.Okumura's model was developed using measurement data taken at several frequencies in the Tokyo urban and suburban area.This method is most appropriate for urbanized areas where the study distance is relatively short (less than 30 km), the effective transmit antenna height is less than 200 meters, the effective receive antenna height is less than 10 meters, and the terrain is relatively flat. Download ALDEMURA 1.8 Mb from ALDENAIn 1980 Masaharu Hata simplified the consideration from Okumura (Empirical formula for propagation loss in Land Mobile Radio Services).These simplifications led to the restriction that only region with less than 20 km distance to the transmitter can be predicted. As only four parameter are require, the computation time is very short.This is an advantage of this model. However, the model neglects the terrain ...
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VHF TV Transmitter Band I
2008-01-06 06:24:00
Need to try building this old schematic! I take this schematic from my chinese friend in 1992. This TV Transmitter works in VHF TV Band I and you need crystal for generate the frequency. The final amplifier uses one 2SC1971 and 2SC2053 as buffer/driver stage. If you are creative, you should change crystal with PLL oscillator. Below is UHF VCO for Wideband 470-860 MHz.

FM Broadcast Antenna 88-108 MHz
2008-01-06 06:14:00
IntroductionAntenna is final device for sending any information from your transmitter. In fm transmitter you need signal transmitted to any direction so you need antenna type that transmitted with polarized circularly. Gain Antenna -3.2 dB, bandwith 500 KHz with maximum power handling 500 Watts. In order to use antenna on 88-108 MHz, broadband antenna type must be designed with no tune involved.How Your Signal AmplifiedAmplification of signal to transmit based on antenna gain in Decible. Signal from transmitter be able to doubled, tripled or even become more power. The value is called ERP (Emmittion Radiating Power). For Doubled your transmitter power to be ERP Power need stacked 4 antennas (3.12 dB gain antenna), 6 antennas (5.12 dB), 8 antennas (6.4 dB).ERP = Transmitter Power x Antenna gain
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FM Transmitter 300 Watt
2008-01-06 05:58:00
This FM Transmitter generates frequency 88-108 MHz by PIC PLL Program and built in oversampling Stereo Encoder (PIC Program) with LM13700 limiter audio. In manual book, transmitter amplified with one Mosfet Transistor . This Transmitter produced by broadcastwarehouse. In construction, FM Transmitter divided into three blocks :1. Audio Processing (Limiter + Oversample Stereo Encoder) Block2. RF Generator (VCO+ PIC PLL) Block3. Amplifier and Filter Block.Here is The Manual Technical with schematic

TV RF Amplifier 470-860 MHz
2008-01-04 23:25:00
TV Linear Power Amplifier for 470-860 MHz taken from Philips Aplication Note (AN_BLW32_33). Please download file in PDF format.The Wide-Band UHF Power Amplifier for TV Transposer band IV/V designed with transistor BLW32 and BLW33. In this case, my RF Amplifier design replaced them with 2 pieces BLW34 have good result. For combine two BLW34 download file here

Power Electronics Tutorial
2007-12-31 20:50:00
Interactive Power Electronics Online TextOnline course that includes diode circuits, fully controlled 1-phase and 3-phase bridge rectifiers, semi-controlled rectifier circuits, and switch mode power supply.www.eng.uts.edu.auFlorida Power Electronics CenterA power electronics research and development center at the University of Central Florida. Publications archive, courses notes, links.apec.engr.ucf.eduPower Electronics GroupPower Electronics Group of Ben-Gurion University. SPICE models downloads, tutorials, papers and theses.www.ee.bgu.ac.ilElectrical Machines and Power ElectronicsResearch in power electronics, electrical machines and drives. Contains abstracts of theses and papers.eme.ekc.kth.se3M Electronics ManufacturingManufactures materials and components for PCB manufacturing and assembly, semiconductor manufacturing and electronics products. Online product search, selection and specifications.www.3m.comCenter for Power Electronics SystemsA research center sponsored by the Na...
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Two ports 2.4 GHz RF Power Divider-Combiner
2007-12-24 06:44:00
This Power Divider Comb iner not only use for dividing or combining RF power on RF amplifier constructions, but also use in dividing RF power if you use more than one antenna for higher gain.The Construction of simple power divider combiner with the equation below : Z = 1.38 x log (1.08 x (D/d)) for square tube Where, D = The Inner Width of the tube d = The Outer Diameter (OD) of the inner conductor Z = Impedance The Equation of Impedance Approach : Z = 1.38 x log (1.08 x (D/d)) Z = 35.88 Ohms A = Chasis mount N Jacks B = Solder the N center connectors pins directly to the inner of the copper conductor C = 12.7 mm (1/2 inch) outer diameter (OD) copper conductor D = 25.4 mm (1 inch) square aluminium tube, with wall tickness of 2 mm For ¼ wave power divider, the impedance theoritical needs to be around 35, 35 ohms and impedance of the equation = 35.88 ohms with test result SWR Reading Notes : If you construct it with circle tube, the equation Z = 1.38 x log (1.00 x (D/d)). (D/d) ratio...
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Attenuator Design Tutorial
2007-12-23 20:12:00
IntroductionAttenuators are devices used to adjust signal levels, to control impedance mismatch and to isolate circuit stages.Passive designPassive attenuators consist of two types ?pi? and ?Tee? attenuators.1. Pi AttenuatorThe circuit for the Pi attenuator is shown in Figure 1. 2. Tee Attenuator The circuit for the T attenuator is shown in Figure 2 3. Bridged T AttenuatorThe circuit of the bridge T attenuator is shown in Figure 3 This circuit is commonly used with PIN diodes to form an electronic attenuator, as only two variable resistors are required (instead of 3 for the Pi or T attenuators).
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100mW VHF TV Transmitter #2
2007-12-18 14:15:00
Practice ChapterThe 100 mW transmitter board after the completion, we have to find a friend five students to experiment, to do a one-person, mainly through practice to check this board to the production of difficulty.Experimenters are not voluntary and not the whole experience in the production of electronic technology-loving, we will of this board divided into several steps to do.The first step Modulation of the installation, the following components in the circuit welding good. 1. TA7673 11 feet measured voltage is 3.8 V should be about.??TV will be the input RF (antenna port) between the RF modulator output, TV should be able to receive RF signals, the screen showed very pure white grating. Note: I should be separated from direct antenna function, and if not should be connected in series capacitor at straight.??AV input signal, adjustable device for the audio and video with the best.This step will determine the future of basic audio and video quality, it is necessary to repeatedl...
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