Owner: The Broadcast Electronic URL:http://go2media.blogspot.com/ Join Date: Sun, 06 Jan 2008 22:21:07 -0600 Rating:0 Site Description: More Info about RF Transmitter, RF Amplifier, RF Filter, and RF Antenna.
Site statistics:Click here
MC145151 PLL FM Stereo Transmitter 2008-03-06 10:56:58 This transmitter use pll chip MC145151 from Motorola and stereo encoder chips BA1404 with vco built in. BA1404 from MC145151 is to overcome the single-frequency instability in the BA1404. Modulation of the emission control BB910 frequency. B571C kept in control procedures, the procedures required to prepare another.Amplifier section of this FM Stereo
transmitter use 2sc2053 with power 250 mWatt out. Read more:Transmitter
300mW FM Transmitter 2SC2538 2008-03-06 10:54:50 The FM transmitter using a varactor diode way radio, plus a Class C amplifier, RF output power of up to 300 mW more open to more than one kilometer distance communications. Select components: Q1 with ≥ 100 mA, Ft ≥ 300 MHz, β ≥ 100 tubes available 3 DG82, 3DG122, 3DG130, 2G711; Q2 with 2SC2538, 2SC1970, etc.. It must be noted that RF Baffles circle L8, L9, L10; C13, C14, C17, C18, C19, and so can not be omitted, otherwise it would cause unnecessary self-excited oscillation. L1, L5 need to tap extraction, data such as icons, not otherwise due to impedance matching, the output power of less than maximum. Such as a battery-powered, Q3 (Darlington tube), C15, R6 can be omitted. ebugging steps: first in the output termination of testing circuit to regulate the C7, C9, C12 to the largest Read more:Transmitter
High Quality wireless microphone Macsot MR-700 2008-03-06 10:52:00 This is collected by the Macsot MR-700 wireless microphone
system launch of the circuit for maintenance reference. High Quality
Audio on receiver output.Active components:Microphone or Audio Preamplifier with IC MC4458Dynamic Audio processed with one NE571 From PhilipsFrequency Oscillator generated by one crystal 20.05 MHz and Varactor diode 2CB11A. No drift frequency is guaranted.9V DC power supply or battery. More info ...
uPC1651 FM transmitter 2008-03-06 10:47:16 The circuit has been produced by Japan's NEC as a major upc1651 IC devices, the high gain circuit, work stability, thereby ensuring the microphone performance. Use of FM transmitter. Used it 40 - 50 cm soft drag line for antenna, the effective range of more than 30 launch M. L carefully spacing adjustment and fine-tuning capacitor, will launch frequency coverage for 88 - 108 Mhz. Map L enameled wire with diameter of 0.51 mm in diameter, 4 mm cylindrical Tuitai from around 5 laps. More info ...
FM Transmitter With Transistor 2SC1815 2008-03-06 10:46:15 Will have to introduce a system of simple and small FM transmitter. Not only does it meet the requirements of the launch distance, but also at the same time using microphone and voice input signal line, background voice. Modulation circuit surveillance has also joined the table first, so that they can better control and the proper use of transmitters, the following circuit diagram, read briefly, whether it's just like a radio station equipment as many functions. Yes, this small transmitter can help you easily set up an amateur FM radio stations! 500 M in the coverage around. Echocardiography the bar, act immediately!Principle small FM transmitter circuit components and options:Signal to the microphone after intake, the C1 coupling into the BG1 and external circuit voltage of the single neg Read more:Transmitter
Making Simple TV transmitter 2008-03-06 10:44:42 (1) Soundless versionYou are familiar with the most simplest FM transmitter" that I designed (left). Let's try to transform it into a TV transmitter. Just change the input from the audio to the video (video camera or VCR) and check the signal at your television set: in Europe, for instance, choose the channel 2 - 4 and turn the trimmercap ot the transmitter. You will find some images or might watch a clear image. This suggests that it will be not so difficult to build a TV transmitter.(2) Advanced Version (AV)When you succeed in this version to work, you may try the advanced version (pdf). In this version, stability and quality are improved. This can have even the audio too. However, in order to complete this, you have to use a proper frequency counter. More info ... Read more:Simple
Preamplifier 88-108 MHz 2008-03-06 10:43:32 This VHF amplifier working on Band 2 Radio Spectrum tuning approximately 88 - 108 MhzThe Preamplifier circuit uses two 2N3819 FET's in cascode configuration. The lower FET operates in common source mode, while the upper FET, operates in common gate, realising full high frequency gain. The bottom FET is tunable allowing a peak for a particular station.Coil details follow:L1 4 turns of 18swg air spaced with a 1cm diameter, the tap is one turn up from earth end...L2 4 turns of 18swg air spaced with 1 cm diameter. The coupling coil is 1 turn interwound from the supply end. Enamel coated wire must be used. More info ...
Microphone FM Transmitter 2008-03-06 10:41:48 This simple transmitter operates from a 9V battery as shown above. The old FM mic system was not a perfect solution, so I built this kit and a mixer for the receivers. using three separate transmitter circuits and a mixer on the receiever, the choir voices were perfect and cleanly reproduced."From the notes I made experimentally, C3 is vital to the circuit and without it the circuit may become unstable. C4 is in parallel with C5 and presents a moderate load impedance. Finally all transistors are NPN. The circuit works well and has proved reliable. More Info ... Read more:Transmitter
FM Transmitter with 4 Transistors 2008-03-06 10:40:41 This circuit provides an FM modulated signal with an output power of around 500mW. The inputMic preamp is built around a couple of 2N3904 transistors, audio gain limited by the 5k preset.The FM Transmitter
oscillator is a colpitts stage, frequency of oscillation governed by the tank circuit made from two 5pF capacitors and the inductor. Frequency is around 100Mhz with values shown. Audio modulation is fed into the tank circuit via the 5pf capacitor, the 10k resistor and 1N4002 controlling the amount of modulation. The oscillator output is fed into the 3.9 uH inductor which will have a high impedance at RF frequencies.The output stage operates as a class D amplifier , no direct bias is applied but the RF signal developed across the 3.9 uH inductor is sufficient to drive this stage. The em
Voice FM Transmitter Circuit 2008-03-06 10:39:17 It is illegal in most countries to operate radio transmitters without a license so take care with transmitter circuits. This FM Low Power circuit may be tuned to operate over the range 87-108MHz band II, with a range of 20 or 30 metres.Active components in this circuit are BC548 transistors. Although not strictly RF transistors, they still give good results. I have used an ECM Mic (Voice
FM ) insert from Maplin Electronics, order code FS43W. It is a two terminal ECM, but ordinary dynamic mic inserts can also be used, simply omit the front 10k resistor. The coil L1 was again from Maplin, part no. UF68Y and consists of 7 turns on a quarter inch plastic former with a tuning slug. The tuning slug is adjusted to tune the transmitter. Actual range on my prototype tuned from 70MHz to around 120MH Read more:Circuit
, Transmitter
VHF UHF TV modulator 2008-03-06 10:37:48 Simple TV Modulator that working on VHF UHF Band, the oscillator generates frequency is modulated with the video signal and the modulated carrier wave thus generated is fed into the TV set's aerial input via a cable. Then all that remains to do is tune the VHF UHF TV set to the correct frequency.The harmonics generator converts the oscillator signal into a sort of frequency spectrum containing all the multiples of 27 MHz up to about 1800 MHz. The TV modulator's output signal is made up of a large number of little peaks, each of which is a complete transmitter signal. At least one of these will always be in band I (VHF channels 2. . . 4), one in band III (VHF channels S. . .12) and many of them will be in bands IV and V (UHF channels 21.. .69). More info ...
TV Transmitter Band I and III 2008-03-06 10:36:08 This TV transmitter working on VHF Band I and III, using negative sound modulation and PAL video modulation. This is suitable for countries using TV systems B and G, like Australia and Indonesia.This circuit has not been tested at UHF frequencies. The modulated sound signal contains 5.5 -6MHz by tuning C5. Sound modulation is FM and is compatible with UK TV Transmitter
System I sound. The transmitter however is working at VHF frequencies between 54 and 216MHz (band I and Band III) and therefore compatible only with countries using Pal System B and Pal System G. More info...
FM Amplifier 88-108 MHz 2008-03-06 10:29:14 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
Antenna For UHF TV Transmitter 2008-03-06 10:29:00 Description :Antenna
used for TV Broadcast Antenna UHF Band IV-V (470-860 MHz). Antenna can use for broadband Antenna TV Transmitter
. It's called UHF Panel Antenna.Antenna Gain.The UHF TV Transmitter Antenna have gain 10 dB. It can be tripled or more the transmitter power. Tne antenna is packed with Radome to protect from ice or snowDimension of AntennaDownload file in Corel 12 Format here ...
TV Linear Power Amplifier 470-860 MHz 2008-03-06 10:28:47 RF 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 Read more:Linear
How To Stack FM Broadcast Antenna 2008-03-06 10:28:35 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. Determine 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 form Read more:Broadcast
, Stack
VHF TV RF Signal From AV Sources. 2008-03-06 10:28:19 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.
UHF TV RF Amplifier 470-860 MHz 2008-03-06 10:28:03 Working Frequency 470-860 Mhz UHF Band IV and V. Power out of the RF Amplifier
about 14 Watts with power input 1.5 Watts. ( Transistor Datasheet)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 = 4
100W Broadband UHF TV Power Amplifier 2008-03-06 10:27:47 The TV amplifier has been tuned under class-A small-signal conditions and characterised under large signal class-AB conditions from 470 - 860 MHz. (All Datasheets)Schematic Circuit Amplifier
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 Read more:Power Amplifier
FM Transmitter 88-108 MHz 2008-03-06 10:26:50 Main device to transmit signal is transmitter and in broadcast FM is called FM transmitter. FM Transmitter
divided by into three block :1. Audio Processing Block2. RF Generator (VCO+PLL) Block3. Amplifier and Filter Block.For covering 88-108 MHz, the transmitter must be wideband FM Transmitter. For stability Frequency output must be PLL FM Transmitter. For Long Range Transmission must be High Power FM Transmitter.Below is FM Transmitter Product from BROADCAST WAREHOUSE, Model : ALLONE FM TRANSMITTER 1 WATTHere is The Manual Technical with schematic
Low Pass Filter For FM 88-108 MHz 2008-03-06 10:24:59 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. Read more:Filter
RF Amplifier Protector Circuit 2008-03-06 10:21:11 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. Read more:Amplifier
, Circuit
FET Audio Limiter 2008-03-06 10:19:43 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 LimiterSplitband LimiterActive component : FET 2N5457 and Ics NE5534, 2N5532, TL071 TL072.Download schematic and component mounted in Coreldraw 12 Format. Read more:Audio
150 WATTS FM AMPLIFIER BASED SD1407 2008-03-09 04:12:39 This FM amplifier is originally designed by Broadcast Warehouse, based transistor SD1407 with redrawn schematic and redesigned pcb. You can drive the amplifier with maximum 1 watt input for 150 watts FM output.Working frequency 88-108 MHz VHF band II, Power supply voltage 18-28 VDC.Download : schematic, PCB all layer, top layer, bottom layer. More info ...
70-210 MHz Voltage Controlled Oscillator 2008-04-02 16:00:49 The VCO is based on a Hartley oscillator. The frequency is determined by L1 and capacitor C1. The Vtuning voltage will change the capacitance in the varactor BB132 wich will change the oscillation-frequency. The value of capacitor C2 will determine how much the frequency can be changed by the tuning voltage. The larger value the more the frequency will change. This VCO is based on two dual-gate FET. First FET is a Hartley oscillator where the frequency is determined by the value of L1, C1, C2 and the varicap diod. C2 set the span of the VCO. The second FET is just an amplifier. The gain is less than 1, but the current will be higher and the oscillator will not be loaded. The output amplitud changes depending on the frequency and how many turns there is on L1. By changing the voltage on g2 Read more:Voltage
1W FM Amplifier For Ipod FM Stereo Transmitter 2008-04-02 15:47:04 The schematic show you a RF amplifier with very high gain. The feeding RF signal enter C9 to transistor Q1 which has a self biased working point. The gain and working point is set with the two resistors R1 and R2. FB1, C5, C6 works as filter for rejecting RF to power line. Q1 has a gain about 15dBm. The output signal can be found a the collector which then enter a second amplifier stage Q2. This stage also has a self biased working point.The gain is set by the resistors R3//R4 and R5//R6.Why do I have 2 parallel resistors like that?It is because I want to be able to change the gain of the amplifier. On the PCB below you will see that I only have 2 pads for the resistors. When I want to resistors I solder the two resistors R5 and R6 on top of each other and the same with R3 and R4.I advice Read more:Amplifier
, Stereo
, Transmitter
Low Power TV Transmiter 2008-05-07 21:50:37 One of the most useful gadgets a video enthusiast can have is a low-power TV Transmitter. Such a device can transmit a signal from a VCR to any TV in a home or backyard. Imagine the convenience of being able to sit by the pool watching your favorite movie on a portable with a tape or laserdisc playing indoors. You could even retransmit cable TV for your own private viewing. Videotapes can be dubbed from one VCR to another without a cable connecting the two machines together.When connected to a video camera, a TV transmitter can be used in surveillance for monitoring a particular location. The main problem a video enthusiast has in obtaining a TV transmitter is that a commercial units are expensive. However, we have some good news! You can build the TV Transmitter described here for less.F
Recommend Site To A Friend
