Owner: RF Transmitter Circuits Resources URL:http://rf-transmitter.blogspot.com/ Join Date: Wed, 03 Sep 2008 09:27:01 -0500 Rating:0 Site Description: RF circuit schematic for rf transmitters, rf receivers, rf signal, rf filters, rf amplifiers, rf antenna Site statistics:Click here
Adjustable BandPass Filter for 88-110 MHz 2008-09-03 10:45:34 This RF filter circuit is a bandpass filter VHF FM for frequency 88-110 MHz. The schematic you find here comes from an old Dutch magazine called Free Radio Magazine and is designed by VEROBB-DX. The filter is build symmetrical and has both INPUT and OUPUT impedance of 50 Ohm. So it can be used after each buffer-, driver- or amplifier-stage.
The dimensions of the coils' diameter is the INNER-dia Read more:Filter
5W High Quality PLL FM Transmitter 2008-09-03 05:47:27 The FM transmitter circuit is a high quallity transmitter that includes RDS/SCA input and Audio/MPX input with optional preemphasis. It can be used with or without stereo encoder. Tuning over the FM band is provided by two buttons. The transmitter can work also without the LCD display.
This FM transmitter is easy to build, and a high-quality PLL FM transmitter with typical output pow Read more:Quality
, Transmitter
High Quality Stereo Encoder for FM Broadcasting 2008-09-03 05:44:47 This stereo encoder uses a digital and analogue processing. The sampling frequency used in this stereo encoder is 97x higher than the pilot tone frequency. This makes very easy to reject all spectral residues around the sampling frequency without affecting the main signal characteristics. Using of a microcontroller allows to build this stereo encoder with reduced part count and get excellent resul Read more:Broadcasting
, Encoder
, Quality
, Stereo
500W VHF Power Amplifier Up to 500 MHz 2008-09-02 13:21:22 This VHF Power amplifier circuit is 500 watt Multi-use VHF Power Amplifier
for frequency up to 500 MHz. The original post taken from The Broadcast Hardware Blog. This amplifier module incorporates microstrip technology and a single BLF369 mosfet transistor. Input/Output 50 ohms and Power out 500W minimum with a 3 to 5 watt input. Power Supply requirements 22.5 Amperes 32 volts.
Here's the
FM Transmitter 4 Transistor 2008-09-02 13:05:54 This FM transmitter circuit provides an FM modulated signal with an output power of around 500mW. The input mic preamplifier is built around a couple of 2N3904 transistors, audio gain limited by the 5k preset. The oscillator is a colpitts stage, frequency of oscillation governed by the tank circuit made from two 5pF capacitors and the inductor. ( Click here for Colpitt Oscillator Resonant Frequ Read more:Transmitter
10W HF Linear Amplifier 1.8-30 MHz 2008-09-02 12:57:01 This Linear
amplifier circuit describes a 10 watt linear amplifier that is capable of delivering over 15 watts into 50 ohms and uses cheap plastic transistors that are used in CB equipment. The bias generator transistor, TR4, is marked TIP31 in the circuit diagram, but here you can use just about anything that will fit. You could even use another 2SC2078, if you had money to burn, but more practi Read more:Amplifier
Hifi FM Stereo Transmitter With BA1404 2008-09-01 14:12:43 This FM Transmitter
uses integrated circuit (IC) BA1404 for generating frequency and audio signal. With BA1404 HI-FI Stereo
transmitter you will be able to transmit MP3 music from your iPod, computer, discman, walkman, TV / SAT receiver, and many other audio sources.
The above FM transmitter design is a result of many hours of testing and tweaking. The goal was simple; to test many existing BA14
Coil-les FM Transmitter 2008-09-01 13:46:16 This FM Transmitter
circuit does not use coil for determining output frequencies. The working frequency based on the harmonics frequency of the IF FM ceramic filter 10.7 MHz.
The RF oscillator of the fm transmitter using the inverter N2 and 10.7Mhz ceramic filter is driving the parallel combination of N4 to N6 through N3. Since these inverters are in parallel the output impedance will be low so
150W VHF Power Amplifier Circuit 2008-08-31 13:51:26 The RF power amplification of the RF amplifier circuit is provided by one or two transistors, MRF247. The standard power version uses one transistor (MRF247) and the high power version uses two. Each transistor is rated at 75 watts output. The input and output impedances of the transistors are matched to 50 Ohm by microstrip matching networks.
The amplifiers are broadband and do not have any tun Read more:Amplifier
, Circuit
70W RF Power Amplifier for 66-88 MHz 2008-08-31 13:48:59 This circuit is a RF power amplifier that RF power amplification is provided by a single transistor, MRF492 . The transistor provides at least 10dB gain in the 66-88 MHz frequency range. The input and output impedance of the transistor is matched to 50 Ohm by networks which use printed micro-strips and lumped elements. Variable capacitors C9, C12, C21 and C22 are used to tune the amplifier for opt Read more:Amplifier
, Power Amplifier
FM Transmitter 2 Transistor 2008-08-31 13:48:11 This FM Transmitter
circuit uses 2 transistors. This circuit may be tuned to operate over the range 87-108 MHz with a range of 20 or 30 metres.
Take care with fm transmitter circuits. It is illegal in most countries to operate radio transmitters without a license.
Transistor that used in this FM Transmitter circuit a pair of BC548 transistors in this circuit. Although not strictly RF transistor
AM Transmitter With BC109 Transistor 2008-08-31 13:47:33 This RF transmitter circuit uses amplitude modulation (AM) spectrum. Please note, It is illegal to operate a radio transmitter without a license in most countries. This ircuit is deliberately limited in power output but will provide amplitude modulation (AM) of voice over the medium wave band.
The circuit is in two halfs, an audio amplifier and an RF oscillator. The oscillator is built around Q1 Read more:Transmitter
FM Transmitter 15W 2008-08-31 12:33:41 How to build a good FM Transmitter
? It begins with getting a good schematic. You don't have to understand the precise working of the transmitter to build it. But some basic information won't harm. A transmitter alone is, as you probably know, is not enough to start your radio-station.
This FM Transmitter is stable and has output of 15-18 watts. This enough to terrorize your wide surroundings at
FM Transmitter With A Single Transistor 2008-08-31 12:12:54 Here is circuit for simple FM Transmitter
with a single transistor. Mini FM transmitters take place as one of the standard circuit types in an amateur electronics fan's beginning steps.
FM transmitter circuit given below will serve as a durable and versatile FM transmitter till you break or crush it's PCB. Frequency is determined by a parallel L-C resonance circuit and shifts very slow as battery
Privacy Policy 2008-08-31 12:12:13 Privacy Policy
for RF-TransmitterIf 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 RF-Transmitter, 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 RF-Transmitter and how it is used.
Log F Read more:Privacy
, Privacy Policy
20W UHF RF Amplifier for 430-470 MHz 2008-09-16 23:44:10 This UHF RF Amplifier
circuit uses MH720A1 hybrid power module from Mitsubishi that operates between 430MHz and 470MHz and will output approximately 20 Watts of RF power from a 10mW input source. This amplifier can be used as part of a 457MHz pager transmitter.
This hybrid power modules amplifier are offered by various manufacturers and can often be obtained second hand of amateur rallies. Most
200W Lowpass Filter for 150 MHz (2 Meter) 2008-09-09 12:24:33 This Lowpass filter used for the amplifier can also be constructed as a standalone filter for use with any other 2 Meter
Amplifier upto 200 Watts output.It was designed to bring the Harmonic & Spurious outputs generated by the amplifier module to acceptable levels ( Note within specification of the UK Amateur Radio transmitting licence harmonic spurious levels are not specified to absolute lev Read more:Filter
1000W FM Amplifier Service Manual 2008-09-09 12:24:15 Here's 1000W FM amplifier and it a modern FM amplifier which integrates solid state reliability with the digital technology which makes it safe and easy to use.
High gain MOSFETs transistors and systematic use of state of the art manufacturing methods. The amplifier, of simple and rugged construction, is able to satisfy the requests of all those end-users looking for top-quality equipment at reas Read more:Amplifier
, Service
6W RF Power Amplifier with 2SC1971 2008-09-09 12:24:01 This RF Power Amplifier
taken from FRB Amplifier Kit. It uses 2SC1971 for FM broadband design from 88 to 108 MHz.
Power Amplifier
Schematic Circuit
Power Amplifier Printed Circuit Board and Component Layout
Assembley Instructions
RF power amplifier assemble by soldering the components to the pads indicated. Keep coil, resistor, and capacitor leads as short as possible. The coils should be
FM Stereo Encoder with Overshoot Compensator 2008-09-09 12:22:28 The following circuit is stereo encoder for fm broadcasting transmitter. The stereo encoder circuit schematic divided by into five parts.Digital Section (click for schematic)
Analogue Section (click for schematic)
Input Output and PSU (click for schematic)
Overshoot Compensator (click for schematic)
23 KHz Oscillator and Logic (click for schematic)
The stereo encoder circuit uses oversampling met Read more:Encoder
, Stereo
Optimized 6/9 Element VHF Yagi Antenna 2008-10-06 14:18:20 This antenna project written by Guy, ON6MU. The reflector and driven are copper. 1/4 inch copper pipe used shorting bar for gamma. Held in place using stranded copper wired. Permantly soldered in place after final tuning adjustments. 14 gauge wire with shrink tubing installed at SO 239 or N connectror. "Coax seal" on tip of gamma rod to keep out moisture, printed grey.
Source: Read more:Antenna
, Element
RF/VHF Switch with One Transistor (RF-Sensing) 2008-09-29 07:32:33 This RF circuit is RF Switch will work from almost any RF-frequency an from 0.1W up to 100W. It can be used to switch on/off pre-amps or amplifiers, repeater rf-in sensor, or anything else you want to switch on or off when starting to transmit.
The RF Switch schematic will work just fine between 50 MHz and 440 MHz . It can be improved (peaked) if you should use it for one band only, say for exam
100W Transistor Amplifier for 144 MHz with MRF317 2008-09-29 06:59:43 The amplifier is for 144 MHz and build into a metalbox measuring 240x160x160 mm. The space is mainly taken up by the 28 V / 7 A power supply. On the rear side of the box the amplifier is mounted against a big heat sink. The amplifier itself is build on a piece of double sided PCB about 140x100 mm.
There is no PCB artwork for the amplifier, simply cut out square islands with a knife, for solderin Read more:Amplifier
Portabel Yagi Antenna for 144 MHz 2008-09-29 06:46:06 This simple seven element Yagi antenna is ideal for portable operation. The elements can be removed and replaced in a couple minutes. The 2.42 Metre boom will fit inside my car. All of the elements are made from 6mm solid aluminium rod. The boom is made from 50x25mm (2x1 in) timber.
The driven element of the antenna is a half wavelength dipole. Unlike the more common type of folded dipole, this Read more:Antenna
Approximate Air Coil Inductance Calculator 2008-09-29 01:23:10 Here's a tool for calculate air inductance and it's valid only for one layer, tightly wound, air core coils without gaps between the turns.
Approximate Air Coil Inductance Calculator
Design an L-C Low Pass or High Pass Filter 2008-09-26 14:27:52 Here's a tool for design L-C Low pass or High pass filter. This web based application allows the user to design simple radio frequency filters with inductors and capacitors. These filters are most effective between 50 KHz and 500 MHz. Below 50 KHz active filters are usually more cost effective and above 500 MHz strip lines are generally used.
Below the link and you just select and type commands Read more:Filter
80W RF Power Amplifier Up to 30 MHZ 2008-09-23 06:34:54 Here's RF power amplifier project, especially those who make QRP transmitters or exciters, are always looking for a linear amplifier to get more RF Output. Schematic and PCB are based on an article in ARRL Handbook 1981-3 detailing MRF454 Linear amplifier construction by K7ES.
In PCB, the power amplifier has made is using a DIP 723 in place of G package which was not available to me at that ti Read more:Amplifier
, Power Amplifier
10-500 MHz Wideband RF Amplifier 2008-10-28 02:11:01 This RF amplifier circuit is suitable for the frequencies between 10MHz and 500MHz. These kind of amplifiers are called wide band amplifiers. Wideband
amplifiers are used in communication receivers, RF measuring equipment and tons of other devices.
The RF power amplifier circuit described here uses a state of the art transistor to get maximum performance at high frequencies. It can be used as a l Read more:Amplifier
60W Linear Amplifier with IRF840 2008-10-28 02:06:15 This is a RF Linear
amplifier for QRO using power mosfet IRF840 with power out 60 Watts. It's simple all solid state circuit. The IRF series of power transistors are available in various voltage and power ratings. A single IRF840 can handle maximum power output of 125 watts. Since these transistors are used in inverters and smps they are easily available for around Rs: 20/-.
The IRF840 linear amp Read more:Amplifier
Designing RF Probes 2008-10-12 18:13:53 This circuit is an RF probe that is used to directly measure the level of RF voltage present at a particular point and is one of the most useful test instrument in the hands of the home brewer. This RF Probe is normally used with a digital multi meter to indicate the voltage level as dc voltage which is equivalent to the RMS value of the RF voltage being measured.
However, the level of RF voltag Read more:Designing
Recommend Site To A Friend
