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UHF Antenna Amplifier Circuit
This amplifier circuit is used to amplify TV signals in UHF range. It uses a low-noise transistor and gives 10 to 15 dB amplification in the frequency range from 400 MHz to 850 MHz. The transistor must be shielded from the input components and in constructing this circuit, the wirings must be as short as possible. For best results, the cable must
FM Antenna Amplifier Circuit
With this technique, an extra cable to power the fm antenna amplifier is unnecessary. The RF signal and the DC current supplying the amplifier use the cable simultaneously. Check another FM antenna booster circuit diagram. The RF signal is however prevented by LC filters from flowing into the power supply. The amplifier works with either 50 ohm...
VHF FM Antenna Booster Circuit
Together with a good directional antenna this high performance two-stage antenna amplifier for the VHF FM broadcast band will enable you to capture far removed (DX) stations. Alternatively, it will drastically improve reception of FM signals you`ve come to accept as marginal and noisy in your area. Together with a good directional antenna this hig
FM Radio Receiver Antenna Booster Circuit
This inexpensive FM radio receiver antenna booster uses the BF324 TO92 style pnp transistor in a grounded-base configuration. The circuit may be used as a..
Radio Receiver Antenna Amplifier
Here is a high performance radio receiver antenna amplifier for the entire VHF broadcast and PMR band (100-175 MHz) which can be successfully built without..
Wideband Active Antenna Circuit
A 30 to 50 cm whip antenna provides reception from 10 MHz to over 220 MHz. T1 BF981, a dual-gate MOSFET, provides low noise, high-input impedance and high..
Active Antenna for Medium Wave
This circuit is designed to amplify the input from a telescopic whip antenna. The preamplifier is designed to cover the medium waveband from about 550Khz to 1650Khz. The tuning voltage required is 1 to 12 volts and can be obtained from a 10k potentiometer connected to the 12 Volt power supply. RV1 is the gain control allowing weak signals to be am
The K9AY receiving loop antenna
I decided to make my own K9AY antenna system and controller. Basically, after looking at the currently available commercial version, I figured I could make a better unit for less money and be happy. The basis for the K9AY antenna is that it has a steerable null. The gain around the antenna is close to unity, except for the terminated side of the...
6 x 6 Loop Antenna
This new loop antenna by Graham Maynard is his best design yet and I am proud to be the first to present his work. It uses one, six foot square, six turn loop, and is aperiodic in nature, covering the frequency range 50KHz - 5000KHz. The loop is of a size that can be mounted inconspicuously against a garden fence away from household interferences.
The ATL-3 Loop Antenna
All ATL-3 loop windings are centre tapped and balanced w. r. t. their amplifier/receiver chassis ground, and therefore electric field interference pick up tends to self cancel. Magnetic noise fields, e. g. televisions and the electric meter box, or electromagnetically radiated interferences, may be minimised by loop rotation. Where the received...
Antenna Tuning Unit
A simple passive (no power required) circuit to match an antenna to a radio receiver. This will be a useful addition to the short wave listener, but in addition a medium wave coil is almost used to tune the medium wave band. An aerial tuning unit (A. T. U. ) is a useful accessory for any radio listener as it matches the antennas resonant length...
Q- Multiplying Loop Antenna
A simple and effective short-wave antenna amplifier circuit
This amplifier is the outdoor type, line installed outdoors, the amp`s main line; Figure 2 is the indoor power line box. Indoor and outdoor use between 50 ohm or 75 ohm coaxial cable to connect. e› 3 Figure 3, Figure 4 is the amplifier circuit board, and Figure 3 is the main circuit board, the actual size is 6. 4 cm G— 2. 4 cm Figure 4 is a...
Micore Reader IC Family Directly Matched Antenna Design
How to design an antenna for the MICORE contactless reader IC family. (The MIFORE reader IC family includes the MF RC500, MF RC530, MF RC531, SL RC 400 and the CL RC 632. The antenna design and matching is the same for all of these ICs. ) For a good overview the Micore Antenna Principle section shows the blocks of each reader antenna design, how...
Antenna Circuits / Schematics
Here you can find plans for a simple ground plane antenna that works well in the FM Band (88-108MHz). It`s built of a small plastic disk 6 x 6 Loop Antenna - This new loop antenna by Graham Maynard is his best design yet and I am proud to be the first to present his work. It uses one, six foot square, six turn loop
Wide-Range Doppler Antenna
Doppler units are the "weapon of choice" among mobile T-hunters in many parts of the country. They indicate the direction of incoming VHF signals on a circular ring of light-emitting diodes or a digital display. A doppler set updates bearings almost instantaneously, so even short carrier bursts can be tracked. A doppler installation can be done...
Remote antenna for 60 kHz (WWVB) reception
Inside the outdoor box to which the loop is mounted showing the amplifier circuitry. The four capacitors visible at the lower-left corner of the perfboard are used to broadly resonate the receive loop. In the office building in which he worked (a city government building near downtown Salt Lake City) there was a conference room with a pair
Short-wave listeners often are not able to, or allowed to, install a long-wire antenna or other large dimension antenna in or around the home. In such cases, the present active antenna, intended for the frequency range 3 30 MHz, may be found useful. The author used a 1-metre long rod or brass tube with a diameter of 2 6 mm. The circuit consist
Antenna Input & Audio Lineout Adaptor For Portable Radios
Here is an idea for a simple low-cost adaptor that allows a portable FM radio (or MP3 player with FM tuner) to be connected to an external antenna and to audio equipment such as a hifi system or PC sound card. Portable FM radios and some MP3 players typically provide a 3. 5mm stereo jack socket for the headphone connection, with the shield conducto
Wideband Active Small Magnetic Loop Antenna
There are now extremely wideband software defined radios (SDR) where the wideband antenna is a natural choice. Wideband small magnetic loops (WSM loop) are used already 3-4 decades and I was curious to see what can be reached with them and to evaluate their usefulness as a wideband SDR input. The WSM loop should work in short circuit mode in...
Designing an AM/FM Active Antenna LNA Solution with the MAX2180 LNA
Reference design for an automotive antenna features an AM/FM low-noise amplifier (LNA) for active antenna modules. Article details the capabilities, features, and ease of design with an AM/FM active antenna LNA..
mobile active antenna power circuit
Hello, I am going to try some flat mobile active car atenna`s, with a Terratec Cinergy DT USB XS Diversity digital tuner. The antenna has the..
The Antenna Combiner (A3021) is an active combiner for four 50- © coaxial antenna connections. The output is a combination of the four inputs with net gain of roughly +11 dB. The A3021 is intended for use with four Loop Antennas ( A3015B ), each of which is placed in a separate faraday enclosure and receiving signals from subcutaneous transmitters
The antenna used for either receiving or transmitting is a vital element in the communication link. In most cases the antenna has a great deal to do with how well the receiver or transmitter works. Antennas are reciprocal, meaning that an antenna designed for transmitting will work for receiving. A passive receiving antenna will also work for tran
WIDEBAND ACTIVE RECEIVING ANTENNA
Matching Networks Antenna
Active FM Antenna Booster
Activ Loop Antennas
Antenna Amplifier UHF
Active Antenna Circuits
Antenna Tuner Circuits
Yagi Uda Antennas
Ultrasonic distance finder circuit
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is measured. There are three main categories of distance measurement methods in use: a) By...
Simple Metal detector circuit with CD4030
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to find something potentially valuable, hidden a few centimeters below the soil. So many...
Fully automatic watering circuit for flower pots
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This circuit comes as a solution to this problem. Depending on humidity of the pot at...
Simple deep searching metal detector circuit
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the circuit of this metal detector, it is possible to detect a metal coin in depth of 90 to...
Sub-Harmonic Bass Converter for Electric Guitars
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound, such as filtering or distortion. Instead, a frequency division system produces outputs...
Echo Depth Sounding Sonar for Boats
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the calibration of the rope. This arrangement still exists in some yachts. The big...
100W HiFi Audio Amplifier Circuit
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power supply must be symmetrical so that no electrolytic capacitors are needed at the outlet....
Plant-Pot Water Level Indicator Circuit
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower. The circuit of the device is shown in Figure 2. The water detection is made from the bottom...
Analogue Sound Preasure dB-Meter Circuit
The best human ear can capture sounds from 20Hz to 20KHz. These limits are known to be the broadest that can exist. Normally the normal limits range from 100Hz to about 13KHz and depend on the age and health of the individual. We for our measurements and to have a good accuracy we will get the limits of 20Hz to 20KHz. A sound to be heard does...
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