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What is Transmitter Hunting? 2008-04-09 12:28:19 Transmitter Hunting (known as T-Hunting, Fox Hunting, Radio Direction Finding) is a popular activity among Amateur Radio operators where a transmitter is actually hidden somewhere and "hunted down" (found) using radio direction finding techniques! The transmitter is usually on the air intermittently, and identifies either in Morse code or voice automatically.Amateurs participating in transmitter hunts usually start at a common start point, and the fun begins!When the transmitter is on the air, the hunters "take bearings" using directional antennas by determining the direction where the signal is the strongest.This is done throughout the hunt until the transmitter is found!First, to put a rumor to rest, you do not need expensive equipment for transmitter hunting! All you need are three thin Read more:Transmitter
What is Transmitter? 2008-04-09 12:27:59 What is transmitter?A transmitter is an electronic device which propagates an electromagnetic signal such as radio, television, or other telecommunications. It is usually with the aid of antenna. Transmitter
TypesIn radio electronics and broadcasting, a transmitter usually has a power supply, an oscillator, a modulator, and amplifiers for audio frequency (AF) and radio frequency (RF). The modulator is the device which piggybacks (or modulates) the signal information onto the carrier frequency, which is then broadcast. Sometimes a device (for example, a cell phone) contains both a transmitter and a radio receiver, with the combined unit referred to as a transceiver. A common consumer electronics device is a Personal FM transmitter, a very low power transmitter generally designed to take a s
AM FM Radio Spectrum and Frequency 2008-04-09 12:23:31 SpectrumFM radio works the same way that AM radio works. The difference is in how the carrier wave is modulated, or altered. With AM radio, the amplitude, or overall strength, of the signal is varied to incorporate the sound information. With FM, the frequency (the number of times each second that the current changes direction) of the carrier signal is varied.FM signals have a great advantage over AM signals. Both signals are susceptible to slight changes in amplitude. With an AM broadcast, these changes result in static. With an FM broadcast, slight changes in amplitude don't matter -- since the audio signal is conveyed through changes in frequency, the FM receiver can just ignore changes in amplitude. The result: no static at all.Frequency
The Amplitude Modulated (AM radio) carrier freque Read more:Radio
, Spectrum
Privacy Policy 2008-04-09 06:57:56 Privacy Policy
for Trasnmitter Palace Blog.If you require any more information or have any questions about our privacy policy, please feel free to contact us by email at transpalace@telkom.net.At Trasnmitter Palace Blog, 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 Trasnmitter Palace Blog and how it is used. Log FilesLike many other Web sites, Trasnmitter Palace Blog 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 demo Read more:Privacy
, Privacy Policy
Audio Video Wireless Transmitter 2008-04-16 20:31:53 In this fast-paced world, there is little time for inconveniences and a greater need for portability and adaptability. The idea for an Audio
/Video transmitter stems from this need. There may have been times when you've wanted to hook up your VCR from one room to another television set in another room. But that would have entailed that you first unhook all kinds of wires and plugs from the primary TV set; carry the VCR to the next TV set; and then finally re-wire everything together. An Audio/Video transmitter will let you do just about the same thing. But it would offer other conveniences as well. For example, it would allow you to set up security cameras around your home which would send video signals directly to a TV or VCR. And, there are no cumbersome wires and cables to line throughou Read more:Wireless
, Transmitter
Miniature Telemetry Transmitter 2008-04-19 06:43:25 Telemetry or "remote measurement" is a highly automated communications process by which measurements are made and other data collected at remote, inaccessible or dangerous places, and then relayed by a telemetry transmitter to receiving stations for display, monitoring, and recording. The original telemetry systems were termed "supervisory" because they were used to monitor electric power distribution. Communication channels form a major part of any telemetry system, as it involves measurement of the transmission of data over various mediums.Telemetry transmitter is the instrument used for recording the readings of an instrument and transmitting them by radio or wireless frequencies. Technically, when relaying data, it is necessary for the transmitter to identify the data item correspondin Read more:Transmitter
RF Filters 2008-04-19 02:26:21 An RF filter is an electrical circuit configuration (network) designed to have specific characteristics with respect to the transmission or attenuation of various frequencies that may be applied to it. There are three general types of RF filters:A high pass filter similarly has a cut-off frequency, above which there is little or no loss in transmission, but below which there is considerable attenuation. Its behavior is the opposite of that of the low-pass filter.A low pass filter is one that will permit all frequencies below a specified one called the cut-off frequency to be transmitted with little or no loss, but that will attenuate all frequencies above the cut-off frequency. High-pass and low-pass filters can be difficult to construct properly. Whenever possible, many amateurs simply bu Read more:Filters
RF Power Amplifier 2008-04-19 02:13:32 An RF power amplifier is a type of electronic amplifier used to convert a low-power radio-frequency signal into a larger signal of significant power, typically for driving the antenna of a transmitter. It is usually optimized to have high efficiency, high P1dB compression, good return loss on the input and output, good gain, and good heat dissipation.Wideband amplifier designtransformations over large bandwidth are difficult to realize, thus most wideband amplifiers use 50 Ω output loading. Transistor output power is then limited toVbr is defined as the breakdown voltageVk is defined as the knee voltage and Read more:Amplifier
, Power Amplifier
Miniature Telemetry Transmitter For Small Bird 2008-04-24 07:35:22 IntroductionThe goal of this project was to build a small, cheap, light-weight telemetry transmitter to attach to a small bird.Specifically:* Telemetry Tranmission should be tuned to the 2-meter band.* Battery life in the field should exceed 3 months without replacement.* Range should be 500 meters.* Weight less than 10 grams.The CircuitThis wireless telemetry transmitter circuit shown was originally designed by William Cochran (1), with modifications by Charles Walcott.Reference1. William W. Cochran; Rexford D. Lord, Jr., A Radio-Tracking System for Wild Animals,The Journal of Wildlife Management, Vol. 27, No. 1. (Jan., 1963), pp. 9-24. Read more:Transmitter
, Small
Video RF Transmitter 2008-05-05 15:20:05 This Circuit is Video RF Transmitter
converted baseband video to TV RF in VHF High and UHF band. If the frequency want to change between VHF and UHF band change the coil value. In this video RF transmitter circuit only video signal as input to modulated and if it want to modulate audio signal, can be modulated as FM.This circuit is a powerful video sender in VHF band. The video modulator section is designed to operate on either channels 7 to 13 or 14 to 29. For channels 7 to 13, L1 and L2 are 3 turns of #22 wire wound on a 3/16 inch form. For channels 14 to 29, L1 and L2 are 2 turns of #22 wire wound on a 3/16 inch form. Video signal is modulated as AM.
Audio Video RF Modulator 2008-05-05 15:07:35 The circuit of audio video RF Modulator presented here is a simple audio video transmitter with a range of 3 to 5 metres. The AV signal source for the circuit may be a VCR, a satellite receiver or a video game etc. A mixer which also operates as an oscillator at VHF High channel 5 TV frequency is amplitude modulated by video signal and mixed with frequency mo enna, contains video carrier frequency of 175.25 Mhz and audio carrier frequency of 180.75 Mhz. Then, the transmitter is a PAL B-System of CCIR compatible.The circuit of audio video modulator consists of transistor Q1 with its resonant tuned tank circuit formed by inductor L1 and trimmer capacitor VC1, oscillating at VHF High channel 5 frequency. Transistor Q2 with its tuned circuit formed using SIF coil and inbuilt capacitor forms o Read more:Audio
Audio Video Modulator 2008-05-04 13:46:20 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.
What is an Oscillator 2008-05-06 15:39:51 An oscillator is a mechanical or electronic device that works on the principles of oscillation: a periodic fluctuation between two things based on changes in energy. Computers, clocks, watches, radios, and metal detectors are among the many devices that use oscillators.A clock pendulum is a simple type of mechanical oscillator. The most accurate timepiece in the world, the atomic clock, keeps time according to the oscillation within atoms. Electronic oscillators are used to generate signals in computers, wireless receivers and transmitters, and audio-frequency equipment, particularly music synthesizers. There are many types of electronic or RF oscillators, but they all operate according to the same basic principle: an oscillator always employs a sensitive amplifier whose output is fed back
How does Radar Work 2008-05-11 01:53:24 A radar can tell where things are and how fast they are moving. How does it do this? It works very much like a radio or TV station. Consider two radio stations located on a mountain transmitting to a nearby city. Why is it that you can listen to either one and they do not interfere with each other? They transmit on different frequencies; that is, their waves vibrate at different frequences. A spec Read more:Radar
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