Owner: Electronic Transmitter Guide URL:http://fmtvguide.blogspot.com/ Join Date: Tue, 17 Jun 2008 10:35:51 -0500 Rating:0 Site Description: More information about AF and RF Design, Schematic, Circuit Board (PCB) and Datasheet Site statistics:Click here
Stereo Compressor Limiter with Clipper for FM Broadcast 2008-07-22 08:15:23 This application circuit is stereo audio compressor limiter with clipper for processing your FM audio signal. Limiter is a device, which weakens loud signals and intensifies silent signals. On its output there is signal with constant level. Signal clipping on the limiter output allows to increase the signal level without exceeding maximum frequency deviation limit 75 kHz. It's very suitable since Read more:Stereo
, Compressor
, Clipper
, Broadcast
FM Bandpass Filter 97.5 MHz 2008-09-04 12:51:14 This type of filter circuit is a bandpass filter for FM band 88-108 MHz. This bandpass filter is in fact a combined highpass and lowpass filter. The first stages are a highpass and the last stages a low pass. We ripped it out the newsgroup alt.radio.pirate too bad, we can't remember who posted it. We tested the schematic with a simulation in MicroSim PSpice A/D Analog/Digital Simulator, Version 6. Read more:Filter
Tunable Dipole Antenna For FM Broadcast 2008-08-30 01:20:20 This is a simple dipole antenna for FM broadcast. It can be tune for 88-108 MHz frequency range. It's very clear and easy to build. For more gain it can be stacked (2 or 4 antennas and used power divider for distributing RF energy)
How to construct:
Solder all copper pieces before attaching to the 1/2[inch] plastic T.
The aluminum tubing is attached to the copper fitting with 2 self-tapping #6 s Read more:Antenna
, Broadcast
VHF Video Transmitter 60-200 MHz 2008-09-23 04:32:25 Here's a simple video transmitter for VHF TV channel will accept baseband video input, hence it can be driven by most CCD cameras and VCR video outputs. It ouputs roughly 80mW and when used with a 40cm telescopic antenna over 100 metres range is possible.
The transistor of the video transmitter can be a BC108, BC546, BC337 or a 2N2222. L1 is wound on a 10 mm air former. Use 6 turns 24 SWG for fr Read more:Transmitter
Designing a Combiner for VHF/UHF 2008-09-29 23:37:36 Here's is one way of combining several antennas on VHF/UHF is by using a power combiner (or power splitter if you prefer to look at it from that angle). Using the principle of impedance transformation in a quater wavelength transmission line, a proper matching can be made between antennas and the downlead cable.
To build a RF combiner you need to design a coaxial quaterwave line, having a caracte Read more:Designing
30W VHF FM Amplifier BLF245 2008-10-29 18:39:05 This FM amplifier has been designed to take place on a heatsink microprocessor PC equipped with its fans, the advantage of this method of cooling has been selected for the fact that it is not very common and expensive. The Power out of the VHF FM amplifier can be achieved by 30 Watt.
The size of the printed circuit of the amplifier will adapt quite easily to the type of heatsink as you have avai Read more:Amplifier
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