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VHF/UHF TV Modulator
Posted on Thursday, October 7, 2010   •   Category: FM Transmitters


Simple oscillator that generates a frequency in the VHF or UHF region. The oscillator 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 TV to the correct frequency.


UHF-TV Preamplifier
Posted on Thursday, October 7, 2010   •   Category: Antennas




0.1 - 3.5GHz Prescaler
Posted on Thursday, October 7, 2010   •   Category: FM Transmitters


This handy prescaler divides input frequency by 1000. It takes maximum input frequency of 3.5GHz and converts it into 3.5MHz that may be measured using standard frequency meter.


15dB UHF TV Antenna Booster
Posted on Thursday, October 7, 2010   •   Category: Antennas


This is an UHF band TV antenna preamplifier circuit With 15dB gain to build easily. It is formed based on BF180 UHF Transistor. The first stage is an band pass filter constructed by the C1, CV1, L1, L4, C7 and C3, the second stage is a base-common voltage amplifier with low input impedance to match. Build the L1 ~ L4 as air core coil to obtain high Q-Factor. After assembling, pack it into a proper metallic box and connect the ground of the circuit to the box to reduce noise effect.


25W RF Amplifier
Posted on Wednesday, October 6, 2010   •   Category: FM Transmitters


RF amplifier with 25W of power for 88-108MHz FM transmitters.


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