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UHF (Ultra High Frequency) Circuits Last Updated on:
Monday, October 03, 2011 06:08 PM
Circuits Designed by Dave Johnson, P.E. :
200MHz400MHz VOLTAGE controlled OSCILLATOR
If you need a clean emitter coupled logic (ECL) type signal between 200MHz and
400MHz this circuit works fine. It uses four voltage-controlled capacitors to change
the frequency.
Links to electronic circuits, electronic schematics, designs for engineers,
hobbyists, students & inventors:
200MHz400MHz VOLTAGE controlled Oscillator
- If you need a clean emitter
coupled logic (ECL) type signal between 200MHz and 400MHz this circuit works
fine. It uses four voltage-controlled capacitors to change the frequency.
(designed by Dave Johnson)
UHF TV PreAmplifier - This circuit is designed to work at UHF frequencies
in the range 450-800MHz. It has a gain of around 10dB and is suitable for
boosting weak TV signals….(schematic added 9/02)
VHF/UHF Prescaler - The recommended Prescaler is ridiculously simple. It consists
of just one IC, a TV tuner prescaler, the Philips SAB6456A, which can divide by 64 or
by 256. This chip is widely available both new and in the surplus market at much lower
prices than conventional divide by 10 prescalers. (added 08/08/08)
VHF/UHF TV Modulator - 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.
