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HF Propagation


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70cm Projects - Transmitters

Click to enlarge432 MHz TX by LY3LP
Used the fundamental harmonic 24MHz quartz.Multiplied by the apperance of 432MHz . TX easily reapyted, uncritical.

Click to enlarge432MHz - 144MHz mini beacon by LY3LP
On 144 MHz it is heard well within 4 meters distance. 432MHz beacon is heard good about 30cm. For easy converters/receivers testing.

Click to enlarge433 Mhz TX by LY3LP


Click to enlarge434,2 MHz TX by LY3LP


Click to enlarge434MHz SAW generator by LY3LP
434MHz SAW generator with ERA 3.

Click to enlarge435,9 MHz FM mini beacon by LY3LP


Click to enlargeexperiment of 1transistor TV transmitter by JF1OZL
I will show you a simple TV transmitter. But this is planned only for experiment. You can not make TV station with such a simple circuit. And experiment of this gear makes some interference for TV.

Klik voor vergrotingORP/p 433 MHz NBFM tone, CW , SAW TX by LY3LP


Click to enlargeSimple 430 FM TX by JF1OZL
This is a very simple 430MHz band FM transmitter. This transmitter uses only 2 FET-transistors. Oscillator unit makes 16MHz signal with its crystal. The oscillating frequency is changed by Varicap diode.

Click to enlargeUHF signal-generator by JF1OZL
One day, as a next step of my hand make activity, I decided to make 430MHz transceiver. 430MHz transceiver includes some 430MHz amplifier. To tune these amplifier and band pass filter, I need UHF signal generator.

Creation date : 16/08/2007 @ 18:57
Last update : 19/03/2020 @ 22:51
Category : 70cm Projects
Page read 25702 times

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