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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.
http://sa555.blogspot.com/2011/03/432-mhz-tx.html

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.
http://sa555.blogspot.com/2011/03/432mhz-144mhz-mini-beacon.html

Click to enlarge433 Mhz TX by LY3LP

http://sa555.blogspot.com/2009/04/433-mhz-tx.html

Click to enlarge434,2 MHz TX by LY3LP

http://sa555.blogspot.com/2010/05/4342-mhz-tx.html

Click to enlarge434MHz SAW generator by LY3LP
434MHz SAW generator with ERA 3.
http://sa555.blogspot.com/2014/02/434mhz-saw-generator.html

Click to enlarge435,9 MHz FM mini beacon by LY3LP

http://sa555.blogspot.com/2012/11/4359-mhz-fm-mini-beacon.html

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.
http://www.intio.or.jp/jf10zl/tvtr.htm

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

http://sa555.blogspot.com/2012/12/orpp-433-mhz-nbfm-tone-cw-saw-tx.html

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.
http://www.intio.or.jp/jf10zl/430TX.htm

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.
http://www.intio.or.jp/jf10zl/uhfsg.htm


Creation date : 16/08/2007 @ 18:57
Last update : 07/09/2018 @ 22:49
Category : 70cm Projects
Page read 16170 times


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