Radio Frequency Modulator and Demodulator

Electronics Infoline Web

VHF / UHF TV Modulator

Elektor January 1985

http://members.tripod.com/~petlibrary/rfmod.htm

RF Modulator

http://www.web-ee.com/Schematics/RF_Modulator/rf_modulator.htm

TV Modulátor

http://koumes.misto.cz/_MAIL_/navody/tvmodulator/tv.html

AV -modulaattori kameralle ja elektreettimikrofonille

audio/video modulator for PAL system operating at around 55 MHz frequency. It takes in composite video (from video camera) and audio from electret microphone. This circuit include circuit board plans.

http://www.spelektroniikka.fi/rfirkytkis.htm

PIC16F84 CW decoder

http://digilander.libero.it/ik3oil/_private/qst_cw.pdf