The series output transistor is a VHF power transistor. It has flat response out past 20 MHz, less than 1 percent total harmonic distortion, and does not generate significant levels of IMD. The results show an emission bandwidth greater than 18 MHz at -38dbc levels. use of a Mirage D24 solid state power amplifier after the transceiver served to increase the bandwidth of the transmitted signal even further.
http://www.qsl.net/kd2bd/modulator.html
used for generating a high quality FM stereo multiplex signal that is suitable for driving mono FM transmitters.
http://www.solorb.com/elect/fmst/
http://www.web-ee.com/Schematics/PWM/pwm.htm
http://www.mrs.bt.co.uk/dubus/8402-3.pdf
simple and useful circuit used to monitor on air transmission of your low power amplitude modulated transmitter
http://www.flashwebhost.com/circuit/modulation_monitor.php
-sideband (SSB) modulation uses the frequency spectrum and generates output power more efficiently than does full-amplitude modulatio, generates generates 35- to 80-MHz SSB signals by combining wideband, low-voltage op amps with an IC that integrates all
http://www.edn.com/archives/1997/060597/12di_02.htm
http://www.web-ee.com/Schematics/FSK%20Modulator/FSK_Mod.htm
Elektor January 1985
http://members.tripod.com/~petlibrary/rfmod.htm
for ATV application
http://f1buy.club.fr/realisations/emetteur23/Partie%20son%206%20ou%206.htm
Build this simple and cheap 70 MHz Exciter and start to transmit Digital Television
http://perso.wanadoo.fr/jf.fourcadier/television/exciter/exciter_e.htm