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30-Meter QRP Transmitter for Morse Code

30-Meter QRP Transmitter for Morse Code

This transmitters intended purpose is for morse-code only in the 30 meter band (10Mhz). It is a low-power QRP type and needs to be connected to your existing tranceiver. The harmonic rejections on the prototype were measured at 40dB on 20Mhz and 50dB on 30Mhz.

http://www.uoguelph.ca/~antoon/circ/30m.htm

No power supply AM transmitter

No power supply AM transmitter

This needs no power supply. It is operated only by the voice power.

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

AM modulated CW transmitter

AM modulated CW transmitter

1MHz CW signal is oscillated by feedback oscillator. And this signal is modulated by audio oscillator. Radio frequency is changed by 1500pF. Audio frequency is changed by 0.022uF

http://www.intio.or.jp/jf10zl/a2tx.htm

AM Transmitter

AM Transmitter

This circuit is deliberately limited in power output but will provide amplitude modulation (AM) of voice over the medium wave band.

http://www.zen22142.zen.co.uk/Circuits/rf/amtx.htm

Micro Power AM Broadcast Transmitter

Micro Power AM Broadcast Transmitter

74HC14 hex Schmitt trigger inverter is used as a square wave oscillator to drive a small signal transistor in a class C amplifier configuration

http://ourworld.compuserve.com/homepages/Bill_Bowden/page6.htm#amtrans.gif

1930s Rack Transmitter

1930s Rack Transmitter

W0HIO has this neat old 40m AM rack that is ready to be restored. Lots of interesting pictures.

http://www.qsl.net/ab0cw/30srack_tx.htm