1km fm transmitter circuit diagram

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When I was 14 or so, I and my friend each made an FM transmitter. My one had only one transistor (BC169 c). We lived 300 m from each other and we were able to talk to each other with perfect quality. I had a simple dipole antenna that I had made, of proper calculated size, connected to my transmitter. I suspect it would have worked fine even with twice that distance.

Собирал давно примерно такую же схему. Но каждый элемент очень точно подбирал. Резистор в цепи базы генератора для установки тока. Подбирал конденсатор между эмиттером и базой по максимуму амплитуды на выходе генератора. В моей схеме стоял еще конденсатор параллельно резистору в цепи между эмиттером и плюсом питания. И самое главное, выбирал оба транзистора с максимальным коэффициентом усиления. У меня их было около 50 штук. Между усилителем мощности и антенной ставил удлинительную катушку, чтобы уменьшить длину антенны. Передатчик работал на 200 метров. Частота была стабильной, но из-за уменьшения напряжения батареи начинала медленно смещаться в большую сторону. Диапазон около 100-105 MGz. В колебательном контуре использовал конденсатор постоянной емкости - это для стабильности частоты. Но лучше использовать кварцевую стабилизацию.

From my experience, FM transmitter use only 2 transistors is not possible to send in range of 1 KM, it is possible to send in the maximum range of a one hundred meters.

I suggest using drill rod for the power rails. Artists love the stuff. It solders & welds terrific, has a bright silver finish, and is strong enough to form the base of a executive desk toy that could look real swank! Ditch the cardboard.

Rất tuyệt vời với bộ thu phát sóng xin cảm ơn đã chia sẻ với khán giả

I have built many of these years ago. So small, they snap onto a 9V battery. Crisp and clear and travels almost a mile away with 9" antennae.

Hace tiempo cuando empecé con la.electronica usaba este circuito para interrumpir la señal de radio o TV de los vecinos, solo lo hacía por diversión,luego empecé a experimentar con una mini estación de radio, buenos recuerdos

HOLA MUY BUENO EL CIRCUITO IDEAL PARA HOBBY Y CREATIVO...LO FELICITO AMIGO... GRACIAS POR COMPARTIR...

Gracias, aun cuando no se nada de electronica su estilo claro y sencillo da luces y me abrió otro ámbito de lograr éxito en medio de las carencias y dificultades desde la República Bolivariana de Venezuela un abrazo

I tested 2-transistor transmitter with full-size antenna (halfwave dipole) from balcony on 22nd floor. The distance was near 3 km. Measured output power (using oscilloscope on 50ohm load) was about 200mW with well-tuned MATCHED impedance network (pi filter). The circuit presented here uses very short antenna and no matching elements. It is capable to transmit at least for couple hundreds meters.

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You provide such great material to your viewers. I appreciate all of your hard work. I truly appreciate it!

I really enjoy these builds. They remind me of the point-to-point wiring of many tube-based circuits Ibuilt in my youth but there is also an element of art to the designs. Are they as stable, efficient or sophisticated as they could be? No, but would they be as interesting or as accessible? I think not. Keep up the good work!

Good work. But: 1 kilometer of range, with a Collpits system, 2N3904 transistor, and a 9v power supply, seems to be overselled.

Hello, I have a design for a similar fm transmitter and I learned that if you keep all the component leads as short as possible and everything as close to each other the circuit doesn’t drift from frequency as much and operates clearly. For the tank circuit I use a 5.5 to 20pf variable cap with 6 turns of 22awg wire. I will try your design as well looks very nice 👍🏻

Muy bueno Saludos desde Argentina

Ваши способности в объемном монтаже восхищают! Давно забытая технология. Даешь точечную сварку соединений!

Thanks for your video, salute from Venezuela..!

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