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PEMANCAR FM 12 WATT UNTUK NGEBRIK

 Oleh: Arif Johar Taufiq

 

An FM transmitter is a portable device that plugs into the headphone jack or proprietary output port of a portable audio or video device, such as a portable media player, CD player, or satellite radio system. The sound is then broadcast through the transmitter, and plays through an FM broadcast band frequency. Purposes for an FM transmitter include playing music from a device through a car stereo, or any radio.

The FM-transmitter plugs into the audio output of audio devices and converts the audio output into an FM radio signal, which can then be picked up by appliances such as car or portable radios. Most devices on the market typically have a short range of up to 30 feet (9 meters) with any average radio (up to about 75 feet (23 meters) with a very good radio under perfect conditions) and can broadcast on any FM frequency from 76.0 to 108.0 MHz (or 88.1 to 107.9 in the US). Some lower-cost transmitters are hard-wired to the 87.7-91.9 MHz band allocated to educational broadcasts in the United States, or a certain other smaller range of frequencies.

FM transmitters are usually battery driven, but some use the cigarette lighter socket in cars, or draw their power from the device itself. They are typically used with portable audio devices such as CD or MP3 players, but are also used to broadcast other outputs (such as that from a computer sound card) throughout a home or other building.

  • The relatively low power output of FM transmitters sometimes makes it unsuitable for use in some large urban areas because of the number of other radio signals. This is compounded by the fact that strong FM signals can bleed over into neighboring frequencies making the frequencies unusable with the transmitter. Removing a car's radio antenna has been found to significantly improve transmitter reception.
  • Some models which connect via ports other than the headphone jack have no means of controlling the volume, which can force the sound to transmit out from the device harshly (causing over modulation, audio distortion and possible radio interference), or too low. In theory a device could use an automatic level control or audio limiter circuit to overcome this problem although there are few (if any) devices with such a facility available out on the market yet.

 

Proyek ini adalah proyek masa lalu dijaman masih jadi kuliah tahun 94an yang suka ngoprek elektronik. Dari gaul di udara lewat pemancar FM akhirnya dapat skema pemancar FM 12 W dari teman on air (Juragane Mbako dari pwt yg suka  Djarum 76), cukup simpel tapi dapat dipakai ngebrik sampai puluhan KM. Gambar skema lengkap versi protel download disini Kebutuhan tegangan 12V/5A. Antena dapat memakai 1/2 dipole, ground plane, gamma match atau lainnya dengan kabel merek Belden impendans 50 ohm. Untuk pendingin transistor C1971 PCB dilubangi sehingga transistor langung di mounting ke box atau pendingin. Bodi transistor C1971 adalah emitor yang berhubungan dengan ground.

 

 

 

 

 

 

 

 

 

 

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