Radio Transmitter 6Watt MicroStripline 2SC1971

2SC1971 8 Watts FM broadcast (87,5-108MHz) broadband microstripline RF-amplifier

1.- all SMD components are 1206 types
2.- connect the bottomlayer (groundplane) on several points (through via's) with the
    toplayer of the pcb. THIS IS VERY IMPORTANT!


VCC = Supply voltage (see also the 2SC1971 datasheet)

CuL = magnetwire, enameled copper wire
(Note:      1 mm equals approx. to #18 A.W.G
    0.8 mm equals approx. to #20 A.W.G
    0,3 mm equals approx. to #28 A.W.G.)

(I)   all diameters are measured from the inside of the coils, i.e. 'internal' diameter.
(II)  make sure to mount the rf-transistor on a appropriate heatsink and use some thermal
      heatsink compound between the flange of the transistor and heatsink!
      (Thermal resistance heatsink at least 6°C/W.)
(III) all parts are soldered directly on the toplayer of the pcb.

(C)2005 Helix Inc. The Netherlands.

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What is Transmitter?

What is transmitter?
A transmitter is an electronic device which propagates an electromagnetic signal such as radio, television, or other telecommunications. It is usually with the aid of antenna.

Transmitter Types
In radio electronics and broadcasting, a transmitter usually has a power supply, an oscillator, a modulator, and amplifiers for audio frequency (AF) and radio frequency (RF). The modulator is the device which piggybacks (or modulates) the signal information onto the carrier frequency, which is then broadcast. Sometimes a device (for example, a cell phone) contains both a transmitter and a radio receiver, with the combined unit referred to as a transceiver. A common consumer electronics device is a Personal FM transmitter, a very low power transmitter generally designed to take a simple audio source like an iPod, CD player, etc. and transmit it a few feet to a standard FM radio receiver. In the USA, most personal FM transmitters fall under Part 15 of the FCC regulations to avoid any user licensing requirements.

In amateur radio, a radio transmitter can be a separate piece of electronic gear or a subset of a transceiver, and often referred to using an abbreviated form; "TX" or "XMTR".

In industrial process control, a "transmitter" is any device which converts measurements from a sensor into a signal to be received, usually sent via wires, by some display or control device located a distance away.

Generally and in communication and information processing, a transmitter is any object (source) which sends information to an observer (receiver). When used in this more general sense, vocal cords may also be considered an example of a transmitter.

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