Con tan sólo dos transistores trabajando en paralelo se logra esta etapa de salida que provee una potencia total de 360 vatios con tan sólo 40 en su entrada.

El centro de este proyecto son dos transistores de potencia de RF de la firma Philips Semiconductors BLX15, funcionando en configuración paralelo. Las únicas tres resistencias del sistema deben ser de 10 watts y de carbón, ambos transistores deben estar debidamente disipados a fin de no sobrecalentarse.

Todas las bobinas marcadas como BI sin del tipo impresas, las cuales están dibujadas en la plaqueta por medio de pistas de cobre. RFC (uno en cada base) son choques de RF convencionales. CH es una bobina de 2 vueltas de alambre 1.5mm sobre ferrite para choques. Las bobinas L (una en cada colector) están formadas por 3 vueltas de alambre 1.5mm sobre aire de 9mm.

El ajuste de esta etapa se realiza de izquierda a derecha, desde la entrada hacia la salida, con carga fantasma de ser posible.

Aquí está en escala real el diseño del circuito impreso el cual debe ser de doble cara (la otra debe ser completamente cobre) y en material epoxy.

Los componentes se colocan siguiendo la siguiente guía:

Una vez armado y calibrado el módulo puede ser colocado dentro de un gabinete (preferentemente metálico). Es muy recomendable montar la fuente de alimentación en el interior del mismo gabinete a fin de minimizar la absorción de ruidos.

Dada la potencia (en nuestro caso) decidimos dotar a la unidad de potencia de ventiladores eléctricos. El circuito se alimenta con 50 volts y 7 ampers (casi nada).

Use RD06HVF1, RF input max 10dbm, RF output 37dbm. 12V DC

http://www.elecsky.com

Electric current : < 6A

Frequency Range: 75MHz ~ 110MHz (maximum 50MHz ~ 110Mhz)

Bandwidth: 35MHz

Input Power: ≤ 1 Watts （1.5 watts maximum input）

Output power: 150 watts (adjust input power, output power can change the size).

Harmonic Suppression： -65 dB

Power Flatness：< 1 dBm

Working ambient temperature：-20℃～50℃

Working methods: continuous work

PCB Size: long 100mm x wide 180mm x thick 15mm 

From:elecsky.com

40-80MHZ FM Transmitter amplifier, Use 8pcs RD01MUS1 power synthesis.

input power 1Watt, output power 8Watt.

From: www.elecsky.net  www.elecsky.com

150Watt FM transmitter power amplifier board Test , From www.elecsky.com

A amplifier of force RF for the FM, is always essential for the amateur that wants it strengthens some small transmitter, that likely already it has manufactured or has been supplied ready. The present circuit can give 50-60W RF force of expense, with control smaller than 15-20W in the region of frequencies of FM, that is to say in the 88-108MHZ. Transistor that we selected for this manufacture is the BLY90, that has gain 5dB. Description

As it appears in the analytic drawing (image 1) the amplifier is manufactured with transistor TR1, type BLY90 of Philips. The transistor this is specifically drawn for operation in frequencies up to 175MHZ, with very good results of linearity and record of force. In his technical' characteristics they are included the tendency of operation in the 12V the current of collector in the gain expense in the 5dB (measured in order C) and force of entry in the 16W. Variable capacitors C1, C2, with inductor L1, constitute the circuit of co-ordination, that adapts the exit of our transmitter in amplifier RF. This circuit has been calculated suitably, so that it covers all band the FM with the biggest possible output. Inductor RFC1 polarized the transistor, so as to it works in order C, that is to say with the biggest output. Inductor L2 in the collector of TR1, constitutes the charge of amplifier, while RFC2 prevents the RF signals leak  in the line of catering. Capacitor C2 and resistance R1, protect the circuit from auto polarization. The coordinated circuit of expense that is constituted by inductor L2 and variable capacitors C3, C4, adapts the exit of amplifier RF with the next stage, which can be constituted from some amplifier RF of high force (> 300W) or a aerial. This circuit can be supplied with 12V f.e from the battery of one automotive, so that it renders the system emitter portable. Thus, easily it can be moved in points with bigger altitude, in order that from there are achieved radio transmissions, something that was also got used in the past by romantic amateur of radio band.

The manufacture

The manufacture of amplifier, is very simple and easy, it is enough to look the images 3 and 2 that portray pcb the amplifier and the placement of materials in this. Puncture the point pcb, that pass the nutshell of TR1. Sticks the capacitors, variable, the resistance, RF tsok and the inductors. Finally you stick TR1, being careful not overheating at the welding and bend  the pins his. Clean finally pcb from the residues of iron. Make a very careful control for by any chance errors, omissions, short-circuits, chills you stick also anything other that could you make think that will not work the amplifier.

If all they are it includes, you connect the exit of your transmitter (15-20W) in input the amplifier. The exit of amplifier him you will connect in some charge (dummy load) or in the aerial, through bridge stagnant waves. Supply with tendency 11-15V your amplifier (power supply it should gives current 4-5A). Regulate the 4 variable C1-C4, until you take the biggest force of expense. The amplifier is ready.

Parts

C1-C4 = 10-80pF	L1 = 1 coils of diameter of 10mms, 1mm
C5 = 10nF	L2 = 7 coils of diameter of 10mms, 0,8mms
C6 = 1000pF	L3 = 3 coils of diameter of 10mms, 1mm
C7 = 100nF	TR1 = BLY90
C8 = 2200mF/35V

A amplifier of medium force RF for the FM, is always essential for the amateur that wants it strengthens some small transmitter, that likely it has already it manufactured! The present circuit can give force 25-30W, with control no bigger than 4-5 W.  As it appears in the analytic drawing, the amplifier is manufactured with the transistor TR1 of type ΒLY89 of Phillips. The transistor this is specifically drawn for operation in frequencies up to 175Μhz, with very good results. His special characteristics appear below:

·Tendency of operation: 18V
·Current of Collector:  max 3 5th
·Gain:  max 10dB
·Force of Expense: 25-30 W
·Output (order  C): > 60%

Variable capacitors C1, C2, with inductor L1, constitute the coordinated circuit that adapts the exit of our transmitter in this amplifier RF. the circuit has been calculated suitably, so that it covers all band the FM with the biggest possible output. Inductor RFC1 polarize the transistor, so as to it works in order C that is to say with the biggest output. Inductor L2 in the collector of TR1, constitutes the charge of amplifier, while RFC2 prevents the RF signals escape in the line of catering. Capacitor C2 and resistance R1, protect the circuit from auto polarize.

The coordinated circuit of expense that is constituted by inductor L2 and variable capacitors C3, C4, adapts the exit of amplifier RF with the next stage that can be some amplifier RF of high force (> 100W) or a aerial.

 MANUFACTURE 

The manufacture of amplifier is very simple and easy. Puncture the point PCB that will pass the nutshell of TR1. Stick the capacitors, variable, the resistance, the RF tsok and the inductors. Finally you stick the TR1, being careful not overheats at the welding and blend pin his. Clean finally PCB from the residues of soldering. Make a very careful control for by any chance errors, omissions, short-circuits, chills you stick also anything other that could you make wonder why does not work the amplifier.  

PARTS

C1, C2, C3, C4 = 10  – 80pF
C 5 = 10nF
C6 = 1000pF
C7 = 100nF
C8 = 2200mF/35V
L1 = 1  coil with diameter of 10 mms, 1 mm
L2 = 7  coils with diameter of 10 mms,  0,8 mm
L3 = 3  coils with diameter of 10 mms, 1 mm
TR1 =  BLY89
RFC = RF  tsok

If all they are it includes, you connect the exit of your transmitter (3-4W) in the entry of amplifier. The exit of amplifier him you will connect in some charge (dummy load) or in the aerial, through a bridge stagnant. Be supplied with tendency 11-15V your amplifier. (Power supply it should it provides current 45th). Regulate the 4 variable (C1-C4, until you take the biggest force of expense. The amplifier is ready.

Note: The TK1 needs a wiper of dimensions 5x10cm for trouble free operation. This wiper screw in the TR1 without isolators, after his central screw has electric isolation from remainder pins.

2SC2630 30-60 Watt FM Broadcast RF Amplifier

2SC2539 15 Watt FM Broadcast RF Amplifier, Use 2sc2539, input 2watt, output 15watt.DC+13.8V

L1: 2T  Coil diameter:4mm

L2: in series 6pcs Toroidal ring

L3: 4T  Coil diameter:10mm

L1: 3T  Coil diameter:10mm