OMB EM 100 DIG - Page 50

FM Transmitter
Sistemas Electrónicos S.A EM 100 DIG
Technical Manual - v1.2 - November 2005 46
The output transistors capsule is a rugged device which easily could pass the nominal 100W power
output, even increasing this power output out of limits, to 300W. OMB suggests never exceeding 250
~ 270W output power, even when the transmitter could generate more than this.
FM 300W Power Amplifier
DESCRIPTION REFERENCE QUANTITY
Cap. 33pF SMD 1206 100V C1 1
Cap. 470pF SMD 1210 5% 200V NPO C2, C11-C14 5
Cap. 1nF SMD 1206 100V C3-C6, C16,C20 6
Cap. 150pF 100V Ceramic C7,C8 2
Cap. 100uF SMD t50V Electrolytic
C15 1
Cap. 22nF SMD 1206 200V Ceramic X7R C17 1
Cap. 47pF SMD 1210 5% 500V C17 C18 1
Cap. 15pF SMD 1210 5% 500V C17 C19 1
Diode BAT54 SMD SOT-23 D1,D2 2
Zener diode 10V SMD 0.35W D4 1
Thread 0.8mm Cu-Ag 30mm. approx.
Material for L1 and TR2 fixing
Thread 1mm Cu enamelled 250mm. approx.
Material for L2
Thread 1.5mm Cu-Ag 50mm. approx.
Material for L5 and TR1 fixing
Axial ferrite L3,l4 2
Output transformer core L5 1
22: SMD 1206 1/4W
r2,r3
2
Potentiometer 1turn 1K 3/8” R4 1
Metal 1 : / 2W L=12mm =3.9mm
Non-inductive
R5
1
Res. 10: SMD 1206 1/4W
R6-R9
4
Res. 10: Coal 2W L=16mm =5.5mm Non-inductive
R10
1
Res. 330: SMD 1206
R11
1
Res. 110: SMD 1206
R12
1
Res. 1K8: SMD 1206
R14
1
Res. 10: SMD 0805
R15
1
Output Transformer TR1 1
Input Transformer TR2 1
Connection terminals tab 2.8x0.5 CON1,CON2 2
Female-female hex. separator 10mm Brass-Nickel CON3 1
MOSFET, N 108MHz 300W SALD BLF278 Q1 1