This RF power amplifier works in frequency 470 - 860 MHz UHF Band IV and V with power out 14 Watts with input power 1.5 Watts. The power amplifier is suitable for amplifying rf signal your tv transmitter with 0.5 - 2 watts power output.
Schematic
RF power amplifier circuit is taken from Philips transistor application note, as you can see below.
Part Lists:
C1 = C6 = C16 = 4,7 pF (500 V) multilayer ceramic chip capacitor
C2 = C3 = C20 = C21 = 33 pF multilayer ceramic chip capacitor
C4 = C9 = C13 = C19 = 1,2 to 3,5 pF film dielectric trimmer
C5 = C7 = C15 = C17 = 100 nF multilayer ceramic chip capacitor
C8 = C10 = C11 = C12 = 220 pF multilayer ceramic chip capacitor
C14 = C18 = 6,8 mF/40 V solid aluminium electrolytic capacitor
C22 = C23 = 1 pF (500 V) multilayer ceramic chip capacitor
L1 = L2 = L13 = L14 = Coax. 50 Ohm with diameter 2,2 mm; lenght 29,0 mm, soldered on striplines
75 W (1,1 mm ´ 28,0 mm). inner L1 dan L13 not connected
L3 = L4 = 52 W stripline (2,0 mm ´ 16,5 mm)
L5 = L8 = 470 nH microchoke
L6 = L7 = 39 W stripline (3,1 mm ´ 8,0 mm)
L9 = L12 = 1 Turn (1,0 mm); diameter 5,5 mm; lead space 2 ´ 3,5 mm
L10 = L11 = 39 W stripline (3,1 mm ´ 34,0 mm)
L3, L4, L6, L7, L10 dan L11 are striplines on PTFE fibre-glass PCB wirh dielectric (Îr = 2,74); w 1/32".
R1 = 10 W carbon resistor
Continue: Broadband RF Amplifier For TV Transmitter 14W #2
Schematic
RF power amplifier circuit is taken from Philips transistor application note, as you can see below.
Part Lists:
C1 = C6 = C16 = 4,7 pF (500 V) multilayer ceramic chip capacitor
C2 = C3 = C20 = C21 = 33 pF multilayer ceramic chip capacitor
C4 = C9 = C13 = C19 = 1,2 to 3,5 pF film dielectric trimmer
C5 = C7 = C15 = C17 = 100 nF multilayer ceramic chip capacitor
C8 = C10 = C11 = C12 = 220 pF multilayer ceramic chip capacitor
C14 = C18 = 6,8 mF/40 V solid aluminium electrolytic capacitor
C22 = C23 = 1 pF (500 V) multilayer ceramic chip capacitor
L1 = L2 = L13 = L14 = Coax. 50 Ohm with diameter 2,2 mm; lenght 29,0 mm, soldered on striplines
75 W (1,1 mm ´ 28,0 mm). inner L1 dan L13 not connected
L3 = L4 = 52 W stripline (2,0 mm ´ 16,5 mm)
L5 = L8 = 470 nH microchoke
L6 = L7 = 39 W stripline (3,1 mm ´ 8,0 mm)
L9 = L12 = 1 Turn (1,0 mm); diameter 5,5 mm; lead space 2 ´ 3,5 mm
L10 = L11 = 39 W stripline (3,1 mm ´ 34,0 mm)
L3, L4, L6, L7, L10 dan L11 are striplines on PTFE fibre-glass PCB wirh dielectric (Îr = 2,74); w 1/32".
R1 = 10 W carbon resistor
Continue: Broadband RF Amplifier For TV Transmitter 14W #2
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