RDS ENCODER FM STEREO

 

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1 WATT PLL FM BROADCAST

 This is a 1 Watt PLL FM broadcast transmitter. The RF output varies from 500mW to about 1.2W depending on the frequency selected and RF output transistor used. Motorola 2N4427 always seems to work well. Transmitter uses CMOS PLL VCO that prevents the frequency drifts. The frequency is selected via DIP switches. The transmitter is supplied by 12V DC and can also be powered from the battery.

This is a rather crude PCB layout i did using MS Paint. Not the best but it should work 

This shows the test point for the PLL lock voltage. Ideally, it should be set for 3Volts (in the middle) using the oscillator coil. If the voltage doesn't change, oscillator may be at the end of its range in which case then c3 should be either increased slightly for a lower frequency and decreased for higher frequency. Try 22pf plus/minus 10pf 

Component Values for VHF PLL 

Resistors 

R1 - 10K 
R2 - 10K 
R3 - 10K 
R4 - 10K 
R5 - 10K 
R6 - 100R 
R7 - 1K 
R8 - 10K 
R9 - 470R 
R10 - 10K 
R11 - 470R 
R12 - 100R 
R13 - 470R 
R14 - 10K 
R15 - 10R 
R16 - 47R 
R17 - 10R 
R18 - 100K 
R19 - 1K 
R20 - 10K 
R21 - 10K 
R22 - 1M 
R23 - 100K 
R24 - 100K 
R25 - 100R 

RP1 - 9 Pin 100K Commoned Resistor array 
RP2 - 9 Pin 100K Commoned Resistor array 

Capacitors 

C1 - 1uF electrolytic 
C2 - 27pF ceramic 
C3 - 22pF ceramic (tuning cap- change to extend tuning range) 
C4 - 27pF ceramic 
C5 - 100pF ceramic (101) 
C6 - 100pF ceramic (101) 
C7 - 100pF ceramic (101) 
C8 - 1000uF electrolytic 
C9 - 100nF ceramic (104) 
C10 - 100nF ceramic (104) 
C11 - 100pF ceramic (101) 
C12 - 4.7pF ceramic 
C13 - 100nF ceramic (104) 
C14 - 100nF ceramic (104) 
C15 - 100nF ceramic (104) 
C16 - 100nF ceramic (104) 
C17 - 100nF ceramic (104) 
C18 - 39pF ceramic 
C19 - 39pF ceramic 
C20 - 39pF ceramic 
C21 - 39pF ceramic 
C22 - 1nF ceramic (102) 
C23 - 10nF ceramic (103) 
C24 - 47uF electrolytic 
C25 - 1uF electrolytic 
C26 - 10uF electrolytic 
C27 - 100nF ceramic (104) 
C28 - 100nF ceramic (104) 
C29 - 100nF ceramic (104) 
C30 - 100nF ceramic (104) 
C31 - 100pF ceramic (101) 
C32 - 100nF ceramic (104) 
C33 - 47uF electrolytic 
C34 - 100nF ceramic (104) 

VC1 - 2..22pF green trimmer 
VC2 - 5..60pF yellow trimmer 
VC3 - 2..22pF green trimmer
VC4 - 2..22pF green trimmer 

Inductors 

L1 - Toko tuning coil with screening can 5.5 turns 100-075 
L2 - Toko S18 Yellow 
L3 - Toko S18 Yellow 
L4 - Toko S18 Green 
L5 - Toko S18 Green 
L6 - Toko S18 Orange 
L7 - Toko S18 Orange 
L8 - RF choke 10uH-100uH 

Semiconductors 

VD1 - Variable capacitance diode 
VD2 - Variable capacitance diode 
VD3 - Variable capacitance diode 
D1 - 1N4841 
ZD1 -BZX 6.2V Zener Diode 

Q1 - BSX20 
Q2 - BSX20 
Q3 - BSX20 (or ztx313 on older boards) 
Q4 - BSX20 (or ztx313 on older boards) 
Q5 - 2N4427 with clip on heatsink (Motorola will give more power) 

74HC4024 - Binary Counter 
74HC4060 - Binary counter with oscillator 
74HC4046 - Phase locked loop IC 
74HC4059 - Divide by N counter 

Miscellaneous 

6.4 Mhz Quartz Crystal 
DIP1 - 8 Way DIL DIP Switch 
DIP2 - 8 Way DIL DIP Switch 

Update: I finally got round to redrawing this in EAGLE. You can download the EAGLE PCB files below. 
Here are some 3D renders of the Gerber files.