35 m hz frequency counter

1. 35MHZ FREQUENCY
COUNTER
4S6GGS
Her the we are use main CPU PIC16F628A and 16x1 LCD
Display introducing 35MHz frequency measurement
Counter. This frequency counter contains only a few
components and easy to make SWL / Ham Operator.
4s5gs.gayan@gmail.com

2. 35MHZ FREQUENCY COUNTER
Her the we are use main CPU PIC16F628A and 16x1 LCD Display
introducing 35MHz frequency measurement Counter. This frequency counter contains only a
few components and easy to make SWL / Ham Operator.
MAIN FEATURES
 Frequency measurement 35MHz
 Sensitivity of less than 150 m.V
 Operating Voltage 8V – 16V
 Direct frequency measurement
 2 select Gate time 1S <0.000000> 7Digit 125mS <0.00000> 6 Digit push a button 3S.
 10 Hz frequency resolution.
 9 offset channels selectable with a push button.
 3 Offset channel (VFO + IF) , (VFO IF), ( IF - VFO )
 2 select USB/LSB displayed as N / R (Normal / Reverse) 2 Way switch.
Some E.g.1
• 3 Offset channel (VFO + IF), (VFO IF), (IF - VFO) / 9 offset channels
VFO = 10MHz / 9 offset channels 1 – 10.7MHz
(VFO+IF) = F 10+10.7MHz=20.7MHz
4S6GGS E mail . 4s5gs.gayan@gmail.com / Web .4s6ggs.blogspot.com

3. 35MHZ FREQUENCY COUNTER
Part Value
C1 24p
C2 24p
C3 0.001uF
C4 56p
C5 0.1uF
C7 0.01uF
C8 0.01uF
C12 40pF
C13 100uF
4S6GGS E mail . 4s5gs.gayan@gmail.com / Web .4s6ggs.blogspot.com

4. 35MHZ FREQUENCY COUNTER
C14 220uF
D1 1N4148
D2 1N4148
D3 1N4004
DIS1 LCD 16X1
IC1 PIC16F628
L1 100uH
L2 1.1mH
Q1 4.0000MHz
R1 5k
R2 5k
R3 5k
R4 5k
R5 9k
R6 1k
R7 50R
R8 390R
R9 100 - 1K
R10 470R
R11 47k
T1 C3355
4S6GGS E mail . 4s5gs.gayan@gmail.com / Web .4s6ggs.blogspot.com

5. 35MHZ FREQUENCY COUNTER
PCB
4S6GGS E mail . 4s5gs.gayan@gmail.com / Web .4s6ggs.blogspot.com

6. 35MHZ FREQUENCY COUNTER
4S6GGS E mail . 4s5gs.gayan@gmail.com / Web .4s6ggs.blogspot.com