You must wondered, building a frequency counter is a tough task, but is not as hard as you though.
Those materials that needed are:
- LCD 16 character x two lines
- TCXO 12.8 MHz (1ppm)
- PIC 16F84
Some of the features for this frequency counter:
- It can show the frequency in between 100Hz – 2.5GHz and the voltage (0-510mV) on the LCD display.
- Well furnished with IF offset-function, and can be applied for the frequency display with the homemade transceiver.
- Small sized circuit board with 10cm x 4.3 cm.
Now, you will learn how to deal with the IF OFFSET.
Firstly, when you see the RB3=H, RB5=H and RB0=H, this means it is a normal frequency counter with the power turned on.
When the SW for RB7 is pushed, the LCD will show “ADJ”. If you twice the tact SW for RCB is pushed, then the LCD shows “OFF” signal.
You will notice the RB5 and RB0 set as “H/L”, only after the power is turned off. In the final step, you now can make the display with IF OFFSET!