Finished Type/Not Assembled (Optional) 118~136MHz Receiver Frequency R80 Aviation Band PLL Receiver Secondary Frequency Conversion Radio Aircrafts Tower Calls Reception DIY Tool

Features:
It adapt PIC18F1320 single-chip microcomputer as the main control, built-in high-precision PLL circuit, and comes with a frequency indicator circuit, the receiving frequency cover 118~136MHz, 100KHz Stepping.
The kit adopts bandpass filter + high amp +NE602+MC3361+TA7640+LM386 to complete the secondary frequency conversion, one IF 10.7MHz, two IF 455KHz, ultra-high sensitivity, can receive 118-136MHz AM signal.
With LED tuning indicator function, can help to accurately and quickly adjust to the receiving frequency, give you a better using experience.
With quiet noise circuit, free setting threshold, to ensure the comfort of listening, to avert long time noise. At the same time use audio special digital potentiometer (FM62429) to adjust the noise threshold and volume.
Ceramic filters are used in the first and second intermediate frequency circuits, which greatly reduces the difficulty of amateur measurement.