It is dedicated to receiving calls between airplanes and towers. With a good antenna (VHF section Yagi antenna), the open area can receive calls between various types of airplanes and towers within a maximum of about 150Km. Please pay attention to friends who like it.
Has the following characteristics:
1. Use PIC18F1320 single-chip microcomputer as the main control, built-in PLL local oscillator module (pre-welded, stamp hole plate, support calibration setting), with frequency indicator circuit (using 7-segment digital tube, display unit is 100KHz, the photo has color difference, actual Red), the receiving frequency covers 118-136MHz, 100KHz or 10KHz step (refer to the figure below, free switching).
2. The kit uses bandpass filter + high amplifier + NE602 + MC3361 + TA7640 + LM386 to complete the secondary frequency conversion, one intermediate frequency 10.7MHz, two intermediate frequency 455KHz, ultra-high sensitivity, can receive 118-136MHz AM signal.
3. With LED tuning indicator function, it can help to adjust the receiving frequency accurately and quickly, which is convenient to use.
4. It has a squelch circuit and freely set thresholds to ensure comfortable listening and avoid long-term noise. At the same time, use the audio dedicated digital potentiometer (FM62429) to adjust the squelch threshold and volume.
5. The first and second intermediate frequency circuits all use ceramic filters, which greatly reduces the difficulty of amateur debugging.
6. 12V power supply, the size of the PCB board is 8.4*12cm, which can be easily put into an 88*30*120mm aluminum case (the shop will customize the R80 case in the future).
Reminder: Because the VHF band is already similar to the propagation of light-linear propagation, the receiving location is far away from the airport without obstacles (more than 25Km), please be sure to install a high-gain antenna such as the VHF section Yagi antenna; between the receiving location and the airport If there are large obstacles (including but not limited to tall buildings, mountains, huge towers), you must avoid the obstacles; otherwise, you can only receive the one-way signal from the aircraft on the way in, thank you
Kit description
This kit has not been soldered, and the delivery is all scattered electronic components. The pictures of the finished product displayed in this store are for reference only when purchasing.