Function:

This is a kit, you need to solder it yourself.

This kit is dedicated to receiving calls between airplanes and towers. With a good antenna (VHF section Yagi antenna), it can receive calls between various types of airplanes and towers up to about 190Km in an open area. The universal interface is convenient for hobbyists to equip the shell, as long as the shell is larger than this board can be used.

This suite is dedicated to receive calls between aircraft and tower, cooperate with the good performance of the antenna (VHF yagi antenna), open withi

Main indicators

Power supply: 9-12 v

Antenna: 50 ohms, is not balanced

Typical receiving current: 30 ma

Receive frequency: 118 MHZ to 136 MHZ

Working pattern: AM

Circuit principle

Antenna to receive signals first enter a bandpass filter, bandpass filter function is to ensure that the 118 MHZ to 136 MHZ signal can be put into CD7358 high, other signal is maximum attenuation. CD7358 internal have a voltage-controlled oscillator at the same time, the frequency changes in D2 junction capacitance, design covers about 120 MHZ to 150 MHZ.

Native intermediate frequency is 10.7 MHz, after CD7358 mixing signal to 10.7 MHz ceramic filter, its function is to filter out irrelevant signals generated by mixing, and then gave CD7613 further intermediate frequency signal and amplification, detection, and the low, and then sent the headphone output.

Among them, the AGC function performed by CD7613.

Component selection

All less than 1000 pf the capacitors for high frequency of ceramics, greater than 1 uf capacitance for aluminum electrolytic capacitors, all resistance is a quarter w 5% fixed resistance.

Production debugging

 Before you install all components all the transistor, resistor, capacitor with a multimeter test again. And then control circuit diagram and the identity of the PCB mounting of all components. General compliance installation sequence of low to high. To install socket in integrated circuit at the same time, this can effectively avoid the core of integrated circuit welding bad. Checked everything is in order, after turn on the juice and the socket insert the headset, put the W2 turn clockwise to the end, should be able to hear white noise . For antenna connected to a soft line of 60 centimeters, can hear the noise significantly larger or hear FM radio, radio frequency (rf) channel basic no problem.

package：1x 2020 DIY KIT R2017 Aviation Band Receiver Aeronautical Band Receiver Kit