Aircraft radio circuit
Description.
Here’s a low cost radio circuit that can be used to listen to the radio conversations between aircrafts. The radio circuit based on transistor 2N918 and diode 1N82 receives in the 220Mhz to 400Mhz range. Capacitor C1 and inductor L1 forms the tank circuit for tuning. Diode D1 performs the detection. Transistor T1 performs the necessary amplification. The out put audio signal is just enough to drive a small headphone. For driving speakers.
Circuit diagram with Parts list.
Notes.
- Use a 45cm long wire for antenna,
- For L1 make 2 turns of 22 AWG magnetic wire on a 5/32 steel bolt.
- POT R5 can be used for adjusting the sensitivity.
- Assemble the circuit on a good quality PCB.That’s an important factor.
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An RF buffer stage such as the one here:
http://krysatec.benghi.org/phprs/images/200603311425_Superbuf.jpg
Will help improve the performance of this receiver. Please see the notes in the link. Also note, you should use a 2N918 or eqiv. transistor. A 2N3904 will not operate at 220MHz to 400MHz.
Hi Enginar 1N82 is a General Purpose UHF-MW Mixer Diode
with a Noise Figure Max. (dB)=16 and in Package=DO-7.
you can try Sanyo 1SS345. Any point contact diode can be tried. you can try 1N4148 or 1N914 but i am doubtful about its suitability here.
Hi Waqas you can use your cable tv input and try to receive audio of TV Band-III or cable channel S Band.
Hello,how can we test this circiut if we have not any aircraft near to us
1N4148′i deneyebilirsin!
Hello, I’m having trouble finding the 1n82 Diode. Are there any alternatives?
Thanks