| Author | Views | Views Today | Rank | Comments |
| 62,380 | 92 |   |
33 |
| Author | Views | Views Today | Rank | Comments |
| 62,380 | 92 | |
33 |
|
The communications between commercial aircraft and the ground can be interesting, amusing and sometimes even disturbing. However radios that receive the approximately 220MHz to 400MHz band commonly used for aircraft (both military and commercial) are not easily found. And scanners can be complicated, large and expensive. With an easy to build circuit such as this one, everyone can enjoy listening in on these conversations. |
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| A more common subsistute for 2N918 would be nice. | ||
| Q1 can also be a BFX73 transistor. | ||
| I can't get my hands on the 1n82 diode. Can anyone suggest some replacements? Also the diode seems to be connected in reversed bias. Is this an error or on purpose? | ||
| Has anyone tested this receiver???? | ||
| I am a novice. Where is audio out and power in? Can someone confirm my observation before I build this scanner? 1-(+) positive side of microphone or speaker tap in at base of Q1 between C3 and C6. 2-(-) Negative of speaker tap in at Q1 emitter at top of L2. 3-Power in at top of C5, power out to positive at R2 at +9V This appear to be the best way. | ||
| this radio is a very well built project it is very stable. when you are building this receiver keep all the leads as short as possible. otherwise you will have problems getting the radio to work. i have not tried the radio on 220-400 mhz. | ||
| total information is not given | ||
| It is avery wonderful circuit.and it is very simpal for new electronic field commers. thank you | ||
| Are you sure this circuit is OK. How does the diode conduct anything at all.It is biased off permanently. My own receiver taps audio from the junction of C3 and R2.No diode needed. For filtering out the squelch oscillation put R1 in place of the diode and take the audio from C1. | ||
| Ok, I had to dig deep to find any schematics to make a really cheap aircraft scanner, but I found one... And its easier than you think! I bought a $5 am / fm radio from the dollar store. I took it apart and literally just used a screw driver to seperate the FM tuner coil (1 of 2 copper coils you'll see on inside). I pushed it far enough apart without breaking where it was soldered to the green board to change the range to 109mhz - 135 mhz.... The catch? Without further modification you always hear the background static.... That and since it was a $5 radio, you pretty much have to be right at the airport to pick up anything... Maybe with a slightly more expensive one and a better antenna you could pick up more..... But for $5, you can't beat the results.... | ||
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