VHF airband radio circuit

[dope40]

Hi, i plan to build VHF airband radio , more specific 110-180 MHz with an antena placed on my roof , if someone has circuits or links please share. :grin:

 

[Genovator]

This is a circuit of tv transmitter, but this circuit works for both video and audio (specially audio).

https://electronics-diy.com/electronic_schematic.php?id=889

 

[dope40]

sorry ,i didn't specified i have build the transmiter i want to build the receiver.

 

[dope40]

i have found this circuit https://aaroncake.net/circuits/aircraftrecv.asp , but i works from 220-400 MHz ...can i make it work from 150-200 MHz ?

 

[betwixt]

Just add an extra two turns to the tuning coil but take note of the comments below the schematic. Also be aware that this kind of receiver radiates a small signal so if you are using it in or very close to an airport you may cause interference to aircaft communications.

Brian.

 

[dope40]

Thanks :grin:

 

[Audioguru]

The single transistor "radio" has extremely poor performance. You must constantly fiddle with its gain control while tuning it.
If the signal is strong and the gain is too high then it oscillates. If the signal is weak and the gain is too low then it is dead.
A real radio has automatic gain control.

Aircraft communications use AM modulation.