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HF Propagation


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VHF Airband - Receivers

Click to enlargeA Superregen Receiver by KE3IJ
This is the receiver I was bragging about on the Radio index page -- the receiver that is so sensitive it can hear the local oscillator inside a small transistor radio 30 - 50 feet away.

The passive or non-emissive Airband Receiver is basically an amplified "crystal radio" designed to receive nearby AM aircraft transmissions (121 - 133 MHz).

Click to enlargeAviation Band Receiver Schematic Diagram
shows a schematic diagram of the Aviation Receiver--a cool heterodyne AM (Amplitude Modulated) assemblage congenital about four IC's: an NE602 bifold counterbalanced mixer (U1), an MC1350 beeline IF amplifier (U2), an LM324 cloister op-amp (U3), and an LM386 audio amplifier (U4).

Click to enlargeNon-Emissive Air-Band Receiver by VK2ZAY
The circuit is only superficially different to Charles Wenzel's original design. The major departure from Charles' implementation is the use of the main tank inductor as a loop antenna.

Click to enlargePassive Aircraft Receiver by Charles Wenzel
The Passive Aircraft Receiver is basically an amplified "crystal radio" designed to receive nearby AM aircraft transmissions. The "passive" design uses no oscillators or other RF circuitry capable of interfering with aircraft communications so it should be fine inside the cabin of the aircraft.

Click to enlargeVHF Tracking Receiver by Jerry Baumeister
A superregenative receiver developed for tracking small FM transmitters but also tunes the aircraft band and the top portion of the FM broadcast band. Receives both AM and FM (107mHz to 135 MHz).

Creation date : 07/02/2010 @ 13:17
Last update : 27/09/2020 @ 22:23
Category : VHF Airband
Page read 18704 times

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