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Random avionics internals

Prob99 a marker beacon receiver, which is some tens of MHz.

Yes for sure whoever designed this just loved using a lot of components A better way would be a little CPU scanning the buttons and switching some muxes and op-amps.

Interesting they use relays and not analog switches. Relays are robust whereas muxes are easy to blow up with static, +24V, etc.

Shoreham EGKA, United Kingdom

Yes, it is a marker beacon receiver, and the yellow wires on the right go to white/blue/amber lights.

The use of relays probably also makes it easier to implement the fail-safe feature (no power to audio panel => pilot is connected to COM1)

Last Edited by Ultranomad at 11 Jun 09:20
LKBU (near Prague), Czech Republic
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