Pilot1113
Topic Author
Posts: 2276
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Pilot Controlled Lighting

Tue Aug 22, 2000 11:54 pm

Does anyone know these things work?

How does it distinguish between mic clicks and voice?

Since aviation radios are full duplex, how can it distinguish between mic clicks and voice at the same time?

I know how to activate them, but I want to know the technology behind what makes them work...

Thanks!

Neil B. Harrison
 
Guest

RE: Pilot Controlled Lighting

Wed Aug 23, 2000 1:41 am

The airport uses a piece of hardware (about a cubic foot in size) called a receiver/decoder/controller. It receives the signal from the aircraft, then decodes it into the number of short bursts, then controlls the lights based on how many bursts it received. This equipment costs about US$1500.
 
David L
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RE: Pilot Controlled Lighting

Fri Aug 25, 2000 9:50 pm

Er, anybody like to tell me what Pilot Controlled Lighting is?
 
Pilot1113
Topic Author
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David L

Fri Aug 25, 2000 10:47 pm

Pilot Controlled Lighting- Runway lighting systems which are controlled by keying the aircraft's microphone on a specific frequency.

- Neil Harrison
 
David L
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Joined: Tue May 18, 1999 2:26 am

RE: David L

Fri Aug 25, 2000 10:58 pm

Thanks, Neil. But what aspects of the lighting are controlled? Is it just used to turn the lights on/up when an aircraft needs them or can the pilots choose which lights they want to see and alter the brightness to their own needs?
 
CP744
Posts: 192
Joined: Wed Jul 26, 2000 3:08 am

RE: Pilot Controlled Lighting

Sat Aug 26, 2000 12:19 am

It controls the approach, runway and taxiway ( if applicable ) lighting and on some systems it does control the intensity by the number of times you key the microphone. It does not allow you to select which lights you see, it turns all aids on.... and you can sometimes turn them on for varying lengths of time based on how may times the mic is keyed.
 
David L
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RE: Pilot Controlled Lighting

Sat Aug 26, 2000 1:12 am

So it's a means of turning everything on just while it's needed?
 
Pilot1113
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RE: Pilot Controlled Lighting

Sat Aug 26, 2000 5:33 am

David L wrote:
-------------------------------
So it's a means of turning everything on just while it's needed?
-------------------------------

In a matter of speaking... yes. The lights usually stay on for about 15 minutes.

- Neil Harrison
 
aaron atp
Posts: 517
Joined: Sun Mar 19, 2000 1:17 pm

...

Sat Aug 26, 2000 4:37 pm

>>>Since aviation radios are full duplex, how can it distinguish between mic clicks and voice at the same time?

Aviation radios are a simplex type. They send and receive on the same frequency -and can only do one at a time. FYI, marine comm radios have duplex channels (20, 24-28, & 84-88) for communicating with land lines via a marine operator. Pilots do not have such a luxury.

Distinguishing mike clicks is actually quite easy. AvCom radios use something called double-sideband suppressed-carrier amplitude modulation to transmit voice. The receiving radio suppresses the carrier wave and only amps the voice wave, which is demodulated from the carrier. The PCL controller needs only to listen for pulses of the carrier wave on the CTAF frequency. This makes it a much simpler device than the radio in your aircraft. It doesn't even need to demodulate the signal to separate the voice transmission.


aaron
 
David L
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RE: Pilot Controlled Lighting

Sat Aug 26, 2000 7:00 pm

Thanks guys and apologies for cluttering the discussion.

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