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Pilot Controlled Lighting  
User currently offlinePilot1113 From United States of America, joined Aug 1999, 2333 posts, RR: 11
Posted (14 years 1 week 1 day 14 hours ago) and read 4280 times:

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

9 replies: All unread, jump to last
 
User currently offlineN766AS From , joined Dec 1969, posts, RR:
Reply 1, posted (14 years 1 week 1 day 12 hours ago) and read 4179 times:

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.

User currently offlineDavid L From United Kingdom, joined May 1999, 9524 posts, RR: 42
Reply 2, posted (14 years 5 days 16 hours ago) and read 4115 times:

Er, anybody like to tell me what Pilot Controlled Lighting is?

User currently offlinePilot1113 From United States of America, joined Aug 1999, 2333 posts, RR: 11
Reply 3, posted (14 years 5 days 15 hours ago) and read 4109 times:

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

- Neil Harrison


User currently offlineDavid L From United Kingdom, joined May 1999, 9524 posts, RR: 42
Reply 4, posted (14 years 5 days 15 hours ago) and read 4106 times:

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?

User currently offlineCP744 From Canada, joined Jul 2000, 200 posts, RR: 0
Reply 5, posted (14 years 5 days 13 hours ago) and read 4106 times:

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.

User currently offlineDavid L From United Kingdom, joined May 1999, 9524 posts, RR: 42
Reply 6, posted (14 years 5 days 12 hours ago) and read 4098 times:

So it's a means of turning everything on just while it's needed?

User currently offlinePilot1113 From United States of America, joined Aug 1999, 2333 posts, RR: 11
Reply 7, posted (14 years 5 days 8 hours ago) and read 4094 times:

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


User currently offlineAaron atp From United States of America, joined Mar 2000, 533 posts, RR: 2
Reply 8, posted (14 years 4 days 21 hours ago) and read 4081 times:

>>>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


User currently offlineDavid L From United Kingdom, joined May 1999, 9524 posts, RR: 42
Reply 9, posted (14 years 4 days 19 hours ago) and read 4079 times:

Thanks guys and apologies for cluttering the discussion.

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