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10-12-2008, 12:15 PM #1
- Join Date
- Apr 2007
- Location
- Paris
- Posts
- 10
Two opposite Rwy with identical ILS frequency
Hello,
Wonder if someone can tell me how to tune the correct ILS freq for one rwy when the opposite rwy has the same freq. example Toronto CYYZ rwy15R - ILP and rwy33L -ITO, both share the 110.95 freq.
How to tell the nav1 and nav2 that, for example, for the rwy 15R it should tune the freq and the correct code (ILP)?
Thanks for your help
Joaquim
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10-12-2008, 05:13 PM #2
Uhm, would one runway happen to be a backcourse localizer approach?
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10-12-2008, 05:13 PM #3
- Join Date
- Jun 2008
- Location
- Stafford, UK
- Posts
- 161
What you need to do is tune the frequency, and enter the course. Then you need to listen to the ILS identifier which will output in Morse Code. ILP will be
.. .-.. .--. and ITO will be .. - ---
This should repeat itself. If you hear an E ( . ) between repeats then the station has an error and may not be giving correct information.
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10-12-2008, 05:17 PM #4
- Join Date
- Jun 2008
- Location
- Stafford, UK
- Posts
- 161
Also the transmissions are usually highly directional, so you most likely will only get the signal for the end of the runway you are approaching.
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10-12-2008, 05:44 PM #5
Whoa Hold on. If I understand the OP's message, he is dealing with a localizer backcourse, there is only 1 transmitter on the ground! Guys, read up on a instrument procedures, specifically localizer backcourses...
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10-12-2008, 06:09 PM #6
- Join Date
- Jun 2008
- Location
- Stafford, UK
- Posts
- 161
Joaquim mentions nothing about back course. It is quite common that two ends of a runway use the same frequency. Eg Birmingham EGBB has one main runway 15/33. It has the same frequency for the ILS at both ends of the runway and neither is a back course approach.
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10-12-2008, 06:37 PM #7
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10-12-2008, 07:42 PM #8
- Join Date
- Jan 2007
- Posts
- 496
No, there are two directional transmitters on the same frequency*, facing opposite directions. Being highly directional they don't interfere. The ID they transmit will be different -- if it were only one transmitter that would not be so.
[* Strictly speaking of course there are 4 transmitters -- 2 each of localiser and glideslope. Probably 6 counting DME as well. But all tuned in automatically by the one 'frequency' setting on the clever NAV radios.].
Regards
Pete
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Post Thanks / Like - 1 Thanks, 0 Likes, 0 DislikesMatt Olieman thanked for this post
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10-12-2008, 08:05 PM #9
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10-12-2008, 08:58 PM #10
- Join Date
- May 2007
- Location
- Near Winnipeg, MB, Canada
- Posts
- 17
In these dual installations with single frequency ILS', the tower controller selects which one will be operational at any one time which corresponds to the active runway ... they do not transmit simultaneously, or interference would result. Usually, they will also have an interlock system which would prevent both transmitters to be on-air at the same time.
As an FYI, backcourse approaches are getting to be somewhat rare in Canada, as GPS overlay approaches displace them from the approach inventory. GPS can give lower approach limits than a BC under most situations.
Regards,
Lee Smith
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