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 What's The General Differences Between All The Frequencies? |
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 Dec 12 2007, 06:22 PM
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Cessna 152 Member
Group: Newbies
Posts: 19
Joined: 12-December 07
Member No.: 5,960
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I thiink I have a basic running idea but I wanted to know the differences between all the frequencies (i.e. tower, departure, tower, and clearance frequencies? Also which frequency type would I be most apt to hearing real time weather conditions - where pilots or atc are reporting "light to moderate chop" conditions...
Also, I need to learn more about ATC communications, where should I go online to learn this?
- Kareem
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Dec 12 2007, 06:43 PM
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Space Shuttle Member
Group: Full Access Members
Posts: 1,037
Joined: 9-April 07
From: Wor Yerm
Member No.: 5,208
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A big question, so let's start. Get the weather: ATIS or phone Get a clearance: Clearance Delivery Ready for Start: Clearance Delivery or Start Taxi: Ground Entering runways and Take Off: Tower First Call: Departures Next Call: Radar/Control En-route and Initial Descent: Radar/Control Intermediate descent: Approach Close in: Arrivals or Director Very Close and Landing: Tower Taxy in: Ground HOWEVER: Some places do it all on one frequency, some combine the tasks (sometimes), some don't bother with any of it (oh bliss!), this is probably Europe only, etc... Weather = ATIS, ride reports = en-route. Where to learn: I typed in "ATC Radio" and got this, but there were lots more. Have fun. PM
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Dec 12 2007, 07:42 PM
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Space Shuttle Member
Group: Full Access Members
Posts: 923
Joined: 30-June 05
From: Medellín-Enrique Olaya Herrera(EOH/SKMD), Colombia
Member No.: 1,737
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Hey PM, you forgot Center!  Nah, just kidding. Just like PM said above, some places have all the freq's, some have all, and some have just one or two; I think those would be uncontrolled airfields. For example, in airports with not too much traffic the Clearance Delivery freq may disappear, so in this case the ground control would do both tasks. And if the airport is not that big, ground freq can be gone also, so tower would cover 3 tasks. I suggest just as PM said, search on the web, there has to be quite a few sites that can explain this to you, for example VATSIM.
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Dec 14 2007, 04:41 PM
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The Rant Master
Group: Full Access Members
Posts: 1,225
Joined: 17-April 05
From: Atlanta, Georgia
Member No.: 1,333
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QUOTE(Piltdown Man @ Dec 13 2007, 05:51 PM) [snapback]123635[/snapback] Air Rabbit, we have the same books and the numbers therein are identical! But when studying for the ATPL, I asked the question "How come 243 mHz is considered to be in the UHF band being 57 mHz short". That was never answered (nor asked in my exams).
PM I asked almost the identical question when I was a student – unfortunately, I had an instructor that taught you how to take apart and put back together anything you asked about (not a bad idea, actually), and, as a result, I learned quite a lot (forgot most of it by now). I found the numbers I posted (and still remember) and asked the same questions – The way it was explained to me is that, obviously radio waves are likely to be found at an infinite number of frequencies – up to the point that you get to infrared and visible light and so on. Someone had come along and assigned the divisions that I remembered. But others have assigned other divisions, based on both frequency and modulation. As have recognized, even though the numbers I learned (and the ones to which you have access) say that 300 MHz is where “VHF” frequencies end and “UHF” frequencies begin, not everyone plays that game. Here’s another way of dividing the frequency range. Frequency bands and modulations VHF-FM 30MHz to 88 MHz VHF-AM 108MHz to116 MHz VHF-AM 116MHz to 156 MHz UHF-FM 156MHz to 174 MHz UHF-FM/AM 225MHz to 400 MHz UHF-FM 400MHz to 470 MHz Clearly, here, these guys say that “VHF” ends at 156 MHz and that’s where “UHF” frequencies begin. But notice that the VHF frequencies (108 – 156 MHz) are all Amplitude Modulated (AM), and starting at 156 MHz to 174 MHz, what is called “UHF” is Frequency Modulated (FM) and then UHF frequencies above that are both Amplitude and Frequency Modulated (AM/FM) and then drop back to Frequency Modulated at 400 – 470 MHz. So, you might ask, “Who are THESE GUYS?” Care to guess? Yep. The US Military. So, after all that, the answer depends on who you ask - assuming you get an answer in the first place. But, even so, you probably know a lot more about radio frequency range now than you’d care to know … but, that is one of the fallacies I have and the reason that I’ve acquired the moniker of “the Rant Master.” Sorry ‘bout that. Cheers!
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Dec 16 2007, 04:01 PM
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The Rant Master
Group: Full Access Members
Posts: 1,225
Joined: 17-April 05
From: Atlanta, Georgia
Member No.: 1,333
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When on active duty I flew the KC135 for several years. The F101 (Voodoo) was not equipped with UHF radios (and almost all USAF fighters were VHF/UHF equipped) and we didn't have VHF. So we refueled all the time using HF. What a kick ... particularly when you were in the soup! We used "hand signals" as much as radio calls in many cases! And, once, when I was on the ramp at Robins AFB, GA, I cycled the radio and asked for a radio check from the Command Post at Andersen AFB, Guam ... it was just like they were next door! Engines were shut down - and, yes, the ammeter did have an apoplectic moment or two!
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