Questions tagged [frequency]

Questions about the different radio frequencies used for aircraft communications and navigation and the processes of selecting them.

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Where can I find current downloadable tower, ground and approach frequencies for USA airports?

I have searched the FAA site and cannot find a spreadsheet with current freqs for airports, only incomplete lists. Online flight planning tools must get query-able current freqs on a monthly basis, ...
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0answers
156 views

What is the working principle of VFG [duplicate]

How does the VFG make various frequencies? And while it makes the other value of frequency, how the generator apply consistent 400Hz to the other component?
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2answers
200 views

What is a metering frequency and why would an airport have it?

I just read a post from a pilot complaining about how he thought a metering frequency was useless. It has something to do with being on the ground at an airport. What is it, what purpose does it ...
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0answers
52 views

Why does airnav list frequencies for some STARs on the airport info page?

I was on airnav.com and looked up the info for KIWA. Why does airnav list frequencies for the arrivals (STARs) that serve an airport? Does each frequency correspond to a certain TRACON sector?
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4answers
1k views

Why do localizer/glideslopes use 90/150Hz specifically?

Why is it that localizer and glideslope system are using 90 Hz and 150 Hz frequencies only, instead of some other LF such as 75 Hz? Part two of my question: How does the modulation depth differ for ...
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1answer
173 views

What is the tolerance of SSR against signal frequency shifts?

I know that the Secondary surveillance radar (SSR) interrogates at 1030MHz, and the reply is at 1090MHz. What happens if the radio signal sent to the plane is less than/more than 1030MHz? Also what ...
8
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2answers
607 views

How do I find all the frequencies for my local TRACON?

I'd like to program my hand held radio with all frequencies that I can expect to need around my area. Specifically, I'd like to find an official list of all the frequencies used by the local Tracon ...
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4answers
883 views

Is there a radio frequency that is sure to be quiet?

When flying in beautiful VFR weather, I often search for a quiet frequency so I don't listen to a lot of chatter. Guard (121.5) sometimes works, but sometimes has "Guard"-ians on it. ("Yer on gaaard")...