CTAF Frequencies

Discussion in 'Change to my Frequency...' started by Tfoster100, Oct 7, 2017.

  1. tinerj

    tinerj Cleared for Takeoff

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    Upstream I mentioned a CTAF with digits after the 7 of 122.7, and here it is:

    KRGA Cen Kentucky Regional Airport

    122.725 CTAF
     
  2. tinerj

    tinerj Cleared for Takeoff

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    You've got to understand with the Fly Baby those radio calls are spread over a l-o-n-g time, and other planes may be coming out of IFR (Fly Baby has no transponder) or just tuning to Sullivan CTAF.

    Pushing a button is a small effort to let others know I'm in the neighborhood.

    And, of course, there may be some Yahoo who doesn't follow good radio practice.
     
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  3. flyingron

    flyingron Touchdown! Greaser!

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    There's nothing magic about the numbers in a CTAF. If the field has a tower frequency (when the tower is closed) it is usually the tower frequency. If it has no tower, but has a UNICOM, then it is usually the UNICOM freqeuency. If it has no UNICOM, then it's often a multicom frequency.

    The original UNICOM was 122.8. This was supplanted by 122.7 and 123.0 in the 70's I think. Later four more UNICOM frequencies became available: 122.725, 122.975, 123.050, and 123.075. 122.95 is available as the UNICOM at towered fields (rarely is this a CTAF). There are a few more reserved for future UNICOM or AWOS's up in the area above 136.

    Multicom was 122.9 historically, though 122.85 is sometimes allocated along with a few others.

    123.6 used to be the frequency FSS used for advisories back when we had on-field FSS's. That could be a CTAF as well if the FSS was closed.
     
  4. James331

    James331 Touchdown! Greaser!

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    Makes sense I guess ;)

    I'm used to hitting the downwind at ether 120kts or 170kts
     
  5. bluerooster

    bluerooster Cleared for Takeoff

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    And a nice long time between calls too. (being in Fly Baby) So not congesting the airwaves. :)
     
  6. Bobanna

    Bobanna Line Up and Wait

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    On initial call-up for field advisory, I generally ask if Bertha Butt (one of the Butt sisters) is available. I get called "neanderthal" all the time, but it just runs off...
     
  7. azure

    azure Final Approach

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    And why is that? (other than your avatar, of course...)
     
  8. Gary Austin

    Gary Austin Pre-Flight

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    I fly out of a grass field and everyone there uses 122.75, I was told that was called a muti-com freq. cause it can be air to air or ground to air, air to ground
     
  9. Larry in TN

    Larry in TN Line Up and Wait

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    AIM 4-1-11
     
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  10. Gary Austin

    Gary Austin Pre-Flight

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    Thanks for the post, next time I see the owners I'll bring it up, (will make me look smart)
     
  11. Larry in TN

    Larry in TN Line Up and Wait

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    That's the way to do it. Nobody will believe 'some guy on the internet'. Show it to them in black and white.
     
  12. flyingron

    flyingron Touchdown! Greaser!

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    122.75 is *NOT* the multicom frequency despite what "someone" told you. Alas, Rod Machado used to make this error all the time in his lectures. 122.75 is the general air-to-air frequency.

    Multicom is the CTAF and air-to-ground/ground-to-air frequency for airports with no UNICOM or control tower (or in the distant past, an on-airport FSS advisory). 122.9 is the most common one, though a few others are allocated on a shared basis (like 122.85).

    Absent an indication otherwise from the FAA or FCC, you should be using 122.9 on your random grass strip.

    Anybody using 122.75 on the ground is operating illegally.
     
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  13. Gary Austin

    Gary Austin Pre-Flight

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    I wonder if maybe that freq was used for air to ground long ago, or something?, well could be too long ago with .xx
     
  14. flyingron

    flyingron Touchdown! Greaser!

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    It hasn't changed in the 38 years I've been flying.
     
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  15. Briar Rabbit

    Briar Rabbit Pre-takeoff checklist

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    Air to air used to be 122.9 in the 60’s & 70’s.
     
  16. flyingron

    flyingron Touchdown! Greaser!

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    The post I was responding to was suggesting that 122.75 used to be air-to-ground (multicom).
     
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  17. N1120A

    N1120A Pre-takeoff checklist

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    I was flying into IZA the other day and could hear, loud and clear, transmissions from WVI. Those airports are 163 nm apart and even have some terrain around. Sometimes, weather causes these transmissions to travel farther. Both use 122.8.

    I think it is just a habit some people develop, likely because human beings enjoy repetition. I usually do the latter, but the former sometimes pops up.
     
  18. denverpilot

    denverpilot Ejection Handle Pulled

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    "Weather" in the traditional sense is usually not the reason... unless tropospheric ducting is taking place. Space weather in the ionosphere however, can have a dramatic effect a few times a year when the MUF rises to VHF.