CTAF Frequencies

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

  1. Tfoster100

    Tfoster100 Pre-Flight

    Joined:
    Jun 26, 2015
    Messages:
    36
    Location:
    DFW
    Display Name:

    Display name:
    Tim
    I fly in the DFW area and notice on local frequencies like 122.8, 122.9, 123 etc you hear a lot of different airport calls. My question is why don’t they have different numbers for airports within 40 miles or so? Are there not enough possible frequencies? Or is that just unusual bleed over of farther away airports.
     
  2. Larry in TN

    Larry in TN Line Up and Wait

    Joined:
    Nov 16, 2013
    Messages:
    612
    Location:
    Nashville, TN
    Display Name:

    Display name:
    Larry in TN
    AIM Table 4-1-2 covers the Unicom/Multicom frequencies. There are seven designated Unicom frequencies.

    It does seem that they could be better allocated in many areas. I don't know why they aren't.
     
  3. AKBill

    AKBill Cleared for Takeoff

    Joined:
    Nov 29, 2014
    Messages:
    1,130
    Location:
    Juneau, AK
    Display Name:

    Display name:
    AKBill
    Only 2 airports in a 40 mile radius were I live and they have different frequencies. I bet in a congested area with many airports it would be distracting sorting out the different calls.
     
  4. Palmpilot

    Palmpilot Touchdown! Greaser! PoA Supporter

    Joined:
    Apr 1, 2007
    Messages:
    13,394
    Location:
    PUDBY
    Display Name:

    Display name:
    Richard Palm
    If the frequency gets congested enough, you may have to transmit while someone is still talking at another airport. The inverse square law makes it likely that aircraft in the pattern at a particular airport will still be able to hear each other, because the transmissions from farther away will be weaker.
     
    Ryanb likes this.
  5. Palmpilot

    Palmpilot Touchdown! Greaser! PoA Supporter

    Joined:
    Apr 1, 2007
    Messages:
    13,394
    Location:
    PUDBY
    Display Name:

    Display name:
    Richard Palm
    That's one reason why the airport name should be said at both the beginning and end of each transmission.
     
  6. Greg Bockelman

    Greg Bockelman Administrator Management Council Member

    Joined:
    Feb 23, 2005
    Messages:
    8,876
    Location:
    Lee's Summit, MO
    Display Name:

    Display name:
    Greg Bockelman
    On that subject, why start off saying "Podunk Traffic" and ending with "Podunk Traffic"? Is that what is being taught now? Why not start with "Podunk Traffic" and simply ending with "Podunk"?
     
  7. dmspilot

    dmspilot Pattern Altitude

    Joined:
    Oct 20, 2006
    Messages:
    2,179
    Display Name:

    Display name:
    dmspilot
    I don't believe it's being taught but lots of people do things differently than the way they were taught.
     
  8. flyingron

    flyingron Touchdown! Greaser! PoA Supporter

    Joined:
    Jul 31, 2007
    Messages:
    13,551
    Location:
    Catawba, NC
    Display Name:

    Display name:
    FlyingRon
    Of course, when you have two airports in very close proximity, you want them on the same frequency.
     
    Ryanb likes this.
  9. Hank S

    Hank S En-Route

    Joined:
    Jul 3, 2013
    Messages:
    3,163
    Location:
    Eclectic, AL
    Display Name:

    Display name:
    Hank
    That's how I was taught--PPL in 07, Instruments in '10. Now I'm so far out in Podunk that I'm the only plane at the airport!

    It's not uncommon to hear transmjssions from > 100 nm away. There are three fields within ~20 nm that come to mind, all have different frequencies.
     
  10. Capt. Geoffrey Thorpe

    Capt. Geoffrey Thorpe Final Approach PoA Supporter

    Joined:
    Jun 7, 2008
    Messages:
    9,270
    Location:
    DXO124008.6
    Display Name:

    Display name:
    Light and Sporty Guy
    In the 1930's, most aircraft didn't have radios so it wasn't a problem.


    But, what I suggest is that you plan most of your flights only to airports on the same frequency as home - that way you don't have to figure out how to change frequencies (this knob, that knob, push in gives different than pulling out, way too much hassle), and you are likely to get to know the people that you are listening to all the time.
     
    TRocket and Wrench978 like this.
  11. mscard88

    mscard88 Touchdown! Greaser!

    Joined:
    Oct 1, 2015
    Messages:
    13,167
    Location:
    Alabama
    Display Name:

    Display name:
    Mark
    Same thing really and is fine. I taught it that way too. It's always made sense to me. If another pilot misses the beginning hopefully they will catch it at the end.
     
  12. Salty

    Salty Cleared for Takeoff

    Joined:
    Dec 21, 2016
    Messages:
    1,009
    Location:
    FL
    Display Name:

    Display name:
    Salty
    You say that jokingly, but more than half of the hamburger stops I fly to have the same freq as my home airport.
     
  13. tinerj

    tinerj Cleared for Takeoff

    Joined:
    Jul 1, 2012
    Messages:
    1,132
    Display Name:

    Display name:
    tinerj
    I'm so used to seeing 122.7, that I dialed that in, only to see later that it was 122.705. I'm used to 123 having decimal fractions, but not 122.7 and 122.8.
     
  14. Capt. Geoffrey Thorpe

    Capt. Geoffrey Thorpe Final Approach PoA Supporter

    Joined:
    Jun 7, 2008
    Messages:
    9,270
    Location:
    DXO124008.6
    Display Name:

    Display name:
    Light and Sporty Guy
    I hear calls for Ann Arbor Tower (ARB - 120.3) on CTAF 123.0. I assume there is the occasional lysdexic pilot out there.
     
  15. Palmpilot

    Palmpilot Touchdown! Greaser! PoA Supporter

    Joined:
    Apr 1, 2007
    Messages:
    13,394
    Location:
    PUDBY
    Display Name:

    Display name:
    Richard Palm
    The latter is how I was taught twenty-six years ago, and it's what I still do.
     
    Last edited: Oct 8, 2017
    TRocket likes this.
  16. mkosmo

    mkosmo Pattern Altitude PoA Supporter

    Joined:
    Jul 27, 2012
    Messages:
    2,164
    Location:
    Houston, TX
    Display Name:

    Display name:
    mkosmo
    Airports open and close. It's a moving targets and changing freqs introduces a safety challenge.
     
  17. mkosmo

    mkosmo Pattern Altitude PoA Supporter

    Joined:
    Jul 27, 2012
    Messages:
    2,164
    Location:
    Houston, TX
    Display Name:

    Display name:
    mkosmo
    122.705 isn't an aero freq in the US :)

    That one wouldn't even be with 7.33mhz spacing.
     
  18. Palmpilot

    Palmpilot Touchdown! Greaser! PoA Supporter

    Joined:
    Apr 1, 2007
    Messages:
    13,394
    Location:
    PUDBY
    Display Name:

    Display name:
    Richard Palm
  19. Palmpilot

    Palmpilot Touchdown! Greaser! PoA Supporter

    Joined:
    Apr 1, 2007
    Messages:
    13,394
    Location:
    PUDBY
    Display Name:

    Display name:
    Richard Palm
    Maybe it was 122.725.
     
  20. luvflyin

    luvflyin En-Route PoA Supporter

    Joined:
    May 8, 2015
    Messages:
    3,352
    Location:
    Vancouver WA
    Display Name:

    Display name:
    Luvflyin
    Yeah. There used to be the San Fernando airport that was closer to KWHP than different runways at some airports. The traffic patterns could literally overlap. Things could get a little 'testy' sometimes on the frequency.
     
  21. bobmrg

    bobmrg Pattern Altitude PoA Supporter

    Joined:
    Aug 13, 2007
    Messages:
    2,471
    Display Name:

    Display name:
    Bob Gardner
    Ask the FCC...they assign the frequencies.

    Bob
     
  22. mkosmo

    mkosmo Pattern Altitude PoA Supporter

    Joined:
    Jul 27, 2012
    Messages:
    2,164
    Location:
    Houston, TX
    Display Name:

    Display name:
    mkosmo
    That'd be legal and is an allocated CTAF.

    Current CTAF freqs: 122.7 122.72 122.8 122.97 123.0 123.05 123.07
     
  23. Pilawt

    Pilawt Final Approach

    Joined:
    Sep 19, 2005
    Messages:
    5,035
    Display Name:

    Display name:
    Pilawt
    Years ago my home field had the same CTAF as an uncontrolled "regional" airport on the other side of the mountains, some 65 nm away. Normally it wasn't a problem, of course; except for the occasional bizjet, inbound to the regional airport, who'd call up just as he's starting down from FL360 to put in his orders for fuel, lodging, lav service, Prist, rental car, lunch, feminine companionship, etc., etc., etc. Not necessarily in that order.

    :mad:
     
  24. flyingron

    flyingron Touchdown! Greaser! PoA Supporter

    Joined:
    Jul 31, 2007
    Messages:
    13,551
    Location:
    Catawba, NC
    Display Name:

    Display name:
    FlyingRon
    The FCC however isn't going to go around reassigning frequencies. It's up to the individual airports involved to make the application to move theirs to a different frequency.

    Info here rather simply explained: https://www.aopa.org/advocacy/advoc...ces-process-brief-changing-unicom-frequencies

    What the FCC wants people to do is get together on a regional basis and do their work for them and submit an answer (this is inline with just about everything the FCC does in frequency allocation these days if they can).
     
  25. Zeldman

    Zeldman Final Approach

    Joined:
    Jun 13, 2014
    Messages:
    6,017
    Location:
    NM or AK
    Display Name:

    Display name:
    Billy
    Tell us more about your experiences flying in the 30s.....:lol::lol::lol:
     
    TRocket and Timbeck2 like this.
  26. Clark1961

    Clark1961 Touchdown! Greaser!

    Joined:
    Jun 7, 2008
    Messages:
    14,308
    Display Name:

    Display name:
    Throttle
    Well ya din't have to be concerned about complying with a SID or a STAR...
     
    Zeldman likes this.