enter image description here

I found the above in the Jeppesen Airport Chart Legend.

What would be an example of a transmit-only frequency? Is it related to Flight Service Stations? If so, how?

Where can I find an example for transmit-only frequency on a chart?

  • 3
    $\begingroup$ Are you talking about certain frequencies usually shared with navaids that are transmit on one frequency and receive on an other? $\endgroup$
    – Ron Beyer
    Apr 27, 2017 at 20:11
  • 1
    $\begingroup$ Maybe when the same ATC operator can use multiple frequencies, and cross-couple them (retransmit one to the other) or disconnect cross-coupling (to prevent an aircraft to RFI others). Seems to be used in Indianapolis terminal aera. $\endgroup$
    – mins
    Apr 27, 2017 at 22:43
  • $\begingroup$ Would GUARD be an example of this? $\endgroup$
    – alex
    Apr 28, 2017 at 10:48

1 Answer 1


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(skyvector.com) Chart Supplement for Redding Municipal Airport.

An example of transmit-only frequency would be a VOR frequency used for a remote communications outlet (RCO). From the example above, 108.4T is a transmit-only frequency using the voice channel of the VOR.

How to use: How do I contact Flight Service while in flight?


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