Every time I click on a PSK macro, before transmitting the message, fldigi outputs a burst of something for about a second. This is visible but not readable on my waterfall display. It wastes time and I want to get rid of it.

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    $\begingroup$ Is your TX ID on? $\endgroup$ – AndrejaKo Dec 13 '16 at 16:18
  • $\begingroup$ Welcome to ham.stackexchange.com! We recommend that new users take the tour to get the most from the site. $\endgroup$ – rclocher3 Dec 13 '16 at 20:57
  • $\begingroup$ I see that you have asked several questions related to fldigi. You might benefit from the collected wisdom of the Winfldigi community on groups.io. $\endgroup$ – Brian K1LI Jul 4 '19 at 18:37

That's a Reed-Solomon identification (RSID). It's purpose is to tell other stations what mode you are using. For PSK it's usually pretty obvious.

To disable it, look for the "TxID" button in the upper-right of the window, and click it to toggle it on and off.

(As you might imagine, the RxID button toggles the receiving of RSIDs. When it is enabled, Fldigi will tune the receiver and switch to the correct mode automatically when it hears one.)

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  • $\begingroup$ Your link is broken. $\endgroup$ – AndrejaKo Dec 18 '16 at 9:41
  • $\begingroup$ But please do not disable it. The RSID is very, very useful. Without the RSID, people don't know which digital mode you are using, so they can't answer you. $\endgroup$ – Walter Underwood K6WRU Jan 20 '17 at 17:01
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    $\begingroup$ PSK31 is by now about as established as RTTY, CW, and SSB, and no one identifies those. Since the RSID bandwidth is significantly more than PSK31 it causes a lot of interference with adjacent stations, to transmit information that's obvious to almost everyone anyway. Please do turn it off unless you are utilizing some other digital mode. $\endgroup$ – Phil Frost - W8II Jan 20 '17 at 18:12

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