diff --git a/static/index.html b/static/index.html
index ea177a3..f6a7a4a 100644
--- a/static/index.html
+++ b/static/index.html
@@ -189,16 +189,6 @@
 				<div class="column">
 					<div class="box">
 						<h2 class="title" data-i18n="heading.knobs">Knobs</h2>
-						<div class="block">
-							<div class="control">
-								<button id="ck" class="button is-primary">
-									CK
-								</button>
-							</div>
-							<div class="" data-i18n="description.ck">
-								Send <code>CK</code> (check) to the repeater, and play when it comes back.
-							</div>
-						</div>
 						<div class="block">
 							<div class="control">
 								<button id="reset" class="button" data-i18n="label.reset">
diff --git a/static/scripts/vail.mjs b/static/scripts/vail.mjs
index 6d996da..9e27b09 100644
--- a/static/scripts/vail.mjs
+++ b/static/scripts/vail.mjs
@@ -54,9 +54,6 @@ class VailClient {
 		for (let e of document.querySelectorAll("button.maximize")) {
 			e.addEventListener("click", e => this.maximize(e))
 		}
-		for (let e of document.querySelectorAll("#ck")) {
-			e.addEventListener("click", e => this.check())
-		}
 		for (let e of document.querySelectorAll("#reset")) {
 			e.addEventListener("click", e => this.reset())
 		}
@@ -65,9 +62,9 @@ class VailClient {
 		this.inputInit("#keyer-mode", e => this.setKeyer(e.target.value))
 		this.inputInit("#keyer-rate", e => {
 			let rate = e.target.value
-			this.ditDuration = Minute / rate / 50
+			this.ditDuration = Math.round(Minute / rate / 50)
 			for (let e of document.querySelectorAll("[data-fill='keyer-ms']")) {
-				e.textContent = this.ditDuration.toFixed(0)
+				e.textContent = this.ditDuration
 			}
 			this.keyer.SetDitDuration(this.ditDuration)
 			this.roboKeyer.SetDitDuration(this.ditDuration)
@@ -419,30 +416,6 @@ class VailClient {
 		console.log(element)
 	}
 
-	/**
-	  * Send "CK" to server, and don't squelch the echo
-	  */
-	 check() {
-		let when = Date.now()
-		let dit = this.ditDuration
-		let dah = dit * 3
-		let s = dit
-		let message = [
-			dah, s, dit, s, dah, s, dit,
-			s * 3,
-			dah, s, dit, s, dah
-		]
-
-		this.repeater.Transmit(when, 0) // Get round-trip time
-		for (let i in message) {
-			let duration = message[i]
-			if (i % 2 == 0) {
-				this.repeater.Transmit(when, duration, false)
-			}
-			when += duration
-		}
-	}
-
 	/** Reset to factory defaults */
 	reset() {
 		localStorage.clear()