fix: Flex with multiple slices opened was always showing slice A s-meter.

internal/ultrabeam/ultrabeam.go

@@ -9,6 +9,7 @@ import (
 	"fmt"
 	"log"
 	"net"
+	"runtime"
 	"sync"
 	"time"
 )
@@ -75,6 +76,20 @@ type Client struct {
 	pendingDir    int
 	pendingDirAt  time.Time
 	pendingDirSet bool
+
+	// lastSetKHz is the frequency we last COMMANDED. Used as the follow-loop
+	// deadband reference when the antenna's own status hasn't reported a frequency
+	// yet (Frequency==0) — otherwise the deadband is bypassed and every small QSY
+	// re-tunes the motors.
+	lastSetKHz int
+}
+
+// LastSetKHz returns the frequency (kHz) most recently commanded to the antenna,
+// or 0 if none yet.
+func (c *Client) LastSetKHz() int {
+	c.statusMu.RLock()
+	defer c.statusMu.RUnlock()
+	return c.lastSetKHz
 }
 
 type Status struct {
@@ -457,6 +472,15 @@ func (c *Client) queryProgress() ([]int, error) {
 
 // SetFrequency changes frequency and optional direction (command 3)
 func (c *Client) SetFrequency(freqKhz int, direction int) error {
+	// Trace WHO asked for the change — the caller's function + line — so an
+	// unexpected antenna QSY (e.g. jumping to 14.074 while on 40m) can be traced
+	// to the follow loop, an immediate re-tune, or a direction re-issue.
+	caller := "?"
+	if pc, _, line, ok := runtime.Caller(1); ok {
+		caller = fmt.Sprintf("%s:%d", runtime.FuncForPC(pc).Name(), line)
+	}
+	log.Printf("Ultrabeam: SetFrequency(%d kHz, dir %d) ← %s", freqKhz, direction, caller)
+
 	data := []byte{
 		byte(freqKhz & 0xFF),
 		byte((freqKhz >> 8) & 0xFF),
@@ -467,6 +491,7 @@ func (c *Client) SetFrequency(freqKhz int, direction int) error {
 	if err == nil {
 		c.statusMu.Lock()
 		c.pendingDir, c.pendingDirAt, c.pendingDirSet = direction, time.Now(), true
+		c.lastSetKHz = freqKhz
 		if c.lastStatus != nil {
 			c.lastStatus.Direction = direction // reflect immediately
 		}