From dc09191f0795408d98f09c6f8e84ba23b0e7cb44 Mon Sep 17 00:00:00 2001
From: Mike Black W9MDB <mdblack98@yahoo.com>
Date: Mon, 18 Oct 2021 15:33:50 -0500
Subject: [PATCH] Add copy A/B for Elecraft K4 to avoid cross-band error when
 setting split https://github.com/Hamlib/Hamlib/issues/825

---
 rigs/kenwood/kenwood.c | 9 ++++++++-
 rigs/kenwood/kenwood.h | 2 +-
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/rigs/kenwood/kenwood.c b/rigs/kenwood/kenwood.c
index e64e361c2..cf132355e 100644
--- a/rigs/kenwood/kenwood.c
+++ b/rigs/kenwood/kenwood.c
@@ -1335,7 +1335,14 @@ int kenwood_set_split_vfo(RIG *rig, vfo_t vfo, split_t split, vfo_t txvfo)
     }
 
     /* set TX VFO */
-    snprintf(cmdbuf, sizeof(cmdbuf), "FT%c", vfo_function);
+    if (rig->caps->rig_model == RIG_MODEL_K4) // K4 needs VFOB to be same band as VFOA
+    {
+        snprintf(cmdbuf, sizeof(cmdbuf), "AB0;FT%c", vfo_function);
+    }
+    else
+    {
+        snprintf(cmdbuf, sizeof(cmdbuf), "FT%c", vfo_function);
+    }
     retval = kenwood_transaction(rig, cmdbuf, NULL, 0);
 
     if (retval != RIG_OK)
diff --git a/rigs/kenwood/kenwood.h b/rigs/kenwood/kenwood.h
index 18dcaa29b..84162c54b 100644
--- a/rigs/kenwood/kenwood.h
+++ b/rigs/kenwood/kenwood.h
@@ -28,7 +28,7 @@
 #include "token.h"
 #include "misc.h"
 
-#define BACKEND_VER "20211015"
+#define BACKEND_VER "20211018"
 
 #define EOM_KEN ';'
 #define EOM_TH '\r'