diff --git a/include/hamlib/rig.h b/include/hamlib/rig.h
index 8825c8d69..3650026e1 100644
--- a/include/hamlib/rig.h
+++ b/include/hamlib/rig.h
@@ -1153,7 +1153,7 @@ typedef uint64_t rmode_t;
 #define    RIG_MODE_DD        CONSTANT_64BIT_FLAG (32)  /*!< \c DD Mode IC-9700 */
 #define    RIG_MODE_C4FM      CONSTANT_64BIT_FLAG (33)  /*!< \c Yaesu C4FM mode */
 #define    RIG_MODE_PKTFMN    CONSTANT_64BIT_FLAG (34)  /*!< \c Yaesu DATA-FM-N */
-#define    RIG_MODE_BIT35     CONSTANT_64BIT_FLAG (35)  /*!< \c reserved for future expansion */
+#define    RIG_MODE_SPEC      CONSTANT_64BIT_FLAG (35)  /*!< \c Unfiltered as in PowerSDR */
 #define    RIG_MODE_BIT36     CONSTANT_64BIT_FLAG (36)  /*!< \c reserved for future expansion */
 #define    RIG_MODE_BIT37     CONSTANT_64BIT_FLAG (37)  /*!< \c reserved for future expansion */
 #define    RIG_MODE_BIT38     CONSTANT_64BIT_FLAG (38)  /*!< \c reserved for future expansion */
diff --git a/rigs/dummy/flrig.c b/rigs/dummy/flrig.c
index bb6bb9bef..4f7f02393 100644
--- a/rigs/dummy/flrig.c
+++ b/rigs/dummy/flrig.c
@@ -908,7 +908,8 @@ static int flrig_open(RIG *rig)
         else if (streq(p, "WFM")) { modeMapAdd(&modes, RIG_MODE_WFM, p); }
         else if (streq(p, "UCW")) { modeMapAdd(&modes, RIG_MODE_CW, p); }
         else if (streq(p, "C4FM")) { modeMapAdd(&modes, RIG_MODE_C4FM, p); }
-        else if (streq(p, "SPEC") || streq(p,"DRM"))
+        else if (streq(p, "SPEC")) { modeMapAdd(&modes, RIG_MODE_SPEC, p); }
+        else if (streq(p,"DRM")) // we don't support DRM yet (or maybe ever)
         {
             rig_debug(RIG_DEBUG_VERBOSE, "%s: no mapping for mode %s\n", __func__, p);
         }
diff --git a/rigs/dummy/flrig.h b/rigs/dummy/flrig.h
index 9e017c2c9..0f5a7fa4d 100644
--- a/rigs/dummy/flrig.h
+++ b/rigs/dummy/flrig.h
@@ -28,7 +28,7 @@
 #include <sys/time.h>
 #endif
 
-#define BACKEND_VER "20201226"
+#define BACKEND_VER "20201227"
 
 #define EOM "\r"
 #define TRUE 1
diff --git a/rigs/kenwood/flex6xxx.c b/rigs/kenwood/flex6xxx.c
index 492d5205a..83c2249fd 100644
--- a/rigs/kenwood/flex6xxx.c
+++ b/rigs/kenwood/flex6xxx.c
@@ -49,6 +49,8 @@
 #define F6K_ANTS (RIG_ANT_1|RIG_ANT_2|RIG_ANT_3)
 
 /* PowerSDR differences */
+#define POWERSDR_MODES (RIG_MODE_CW|RIG_MODE_SSB|RIG_MODE_AM|RIG_MODE_FM|RIG_MODE_PKTLSB|RIG_MODE_PKTUSB|RIG_MODE_SPEC)
+
 #define POWERSDR_FUNC_ALL (RIG_FUNC_VOX|RIG_FUNC_SQL|RIG_FUNC_NB|RIG_FUNC_ANF|RIG_FUNC_MUTE|RIG_FUNC_RIT|RIG_FUNC_XIT|RIG_FUNC_TUNER)
 
 #define POWERSDR_LEVEL_ALL (RIG_LEVEL_SLOPE_HIGH|RIG_LEVEL_SLOPE_LOW|RIG_LEVEL_KEYSPD|RIG_LEVEL_RFPOWER_METER|RIG_LEVEL_RFPOWER_METER_WATTS|RIG_LEVEL_MICGAIN|RIG_LEVEL_VOXGAIN|RIG_LEVEL_SQL|RIG_LEVEL_AF|RIG_LEVEL_AGC|RIG_LEVEL_RF|RIG_LEVEL_IF)
@@ -1206,31 +1208,31 @@ const struct rig_caps powersdr_caps =
     .chan_list =        { RIG_CHAN_END },
 
     .rx_range_list1 =  {
-        {kHz(30), MHz(77), F6K_MODES, -1, -1, F6K_VFO, F6K_ANTS},
-        {MHz(135), MHz(165), F6K_MODES, -1, - 1, F6K_VFO, F6K_ANTS},
+        {kHz(30), MHz(77), POWERSDR_MODES, -1, -1, F6K_VFO, F6K_ANTS},
+        {MHz(135), MHz(165), POWERSDR_MODES, -1, - 1, F6K_VFO, F6K_ANTS},
         RIG_FRNG_END,
     }, /* rx range */
     .tx_range_list1 =  {
-        FRQ_RNG_HF(1, F6K_MODES, mW(10), W(100), F6K_VFO, F6K_ANTS),
-        FRQ_RNG_6m(1, F6K_MODES, mW(10), W(100), F6K_VFO, F6K_ANTS),
-        FRQ_RNG_2m(1, F6K_MODES, mW(10), W(100), F6K_VFO, F6K_ANTS),
+        FRQ_RNG_HF(1, POWERSDR_MODES, mW(10), W(100), F6K_VFO, F6K_ANTS),
+        FRQ_RNG_6m(1, POWERSDR_MODES, mW(10), W(100), F6K_VFO, F6K_ANTS),
+        FRQ_RNG_2m(1, POWERSDR_MODES, mW(10), W(100), F6K_VFO, F6K_ANTS),
         RIG_FRNG_END,
     }, /* tx range */
 
     .rx_range_list2 =  {
-        {kHz(30), MHz(77), F6K_MODES, -1, -1, F6K_VFO, F6K_ANTS},
-        { MHz(135), MHz(165), F6K_MODES, -1, -1, F6K_VFO, F6K_ANTS},
+        {kHz(30), MHz(77), POWERSDR_MODES, -1, -1, F6K_VFO, F6K_ANTS},
+        { MHz(135), MHz(165), POWERSDR_MODES, -1, -1, F6K_VFO, F6K_ANTS},
         RIG_FRNG_END,
     }, /* rx range */
     .tx_range_list2 =  {
-        FRQ_RNG_HF(2, F6K_MODES, mW(10), W(100), F6K_VFO, F6K_ANTS),
-        FRQ_RNG_6m(2, F6K_MODES, mW(10), W(100), F6K_VFO, F6K_ANTS),
-        FRQ_RNG_2m(2, F6K_MODES, mW(10), W(100), F6K_VFO, F6K_ANTS),
+        FRQ_RNG_HF(2, POWERSDR_MODES, mW(10), W(100), F6K_VFO, F6K_ANTS),
+        FRQ_RNG_6m(2, POWERSDR_MODES, mW(10), W(100), F6K_VFO, F6K_ANTS),
+        FRQ_RNG_2m(2, POWERSDR_MODES, mW(10), W(100), F6K_VFO, F6K_ANTS),
         RIG_FRNG_END,
     }, /* tx range */
 
     .tuning_steps =  {
-        {F6K_MODES, 1},
+        {POWERSDR_MODES, 1},
         RIG_TS_END,
     },