diff --git a/config_webrx.py b/config_webrx.py
index 75f61b1..0a76aad 100644
--- a/config_webrx.py
+++ b/config_webrx.py
@@ -135,7 +135,6 @@ sdrs = {
                 "name":"20m",
                 "center_freq": 14150000,
                 "rf_gain": 4,
-                "if_gain": 40,
                 "samp_rate": 500000,
                 "start_freq": 14070000,
                 "start_mod": "usb",
@@ -145,7 +144,6 @@ sdrs = {
                 "name":"30m",
                 "center_freq": 10125000,
                 "rf_gain": 4,
-                "if_gain": 40,
                 "samp_rate": 250000,
                 "start_freq": 10142000,
                 "start_mod": "usb"
@@ -154,7 +152,6 @@ sdrs = {
                 "name":"40m",
                 "center_freq": 7100000,
                 "rf_gain": 4,
-                "if_gain": 40,
                 "samp_rate": 500000,
                 "start_freq": 7070000,
                 "start_mod": "usb",
@@ -164,7 +161,6 @@ sdrs = {
                 "name":"80m",
                 "center_freq": 3650000,
                 "rf_gain": 4,
-                "if_gain": 40,
                 "samp_rate": 500000,
                 "start_freq": 3570000,
                 "start_mod": "usb",
@@ -174,7 +170,6 @@ sdrs = {
                 "name": "49m Broadcast",
                 "center_freq": 6000000,
                 "rf_gain": 4,
-                "if_gain": 40,
                 "samp_rate": 500000,
                 "start_freq": 6070000,
                 "start_mod": "am",
diff --git a/owrx/source.py b/owrx/source.py
index 078b06f..66691cc 100644
--- a/owrx/source.py
+++ b/owrx/source.py
@@ -245,7 +245,7 @@ class SdrplaySource(SdrSource):
     def getCommand(self):
         command = "rx_sdr -F CF32 -s {samp_rate} -f {center_freq} -p {ppm}"
         gainMap = { "rf_gain" : "RFGR", "if_gain" : "IFGR"}
-        gains = [ "{0}={{{1}}}".format(gainMap[name], name) for name in self.rtlProps.collect("rf_gain", "if_gain").__dict__() ]
+        gains = [ "{0}={{{1}}}".format(gainMap[name], name) for (name, value) in self.rtlProps.collect("rf_gain", "if_gain").__dict__().items() if value is not None ]
         if gains:
             command += " -g {gains}".format(gains = ",".join(gains))
         if self.rtlProps["antenna"] is not None: