better defaults for rtl-sdr and rtl-tcp sources

rtl_sdr_source/src/main.cpp

@@ -160,7 +160,7 @@ public:
         config.acquire();
         if (!config.conf["devices"].contains(selectedDevName)) {
             created = true;
-            config.conf["devices"][selectedDevName]["sampleRate"] = sampleRate;
+            config.conf["devices"][selectedDevName]["sampleRate"] = 2400000.0;
             config.conf["devices"][selectedDevName]["directSampling"] = directSamplingMode;
             config.conf["devices"][selectedDevName]["biasT"] = biasT;
             config.conf["devices"][selectedDevName]["offsetTuning"] = offsetTuning;

rtl_tcp_source/src/main.cpp

@@ -53,7 +53,7 @@ public:
     RTLTCPSourceModule(std::string name) {
         this->name = name;
 
-        sampleRate = 2560000.0;
+        sampleRate = 2400000.0;
 
         int srCount = sizeof(sampleRatesTxt) / sizeof(char*);
         for (int i = 0; i < srCount; i++) {