diff --git a/firmware/baseband/proc_aprsrx.hpp b/firmware/baseband/proc_aprsrx.hpp
index 2d3c4568..b6634419 100644
--- a/firmware/baseband/proc_aprsrx.hpp
+++ b/firmware/baseband/proc_aprsrx.hpp
@@ -125,7 +125,7 @@ private:
 	uint32_t sample_bits { 0 };
 	uint32_t phase { }, phase_inc { };
 	int32_t sample_mixed { }, prev_mixed { }, sample_filtered { }, prev_filtered { };
-	uint8_t last_bit;
+	uint8_t last_bit = 0;
 	uint8_t ones_count = 0;
 	uint8_t current_byte = 0;
 	uint8_t byte_index = 0;
@@ -136,7 +136,7 @@ private:
 	bool wait_start { };
 	bool bit_value { };
 
-	aprs::APRSPacket aprs_packet;
+	aprs::APRSPacket aprs_packet  { };
 
 	void configure(const APRSRxConfigureMessage& message);
 	void capture_config(const CaptureConfigMessage& message);
diff --git a/sdcard/FREQMAN/RADIOSONDE.TXT b/sdcard/FREQMAN/RADIOSONDE.TXT
new file mode 100644
index 00000000..de308df5
--- /dev/null
+++ b/sdcard/FREQMAN/RADIOSONDE.TXT
@@ -0,0 +1,46 @@
+f=400500000,d=AU SE
+f=401000000,d=FR
+f=401100000,d=CZ
+f=401400000,d=FR
+f=401500000,d=AU
+f=401590000,d=FR
+f=401600000,d=FR
+f=402000000,d=BR FR GR IT RS
+f=402010000,d=TR
+f=402200000,d=GR
+f=402500000,d=AU DE
+f=402740000,d=GR
+f=402790000,d=RS
+f=402800000,d=GB IT RS
+f=402870000,d=BE
+f=403000000,d=BE BR CZ HU IE IT NL
+f=403010000,d=DE NL TR
+f=403150000,d=DE
+f=403200000,d=HU
+f=403500000,d=BE HU
+f=403530000,d=BY
+f=403600000,d=RO
+f=403700000,d=BR GB
+f=403820000,d=RO
+f=403900000,d=NL
+f=403920000,d=RO
+f=403810000,d=DE
+f=404000000,d=BR CZ ES IT US
+f=404010000,d=US
+f=404020000,d=US
+f=404100000,d=GB
+f=404300000,d=DE
+f=404310000,d=DE
+f=404380000,d=GB
+f=404400000,d=GB
+f=404710000,d=DE
+f=404800000,d=IT
+f=405000000,d=ES
+f=405010000,d=FR
+f=405030000,d=BY
+f=405100000,d=GB
+f=405300000,d=BY ES IE SE
+f=405600000,d=GB
+f=405680000,d=GB
+f=405700000,d=DE GB
+f=405900000,d=DE
\ No newline at end of file