diff --git a/src/main/java/ru/r2cloud/jradio/geoscan/Geoscan.java b/src/main/java/ru/r2cloud/jradio/geoscan/Geoscan.java
index 9173fbb3..73872834 100644
--- a/src/main/java/ru/r2cloud/jradio/geoscan/Geoscan.java
+++ b/src/main/java/ru/r2cloud/jradio/geoscan/Geoscan.java
@@ -5,6 +5,7 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import ru.r2cloud.jradio.Beacon;
 import ru.r2cloud.jradio.BeaconSource;
 import ru.r2cloud.jradio.ByteInput;
 import ru.r2cloud.jradio.blocks.AdditiveScrambler;
@@ -14,19 +15,25 @@
 import ru.r2cloud.jradio.crc.Crc16Cc11xx;
 import ru.r2cloud.jradio.fec.ccsds.UncorrectableException;
 
-public class Geoscan extends BeaconSource<GeoscanBeacon> {
+public class Geoscan<T extends Beacon> extends BeaconSource<T> {
 
 	private static final Logger LOG = LoggerFactory.getLogger(Geoscan.class);
 
 	private final AdditiveScrambler scrambler;
+	private final Class<T> clazz;
 
-	public Geoscan(ByteInput demod) {
-		super(new CorrelateSyncword(new SoftToHard(demod), 4, "10010011000010110101000111011110", 66 * 8));
+	public Geoscan(ByteInput demod, Class<T> clazz) {
+		this(demod, clazz, 66);
+	}
+
+	public Geoscan(ByteInput demod, Class<T> clazz, int beaconSizeBytes) {
+		super(new CorrelateSyncword(new SoftToHard(demod), 4, "10010011000010110101000111011110", beaconSizeBytes * 8));
 		scrambler = new AdditiveScrambler(0x21, 0x1ff, 8, 8);
+		this.clazz = clazz;
 	}
 
 	@Override
-	protected GeoscanBeacon parseBeacon(byte[] raw) throws UncorrectableException, IOException {
+	protected T parseBeacon(byte[] raw) throws UncorrectableException, IOException {
 		raw = UnpackedToPacked.pack(raw);
 		scrambler.shuffle(raw);
 		if (Crc16Cc11xx.calculate(raw, 0, raw.length) != 0) {
@@ -38,7 +45,13 @@ protected GeoscanBeacon parseBeacon(byte[] raw) throws UncorrectableException, I
 		// cutoff crc
 		byte[] payload = new byte[raw.length - 2];
 		System.arraycopy(raw, 0, payload, 0, payload.length);
-		GeoscanBeacon result = new GeoscanBeacon();
+		T result;
+		try {
+			result = clazz.getDeclaredConstructor().newInstance();
+		} catch (Exception e) {
+			LOG.error("unable to init beacon", e);
+			return null;
+		}
 		result.readExternal(payload);
 		return result;
 	}
diff --git a/src/main/java/ru/r2cloud/jradio/sstk1/StratosatTk1.java b/src/main/java/ru/r2cloud/jradio/sstk1/StratosatTk1.java
deleted file mode 100644
index 853eb230..00000000
--- a/src/main/java/ru/r2cloud/jradio/sstk1/StratosatTk1.java
+++ /dev/null
@@ -1,46 +0,0 @@
-package ru.r2cloud.jradio.sstk1;
-
-import java.io.IOException;
-
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-import ru.r2cloud.jradio.BeaconSource;
-import ru.r2cloud.jradio.ByteInput;
-import ru.r2cloud.jradio.blocks.AdditiveScrambler;
-import ru.r2cloud.jradio.blocks.CorrelateSyncword;
-import ru.r2cloud.jradio.blocks.SoftToHard;
-import ru.r2cloud.jradio.blocks.UnpackedToPacked;
-import ru.r2cloud.jradio.crc.Crc16Cc11xx;
-import ru.r2cloud.jradio.fec.ccsds.UncorrectableException;
-
-public class StratosatTk1 extends BeaconSource<StratosatTk1Beacon> {
-
-	private static final Logger LOG = LoggerFactory.getLogger(StratosatTk1.class);
-	private final AdditiveScrambler scrambler;
-
-	public StratosatTk1(ByteInput demod) {
-		this(demod, 66);
-	}
-
-	public StratosatTk1(ByteInput demod, int beaconSizeBytes) {
-		super(new CorrelateSyncword(new SoftToHard(demod), 4, "10010011000010110101000111011110", beaconSizeBytes * 8));
-		scrambler = new AdditiveScrambler(0x21, 0x1ff, 8, 8);
-	}
-
-	@Override
-	protected StratosatTk1Beacon parseBeacon(byte[] raw) throws UncorrectableException, IOException {
-		raw = UnpackedToPacked.pack(raw);
-		scrambler.shuffle(raw);
-		if (Crc16Cc11xx.calculate(raw, 0, raw.length) != 0) {
-			if (LOG.isDebugEnabled()) {
-				LOG.debug("crc mismatch");
-			}
-			return null;
-		}
-		StratosatTk1Beacon result = new StratosatTk1Beacon();
-		result.readExternal(raw);
-		return result;
-	}
-
-}
diff --git a/src/test/java/ru/r2cloud/jradio/geoscan/GeoscanTest.java b/src/test/java/ru/r2cloud/jradio/geoscan/GeoscanTest.java
index d6c64d47..c840f46a 100644
--- a/src/test/java/ru/r2cloud/jradio/geoscan/GeoscanTest.java
+++ b/src/test/java/ru/r2cloud/jradio/geoscan/GeoscanTest.java
@@ -10,15 +10,14 @@
 import ru.r2cloud.jradio.source.WavFileSource;
 
 public class GeoscanTest {
-	
-	
-	private Geoscan input;
+
+	private Geoscan<GeoscanBeacon> input;
 
 	@Test
 	public void testDecodeTelemetry() throws Exception {
 		WavFileSource source = new WavFileSource(GeoscanTest.class.getClassLoader().getResourceAsStream("geoscan.wav"));
 		FskDemodulator demod = new FskDemodulator(source, 9600, 5000.0f, 1, 2000.0f, true);
-		input = new Geoscan(demod);
+		input = new Geoscan<>(demod, GeoscanBeacon.class);
 		assertTrue(input.hasNext());
 		AssertJson.assertObjectsEqual("GeoscanBeacon.json", input.next());
 	}
@@ -30,5 +29,4 @@ public void stop() throws Exception {
 		}
 	}
 
-
 }
diff --git a/src/test/java/ru/r2cloud/jradio/sstk1/StratosatTk1Test.java b/src/test/java/ru/r2cloud/jradio/sstk1/StratosatTk1Test.java
index 1eabf025..51f8cf64 100644
--- a/src/test/java/ru/r2cloud/jradio/sstk1/StratosatTk1Test.java
+++ b/src/test/java/ru/r2cloud/jradio/sstk1/StratosatTk1Test.java
@@ -11,17 +11,18 @@
 
 import ru.r2cloud.jradio.AssertJson;
 import ru.r2cloud.jradio.demod.FskDemodulator;
+import ru.r2cloud.jradio.geoscan.Geoscan;
 import ru.r2cloud.jradio.source.WavFileSource;
 
 public class StratosatTk1Test {
 
-	private StratosatTk1 input;
+	private Geoscan<StratosatTk1Beacon> input;
 
 	@Test
 	public void testDecodeTelemetry() throws Exception {
 		WavFileSource source = new WavFileSource(StratosatTk1Test.class.getClassLoader().getResourceAsStream("sstk1.wav"));
 		FskDemodulator demod = new FskDemodulator(source, 9600, 5000.0f, 1, 2000.0f, true);
-		input = new StratosatTk1(demod);
+		input = new Geoscan<>(demod, StratosatTk1Beacon.class);
 		assertTrue(input.hasNext());
 		input.next();
 		AssertJson.assertObjectsEqual("StratosatTk1.json", input.next());
diff --git a/src/test/resources/expected/StratosatTk1.json b/src/test/resources/expected/StratosatTk1.json
index 9f319e8f..041f7103 100644
--- a/src/test/resources/expected/StratosatTk1.json
+++ b/src/test/resources/expected/StratosatTk1.json
@@ -104,9 +104,7 @@
     0,
     0,
     0,
-    0,
-    -85,
-    -3
+    0
   ],
   "beginSample": 1796,
   "beginMillis": 0,