Add 50/70 MHz band support (table, NOT-QRV, station setup, loggers)

Issue #68

Adds Band.B_50/B_70 and wires them through the same band-opportunity
machinery as the other bands: X/a/B+/o table columns and filter button
in the User table and the Workedstn database table, NOT-QRV checkboxes
and propagation across callsign variants, "My station uses 6m/4m band"
toggles, station-name detection ("50", "6M", "70MHZ", "4M" - without
stealing the existing bare "70"/"6" cm-band shorthand), Win-Test sked
band IDs (10/50MHz, 11/70MHz), and UCX-logger worked-band recognition.

Persists worked50/70 and notQRV50/70 via an additive SQLite migration
(same ensureColumnExists pattern as the earlier v1.1->v1.2 migration),
verified against a real database file.

ReachabilityService.resolveAutoBand() now also falls back to 50 MHz
(then 70 MHz) for stations in the "50/70 MHz" chat category, mirroring
the existing Microwave-category fallback to 23cm.

Assisted by Claude Sonnet 5 <noreply@anthropic.com>

src/main/java/kst4contest/controller/ChatController.java

@@ -303,6 +303,8 @@ public class ChatController implements ThreadStatusCallback, PstRotatorEventList
 	private static String bandToHumanLabel(Band b) {
 		if (b == null) return "?";
 		return switch (b) {
+			case B_50 -> "6m";
+			case B_70 -> "4m";
 			case B_144 -> "2m";
 			case B_432 -> "70cm";
 			case B_1296 -> "23cm";
@@ -1318,6 +1320,8 @@ private ObservableList<String>
 				continue;
 			}
 
+			target.setQrv50(sourceMember.isQrv50());
+			target.setQrv70(sourceMember.isQrv70());
 			target.setQrv144(sourceMember.isQrv144());
 			target.setQrv432(sourceMember.isQrv432());
 			target.setQrv1240(sourceMember.isQrv1240());
@@ -2922,6 +2926,8 @@ private ObservableList<String>
 			activeChatMember.setWorked3400(storedChatMemberState.isWorked3400());
 			activeChatMember.setWorked5600(storedChatMemberState.isWorked5600());
 			activeChatMember.setWorked10G(storedChatMemberState.isWorked10G());
+			activeChatMember.setWorked50(storedChatMemberState.isWorked50());
+			activeChatMember.setWorked70(storedChatMemberState.isWorked70());
 			activeChatMember.setQrv144(storedChatMemberState.isQrv144());
 			activeChatMember.setQrv432(storedChatMemberState.isQrv432());
 			activeChatMember.setQrv1240(storedChatMemberState.isQrv1240());
@@ -2929,6 +2935,8 @@ private ObservableList<String>
 			activeChatMember.setQrv3400(storedChatMemberState.isQrv3400());
 			activeChatMember.setQrv5600(storedChatMemberState.isQrv5600());
 			activeChatMember.setQrv10G(storedChatMemberState.isQrv10G());
+			activeChatMember.setQrv50(storedChatMemberState.isQrv50());
+			activeChatMember.setQrv70(storedChatMemberState.isQrv70());
 		}
 	}
 

src/main/java/kst4contest/controller/DBController.java

@@ -145,6 +145,7 @@ public class DBController {
 		createWorkedGrossFieldTableIfRequired();
 		versionUpdateOfDBCheckAndChangeV11ToV12();
 		versionUpdateOfDBCheckAndChangeV12ToV13();
+		versionUpdateOfDBCheckAndChangeV13ToV14();
 
 		if (helper_isDatabaseSchemaVersionOlderThanCurrent() || helper_isCallsignNormalizationMigrationRequired()) {
 			normalizeStoredCallsignsToRawCallsigns();
@@ -230,6 +231,8 @@ public class DBController {
 						+ "worked3400 BOOLEAN DEFAULT 0, "
 						+ "worked5600 BOOLEAN DEFAULT 0, "
 						+ "worked10G BOOLEAN DEFAULT 0, "
+						+ "worked50 BOOLEAN DEFAULT 0, "
+						+ "worked70 BOOLEAN DEFAULT 0, "
 						+ "notQRV144 BOOLEAN DEFAULT 0, "
 						+ "notQRV432 BOOLEAN DEFAULT 0, "
 						+ "notQRV1240 BOOLEAN DEFAULT 0, "
@@ -237,6 +240,8 @@ public class DBController {
 						+ "notQRV3400 BOOLEAN DEFAULT 0, "
 						+ "notQRV5600 BOOLEAN DEFAULT 0, "
 						+ "notQRV10G BOOLEAN DEFAULT 0, "
+						+ "notQRV50 BOOLEAN DEFAULT 0, "
+						+ "notQRV70 BOOLEAN DEFAULT 0, "
 						+ "lastFlagsChangeEpochMs INTEGER DEFAULT 0"
 						+ ");";
 
@@ -303,6 +308,22 @@ public class DBController {
 		}
 	}
 
+	/**
+	 * Updates old v1.3 databases to the v1.4 schema by adding the worked/not-QRV
+	 * columns for the 50 MHz and 70 MHz bands if they are missing.
+	 */
+	public synchronized void versionUpdateOfDBCheckAndChangeV13ToV14() {
+
+		try {
+			ensureColumnExists("ChatMember", "worked50", "BOOLEAN DEFAULT 0");
+			ensureColumnExists("ChatMember", "worked70", "BOOLEAN DEFAULT 0");
+			ensureColumnExists("ChatMember", "notQRV50", "BOOLEAN DEFAULT 0");
+			ensureColumnExists("ChatMember", "notQRV70", "BOOLEAN DEFAULT 0");
+		} catch (SQLException e) {
+			throw new RuntimeException("[DBH, ERROR:] Could not migrate database from v1.3 to v1.4", e);
+		}
+	}
+
 	/**
 	 * Adds a missing column to an existing table. This method is used for safe schema
 	 * upgrades on customer systems which still contain older database files.
@@ -452,7 +473,11 @@ public class DBController {
 		targetChatMember.setWorked3400(targetChatMember.isWorked3400() || sourceChatMember.isWorked3400());
 		targetChatMember.setWorked5600(targetChatMember.isWorked5600() || sourceChatMember.isWorked5600());
 		targetChatMember.setWorked10G(targetChatMember.isWorked10G() || sourceChatMember.isWorked10G());
+		targetChatMember.setWorked50(targetChatMember.isWorked50() || sourceChatMember.isWorked50());
+		targetChatMember.setWorked70(targetChatMember.isWorked70() || sourceChatMember.isWorked70());
 
+		targetChatMember.setQrv50(targetChatMember.isQrv50() && sourceChatMember.isQrv50());
+		targetChatMember.setQrv70(targetChatMember.isQrv70() && sourceChatMember.isQrv70());
 		targetChatMember.setQrv144(targetChatMember.isQrv144() && sourceChatMember.isQrv144());
 		targetChatMember.setQrv432(targetChatMember.isQrv432() && sourceChatMember.isQrv432());
 		targetChatMember.setQrv1240(targetChatMember.isQrv1240() && sourceChatMember.isQrv1240());
@@ -491,6 +516,8 @@ public class DBController {
 						+ "worked3400 = 0, "
 						+ "worked5600 = 0, "
 						+ "worked10G = 0, "
+						+ "worked50 = 0, "
+						+ "worked70 = 0, "
 						+ "notQRV144 = 0, "
 						+ "notQRV432 = 0, "
 						+ "notQRV1240 = 0, "
@@ -498,6 +525,8 @@ public class DBController {
 						+ "notQRV3400 = 0, "
 						+ "notQRV5600 = 0, "
 						+ "notQRV10G = 0, "
+						+ "notQRV50 = 0, "
+						+ "notQRV70 = 0, "
 						+ "lastFlagsChangeEpochMs = 0 "
 						+ "WHERE lastFlagsChangeEpochMs > 0 AND lastFlagsChangeEpochMs < ?;";
 
@@ -534,9 +563,9 @@ public class DBController {
 
 		String insertOrUpdateSql =
 				"INSERT INTO ChatMember ("
-						+ "callsign, qra, name, lastActivityDateTime, worked, worked144, worked432, worked1240, worked2300, worked3400, worked5600, worked10G, "
+						+ "callsign, qra, name, lastActivityDateTime, worked, worked144, worked432, worked1240, worked2300, worked3400, worked5600, worked10G, worked50, worked70, "
-						+ "notQRV144, notQRV432, notQRV1240, notQRV2300, notQRV3400, notQRV5600, notQRV10G, lastFlagsChangeEpochMs"
+						+ "notQRV144, notQRV432, notQRV1240, notQRV2300, notQRV3400, notQRV5600, notQRV10G, notQRV50, notQRV70, lastFlagsChangeEpochMs"
-						+ ") VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?) "
+						+ ") VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?) "
 						+ "ON CONFLICT(callsign) DO UPDATE SET "
 						+ "qra = excluded.qra, "
 						+ "name = excluded.name, "
@@ -557,14 +586,18 @@ public class DBController {
 			preparedStatement.setInt(10, helper_booleanIntConverter(chatMemberToStore.isWorked3400()));
 			preparedStatement.setInt(11, helper_booleanIntConverter(chatMemberToStore.isWorked5600()));
 			preparedStatement.setInt(12, helper_booleanIntConverter(chatMemberToStore.isWorked10G()));
-			preparedStatement.setInt(13, helper_booleanIntConverter(!chatMemberToStore.isQrv144()));
+			preparedStatement.setInt(13, helper_booleanIntConverter(chatMemberToStore.isWorked50()));
-			preparedStatement.setInt(14, helper_booleanIntConverter(!chatMemberToStore.isQrv432()));
+			preparedStatement.setInt(14, helper_booleanIntConverter(chatMemberToStore.isWorked70()));
-			preparedStatement.setInt(15, helper_booleanIntConverter(!chatMemberToStore.isQrv1240()));
+			preparedStatement.setInt(15, helper_booleanIntConverter(!chatMemberToStore.isQrv144()));
-			preparedStatement.setInt(16, helper_booleanIntConverter(!chatMemberToStore.isQrv2300()));
+			preparedStatement.setInt(16, helper_booleanIntConverter(!chatMemberToStore.isQrv432()));
-			preparedStatement.setInt(17, helper_booleanIntConverter(!chatMemberToStore.isQrv3400()));
+			preparedStatement.setInt(17, helper_booleanIntConverter(!chatMemberToStore.isQrv1240()));
-			preparedStatement.setInt(18, helper_booleanIntConverter(!chatMemberToStore.isQrv5600()));
+			preparedStatement.setInt(18, helper_booleanIntConverter(!chatMemberToStore.isQrv2300()));
-			preparedStatement.setInt(19, helper_booleanIntConverter(!chatMemberToStore.isQrv10G()));
+			preparedStatement.setInt(19, helper_booleanIntConverter(!chatMemberToStore.isQrv3400()));
-			preparedStatement.setLong(20, resolvedLastFlagsChangeEpochMs);
+			preparedStatement.setInt(20, helper_booleanIntConverter(!chatMemberToStore.isQrv5600()));
+			preparedStatement.setInt(21, helper_booleanIntConverter(!chatMemberToStore.isQrv10G()));
+			preparedStatement.setInt(22, helper_booleanIntConverter(!chatMemberToStore.isQrv50()));
+			preparedStatement.setInt(23, helper_booleanIntConverter(!chatMemberToStore.isQrv70()));
+			preparedStatement.setLong(24, resolvedLastFlagsChangeEpochMs);
 			preparedStatement.executeUpdate();
 		} catch (SQLException e) {
 			System.err.println("[DBH, ERROR:] Chatmember could not been stored.");
@@ -646,8 +679,8 @@ public class DBController {
 
 		String resetAllWorkedDataSql =
 				"UPDATE ChatMember SET "
-						+ "worked = 0, worked144 = 0, worked432 = 0, worked1240 = 0, worked2300 = 0, worked3400 = 0, worked5600 = 0, worked10G = 0, "
+						+ "worked = 0, worked144 = 0, worked432 = 0, worked1240 = 0, worked2300 = 0, worked3400 = 0, worked5600 = 0, worked10G = 0, worked50 = 0, worked70 = 0, "
-						+ "notQRV144 = 0, notQRV432 = 0, notQRV1240 = 0, notQRV2300 = 0, notQRV3400 = 0, notQRV5600 = 0, notQRV10G = 0, "
+						+ "notQRV144 = 0, notQRV432 = 0, notQRV1240 = 0, notQRV2300 = 0, notQRV3400 = 0, notQRV5600 = 0, notQRV10G = 0, notQRV50 = 0, notQRV70 = 0, "
 						+ "lastFlagsChangeEpochMs = 0;";
 
 		try (Statement statement = connection.createStatement()) {
@@ -781,6 +814,8 @@ public class DBController {
 						+ "notQRV3400 = ?, "
 						+ "notQRV5600 = ?, "
 						+ "notQRV10G = ?, "
+						+ "notQRV50 = ?, "
+						+ "notQRV70 = ?, "
 						+ "lastFlagsChangeEpochMs = ? "
 						+ "WHERE callsign = ?;";
 
@@ -792,8 +827,10 @@ public class DBController {
 			preparedStatement.setInt(5, helper_booleanIntConverter(!chatMemberToStore.isQrv3400()));
 			preparedStatement.setInt(6, helper_booleanIntConverter(!chatMemberToStore.isQrv5600()));
 			preparedStatement.setInt(7, helper_booleanIntConverter(!chatMemberToStore.isQrv10G()));
-			preparedStatement.setLong(8, System.currentTimeMillis());
+			preparedStatement.setInt(8, helper_booleanIntConverter(!chatMemberToStore.isQrv50()));
-			preparedStatement.setString(9, chatMemberToStore.getCallSignRaw());
+			preparedStatement.setInt(9, helper_booleanIntConverter(!chatMemberToStore.isQrv70()));
+			preparedStatement.setLong(10, System.currentTimeMillis());
+			preparedStatement.setString(11, chatMemberToStore.getCallSignRaw());
 
 			int affectedRows = preparedStatement.executeUpdate();
 
@@ -821,9 +858,9 @@ public class DBController {
 
 		String upsertCompleteRowSql =
 				"INSERT INTO ChatMember ("
-						+ "callsign, qra, name, lastActivityDateTime, worked, worked144, worked432, worked1240, worked2300, worked3400, worked5600, worked10G, "
+						+ "callsign, qra, name, lastActivityDateTime, worked, worked144, worked432, worked1240, worked2300, worked3400, worked5600, worked10G, worked50, worked70, "
-						+ "notQRV144, notQRV432, notQRV1240, notQRV2300, notQRV3400, notQRV5600, notQRV10G, lastFlagsChangeEpochMs"
+						+ "notQRV144, notQRV432, notQRV1240, notQRV2300, notQRV3400, notQRV5600, notQRV10G, notQRV50, notQRV70, lastFlagsChangeEpochMs"
-						+ ") VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?) "
+						+ ") VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?) "
 						+ "ON CONFLICT(callsign) DO UPDATE SET "
 						+ "qra = excluded.qra, "
 						+ "name = excluded.name, "
@@ -836,6 +873,8 @@ public class DBController {
 						+ "worked3400 = excluded.worked3400, "
 						+ "worked5600 = excluded.worked5600, "
 						+ "worked10G = excluded.worked10G, "
+						+ "worked50 = excluded.worked50, "
+						+ "worked70 = excluded.worked70, "
 						+ "notQRV144 = excluded.notQRV144, "
 						+ "notQRV432 = excluded.notQRV432, "
 						+ "notQRV1240 = excluded.notQRV1240, "
@@ -843,6 +882,8 @@ public class DBController {
 						+ "notQRV3400 = excluded.notQRV3400, "
 						+ "notQRV5600 = excluded.notQRV5600, "
 						+ "notQRV10G = excluded.notQRV10G, "
+						+ "notQRV50 = excluded.notQRV50, "
+						+ "notQRV70 = excluded.notQRV70, "
 						+ "lastFlagsChangeEpochMs = excluded.lastFlagsChangeEpochMs;";
 
 		try (PreparedStatement preparedStatement = connection.prepareStatement(upsertCompleteRowSql)) {
@@ -858,14 +899,18 @@ public class DBController {
 			preparedStatement.setInt(10, helper_booleanIntConverter(chatMemberToStore.isWorked3400()));
 			preparedStatement.setInt(11, helper_booleanIntConverter(chatMemberToStore.isWorked5600()));
 			preparedStatement.setInt(12, helper_booleanIntConverter(chatMemberToStore.isWorked10G()));
-			preparedStatement.setInt(13, helper_booleanIntConverter(!chatMemberToStore.isQrv144()));
+			preparedStatement.setInt(13, helper_booleanIntConverter(chatMemberToStore.isWorked50()));
-			preparedStatement.setInt(14, helper_booleanIntConverter(!chatMemberToStore.isQrv432()));
+			preparedStatement.setInt(14, helper_booleanIntConverter(chatMemberToStore.isWorked70()));
-			preparedStatement.setInt(15, helper_booleanIntConverter(!chatMemberToStore.isQrv1240()));
+			preparedStatement.setInt(15, helper_booleanIntConverter(!chatMemberToStore.isQrv144()));
-			preparedStatement.setInt(16, helper_booleanIntConverter(!chatMemberToStore.isQrv2300()));
+			preparedStatement.setInt(16, helper_booleanIntConverter(!chatMemberToStore.isQrv432()));
-			preparedStatement.setInt(17, helper_booleanIntConverter(!chatMemberToStore.isQrv3400()));
+			preparedStatement.setInt(17, helper_booleanIntConverter(!chatMemberToStore.isQrv1240()));
-			preparedStatement.setInt(18, helper_booleanIntConverter(!chatMemberToStore.isQrv5600()));
+			preparedStatement.setInt(18, helper_booleanIntConverter(!chatMemberToStore.isQrv2300()));
-			preparedStatement.setInt(19, helper_booleanIntConverter(!chatMemberToStore.isQrv10G()));
+			preparedStatement.setInt(19, helper_booleanIntConverter(!chatMemberToStore.isQrv3400()));
-			preparedStatement.setLong(20, chatMemberToStore.getLastFlagsChangeEpochMs());
+			preparedStatement.setInt(20, helper_booleanIntConverter(!chatMemberToStore.isQrv5600()));
+			preparedStatement.setInt(21, helper_booleanIntConverter(!chatMemberToStore.isQrv10G()));
+			preparedStatement.setInt(22, helper_booleanIntConverter(!chatMemberToStore.isQrv50()));
+			preparedStatement.setInt(23, helper_booleanIntConverter(!chatMemberToStore.isQrv70()));
+			preparedStatement.setLong(24, chatMemberToStore.getLastFlagsChangeEpochMs());
 			preparedStatement.executeUpdate();
 		} catch (SQLException e) {
 			throw new RuntimeException("[DBH, ERROR:] Could not rebuild normalized ChatMember row", e);
@@ -894,6 +939,8 @@ public class DBController {
 		builtChatMember.setWorked3400(helper_IntToBooleanConverter(resultSet.getInt("worked3400")));
 		builtChatMember.setWorked5600(helper_IntToBooleanConverter(resultSet.getInt("worked5600")));
 		builtChatMember.setWorked10G(helper_IntToBooleanConverter(resultSet.getInt("worked10G")));
+		builtChatMember.setWorked50(helper_IntToBooleanConverter(resultSet.getInt("worked50")));
+		builtChatMember.setWorked70(helper_IntToBooleanConverter(resultSet.getInt("worked70")));
 		builtChatMember.setQrv144(!helper_IntToBooleanConverter(resultSet.getInt("notQRV144")));
 		builtChatMember.setQrv432(!helper_IntToBooleanConverter(resultSet.getInt("notQRV432")));
 		builtChatMember.setQrv1240(!helper_IntToBooleanConverter(resultSet.getInt("notQRV1240")));
@@ -901,6 +948,8 @@ public class DBController {
 		builtChatMember.setQrv3400(!helper_IntToBooleanConverter(resultSet.getInt("notQRV3400")));
 		builtChatMember.setQrv5600(!helper_IntToBooleanConverter(resultSet.getInt("notQRV5600")));
 		builtChatMember.setQrv10G(!helper_IntToBooleanConverter(resultSet.getInt("notQRV10G")));
+		builtChatMember.setQrv50(!helper_IntToBooleanConverter(resultSet.getInt("notQRV50")));
+		builtChatMember.setQrv70(!helper_IntToBooleanConverter(resultSet.getInt("notQRV70")));
 		builtChatMember.setLastFlagsChangeEpochMs(resultSet.getLong("lastFlagsChangeEpochMs"));
 
 		return builtChatMember;
@@ -922,6 +971,8 @@ public class DBController {
 		targetChatMember.setWorked3400(sourceChatMember.isWorked3400());
 		targetChatMember.setWorked5600(sourceChatMember.isWorked5600());
 		targetChatMember.setWorked10G(sourceChatMember.isWorked10G());
+		targetChatMember.setWorked50(sourceChatMember.isWorked50());
+		targetChatMember.setWorked70(sourceChatMember.isWorked70());
 		targetChatMember.setQrv144(sourceChatMember.isQrv144());
 		targetChatMember.setQrv432(sourceChatMember.isQrv432());
 		targetChatMember.setQrv1240(sourceChatMember.isQrv1240());
@@ -929,6 +980,8 @@ public class DBController {
 		targetChatMember.setQrv3400(sourceChatMember.isQrv3400());
 		targetChatMember.setQrv5600(sourceChatMember.isQrv5600());
 		targetChatMember.setQrv10G(sourceChatMember.isQrv10G());
+		targetChatMember.setQrv50(sourceChatMember.isQrv50());
+		targetChatMember.setQrv70(sourceChatMember.isQrv70());
 		targetChatMember.setLastFlagsChangeEpochMs(sourceChatMember.getLastFlagsChangeEpochMs());
 	}
 
@@ -954,6 +1007,10 @@ public class DBController {
 			return "worked5600";
 		} else if (chatMemberToStore.isWorked10G()) {
 			return "worked10G";
+		} else if (chatMemberToStore.isWorked50()) {
+			return "worked50";
+		} else if (chatMemberToStore.isWorked70()) {
+			return "worked70";
 		}
 
 		return null;
@@ -996,13 +1053,17 @@ public class DBController {
 				|| chatMemberToStore.isWorked3400()
 				|| chatMemberToStore.isWorked5600()
 				|| chatMemberToStore.isWorked10G()
+				|| chatMemberToStore.isWorked50()
+				|| chatMemberToStore.isWorked70()
 				|| !chatMemberToStore.isQrv144()
 				|| !chatMemberToStore.isQrv432()
 				|| !chatMemberToStore.isQrv1240()
 				|| !chatMemberToStore.isQrv2300()
 				|| !chatMemberToStore.isQrv3400()
 				|| !chatMemberToStore.isQrv5600()
-				|| !chatMemberToStore.isQrv10G();
+				|| !chatMemberToStore.isQrv10G()
+				|| !chatMemberToStore.isQrv50()
+				|| !chatMemberToStore.isQrv70();
 	}
 
 	/**

src/main/java/kst4contest/controller/ReachabilityService.java

@@ -284,6 +284,17 @@ public final class ReachabilityService {
             return Band.B_1296;
         }
 
+        if (member != null
+                && member.getChatCategory() != null
+                && member.getChatCategory().getCategoryNumber() == ChatCategory.FIFTYSEVENTYMHz) {
+            if (fallbackBands.contains(Band.B_50)) {
+                return Band.B_50;
+            }
+            if (fallbackBands.contains(Band.B_70)) {
+                return Band.B_70;
+            }
+        }
+
         if (fallbackBands.contains(Band.B_144)) {
             return Band.B_144;
         }

src/main/java/kst4contest/controller/ReadUDPbyUCXMessageThread.java

@@ -144,6 +144,12 @@ public class ReadUDPbyUCXMessageThread extends Thread {
 		}
 
 		switch (band.trim()) {
+			case "50":
+			case "6m":
+				return Band.B_50;
+			case "70":
+			case "4m":
+				return Band.B_70;
 			case "144":
 			case "2m":
 				return Band.B_144;
@@ -357,6 +363,20 @@ public class ReadUDPbyUCXMessageThread extends Thread {
 						Band workedBand = helper_resolveBandFromLoggerBand(band);
 
 						switch (band) {
+						case "50":
+						case "6m":
+						{
+							workedCall.setWorked50(true);
+							break;
+						}
+
+						case "70":
+						case "4m":
+						{
+							workedCall.setWorked70(true);
+							break;
+						}
+
 						case "144":
 						case "2m": //minos contest logger
 						{
@@ -434,7 +454,13 @@ public class ReadUDPbyUCXMessageThread extends Thread {
 
 									modifyThat.setWorked(true);
 
-									if (workedCall.isWorked144()) {
+									if (workedCall.isWorked50()) {
+										modifyThat.setWorked50(true);
+
+									} else if (workedCall.isWorked70()) {
+										modifyThat.setWorked70(true);
+
+									} else if (workedCall.isWorked144()) {
 										modifyThat.setWorked144(true);
 
 									} else if (workedCall.isWorked432()) {

src/main/java/kst4contest/controller/WinTestSkedSender.java

@@ -155,6 +155,8 @@ public class WinTestSkedSender {
     public static int toWinTestBandId(Band band) {
         if (band == null) return 12; // default to 144 MHz
         return switch (band) {
+            case B_50   -> 10;
+            case B_70   -> 11;
             case B_144  -> 12;
             case B_432  -> 14;
             case B_1296 -> 16;

src/main/java/kst4contest/controller/WorkedGrossFieldCache.java

@@ -98,6 +98,8 @@ public final class WorkedGrossFieldCache {
             if (member.isWorked3400()) addWorked(Band.B_3400, locator);
             if (member.isWorked5600()) addWorked(Band.B_5760, locator);
             if (member.isWorked10G()) addWorked(Band.B_10G, locator);
+            if (member.isWorked50()) addWorked(Band.B_50, locator);
+            if (member.isWorked70()) addWorked(Band.B_70, locator);
         }
     }
 

src/main/java/kst4contest/logic/BandOpportunityResolver.java

@@ -87,6 +87,8 @@ public final class BandOpportunityResolver {
             return enabledBands;
         }
 
+        if (preferences.isStn_bandActive50()) enabledBands.add(Band.B_50);
+        if (preferences.isStn_bandActive70()) enabledBands.add(Band.B_70);
         if (preferences.isStn_bandActive144()) enabledBands.add(Band.B_144);
         if (preferences.isStn_bandActive432()) enabledBands.add(Band.B_432);
         if (preferences.isStn_bandActive1240()) enabledBands.add(Band.B_1296);
@@ -149,6 +151,8 @@ public final class BandOpportunityResolver {
     }
 
     private static void collectWorkedBands(ChatMember member, EnumSet<Band> target) {
+        if (member.isWorked50()) target.add(Band.B_50);
+        if (member.isWorked70()) target.add(Band.B_70);
         if (member.isWorked144()) target.add(Band.B_144);
         if (member.isWorked432()) target.add(Band.B_432);
         if (member.isWorked1240()) target.add(Band.B_1296);
@@ -160,6 +164,8 @@ public final class BandOpportunityResolver {
     }
 
     private static void collectNotQrvBands(ChatMember member, EnumSet<Band> target) {
+        if (!member.isQrv50()) target.add(Band.B_50);
+        if (!member.isQrv70()) target.add(Band.B_70);
         if (!member.isQrv144()) target.add(Band.B_144);
         if (!member.isQrv432()) target.add(Band.B_432);
         if (!member.isQrv1240()) target.add(Band.B_1296);
@@ -173,6 +179,11 @@ public final class BandOpportunityResolver {
     private static Map<Band, Pattern> createStationNameBandPatterns() {
         Map<Band, Pattern> patterns = new EnumMap<>(Band.class);
 
+        // Bare "70" and bare "6" are already claimed by the 70cm/6cm shorthand below
+        // (their "CM" suffix is optional), so 4m/6m must require an explicit MHz/"M"
+        // suffix here to avoid misreading a cm-band shorthand as 70/50 MHz.
+        patterns.put(Band.B_50, bandPattern("50(?:\\s*MHZ)?|6\\s*M"));
+        patterns.put(Band.B_70, bandPattern("70\\s*MHZ|4\\s*M"));
         patterns.put(Band.B_144, bandPattern("144(?:\\s*MHZ)?|2(?:\\s*M)?"));
         patterns.put(Band.B_432, bandPattern("432(?:\\s*MHZ)?|70(?:\\s*CM)?"));
         patterns.put(Band.B_1296, bandPattern("1296(?:\\s*MHZ)?|23(?:\\s*CM)?"));

src/main/java/kst4contest/model/Band.java

@@ -5,6 +5,8 @@ package kst4contest.model;
  * Used for plausibility checks in the Smart Parser.
  */
 public enum Band {
+    B_50(50.000, 54.000, "50"),
+    B_70(70.000, 70.500, "70"),
     B_144(144.000, 146.000, "144"),
     B_432(432.000, 434.000, "432"),
     B_1296(1296.000, 1298.000, "1296"),
@@ -75,6 +77,8 @@ public enum Band {
      */
     public String getDisplayLabel() {
         switch (this) {
+            case B_50: return "50";
+            case B_70: return "70";
             case B_144: return "144";
             case B_432: return "432";
             case B_1296: return "1296";

src/main/java/kst4contest/model/ChatMember.java

@@ -72,6 +72,8 @@ public class ChatMember {
 	/**
 	 * Chatmember is qrv at all band except we initialize anything other, depending to user entry
 	 */
+	boolean qrv50 = true;
+	boolean qrv70 = true;
 	boolean qrv144 = true;
 	boolean qrv432 = true;
 	boolean qrv1240 = true;
@@ -228,6 +230,22 @@ public class ChatMember {
 		worked10G = worked10g;
 	}
 
+	public boolean isQrv50() {
+		return qrv50;
+	}
+
+	public void setQrv50(boolean qrv50) {
+		this.qrv50 = qrv50;
+	}
+
+	public boolean isQrv70() {
+		return qrv70;
+	}
+
+	public void setQrv70(boolean qrv70) {
+		this.qrv70 = qrv70;
+	}
+
 	public boolean isQrv144() {
 		return qrv144;
 	}
@@ -607,6 +625,8 @@ public class ChatMember {
 	public void resetQRVInformationAtAllBands() {
 
 		this.setQrvAny(true);
+		this.setQrv50(true);
+		this.setQrv70(true);
 		this.setQrv144(true);
 		this.setQrv432(true);
 		this.setQrv1240(true);

src/main/java/kst4contest/model/ChatPreferences.java

@@ -197,6 +197,8 @@ public class ChatPreferences {
 	boolean loginToSecondChatEnabled;
 	DoubleProperty actualQTF = new SimpleDoubleProperty(360); // will be updated by user at runtime!
 
+	boolean stn_bandActive50;
+	boolean stn_bandActive70;
 	boolean stn_bandActive144;
 	boolean stn_bandActive432;
 	boolean stn_bandActive1240;
@@ -1504,6 +1506,14 @@ public class ChatPreferences {
 
 
 
+			Element stn_bandActive50 = doc.createElement("stn_bandActive50");
+			stn_bandActive50.setTextContent(this.stn_bandActive50+"");
+			station.appendChild(stn_bandActive50);
+
+			Element stn_bandActive70 = doc.createElement("stn_bandActive70");
+			stn_bandActive70.setTextContent(this.stn_bandActive70+"");
+			station.appendChild(stn_bandActive70);
+
 			Element stn_bandActive144 = doc.createElement("stn_bandActive144");
 			stn_bandActive144.setTextContent(this.stn_bandActive144+"");
 			station.appendChild(stn_bandActive144);
@@ -2239,6 +2249,8 @@ public class ChatPreferences {
 				);
 
 				// Band activity flags (introduced later; if missing -> keep defaults)
+				stn_bandActive50 = getBoolean(stationEl, stn_bandActive50, "stn_bandActive50");
+				stn_bandActive70 = getBoolean(stationEl, stn_bandActive70, "stn_bandActive70");
 				stn_bandActive144 = getBoolean(stationEl, stn_bandActive144, "stn_bandActive144");
 				stn_bandActive432 = getBoolean(stationEl, stn_bandActive432, "stn_bandActive432");
 				stn_bandActive1240 = getBoolean(stationEl, stn_bandActive1240, "stn_bandActive1240");
@@ -2896,6 +2908,22 @@ public class ChatPreferences {
 		return result;
 	}
 
+	public boolean isStn_bandActive50() {
+		return stn_bandActive50;
+	}
+
+	public void setStn_bandActive50(boolean stn_bandActive50) {
+		this.stn_bandActive50 = stn_bandActive50;
+	}
+
+	public boolean isStn_bandActive70() {
+		return stn_bandActive70;
+	}
+
+	public void setStn_bandActive70(boolean stn_bandActive70) {
+		this.stn_bandActive70 = stn_bandActive70;
+	}
+
 	public boolean isStn_bandActive144() {
 		return stn_bandActive144;
 	}

src/main/java/kst4contest/view/Kst4ContestApplication.java

@@ -570,6 +570,8 @@ public class Kst4ContestApplication extends Application implements StatusUpdateL
 	private String bandToHumanLabel(kst4contest.model.Band b) {
 		// Human-friendly labels for VHF/UHF/microwave contesting
 		return switch (b) {
+			case B_50 -> "6m";
+			case B_70 -> "4m";
 			case B_144 -> "2m";
 			case B_432 -> "70cm";
 			case B_1296 -> "23cm";
@@ -772,6 +774,50 @@ public class Kst4ContestApplication extends Application implements StatusUpdateL
 
         // * users qrv info setting will follow here
 
+		CheckBox furtherInfoPnl_chkbx_notQRV50 = new CheckBox("tag not qrv 50");
+		furtherInfoPnl_chkbx_notQRV50.setSelected(!selectedCallSignInfoStageChatMember.isQrv50());
+		furtherInfoPnl_chkbx_notQRV50.selectedProperty().addListener(new ChangeListener<Boolean>() {
+			@Override
+			public void changed(ObservableValue<? extends Boolean> observable, Boolean oldValue, Boolean newValue) {
+				if (!newValue) {
+					selectedCallSignInfoStageChatMember.setQrv50(true);
+				} else {
+					selectedCallSignInfoStageChatMember.setQrv50(false);
+				}
+
+				try {
+
+					chatcontroller.propagateNotQrvStateToActiveMembers(selectedCallSignInfoStageChatMember);
+					chatcontroller.getDbHandler().updateNotQRVInfoOnChatMember(selectedCallSignInfoStageChatMember);
+					GuiUtils.triggerGUIFilteredChatMemberListChange(chatcontroller);
+				} catch (Exception e) {
+					//do nothing, upodate was not possible
+				}
+			}
+		});
+
+		CheckBox furtherInfoPnl_chkbx_notQRV70 = new CheckBox("tag not qrv 70");
+		furtherInfoPnl_chkbx_notQRV70.setSelected(!selectedCallSignInfoStageChatMember.isQrv70());
+		furtherInfoPnl_chkbx_notQRV70.selectedProperty().addListener(new ChangeListener<Boolean>() {
+			@Override
+			public void changed(ObservableValue<? extends Boolean> observable, Boolean oldValue, Boolean newValue) {
+				if (!newValue) {
+					selectedCallSignInfoStageChatMember.setQrv70(true);
+				} else {
+					selectedCallSignInfoStageChatMember.setQrv70(false);
+				}
+
+				try {
+
+					chatcontroller.propagateNotQrvStateToActiveMembers(selectedCallSignInfoStageChatMember);
+					chatcontroller.getDbHandler().updateNotQRVInfoOnChatMember(selectedCallSignInfoStageChatMember);
+					GuiUtils.triggerGUIFilteredChatMemberListChange(chatcontroller);
+				} catch (Exception e) {
+					//do nothing, upodate was not possible
+				}
+			}
+		});
+
 		CheckBox furtherInfoPnl_chkbx_notQRV144 = new CheckBox("tag not qrv 144");
 		furtherInfoPnl_chkbx_notQRV144.setSelected(!selectedCallSignInfoStageChatMember.isQrv144());
 		furtherInfoPnl_chkbx_notQRV144.selectedProperty().addListener(new ChangeListener<Boolean>() {
@@ -933,6 +979,8 @@ public class Kst4ContestApplication extends Application implements StatusUpdateL
 			@Override
 			public void changed(ObservableValue<? extends Boolean> observable, Boolean oldValue, Boolean newValue) {
 				if (!newValue) {
+					selectedCallSignInfoStageChatMember.setQrv50(true);
+					selectedCallSignInfoStageChatMember.setQrv70(true);
 					selectedCallSignInfoStageChatMember.setQrv144(true);
 					selectedCallSignInfoStageChatMember.setQrv432(true);
 					selectedCallSignInfoStageChatMember.setQrv1240(true);
@@ -941,6 +989,8 @@ public class Kst4ContestApplication extends Application implements StatusUpdateL
 					selectedCallSignInfoStageChatMember.setQrv5600(true);
 					selectedCallSignInfoStageChatMember.setQrv10G(true);
 				} else {
+					selectedCallSignInfoStageChatMember.setQrv50(false);
+					selectedCallSignInfoStageChatMember.setQrv70(false);
 					selectedCallSignInfoStageChatMember.setQrv144(false);
 					selectedCallSignInfoStageChatMember.setQrv432(false);
 					selectedCallSignInfoStageChatMember.setQrv1240(false);
@@ -970,6 +1020,12 @@ public class Kst4ContestApplication extends Application implements StatusUpdateL
 		selectedCallSignDownerSiteGridPane.add(furtherInfoPnl_chkbx_notQRV3, 3,2,1,1);
 		selectedCallSignDownerSiteGridPane.add(furtherInfoPnl_chkbx_notQRVall, 3,3,1,1);
 
+		if (!chatcontroller.getChatPreferences().isStn_bandActive50()) {
+			furtherInfoPnl_chkbx_notQRV50.setVisible(false);
+		}
+		if (!chatcontroller.getChatPreferences().isStn_bandActive70()) {
+			furtherInfoPnl_chkbx_notQRV70.setVisible(false);
+		}
 		if (!chatcontroller.getChatPreferences().isStn_bandActive144()) {
 			furtherInfoPnl_chkbx_notQRV144.setVisible(false);
 		}
@@ -1079,6 +1135,8 @@ public class Kst4ContestApplication extends Application implements StatusUpdateL
 				selectedCallSignTurnAntBtn,
 				selectedCallSignShowQRZprofile,
 				selectedCallSignShowQRZCqprofile,
+				furtherInfoPnl_chkbx_notQRV50,
+				furtherInfoPnl_chkbx_notQRV70,
 				furtherInfoPnl_chkbx_notQRV144,
 				furtherInfoPnl_chkbx_notQRV432,
 				furtherInfoPnl_chkbx_notQRV23,
@@ -1794,6 +1852,34 @@ public class Kst4ContestApplication extends Application implements StatusUpdateL
 		});
 
 
+		TableColumn<ChatMember, String> sixMCol_subcol = new TableColumn<ChatMember, String>("50");
+		sixMCol_subcol
+				.setCellValueFactory(new Callback<CellDataFeatures<ChatMember, String>, ObservableValue<String>>() {
+
+					@Override
+					public ObservableValue<String> call(CellDataFeatures<ChatMember, String> cellDataFeatures) {
+						return new SimpleStringProperty(formatBandCellStatus(
+								cellDataFeatures.getValue(), Band.B_50, cellDataFeatures.getValue().isWorked50()
+						));
+					}
+				});
+		sixMCol_subcol.prefWidthProperty().bind(tbl_chatMemberTable.widthProperty().divide(28));
+		sixMCol_subcol.setCellFactory(createBandStatusCellFactory(Band.B_50));
+
+		TableColumn<ChatMember, String> fourMCol_subcol = new TableColumn<ChatMember, String>("70");
+		fourMCol_subcol
+				.setCellValueFactory(new Callback<CellDataFeatures<ChatMember, String>, ObservableValue<String>>() {
+
+					@Override
+					public ObservableValue<String> call(CellDataFeatures<ChatMember, String> cellDataFeatures) {
+						return new SimpleStringProperty(formatBandCellStatus(
+								cellDataFeatures.getValue(), Band.B_70, cellDataFeatures.getValue().isWorked70()
+						));
+					}
+				});
+		fourMCol_subcol.prefWidthProperty().bind(tbl_chatMemberTable.widthProperty().divide(28));
+		fourMCol_subcol.setCellFactory(createBandStatusCellFactory(Band.B_70));
+
 		TableColumn<ChatMember, String> vhfCol_subcol = new TableColumn<ChatMember, String>("144");
 		vhfCol_subcol
 				.setCellValueFactory(new Callback<CellDataFeatures<ChatMember, String>, ObservableValue<String>>() {
@@ -1902,6 +1988,18 @@ public class Kst4ContestApplication extends Application implements StatusUpdateL
 
 				wkd.setValue("");
 
+				if (!cellDataFeatures.getValue().isQrv50()) {
+					wkd.setValue(wkd.getValue() + "6m ");
+				} else {
+					wkd.setValue(wkd.getValue().replace("6m ",""));
+				}
+
+				if (!cellDataFeatures.getValue().isQrv70()) {
+					wkd.setValue(wkd.getValue() + "4m ");
+				} else {
+					wkd.setValue(wkd.getValue().replace("4m ",""));
+				}
+
 				if (!cellDataFeatures.getValue().isQrv144()) {
 					wkd.setValue(wkd.getValue() + "144 ");
 				} else {
@@ -1974,6 +2072,12 @@ public class Kst4ContestApplication extends Application implements StatusUpdateL
 		 * add now only cols which affects the used band of my station
 		 */
 
+		if (chatcontroller.getChatPreferences().isStn_bandActive50()) {
+			workedCol.getColumns().add(sixMCol_subcol);
+		}
+		if (chatcontroller.getChatPreferences().isStn_bandActive70()) {
+			workedCol.getColumns().add(fourMCol_subcol);
+		}
 		if (chatcontroller.getChatPreferences().isStn_bandActive144()) {
 			workedCol.getColumns().add(vhfCol_subcol);
 		}
@@ -2832,6 +2936,8 @@ public class Kst4ContestApplication extends Application implements StatusUpdateL
 			Button selectedCallSignTurnAntBtn,
 			Button selectedCallSignShowQRZprofile,
 			Button selectedCallSignShowQRZCqprofile,
+			CheckBox furtherInfoPnl_chkbx_notQRV50,
+			CheckBox furtherInfoPnl_chkbx_notQRV70,
 			CheckBox furtherInfoPnl_chkbx_notQRV144,
 			CheckBox furtherInfoPnl_chkbx_notQRV432,
 			CheckBox furtherInfoPnl_chkbx_notQRV23,
@@ -2843,6 +2949,8 @@ public class Kst4ContestApplication extends Application implements StatusUpdateL
 	) {
 
 		for (CheckBox cb : Arrays.asList(
+				furtherInfoPnl_chkbx_notQRV50,
+				furtherInfoPnl_chkbx_notQRV70,
 				furtherInfoPnl_chkbx_notQRV144,
 				furtherInfoPnl_chkbx_notQRV432,
 				furtherInfoPnl_chkbx_notQRV23,
@@ -2902,6 +3010,8 @@ public class Kst4ContestApplication extends Application implements StatusUpdateL
 		notQrvFlow.setStyle("-fx-padding: 3; -fx-border-color: lightgrey; -fx-border-width: 1;");
 		notQrvFlow.getChildren().addAll(
 				new Label("Not QRV:"),
+				furtherInfoPnl_chkbx_notQRV50,
+				furtherInfoPnl_chkbx_notQRV70,
 				furtherInfoPnl_chkbx_notQRV144,
 				furtherInfoPnl_chkbx_notQRV432,
 				furtherInfoPnl_chkbx_notQRV23,
@@ -4763,6 +4873,44 @@ public class Kst4ContestApplication extends Application implements StatusUpdateL
 				});
 		wkdAny_subcol.prefWidthProperty().bind(tbl_chatMemberWkdDBTable.widthProperty().divide(28));
 
+		TableColumn<ChatMember, String> sixMCol_subcol = new TableColumn<ChatMember, String>("50");
+		sixMCol_subcol
+				.setCellValueFactory(new Callback<CellDataFeatures<ChatMember, String>, ObservableValue<String>>() {
+
+					@Override
+					public ObservableValue<String> call(CellDataFeatures<ChatMember, String> cellDataFeatures) {
+						SimpleStringProperty wkd = new SimpleStringProperty();
+
+						if (cellDataFeatures.getValue().isWorked50()) {
+							wkd.setValue("X");
+						} else {
+							wkd.setValue("");
+						}
+
+						return wkd;
+					}
+				});
+		sixMCol_subcol.prefWidthProperty().bind(tbl_chatMemberWkdDBTable.widthProperty().divide(28));
+
+		TableColumn<ChatMember, String> fourMCol_subcol = new TableColumn<ChatMember, String>("70");
+		fourMCol_subcol
+				.setCellValueFactory(new Callback<CellDataFeatures<ChatMember, String>, ObservableValue<String>>() {
+
+					@Override
+					public ObservableValue<String> call(CellDataFeatures<ChatMember, String> cellDataFeatures) {
+						SimpleStringProperty wkd = new SimpleStringProperty();
+
+						if (cellDataFeatures.getValue().isWorked70()) {
+							wkd.setValue("X");
+						} else {
+							wkd.setValue("");
+						}
+
+						return wkd;
+					}
+				});
+		fourMCol_subcol.prefWidthProperty().bind(tbl_chatMemberWkdDBTable.widthProperty().divide(28));
+
 		TableColumn<ChatMember, String> vhfCol_subcol = new TableColumn<ChatMember, String>("144");
 		vhfCol_subcol
 				.setCellValueFactory(new Callback<CellDataFeatures<ChatMember, String>, ObservableValue<String>>() {
@@ -4893,7 +5041,7 @@ public class Kst4ContestApplication extends Application implements StatusUpdateL
 
 		shf3_subcol.prefWidthProperty().bind(tbl_chatMemberWkdDBTable.widthProperty().divide(32));
 
-		workedCol.getColumns().addAll(wkdAny_subcol, vhfCol_subcol, uhfCol_subcol, shf23_subcol, shf13_subcol,
+		workedCol.getColumns().addAll(wkdAny_subcol, sixMCol_subcol, fourMCol_subcol, vhfCol_subcol, uhfCol_subcol, shf23_subcol, shf13_subcol,
 				shf9_subcol, shf6_subcol, shf3_subcol); // TODO: automatize enabling to users bandChoice
 
 		tbl_chatMemberWkdDBTable.getColumns().addAll(callSignCol, workedCol);
@@ -7705,6 +7853,54 @@ public class Kst4ContestApplication extends Application implements StatusUpdateL
 				}
 			});
 
+			ToggleButton btnTglwkd50 = new ToggleButton("50");
+
+			Predicate<ChatMember> wkd50Predicate = new Predicate<ChatMember>() {
+				@Override
+				public boolean test(ChatMember chatMember) {
+
+					if (chatMember.isWorked50() || !chatMember.isQrv50()) {
+						return false;
+					}
+					else return true;
+				}
+			};
+			btnTglwkd50.setOnAction(new EventHandler<ActionEvent>() {
+
+				@Override
+				public void handle(ActionEvent actionEvent) {
+					if (btnTglwkd50.isSelected()) {
+						chatcontroller.getLst_chatMemberListFilterPredicates().add(wkd50Predicate);
+					} else {
+						chatcontroller.getLst_chatMemberListFilterPredicates().remove(wkd50Predicate);
+					}
+				}
+			});
+
+			ToggleButton btnTglwkd70 = new ToggleButton("70");
+
+			Predicate<ChatMember> wkd70Predicate = new Predicate<ChatMember>() {
+				@Override
+				public boolean test(ChatMember chatMember) {
+
+					if (chatMember.isWorked70() || !chatMember.isQrv70()) {
+						return false;
+					}
+					else return true;
+				}
+			};
+			btnTglwkd70.setOnAction(new EventHandler<ActionEvent>() {
+
+				@Override
+				public void handle(ActionEvent actionEvent) {
+					if (btnTglwkd70.isSelected()) {
+						chatcontroller.getLst_chatMemberListFilterPredicates().add(wkd70Predicate);
+					} else {
+						chatcontroller.getLst_chatMemberListFilterPredicates().remove(wkd70Predicate);
+					}
+				}
+			});
+
 			ToggleButton btnTglwkd144 = new ToggleButton("144");
 
 			Predicate<ChatMember> wkd144Predicate = new Predicate<ChatMember>() {
@@ -7911,6 +8107,12 @@ public class Kst4ContestApplication extends Application implements StatusUpdateL
 			/**
 			 * add only filter buttons at the callsigntable which affects used bands
 			 */
+			if (chatcontroller.getChatPreferences().isStn_bandActive50()) {
+				chatMemberTableFilterWorkedBandFiltersHbx.getChildren().add(btnTglwkd50);
+			}
+			if (chatcontroller.getChatPreferences().isStn_bandActive70()) {
+				chatMemberTableFilterWorkedBandFiltersHbx.getChildren().add(btnTglwkd70);
+			}
 			if (chatcontroller.getChatPreferences().isStn_bandActive144()) {
 				chatMemberTableFilterWorkedBandFiltersHbx.getChildren().add(btnTglwkd144);
 			}
@@ -8963,6 +9165,34 @@ public class Kst4ContestApplication extends Application implements StatusUpdateL
 //				"! ! ! ! Don´t forget to reset the worked stations information before starting a new contest ! ! ! !"));
 
 
+		CheckBox settings_chkbx_QRV50 = new CheckBox("My station uses 6m band");
+		settings_chkbx_QRV50.setSelected(chatcontroller.getChatPreferences().isStn_bandActive50());
+		settings_chkbx_QRV50.selectedProperty().addListener(new ChangeListener<Boolean>() {
+			@Override
+			public void changed(ObservableValue<? extends Boolean> observable, Boolean oldValue, Boolean newValue) {
+				chatcontroller.getChatPreferences().setStn_bandActive50(
+						settings_chkbx_QRV50.isSelected());
+				System.out.println("[Main.java, Info]: setted my 50 qrv setting to: "
+						+ chatcontroller.getChatPreferences().isStn_bandActive50());
+				chatMemberTableFilterQTFAndQRBHbox.setVisible(false);
+				chatMemberTableFilterQTFAndQRBHbox.setVisible(true);
+			}
+		});
+
+		CheckBox settings_chkbx_QRV70 = new CheckBox("My station uses 4m band");
+		settings_chkbx_QRV70.setSelected(chatcontroller.getChatPreferences().isStn_bandActive70());
+		settings_chkbx_QRV70.selectedProperty().addListener(new ChangeListener<Boolean>() {
+			@Override
+			public void changed(ObservableValue<? extends Boolean> observable, Boolean oldValue, Boolean newValue) {
+				chatcontroller.getChatPreferences().setStn_bandActive70(
+						settings_chkbx_QRV70.isSelected());
+				System.out.println("[Main.java, Info]: setted my 70 qrv setting to: "
+						+ chatcontroller.getChatPreferences().isStn_bandActive70());
+				chatMemberTableFilterQTFAndQRBHbox.setVisible(false);
+				chatMemberTableFilterQTFAndQRBHbox.setVisible(true);
+			}
+		});
+
 		CheckBox settings_chkbx_QRV144 = new CheckBox("My station uses 2m band");
 		settings_chkbx_QRV144.setSelected(chatcontroller.getChatPreferences().isStn_bandActive144());
 		settings_chkbx_QRV144.selectedProperty().addListener(new ChangeListener<Boolean>() {
@@ -9063,6 +9293,8 @@ public class Kst4ContestApplication extends Application implements StatusUpdateL
 		grdPnlStation_bands.add(settings_chkbx_QRV3400, 1, 2);
 		grdPnlStation_bands.add(settings_chkbx_QRV5600, 2, 2);
 		grdPnlStation_bands.add(settings_chkbx_QRV10G, 0, 3);
+		grdPnlStation_bands.add(settings_chkbx_QRV50, 1, 3);
+		grdPnlStation_bands.add(settings_chkbx_QRV70, 2, 3);
 
 		grdPnlStation_bands.setStyle("   -fx-border-color: lightgray;\n" +
 				"    -fx-vgap: 5;\n" +

src/main/java/kst4contest/view/map/MapCallsignRawSnapshotBuilder.java

@@ -275,6 +275,8 @@ public final class MapCallsignRawSnapshotBuilder {
 
     private String toBandDisplayLabel(Band band) {
         return switch (band) {
+            case B_50 -> "50";
+            case B_70 -> "70";
             case B_144 -> "144";
             case B_432 -> "432";
             case B_1296 -> "1296";

src/test/java/kst4contest/test/BandOpportunityResolverTest.java

@@ -80,6 +80,29 @@ class BandOpportunityResolverTest {
         assertTrue(resolution.getAvailableBands().contains(Band.B_144));
     }
 
+    @Test
+    void detectsFourAndSixMetersWithoutStealingCmShorthandBands() {
+        EnumSet<Band> bands = BandOpportunityResolver.detectBandsFromStationName(
+                "QRV 50 70cm 6M 4M"
+        );
+
+        assertEquals(
+                EnumSet.of(Band.B_50, Band.B_432, Band.B_70),
+                bands
+        );
+    }
+
+    @Test
+    void bareSeventyAndBareSixStillMeanCentimeterBands() {
+        EnumSet<Band> bands = BandOpportunityResolver.detectBandsFromStationName(
+                "QRV 70 6"
+        );
+
+        assertEquals(EnumSet.of(Band.B_432, Band.B_5760), bands);
+        assertFalse(bands.contains(Band.B_70));
+        assertFalse(bands.contains(Band.B_50));
+    }
+
     @Test
     void opportunityRequiresAvailableEnabledAndUnworkedBand() {
         ChatMember station = new ChatMember();