diff --git a/application/controllers/Logbook.php b/application/controllers/Logbook.php
index 78233465..cbe6aa11 100755
--- a/application/controllers/Logbook.php
+++ b/application/controllers/Logbook.php
@@ -698,7 +698,38 @@ class Logbook extends CI_Controller {
 		}
 	}
 
+	function search_duplicates($station_id) {
+		$station_id = $this->security->xss_clean($station_id);
 
+		$this->load->model('user_model');
+
+		if(!$this->user_model->authorize($this->config->item('auth_mode'))) { return; }
+		
+		$CI =& get_instance();
+		$CI->load->model('logbooks_model');
+		$logbooks_locations_array = $CI->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
+		
+		if (!$logbooks_locations_array) {
+			return null;
+		}
+
+		$location_list = "'".implode("','",$logbooks_locations_array)."'";
+		
+		$sql = 'select count(*) as occurence, COL_CALL, COL_MODE, COL_SUBMODE, station_callsign, COL_SAT_NAME, COL_BAND,  min(col_time_on) Mintime, max(col_time_on) Maxtime from ' . $this->config->item('table_name') . 
+		' join station_profile on ' . $this->config->item('table_name') . '.station_id = station_profile.station_id where ' . $this->config->item('table_name') .'.station_id in ('. $location_list . ')'; 
+		
+		if ($station_id != 'All') {
+			$sql .= ' and station_profile.station_id = ' . $station_id;
+		}
+		
+		$sql .= ' group by col_call, col_mode, COL_SUBMODE, STATION_CALLSIGN, col_band, COL_SAT_NAME having count(*) > 1 and timediff(maxtime, mintime) < 3000';
+
+		$query = $this->db->query($sql);
+
+		$data['qsos'] = $query;
+
+		$this->load->view('search/duplicates_result.php', $data);
+	}
 
 	/*
 	 * Provide a dxcc search, returning results json encoded
diff --git a/application/controllers/Search.php b/application/controllers/Search.php
index b6e8dd65..024abba8 100644
--- a/application/controllers/Search.php
+++ b/application/controllers/Search.php
@@ -56,6 +56,18 @@ class Search extends CI_Controller {
         }
     }
 
+	// Searches for duplicate QSOs within 30m of time difference
+    public function duplicates() {
+		$this->load->model('stations');
+
+		$data['station_profile'] = $this->stations->all_of_user();
+        $data['page_title'] = "Duplicate QSOs within 30m time difference";
+
+		$this->load->view('interface_assets/header', $data);
+		$this->load->view('search/duplicates');
+		$this->load->view('interface_assets/footer');
+    }
+
     function json_result() {
           if(isset($_POST['search'])) {
 			  $result = $this->fetchQueryResult($_POST['search'], false);
diff --git a/application/views/interface_assets/footer.php b/application/views/interface_assets/footer.php
index b8d0e3b5..baed13ac 100644
--- a/application/views/interface_assets/footer.php
+++ b/application/views/interface_assets/footer.php
@@ -897,6 +897,29 @@ function getLookupResult() {
 <script type="text/javascript">
 i=0;
 
+function findduplicates(){
+    event.preventDefault();
+    $('#partial_view').load(base_url+"index.php/logbook/search_duplicates/"+$("#station_id").val(), function() {
+        $('.qsolist').DataTable({
+            "pageLength": 25,
+            responsive: false,
+            ordering: false,
+            "scrollY":        "500px",
+            "scrollCollapse": true,
+            "paging":         false,
+            "scrollX": true,
+            dom: 'Bfrtip',
+            buttons: [
+                'csv'
+            ]
+        });
+        // change color of csv-button if dark mode is chosen
+        if (isDarkModeTheme()) {
+            $(".buttons-csv").css("color", "white");
+        }
+    });
+}
+
 function searchButtonPress(){
     event.preventDefault()
     if ($('#callsign').val()) {
diff --git a/application/views/search/duplicates.php b/application/views/search/duplicates.php
new file mode 100644
index 00000000..5176def2
--- /dev/null
+++ b/application/views/search/duplicates.php
@@ -0,0 +1,43 @@
+<div class="container search">
+
+	<h1>
+		Search
+		<small class="text-muted">Ready to find a QSO?</small>
+	</h1>
+
+	<div class="card text-center">
+	  <div class="card-header">
+	    <ul class="nav nav-tabs card-header-tabs">
+	      <li class="nav-item">
+	        <a class="nav-link" href="<?php echo site_url('search'); ?>">Search</a>
+	      </li>
+	      <li class="nav-item">
+	        <a class="nav-link" href="<?php echo site_url('search/filter'); ?>">Advanced Search</a>
+	      </li>
+		  <li class="nav-item">
+	        <a class="nav-link active" href="<?php echo site_url('search/duplicates'); ?>">Duplicate QSOs</a>
+	      </li>
+	    </ul>
+	  </div>
+	  <div class="card-body">
+	  	<form method="post" action="" id="search_box" name="test">
+		  <div class="form-group row">
+		    <label for="callsign" class="col-sm-2 col-form-label">Station location:</label>
+		    <select id="station_id" name="station_profile" class="custom-select col-sm-3 mb-3 mr-sm-3">
+					<option value="All">All</option>
+                    <?php foreach ($station_profile->result() as $station) { ?>
+                    <option value="<?php echo $station->station_id; ?>">Callsign: <?php echo $station->station_callsign; ?> (<?php echo $station->station_profile_name; ?>)</option>
+                    <?php } ?>
+                    </select>
+		    <div class="col-sm-2">
+		    	<button onclick="findduplicates();" class="btn btn-outline-success my-2 my-sm-0" type="submit"><i class="fas fa-search"></i> Search</button>
+		    </div>
+		  </div>
+		</form>
+
+		<div id="partial_view"></div>
+
+	  </div>
+	</div>
+
+</div>
diff --git a/application/views/search/duplicates_result.php b/application/views/search/duplicates_result.php
new file mode 100644
index 00000000..42dcf3c5
--- /dev/null
+++ b/application/views/search/duplicates_result.php
@@ -0,0 +1,49 @@
+<?php
+if ($qsos->result() != NULL) {
+	Echo 'The following QSOs were found on the same band, mode, date and time difference 30 minutes:';
+	echo '<table style="width:100%" class="qsolist table-sm table-bordered table-hover table-striped table-condensed">
+	<thead>
+	<tr>
+	<th style=\'text-align: center\'>Occurrence</th>
+	<th style=\'text-align: center\'>'.$this->lang->line('gen_hamradio_callsign').'</th>
+	<th style=\'text-align: center\'>Min date</th>
+	<th style=\'text-align: center\'>Min time</th>
+	<th style=\'text-align: center\'>Max date</th>
+	<th style=\'text-align: center\'>Max time</th>
+	<th style=\'text-align: center\'>' . $this->lang->line('gen_hamradio_mode') . '</th>
+	<th style=\'text-align: center\'>' . $this->lang->line('gen_hamradio_band') . '</th>
+	<th style=\'text-align: center\'>' . $this->lang->line('gen_hamradio_station') . '</th>
+	</tr>
+	</thead><tbody>';
+
+	// Get Date format
+	if($this->session->userdata('user_date_format')) {
+		// If Logged in and session exists
+		$custom_date_format = $this->session->userdata('user_date_format');
+	} else {
+		// Get Default date format from /config/cloudlog.php
+		$custom_date_format = $this->config->item('qso_date_format');
+	}
+
+	foreach ($qsos->result() as $qso) {
+		echo '<tr>';
+		echo '<td style=\'text-align: center\'>' . $qso->occurence . '</td>';
+		echo '<td style=\'text-align: center\'><form id="searchcall" method="POST" action="'.site_url('search'). '"><input type="hidden" value="'. strtoupper($qso->COL_CALL) .'" name="callsign"><a href="javascript:$(\'#searchcall\').submit()">' . $qso->COL_CALL . '</a></form></td>';
+		echo '<td style=\'text-align: center\'>'; $timestamp = strtotime($qso->Mintime); echo date($custom_date_format, $timestamp); echo '</td>';
+		echo '<td style=\'text-align: center\'>'; $timestamp = strtotime($qso->Mintime); echo date('H:i', $timestamp); echo '</td>';
+		echo '<td style=\'text-align: center\'>'; $timestamp = strtotime($qso->Maxtime); echo date($custom_date_format, $timestamp); echo '</td>';
+		echo '<td style=\'text-align: center\'>'; $timestamp = strtotime($qso->Maxtime); echo date('H:i', $timestamp); echo '</td>';
+		echo '<td style=\'text-align: center\'>'; echo $qso->COL_SUBMODE==null?$qso->COL_MODE:$qso->COL_SUBMODE; echo '</td>';
+		echo '<td style=\'text-align: center\'>'; if($qso->COL_SAT_NAME != null) { echo $qso->COL_SAT_NAME; } else { echo strtolower($qso->COL_BAND); }; echo '</td>';
+		echo '<td style=\'text-align: center\'><span class="badge badge-light">' . $qso->station_callsign . '</span></td>';
+		echo '</tr>';
+	}
+
+	echo '</tbody></table>';
+	?>
+
+	<?php
+} else {
+	echo '<div class="alert alert-danger"><a href="#" class="close" data-dismiss="alert" aria-label="close">&times;</a>No duplicate QSO\'s were found.</div>';
+}
+?>
\ No newline at end of file
diff --git a/application/views/search/filter.php b/application/views/search/filter.php
index e4c632df..380717d8 100644
--- a/application/views/search/filter.php
+++ b/application/views/search/filter.php
@@ -21,6 +21,9 @@
 	      </li>
 	      <li class="nav-item">
 	        <a class="nav-link active" href="<?php echo site_url('search/filter'); ?>">Advanced Search</a>
+	      </li>
+		  <li class="nav-item">
+	        <a class="nav-link" href="<?php echo site_url('search/duplicates'); ?>">Duplicate QSOs</a>
 	      </li>
 	    </ul>
 	  </div>
diff --git a/application/views/search/main.php b/application/views/search/main.php
index da2c2892..df09c491 100644
--- a/application/views/search/main.php
+++ b/application/views/search/main.php
@@ -13,6 +13,9 @@
 	      </li>
 	      <li class="nav-item">
 	        <a class="nav-link" href="<?php echo site_url('search/filter'); ?>">Advanced Search</a>
+	      </li>
+		  <li class="nav-item">
+	        <a class="nav-link" href="<?php echo site_url('search/duplicates'); ?>">Duplicate QSOs</a>
 	      </li>
 	    </ul>
 	  </div>