diff --git a/config-example.yml b/config-example.yml
index fb72cb6..c5b751a 100644
--- a/config-example.yml
+++ b/config-example.yml
@@ -59,14 +59,22 @@ spot-providers:
     enabled: true
     host: "hrd.wa9pie.net"
     port: 8000
+    # Prompt the cluster node gives when asking for a callsign to log in. Varies between cluster node software.
     login_prompt: "login: "
+    # Callsign Spothole will use to log into this cluster. Ensure the SSID (e.g. -99) is different to any personal
+    # connection you might make to this cluster node.
+    login_callsign: "N0CALL-99"
   -
     class: "DXCluster"
     name: "W3LPL Cluster"
     enabled: false
     host: "w3lpl.net"
     port: 7373
+    # Prompt the cluster node gives when asking for a callsign to log in. Varies between cluster node software.
     login_prompt: "Please enter your call: "
+    # Callsign Spothole will use to log into this cluster. Ensure the SSID (e.g. -99) is different to any personal
+    # connection you might make to this cluster node.
+    login_callsign: "N0CALL-99"
   -
     class: "RBN"
     name: "RBN CW/RTTY"
diff --git a/spotproviders/dxcluster.py b/spotproviders/dxcluster.py
index 173829c..cf41983 100644
--- a/spotproviders/dxcluster.py
+++ b/spotproviders/dxcluster.py
@@ -7,12 +7,11 @@ from time import sleep
 import pytz
 import telnetlib3
 
-from core.config import SERVER_OWNER_CALLSIGN
 from data.spot import Spot
 from spotproviders.spot_provider import SpotProvider
 
 
-# Spot provider for a DX Cluster. Hostname port and login_prompt provided as parameters.
+# Spot provider for a DX Cluster. Hostname, port, login_prompt and login_callsign are provided in config.
 class DXCluster(SpotProvider):
     # Note the callsign pattern deliberately excludes calls ending in "-#", which are from RBN and can be enabled by
     # default on some clusters. If you want RBN spots, there is a separate provider for that.
@@ -28,6 +27,7 @@ class DXCluster(SpotProvider):
         self.hostname = provider_config["host"]
         self.port = provider_config["port"]
         self.login_prompt = provider_config["login_prompt"]
+        self.login_callsign = provider_config["login_callsign"]
         self.telnet = None
         self.thread = Thread(target=self.handle)
         self.thread.daemon = True
@@ -50,7 +50,7 @@ class DXCluster(SpotProvider):
                     logging.info("DX Cluster " + self.hostname + " connecting...")
                     self.telnet = telnetlib3.Telnet(self.hostname, self.port)
                     self.telnet.read_until(self.login_prompt.encode("latin-1"))
-                    self.telnet.write((SERVER_OWNER_CALLSIGN + "\n").encode("latin-1"))
+                    self.telnet.write((self.login_callsign + "\n").encode("latin-1"))
                     connected = True
                     logging.info("DX Cluster " + self.hostname + " connected.")
                 except Exception as e: