+__xdata uint8_t ao_serial_number = 2;
+
+/* XXX make callsigns real */
+__xdata char ao_callsign[AO_MAX_CALLSIGN] = "KD7SQG";
+
+__xdata uint16_t ao_telemetry_interval = 0;
+__xdata uint8_t ao_rdf = 0;
+__xdata uint16_t ao_rdf_time;
+
+#define AO_RDF_INTERVAL AO_SEC_TO_TICKS(3)