Heard between 2125-2145, 5 August. 3203.6 kHz MX channel marker "L" 3246.5 kHz M21 3756 kHz S30 Pip 3828 kHz S32 Squeaky Wheel 4031 kHz Channel marker "P" + msg //4476 kHz 4325.8 kHz MX Channel marker "R" 4476 kHz Channel marker "P" + msg //4031 kHz 4503 kHz M18 4625 kHz S30 Buzzer (extremely loud) Cluster beacons P,S,C active on 4, 5, 7, 8 and 10 MHz Ary, the Netherlands