Dear All,

I'm Hiroki Ashida at Tokyo Institute of Technology (JQ1YCZ) and I'd like to inform you about our satellite's operation which starts very soon.

We're preparing for a long-run (continuous 12hour) of the APD (avalanche photo-diode) carried on Cute1.7 + APD II, as a radiation monitor of low-energy (E> 10 keV) particles trapped in the LEO (low Earth orbit). While the APD is operating, the status packet of APD is transmitted every 16seconds (TBD). The observation will start at 10:40, May 21 (UTC) and the APD will be turned off on 22:40, May 21(UTC). So the APD packet can be received everywhere in the world! This is the first time that Cute-1.7 + APD II transmits its FM packet around the globe. Though the observation data will be stored in FRAMs, we'd like to know a real-time status of the APD during the observation. Your kind reports will be highly appreciated.

FM packets are transmitted on 437.475MHz and packet formats are available in the following web-page. http://lss.mes.titech.ac.jp/ssp/cute1.7/fm_mode_apd_e.html

4A-51-31-59-54-43-3E-4A-51-31-59-43-5A-3A-D0-30-77-B8-03-16-99 For exapmle, according to an above APD status packet we can obtain informations as; 4A-51-31-59-54-43-3E-4A-51-31-59-43-5A-3A : Header(JQ1YTC>JQ1YCZ) D0 : APD Packet ID (Fixed) 30 : Status Code APD Status : Operational HV Status : Set Value = Output Value Temp Correction : Active Data Mode : Counter Valid Detector : APD A APD Gain : Gain 30 Threshold : 219mV 77 : Temperature 0x77 = 119 -> (119/255)*91.712-48.569 = -5.7 [degC] B8 : High Voltage 0xB8 = 184 -> (184/255)*396.5 = 286 [V] 03-16-99 : Counter 0x1699 = 5785 -> 5785 * 2^3 = 46280

Latest TLE from NORAD is; Cute-1.7 + APD II 1 32785U 08021C 08140.34460534 +.00000335 +00000-0 +49764-4 0 00590 2 32785 097.9939 200.3316 0014139 226.7351 133.2682 14.81357711003132

Best Regards, Hiroki Ashida Cute-1.7 + APD II