Cute-1.7 : FM Packets for 24 hours

Hiroki Ashida provides an update on the Cute-1.7 Amateur Radio satellite.

From the AMSAT Bulletin Board (AMSAT-BB):

Dear All,

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

We started a long-run (continuous 24hours) of the APD sensor at 11:30, Jun 3 (UTC) and it will be turned off on 11:30, Jun 4(UTC). During the APD is turned on, the APD status packet can be heard everywhere in the world.

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 obtaininformations 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 08154.79960534 .00000134 00000-0 24077-4 0 664

2 32785 097.9934 214.7536 0014695 178.3289 181.7972 14.81362228 5275

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!

Best Regards,

Hiroki Ashida

Cute-1.7 + APD II
Hiroki Ashida <hiroki@lss.mes.titech.ac.jp>
Laboratory for Space Systems
Department of Mechano-Aerospace Engineering
Tokyo Institute of Technology

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