Cute-1.7 + APD II digital repeater test

The Amateur Radio digital repeater function is now being tested on the Cute-1.7 cubesat.

In an email on the AMSAT Bulletin Board (AMSAT-BB) Hiroki Ashida writes:

I'm Hiroki Ashida at Tokyo Tech (JQ1YCZ).
As Mr.Hurst, Mr.Rupprecht and Mr.Henk have reported, our CW telemetry was changed. We're currently testing an amateur service function, "a digital repeater," so the message "hi hi de jq1ytc digi on" have been transmitted. I'm looking forwad to open our amateur service channel to you all!

And the APD sensor was turned on in the last pass over Japan and a long-term APD observation was started. APD status packet can be received all over the world until 12:00, Jun 11 (UTC). Your kind cooperation is greatly appreciated. If you received it, please let us know!
cute1.7_receive@lss.mes.titech.ac.jp

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 example, 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 * 23 = 46280

Best Regards,

Hiroki Ashida

Cute-1.7 + APD II
Laboratory for Space Systems
Department of Mechano-Aerospace Engineering
Tokyo Institute of Technology

AMSAT Bulletin Board AMSAT-BB
http://www.amsat.org/amsat-new/tools/maillist/maillist.php