<h1>Cute-1.7 + APD II digital repeater test </h1>
<p>The Amateur Radio digital repeater function is now being tested on the <strong>Cute-1.7</strong> cubesat. </p>
<p>In an email on the AMSAT Bulletin Board (AMSAT-BB) Hiroki Ashida writes: </p>
<p>I'm Hiroki Ashida at Tokyo Tech (JQ1YCZ).<br>
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!</p>
<p>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!<br>
<a href="mailto:cute1.7_receive@lss.mes.titech.ac.jp" target="_blank">cute1.7_receive@lss.mes.titech.ac.jp</a></p>
<p>FM packets are transmitted on 437.475MHz and packet formats are available in the following web-page.<br>
<a href="http://lss.mes.titech.ac.jp/ssp/cute1.7/fm_mode_apd_e.html" target="_blank">http://lss.mes.titech.ac.jp/ssp/cute1.7/fm_mode_apd_e.html</a></p>
<p>4A-51-31-59-54-43-3E-4A-51-31-59-43-5A-3A-D0-30-77-B8-03-16-99</p>
<p>For example, according to an above APD status packet we can obtain informations as;</p>
<p>4A-51-31-59-54-43-3E-4A-51-31-59-43-5A-3A : Header(JQ1YTC>JQ1YCZ)<br>
D0 : APD Packet ID (Fixed)<br>
30 : Status Code<br>
APD Status : Operational<br>
HV Status : Set Value = Output Value<br>
Temp Correction : Active<br>
Data Mode : Counter Valid<br>
Detector : APD A<br>
APD Gain : Gain 30<br>
Threshold : 219mV<br>
77 : Temperature<br>
0x77 = 119 -> (119/255)*91.712-48.569 = -5.7 [degC]<br>
B8 : High Voltage<br>
0xB8 = 184 -> (184/255)*396.5 = 286 [V]<br>
03-16-99 : Counter<br>
0x1699 = 5785 -> 5785 * 23 = 46280</p>
<p> </p>
<p>Best Regards,</p>
<p><strong><em>Hiroki Ashida</em></strong></p><p><strong><em><br></em></strong></p><br clear="all"><br>-- <br>73 e Obrigado , Carlos Nora - CT1END<br>Presidente de Direcção da REP<br>TM 963 076 931<br>NNNN<br>__________________________________________________________<br>
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