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● (No.217) 衛星OO-38(OPAL) の現況 (2000年9月14日)
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Date: Mon, 04 Sep 2000 17:30:48 +0900
From: Mineo Wakita [je9pel@jamsat.or.jp]
To: jamsat-bb@jamsat.or.jp
Subject: [jamsat-bb:5599] OPAL Beacon
衛星OO-38(OPAL)のデジタルビーコンを半年ぶりに聞いてみました。
Sep 4, 08:08-08:22, 09:48-09:59 JST 2000
437.100MHz(+/- doppler), 9600bps_FSK
弱い信号を１分ごとに発信していました。衛星が太平洋上を飛ぶような
条件の良い時でないと、受信デコードが困難です。 (数値意味不明)
KF6RFX>CQ (04 Sep 2000 08:13:28 JST) [UI R]:OPAL 18:6998020925 [01]
KF6RFX>CQ (04 Sep 2000 08:16:28 JST) [UI R]:OPAL 18:6998020925 [01]
KF6RFX>CQ (04 Sep 2000 09:50:28 JST) [UI R]:OPAL 18:7220873266 [01]
KF6RFX>CQ (04 Sep 2000 09:51:28 JST) [UI R]:OPAL 18:7220873266 [01]
--------------------------------------------
Name : JE9PEL/1 脇田美根夫
Mail : je9pel@jamsat.or.jp
URL : http://www.asahi-net.or.jp/~EI7M-WKT/
QTH : Yokohama, Japan
Date : Sep 4, 2000
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====
Date: Tue, 05 Sep 2000 09:00:01 +0200
From: mike.rupprecht@t-online.de (Mike Rupprecht)
To: Mineo Wakita [je9pel@jamsat.or.jp]
Cc: amsat-bb@amsat.org
Subject: [amsat-bb:34502] Re: OPAL Beacon
Hi Mineo,
Beacon 1 send an AX.25 packet frame containing OPAL's current time stamp
and a 2 bit summary of OPAl's health. These 2 bits are defined as :
00 = all systems working nominal
01 = voltage to high
10 = temperature to high
01 = voltage to low
See also : http://ssdl.stanford.edu/opal/Operations/beacon.html
73, Mike
DL1LSZ
------------------------------------------------
Name : Mike Rupprecht, DL1LSZ, AMSAT-DL #9502099
Mail : mail@mike-rupprecht.de
URL : http://www.mike-rupprecht.de
QTH : Hoechst, GERMANY, Loc.: JN49LS
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Mineo Wakita schrieb:
>
> Today Sep 4, I received some digital beacons from OO-38(OPAL).
> She transmitted them every one minute with the weak signals.
> 437.100MHz(+/- doppler), 9600bps_FSK, KISS_mode
> Does someone know what this numerical sequence mean ?
>
> KF6RFX>CQ (03 Sep 2000 23:13:28 UTC) [UI R]:OPAL 18:6998020925 [01]
> KF6RFX>CQ (03 Sep 2000 23:16:28 UTC) [UI R]:OPAL 18:6998020925 [01]
> KF6RFX>CQ (04 Sep 2000 00:50:28 UTC) [UI R]:OPAL 18:7220873266 [01]
> KF6RFX>CQ (04 Sep 2000 00:51:28 UTC) [UI R]:OPAL 18:7220873266 [01]
>
> ----------------------------------------------
> Name : JE9PEL/Mineo Wakita, Member of JAMSAT
> Mail : je9pel@jamsat.or.jp
> URL : http://www.ne.jp/asahi/hamradio/je9pel/
> QTH : Yokohama Japan, GL:PM95TJ
> Date : Sep 4, 2000
> ----------------------------------------------
====
From: "Jay, kf6rmg" [kf6rmg@hotmail.com]
To: amsat-bb@amsat.org
Subject: [amsat-bb:34503] Re: OPAL Beacon
Date: Tue, 05 Sep 2000 00:48:40 PDT
Are you sure that [01] means voltage too high? According to the
beacon log at http://ssdl.stanford.edu/opal/Operations/opal/index.html
the beacon has reported [01] for most of its lifetime and has never
reported [00].
73, Jay, KF6RMG
P.S. OPAL telemetry logs are available at the above website, but there
is no new info there after late May.
====
[Reference]
http://ssdl.stanford.edu/opal/Operations/beacon.html
> Opal Beacon Summary
>
> Opal broadcasts two beacons. Both
> are at 437.100 MHz.
>
> * Beacon 1 - An AX.25 packet
> beacon containing Opal's
> current time stamp and a 2 bit
> summary of Opal's health.
> Example beacon:
>
> OPAL 0:0009948696 [01]
>
> "0:0009948696" is the time
> stamp. It is the number of
> clock ticks since last hard CPU
> reset onboard Opal. The number
> of seconds can be calculated
> by:
>
> seconds = (number of
> ticks> / ( 4096 )
>
> The two bit beacon "[01]" is a
> summary of health. The states
> correspond to:
>
> 00 -
> 01 -
> 10 -
> 11 -
>
> * Beacon 2 - A continuous wave
> pulse that encodes the two bit
> beacon. More to follow (when
> we're not exhausted!). Check
> out the paper that was written
> on it: Development of a
> Satellite Beacon Receiving
> Station
====
Date: Tue, 12 Sep 2000 20:33:11 +0900
From: Mineo Wakita [je9pel@jamsat.or.jp]
To: jamsat-bb@jamsat.or.jp
Subject: [jamsat-bb:5647] OPAL Beacon
衛星OO-38(OPAL)のビーコンを、本日9月12日(火) 受信してみました。
前回(4日)は１分ごとでしたが、本日は10秒ごとに送信していました。
437.100MHz(+/- doppler), 9600bps_FSK. Time is JST:
KF6RFX>CQ [12 Sep 2000 08:50:00] [UI R]:OPAL 19:2888678815 [01]
KF6RFX>CQ [12 Sep 2000 08:50:10] [UI C]:OPAL 19:2888678815 [01]
KF6RFX>CQ [12 Sep 2000 08:50:20] [UI R]:OPAL 19:2888678815 [01]
KF6RFX>CQ [12 Sep 2000 08:50:30] [UI R]:OPAL 19:2888678815 [01]
KF6RFX>CQ [12 Sep 2000 08:50:40] [UI R]:OPAL 19:2888678815 [01]
次のOPALのホームページによると、この数値は CPUのリセットタイム
(リセット以降の経過時間)を表示してしているらしいのですが、この
データを見る限り、数値が変化していません。 理由は不明です。
http://ssdl.stanford.edu/opal/Operations/beacon.html
'Opal Beacon Summary' say :
> Beacon 1 - An AX.25 packet beacon containing Opal's current
> time stamp and a 2 bit summary of Opal's health.
> Example beacon: OPAL 0:0009948696 [01]
>
> "0:0009948696" is the time stamp. It is the number of clock
> ticks since last hard CPU reset onboard Opal. The number of
> seconds can be calculated by:
>
> seconds = (number of ticks> / ( 4096 )
なお、各ビーコンの最後の２ビットデータは衛星の状態を表している
のですが、それは次のような意味があるようです。(未確認)
> 00 = 全システム正常
> 01 = 電圧上昇
> 10 = 温度上昇
> 11 = 電圧低下
----------------------------------------------
Name : JE9PEL/1 脇田
Mail : je9pel@jamsat.or.jp
URL : http://www.ne.jp/asahi/hamradio/je9pel/
QTH : Yokohama, Japan
Date : Sep 12, 2000
----------------------------------------------
====
Date: Wed, 13 Sep 2000 07:03:24 +0200
From: mike.rupprecht@t-online.de (Mike Rupprecht)
To: Mineo Wakita [je9pel@jamsat.or.jp]
Cc: amsat-bb@amsat.org, jwc@stanford.edu, btwiggs@leland.stanford.edu
Subject: [amsat-bb:34748] Re: OPAL Beacon
Hi Mineo,
Yes, the description of the 2 bits is right.
The time stamp changes only every pass:
05.09.2000 0535 UTC OPAL 18:1445291277 [01]
05.09.2000 0715 UTC OPAL 18:1668142770 [01]
05.09.2000 0854 UTC OPAL 18:1991000565 [01]
To the time stamp I have the following acceptance, but I'm not sure:
OPAL 18:1991000565 [01]
XX:XXZZZZZZZZ
Z : The difference is average 22855000 ticks. These are about
5580 seconds
(22855000 / 4096) -> 93 minutes. Is this the period of opal?
73, Mike
------------------------------------------------
Name : Mike Rupprecht, DL1LSZ, AMSAT-DL #9502099
Mail : mail@mike-rupprecht.de
URL : http://www.qsl.net/dl1lsz
QTH : Hoechst, GERMANY, Loc.: JN49LS
------------------------------------------------
Mineo Wakita schrieb:
>
> I received again some digital beacons from OO-38(OPAL).
> She transmitted them every 10 seconds with 437.100MHz
> (+/- doppler), and 9600bps_FSK. Time is UTC:
>
> KF6RFX>CQ [11 Sep 2000 23:50:00] [UI R]:OPAL 19:2888678815 [01]
> KF6RFX>CQ [11 Sep 2000 23:50:10] [UI C]:OPAL 19:2888678815 [01]
> KF6RFX>CQ [11 Sep 2000 23:50:20] [UI R]:OPAL 19:2888678815 [01]
> KF6RFX>CQ [11 Sep 2000 23:50:30] [UI R]:OPAL 19:2888678815 [01]
> KF6RFX>CQ [11 Sep 2000 23:50:40] [UI R]:OPAL 19:2888678815 [01]
>
> In the URL, http://ssdl.stanford.edu/opal/Operations/beacon.html
>
> 'Opal Beacon Summary' say :
> > Beacon 1 - An AX.25 packet beacon containing Opal's current
> > time stamp and a 2 bit summary of Opal's health.
> > Example beacon: OPAL 0:0009948696 [01]
> >
> > "0:0009948696" is the time stamp. It is the number of clock
> > ticks since last hard CPU reset onboard Opal. The number of
> > seconds can be calculated by:
> >
> > seconds = (number of ticks> / ( 4096 )
>
> Q1. I don't know why the above today's data doesn't change.
> Q2. Do the next two bit health states beacon are right ?
>
> > 00 = all systems working nominal
> > 01 = voltage to high
> > 10 = temperature to high
> > 11 = voltage to low
>
> ----------------------------------------------
> Name : JE9PEL/Mineo Wakita, Member of JAMSAT
> Mail : je9pel@jamsat.or.jp
> URL : http://www.ne.jp/asahi/hamradio/je9pel/
> QTH : Yokohama Japan, GL:PM95TJ
> Date : Sep 12, 2000
> ----------------------------------------------
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