G3RUH PDF file2010年11月13日 08時03分

次の記事は、2009年6月26日に 当Blogに掲載した記事です。
この中の『 Umbrellas in the Mist 』を探していて、G3RUH, James Miller氏の
論文ばかりを集めたサイトを見つけました。下記の二つです。それでもお目当て
の 1994年6月に発行されたこのPDF記事はまだ見つけられません。(ありました.)

AO-13 スピンレート計算方法
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"Umbrellas in the Mist" by James Miller G3RUH
I'm going to tell you how to calculate Oscar-13's spin rate to 6 decimal
places. Bored already? OK, suit yourself. Go away and do something more
interesting. But would I be wasting your time and mine telling you
something this trivial if there wasn't a reason? ・・・以下続く。

これは G3RUH/James Miller氏による、『AO-13 スピンレート計算方法』に関する
内容で、1994年6月に 'Amsat-UK Oscar News #107' に掲載された貴重な論文です。
見開き 2ページ 3MB の PDFファイルです。こちらも関心のある方はご連絡下さい。
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G3RUH Articles Index
http://www.amsat.org/amsat/articles/g3ruh/g3ruh-index.html

Articles by James Miller, G3RUH
http://www.amsat.org/amsat/articles/g3ruh/bibliog.txt

CO-65 GD CONDX2010年11月13日 10時00分

本日(11/13) 09:37-09:49JST, Mel 64 East のパスは、いつにも増して絶好調。
ほぼ 100/100 のアップ率です。パワーもいつもの半分で済みました。こういう
ことはめずらしいです。なんでかな。高仰角の東回りはストレスが無い。

AO-51 38k4 運用開始2010年11月13日 10時24分

明日から (11/14-11/18)、いよいよ AO-51 L/U 38k4 の運用が開始されます。
Up 9k6 (1268.705MHz) / Down 38k4 (435.150MHz) という運用スタイルです。
ハード的に無理でも、ソフト的にはデコードできると思うので、今から少し
準備しておこうかな。

Subject: [amsat-bb] 38k4 packet operations on AO-51 Nov 14-18, 2010
From: Mark L. Hammond
Date: Fri, 12 Nov 2010 09:29:51 -0500

Hello All,

Just a reminder that we'll be running a few days of 38k4 packet
beginning Sunday afternoon/evening until Thursday afternoon/evening,
as per the schedule below.  Note the voice repeater will be OFF.

Please keep in mind that receiving packet at 38k4 requires more than
your "stock" FM receiver and TNC.  Generally speaking, folks are using
a Symek board installed in their satellite radio to tap the IF which
is then fed to a high speed TNC.  Other options for a receiver include
a PCR-1000/1500/2500 in FM mode with filters set to 50 kHz
(NOT Wide-FM)  (I think that's the right filter width).

Please remember Douglas Quagliana's KA2UPW soundcard decoder
(as presented in the AMSAT Journal a few issues back) that can be
downloaded here:  http://www.quagliana.com/   Look for Willow and
Sabins.    I suggest you get the software and test it out at 9600
before you attempt 38,400, so to become familiar with how it works
with your receiver. It does work at 38k4--but remember you must have
an appropriate receiver!

It is possible to use some of the SDR stuff I'm sure, if you record
with your SDR software and play back through KA2UPW's Willow program.

I have a few options in my shack, as I've been running 38k4 since the
good old UoSat days:

Receivers capable of 38k4 (up to 76k, actually):
TS-2000x with Symek IF board
TS-790A with Symek IF board
Icom PCR-1500

For decoding:
Paccomm Spirit/Sprint-2 Satellite TNC models with 38k4 filters installed
Willow

My preferred combination is the TS-2000x with Symek IF board feeding a
Pacomm Sprint-2 satellite model.  I seem to get the best performance
out of this combo.

Here's a reminder of the schedule:

November 14 (late UTC)
38k4 Baud PBBS Operations, L/U
Uplink: 1268.705 MHz FM at 9600 baud
Downlink: 435.150 MHz FM at 38,400 baud

November 18 (late UTC)
FM Repeater, L/SU
Uplink: 1268.705 MHz FM (no PL tone)
Downlinks: 2401.200 MHz FM *and* 435.300 MHz FM (at low power!)

73!
-- 
Mark L. Hammond [N8MH]