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CX2SA > SATDIG 14.03.10 21:07l 318 Lines 10787 Bytes #999 (0) @ WW
BID : AMSATBB5121
Read: GUEST
Subj: AMSAT-BB-digest V5 121
Path: IZ3LSV<IK3GET<IW2OHX<OE6XPE<DB0RES<DK0WUE<7M3TJZ<CX2SA
Sent: 100314/1902Z @:CX2SA.LAV.URY.SA #:45753 [Minas] FBB7.00e $:AMSATBB5121
From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. Business trip may allow some fairly rare grids
(Gary "Joe" Mayfield)
2. use of PI in amsat development practice (Samudra Haque)
3. AO-51 is off (Andrew Glasbrenner)
4. Re: Playing With Lightning (Wayne Estes)
5. Re: use of PI in amsat development practice (Bent OZ6BL)
6. Re: use of PI in amsat development practice
(Doug Faunt N6TQS +1-510-655-8604)
7. Re: use of PI in amsat development practice (James Duffey)
----------------------------------------------------------------------
Message: 1
Date: Sun, 14 Mar 2010 11:00:05 -0500
From: "Gary \"Joe\" Mayfield" <gary_mayfield@xxxxxxx.xxx>
Subject: [amsat-bb] Business trip may allow some fairly rare grids
To: <amsat-bb@xxxxx.xxx>
Message-ID: <COL114-DS18BC50262A913D598873B98A2F0@xxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"
I?ll be headed North and West this week and may have the chance
to hand out some fairly rare ones with my FT-470 and trusty Arrow antenna.
This is a business trip and business comes first! None of these times/grids
are guaranteed in anyway. I hope operate the following (all times in UTC)
windows:
22:30 3/15/2010 -- Until 13:00 3/16/2010 (I have to sleep too) from DN67 or
68 (Any Preference?)
1:00 3/17/2010 -- Until 12:00 3/17/2010 from DN68 (I have to sleep too)
1:00 3/18/2010 -- Until 13:00 3/18/2010 from DN55 (I know Billings is not
that rare)
22:30 3/18/2010 -- Until 12:00 3/19/2010 from DN 66 or 76 (Any Preference?)
After 12:00 UTC on 3/19/2010 I may show up from any one of the following
grids for a single pass on the way home (DN76, DN86, DN85, or DN95).
I hope work won?t interfere with my play too much during the evening, but
there is always the chance that a meeting just continues on through dinner
and into the night. In that case I will not be on.
73,
Joe kk0sd
------------------------------
Message: 2
Date: Sun, 14 Mar 2010 11:22:31 -0500
From: Samudra Haque <samudra.haque@xxxxx.xxx>
Subject: [amsat-bb] use of PI in amsat development practice
To: Amsat-bb <amsat-bb@xxxxx.xxx>
Message-ID:
<d8c724881003140922y32770d5ag29e9976c76ca1dac@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Hi, Pi-Day is today (3/14/2010) also we just sprang forward by 1 hour.
(http://www.cnn.com/2010/TECH/03/12/pi.day.math/index.html?hpt=C2) and
apparently it's also Einsteins Birthday!
(http://en.wikipedia.org/wiki/Albert_Einstein)
Wow a lot of key dates here.
My question is: in amateur satellite design/planning how many
significant digits are used to calculate the value of pi? Is there a
significant difference in results between (4 decimal poinits) and (3
decimal points).
In professional space missions, such as NASA, what is the practice
with regards to use of Pi ? Are there any published standards?
Using Excel, is there any way to generate a large range of pi ?
-samudra N3RDX
------------------------------
Message: 3
Date: Sun, 14 Mar 2010 12:35:49 -0400
From: Andrew Glasbrenner <glasbrenner@xxxxxxxxxx.xxx>
Subject: [amsat-bb] AO-51 is off
To: Amsat-BB <amsat-bb@xxxxx.xxx>
Message-ID: <4B9D1065.1010302@xxxxxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
It appears AO-51 is off. If the problem is what I think it is, I should
be able to restart it on the 2150Z pass this afternoon.
73, Drew KO4MA
AMSAT-NA VP Operations
------------------------------
Message: 4
Date: Sun, 14 Mar 2010 09:43:14 -0700
From: Wayne Estes <w9ae@xxxxxxx.xxx>
Subject: [amsat-bb] Re: Playing With Lightning
To: amsat-bb@xxxxx.xxx
Message-ID: <4B9D1222.4050205@xxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
If you live in an area prone to lightning (especially Florida) you
should invest in a good ground system and single-point ground panel with
surge suppressors for all antennas, rotor/control cables, AC lines, and
internet/phone connections. It's very costly and a lot of work to
install. But the alternatives (destroyed equipment or even a burning
house) are even worse. The information and required equipment is out there.
Wayne Estes W9AE
Oakland, Oregon, USA (where lightning is extremely rare)
------------------------------
Message: 5
Date: Sun, 14 Mar 2010 18:01:14 +0100
From: Bent OZ6BL <oz6bl@xxxx.xx>
Subject: [amsat-bb] Re: use of PI in amsat development practice
To: amsat-bb@xxxxx.xxx
Message-ID: <4B9D165A.8050200@xxxx.xx>
Content-Type: text/plain; charset=UTF-8
On 2010-03-14 17:22, Samudra Haque wrote:
> Hi, Pi-Day is today (3/14/2010) also we just sprang forward by 1 hour.
> (http://www.cnn.com/2010/TECH/03/12/pi.day.math/index.html?hpt=C2) and
> apparently it's also Einsteins Birthday!
> (http://en.wikipedia.org/wiki/Albert_Einstein)
>
> Wow a lot of key dates here.
>
>
Unfortunately Pi-day can not be celebrated in Europe as we have no month
14 over here. ;-)
> My question is: in amateur satellite design/planning how many
> significant digits are used to calculate the value of pi? Is there a
> significant difference in results between (4 decimal poinits) and (3
> decimal points).
>
> In professional space missions, such as NASA, what is the practice
> with regards to use of Pi ? Are there any published standards?
>
> Using Excel, is there any way to generate a large range of pi ?
>
>
I have often used the expression
pi = 4 * arctan(1)
to get Pi with full machine accuracy in a program.
73, Bent
------------------------------
Message: 6
Date: Sun, 14 Mar 2010 13:36:50 -0400 (EDT)
From: Doug Faunt N6TQS +1-510-655-8604 <faunt@xxxxx.xxx>
Subject: [amsat-bb] Re: use of PI in amsat development practice
To: oz6bl@xxxx.xx
Cc: amsat-bb@xxxxx.xxx
Message-ID: <20100314173650.422C38FDDE@xxxxxx.xxxxx.xxx>
Date: Sun, 14 Mar 2010 18:01:14 +0100
From: Bent OZ6BL <oz6bl@xxxx.xx>
On 2010-03-14 17:22, Samudra Haque wrote:
> Hi, Pi-Day is today (3/14/2010) also we just sprang forward by 1 hour.
> (http://www.cnn.com/2010/TECH/03/12/pi.day.math/index.html?hpt=C2) and
> apparently it's also Einsteins Birthday!
> (http://en.wikipedia.org/wiki/Albert_Einstein)
>
> Wow a lot of key dates here.
>
>
Unfortunately Pi-day can not be celebrated in Europe as we have no month
14 over here. ;-)
To a reasonable approximation, you can celebrate on 22/7.
73, doug
------------------------------
Message: 7
Date: Sun, 14 Mar 2010 12:00:37 -0600
From: James Duffey <jamesduffey@xxxxxxx.xxx>
Subject: [amsat-bb] Re: use of PI in amsat development practice
To: Samudra Haque <samudra.haque@xxxxx.xxx>
Cc: James Duffey <jamesduffey@xxxxxxx.xxx>, Amsat-bb
<amsat-bb@xxxxx.xxx>
Message-ID: <A8463BC8-0F16-4E3F-AA98-C1BC5CE37494@xxxxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
Pi to over a million places in ASCII can be found at Project Gutenberg:
< http://www.gutenberg.org/cache/epub/50/pg50.txt >
For your accurate use, here are the first 3,142:
Pi
3.
1415926535 8979323846 2643383279 5028841971 6939937510
5820974944 5923078164 0628620899 8628034825 3421170679
8214808651 3282306647 0938446095 5058223172 5359408128
4811174502 8410270193 8521105559 6446229489 5493038196
4428810975 6659334461 2847564823 3786783165 2712019091
4564856692 3460348610 4543266482 1339360726 0249141273
7245870066 0631558817 4881520920 9628292540 9171536436
7892590360 0113305305 4882046652 1384146951 9415116094
3305727036 5759591953 0921861173 8193261179 3105118548
0744623799 6274956735 1885752724 8912279381 8301194912
9833673362 4406566430 8602139494 6395224737 1907021798
6094370277 0539217176 2931767523 8467481846 7669405132
0005681271 4526356082 7785771342 7577896091 7363717872
1468440901 2249534301 4654958537 1050792279 6892589235
4201995611 2129021960 8640344181 5981362977 4771309960
5187072113 4999999837 2978049951 0597317328 1609631859
5024459455 3469083026 4252230825 3344685035 2619311881
7101000313 7838752886 5875332083 8142061717 7669147303
5982534904 2875546873 1159562863 8823537875 9375195778
1857780532 1712268066 1300192787 6611195909 2164201989
3809525720 1065485863 2788659361 5338182796 8230301952
0353018529 6899577362 2599413891 2497217752 8347913151
5574857242 4541506959 5082953311 6861727855 8890750983
8175463746 4939319255 0604009277 0167113900 9848824012
8583616035 6370766010 4710181942 9555961989 4676783744
9448255379 7747268471 0404753464 6208046684 2590694912
9331367702 8989152104 7521620569 6602405803 8150193511
2533824300 3558764024 7496473263 9141992726 0426992279
6782354781 6360093417 2164121992 4586315030 2861829745
5570674983 8505494588 5869269956 9092721079 7509302955
3211653449 8720275596 0236480665 4991198818 3479775356
6369807426 5425278625 5181841757 4672890977 7727938000
8164706001 6145249192 1732172147 7235014144 1973568548
1613611573 5255213347 5741849468 4385233239 0739414333
4547762416 8625189835 6948556209 9219222184 2725502542
5688767179 0494601653 4668049886 2723279178 6085784383
8279679766 8145410095 3883786360 9506800642 2512520511
7392984896 0841284886 2694560424 1965285022 2106611863
0674427862 2039194945 0471237137 8696095636 4371917287
4677646575 7396241389 0865832645 9958133904 7802759009
9465764078 9512694683 9835259570 9825822620 5224894077
2671947826 8482601476 9909026401 3639443745 5305068203
4962524517 4939965143 1429809190 6592509372 2169646151
5709858387 4105978859 5977297549 8930161753 9284681382
6868386894 2774155991 8559252459 5395943104 9972524680
8459872736 4469584865 3836736222 6260991246 0805124388
4390451244 1365497627 8079771569 1435997700 1296160894
4169486855 5848406353 4220722258 2848864815 8456028506
0168427394 5226746767 8895252138 5225499546 6672782398
6456596116 3548862305 7745649803 5593634568 1743241125
1507606947 9451096596 0940252288 7971089314 5669136867
2287489405 6010150330 8617928680 9208747609 1782493858
9009714909 6759852613 6554978189 3129784821 6829989487
2265880485 7564014270 4775551323 7964145152 3746234364
5428584447 9526586782 1051141354 7357395231 1342716610
2135969536 2314429524 8493718711 0145765403 5902799344
0374200731 0578539062 1983874478 0847848968 3321445713
8687519435 0643021845 3191048481 0053706146 8067491927
8191197939 9520614196 6342875444 0643745123 7181921799
9839101591 9561814675 1426912397 4894090718 6494231961
5679452080 9514655022 5231603881 9301420937 6213785595
6638937787 0830390697 9207734672 2182562599 6615014215
0306803844 7734549202 6054146659 2520149744 28
------------------------------
_______________________________________________
Sent via amsat-bb@xxxxx.xxx. Opinions expressed are those of the author.
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End of AMSAT-BB Digest, Vol 5, Issue 121
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