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CX2SA > SATDIG 17.10.14 14:10l 298 Lines 8907 Bytes #999 (0) @ WW
BID : AMSATBB9357
Read: GUEST
Subj: AMSAT-BB-digest V9 357
Path: IW8PGT<IZ3LSV<IW0QNL<JH4XSY<JE7YGF<7M3TJZ<CX2SA
Sent: 141017/1201Z @:CX2SA.SAL.URY.SOAM #:11531 [Salto] FBB7.00e $:AMSATBB9357
From: CX2SA@CX2SA.SAL.URY.SOAM
To : SATDIG@WW
Today's Topics:
1. Re: Cubesat Vibration Test (Harvey N. Vordenbaum)
2. Re: Cubesat Vibration Test (Glen Gardner)
3. Rumble in the Amazon Jungle Today - Ariane 5 Lauch WebCast
(JoAnne K9JKM)
4. Re: Cubesat Vibration Test (Ted)
5. Re: Beaconsats (Alan)
----------------------------------------------------------------------
Message: 1
Date: Thu, 16 Oct 2014 08:01:58 -0500
From: "Harvey N. Vordenbaum" <tower2@xxx.xx.xxx>
To: "'Robert Bruninga'" <bruninga@xxxx.xxx>, <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] Cubesat Vibration Test
Message-ID: <000e01cfe941$5ed5ce10$1c816a30$@xx.xxx>
Content-Type: text/plain; charset="utf-8"
No conformal coating?
hv
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Robert Bruninga
Sent: Wednesday, October 15, 2014 7:18 PM
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Cubesat Vibration Test
To see the violence that a cubesat has to go through, here is a test we did
today on a power supply board.
http://aprs.org/psat/Vibe-coil-test1724.MOV (1 meg file)
It failed even before we got to the 22G requirement!
Yes, it is rocket science? a nasty place to ride?
Bob, WB4aPR
_______________________________________________
Sent via AMSAT-BB@xxxxx.xxx. AMSAT-NA makes this open forum available to all
interested persons worldwide without requiring membership. Opinions
expressed are solely those of the author, and do not reflect the official
views of AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 2
Date: Thu, 16 Oct 2014 13:19:05 +0000
From: Glen Gardner <glen.gardner@xxxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] Cubesat Vibration Test
Message-ID: <543FC5C9.60106@xxxxxxx.xxx>
Content-Type: text/plain; charset=UTF-8; format=flowed
This is why you do the shake tests.
Two thoughts come to mind here...
building for 25 G vibration and 1000 G shock is pretty much consumer
grade stuff and is easily achieved with off the shelf components.
The hard part comes in when you realize that riding on a solid rocket
motor is brutal, and results in resonances that sweep through a wide
range of frequencies during the burn. The vibration tables generally
emulate this really well and weaknesses can be exposed in short order.
If the circuit boards exhibit a resonance , components can literally be
popped right off of the board... and sometimes weaknesses internal to
the die bonding in some components can turn up as well.
If I had to rely on conformal coating to stake the parts for 22G, I'd be
worried about the payload....
Glen
AA8C
On 10/16/2014 01:01 PM, Harvey N. Vordenbaum wrote:
> No conformal coating?
> hv
>
>
> -----Original Message-----
> From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Robert Bruninga
> Sent: Wednesday, October 15, 2014 7:18 PM
> To: amsat-bb@xxxxx.xxx
> Subject: [amsat-bb] Cubesat Vibration Test
>
> To see the violence that a cubesat has to go through, here is a test we
did today on a power supply board.
>
> http://aprs.org/psat/Vibe-coil-test1724.MOV (1 meg file)
>
>
>
> It failed even before we got to the 22G requirement!
>
>
>
> Yes, it is rocket science? a nasty place to ride?
>
>
>
> Bob, WB4aPR
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. AMSAT-NA makes this open forum available to
all interested persons worldwide without requiring membership. Opinions
expressed are solely those of the author, and do not reflect the official
views of AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
expressed
> are solely those of the author, and do not reflect the official views of
AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 3
Date: Thu, 16 Oct 2014 09:20:24 -0500
From: "JoAnne K9JKM" <joanne.k9jkm@xxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Rumble in the Amazon Jungle Today - Ariane 5 Lauch
WebCast
Message-ID: <543fd427.93196b0a.1531.ffffc9d6@xx.xxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
Here is some news for those who enjoy the roar of a rocket engine in the
evening.
On the fifth Ariane 5 launch this year, Arianespace will orbit two
telecommunications satellites: Intelsat 30 for the operator Intelsat and,
Arsat-1 for the Argentine operator Arsat.
The ARIANE 5 ECA Launcher lift-off for this flight is scheduled on October
16 to 17, 2014 as soon as possible within the following launch window:
Kourou : Between 06:00pm and 07:51pm on October 16, 2014
TU/GMT : Between 09:00pm and 10:51pm on October 16, 2014
Paris : Between 11:00pm and 00:51am on October 16 to 17, 2014
Washington : Between 05:00pm and 06:51pm on October 16, 2014
Webcast of the launch will be on http://www.arianespace.tv/
--
73 de JoAnne K9JKM
k9jkm@xxxxx.xxx
AMSAT VP User Services
------------------------------
Message: 4
Date: Thu, 16 Oct 2014 16:05:16 -0700
From: "Ted" <k7trkradio@xxxxxxx.xxx>
To: "'Robert Bruninga'" <bruninga@xxxx.xxx>, <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] Cubesat Vibration Test
Message-ID: <000c01cfe995$a6f4be50$f4de3af0$@xxx>
Content-Type: text/plain; charset="utf-8"
Built like a $30.00 Baofeng HT !!
K7TRK
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Robert Bruninga
Sent: Wednesday, October 15, 2014 5:18 PM
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Cubesat Vibration Test
To see the violence that a cubesat has to go through, here is a test we did
today on a power supply board.
http://aprs.org/psat/Vibe-coil-test1724.MOV (1 meg file)
It failed even before we got to the 22G requirement!
Yes, it is rocket science? a nasty place to ride?
Bob, WB4aPR
_______________________________________________
Sent via AMSAT-BB@xxxxx.xxx. AMSAT-NA makes this open forum available to all
interested persons worldwide without requiring membership. Opinions
expressed are solely those of the author, and do not reflect the official
views of AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 5
Date: Fri, 17 Oct 2014 05:55:14 -0500
From: Alan <wa4sca@xxxxx.xxx>
To: "'Tom Schuessler'" <tjschuessler@xxxxxxx.xxx>, "'AmsatBB'"
<amsat-bb@xxxxx.xxx>
Cc: Starcom-bb@xxxxxxxx.xxx
Subject: Re: [amsat-bb] Beaconsats
Message-ID: <000101cfe9f8$d689f3c0$839ddb40$@xxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
Tom,
LU-19 has only a boring carrier, but it is strong and reliable.
73s,
Alan
WA4SCA
<-----Original Message-----
<From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Tom Schuessler
<Sent: Wednesday, October 15, 2014 11:06 PM
<To: 'AmsatBB'
<Cc: Starcom-bb@xxxxxxxx.xxx
<Subject: [amsat-bb] Beaconsats
<
<Aside from HO-68 which has a rather strong beacon CW signal, and UKube-1,
<EO-79, does anyone have any suggestions for satellites with relatively
<strong beacon signals of any kind that would make good "Track the Sat" demos
<for the JOTA event I am running this weekend. Keith Pugh, W5IU will be
<helping me with AMSAT demos but I have wondered for some time now which
<birds folks felt had the strongest, most easily tracked beacon signals.
<
<Thanks Much
<
<Tom Schuessler, N5HYP.
<n5hyp@xxxx.xxx
<
<
<_______________________________________________
<Sent via AMSAT-BB@xxxxx.xxx. AMSAT-NA makes this open forum available
<to all interested persons worldwide without requiring membership. Opinions
expressed
<are solely those of the author, and do not reflect the official views of
AMSAT-NA.
<Not an AMSAT-NA member? Join now to support the amateur satellite program!
<Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
------------------------------
_______________________________________________
Sent via amsat-bb@xxxxx.xxx.
AMSAT-NA makes this open forum available to all interested persons worldwide
without requiring membership. Opinions expressed
are solely those of the author, and do not reflect the official views of
AMSAT-NA.
Not an AMSAT member? Join now to support the amateur satellite program!
http://amsat.org/mailman/listinfo/amsat-bb
End of AMSAT-BB Digest, Vol 9, Issue 357
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