[ARTS] FW: ARTS arming position

Sat Aug 1 12:04:32 PDT 2009

Jason, 

I have an account which I set up years back. I bought a zillion high gee
reeds at that time. Somehow, I am now down to 6. I have used them in RC
toys, business, security, remote control, you name it. They all work. Since
they are made to not activate from vibration, gees are not a problem. It
really comes down to your needs. I use reeds that I installed into my own
packages which requires soldering or shrink wrapping. You need to call and
tell them that you want to buy just the reed switches with or without leads
and with or without both leads (they will cut one for you). The links below
are some I have used. If you exceed amperage the unit locks closed once
armed. This is good for one time applications. I have used this approach,
but if you need to power down, your screwed unless you have the bay designed
for slide in slide out switching. If you get creative, you can use the
magnets to power up the electronics until launch time, which comes in handy
for long preps and limited on board power.

http://www.grisk.com/surface_mount/pdf/500%20Series.pdf

http://www.grisk.com/surface_mount/100.htm

http://www.grisk.com/recessed/mighty_mag.htm

http://www.grisk.com/surface_mount/505.htm

http://www.grisk.com/surface_mount/pdf/100-110%20series.pdf

I just edited the flight I posted before I left the country. Long flights
are good for editing video. Anyway, I have posted the final version - 

http://www.youtube.com/watch?v=6czamPHPjpY.  In the video you can see that
even when the video camera slipped and broke the antenna, the magnetic
switching worked as it did on the RDAS power supply. The bay took some
serious vibration. If you check the graph, you can see there was a lot of
vibration and still no connection problem from the switch. Channel 5
recorded the x axis.  Channel 1 was recorded power.

Arnold

From: arts-bounces at lokiresearch.com [mailto:arts-bounces at lokiresearch.com]
On Behalf Of Jason Andersen
Sent: Friday, July 31, 2009 10:12 PM
To: arts at lokiresearch.com
Subject: Re: [ARTS] FW: ARTS arming position

Hi Arnold,

What switch do you use? The http://www.grisk.com/recessed/2120-12.htm ?  I'm
only guessing....   Specifics are always good.  J

Thanks,

Jason <<<<< Always looking for a better switch option..

From: arts-bounces at lokiresearch.com [mailto:arts-bounces at lokiresearch.com]
On Behalf Of Arnold
Sent: Friday, July 31, 2009 6:28 PM
To: arts at lokiresearch.com; 'Arnold'
Subject: [ARTS] FW: ARTS arming position

The rocket in the video at http://www.youtube.com/watch?v=8n_WIc_EOAw
contained two magnetic switches. The RDAS was activated by a magnetic switch
as was the video camera. Unfortunately, the antenna was damaged after the
video unit slipped in the frame. I was able to find a viewable frame at
16000', but for all purposes the video ends at about 600'. The RDAS
transmitted never lost power even though the patch antenna was dislodged at
apogee, it still gave me GPS coordinates. In short, the magnetic switch is
robust. I always position the switch so open end of the reed is facing up
and open when the magnet is removed. 

I usually buy my switches from GRI - http://www.grisk.com/. 

From: Tomsrockets at aol.com [mailto:Tomsrockets at aol.com] 
Sent: Monday, July 27, 2009 12:15 PM
To: arnold.roquerre at verizon.net; arts at lokiresearch.com
Subject: Re: [ARTS] ARTS arming position

Thanks all for your help.

The magnetic switch may work for our application.  Any particular
manufacture or product number of magnetic switch you have used and found to
be reliable?  Thank you

Tom Ciolino

In a message dated 7/26/2009 10:16:17 A.M. Central Daylight Time,
arnold.roquerre at verizon.net writes:

I have found magnetic switches very useful. They have a high gee rating and
are very easy to arm. You simply pull off the magnet. I have never had a
failure using magnetic switches. The basic reed model with no housing is the
most flexible, but the standard model works. One just has to remember to use
the normally open terminals since the switch is to remain open while the
magnet is present and closed when removed. The only limitation is you can
only run 1 amp through them. For higher amperage there are ones available,
but they are more expensive. I have found having the reed activate other
high gee relays an easy work around. 

----- Original Message ----- 

From: Tomsrockets at aol.com 

To: arts at lokiresearch.com 

Sent: Sunday, July 26, 2009 7:45 AM

Subject: [ARTS] ARTS arming position

I am helping out with a project that involves a tall rocket.  Issue is
trying to find a way to arm electronics without having a 12 foot ladder on
the Black Rock playa.  I know the ARTS manual states that the altimeter
should only be armed in the upright firing position.  How does the ARTS
determine its' baseline position upon arming, and how would arming the
altimeter in the horizontal position cause problems after launch?  What is
the minimum G force or acceleration required to put it into flight mode?
Thanks

Tom Ciolino

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