[altusmetrum] altusmetrum Digest, Vol 64, Issue 1

Sam Fineberg sam at fineberg.net
Fri Apr 15 11:26:01 MDT 2016


I wouldn't do it, its just another place to introduce points of failure, 
and I didn't for my L3.  Most L3CC's just want to see wiring according 
to the altimeter manufacturer's specs.

Sam

On 4/15/2016 1:02 PM, Chris Attebery wrote:
> Double check with your L3CC. I've read in several places that NAR 
> dropped that requirement. Personally I think it just adds complexity 
> and more room for human error.
>
> On Fri, Apr 15, 2016 at 9:52 AM, Rob Derstadt <rderstadt at gmail.com 
> <mailto:rderstadt at gmail.com>> wrote:
>
>     I agree with the horizontal "safe mode" technique. It's what I use
>     now.
>
>     The current NAR requirement states:
>
>     "The capability must exist to externally disarm all pyrotechnic
>     devices on-board the rocket. In this context, ‘disarm’ means the
>     ability to physically break the connection between a pyrotechnic
>     system and its power source. ***Simply turning off the device
>     controlling the pyrotechnic(s) may not be sufficient.***"
>
>     4.
>
>
>     So is this really just using the other pole on the rotary switch
>     to control the battery connection?
>
>
>
>     On Fri, Apr 15, 2016 at 10:37 AM,
>     <altusmetrum-request at lists.gag.com
>     <mailto:altusmetrum-request at lists.gag.com>> wrote:
>
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>         Today's Topics:
>
>            1. Advice on wiring dual Telemetrums for arm/safe? (Rob
>         Derstadt)
>            2. Re: Advice on wiring dual Telemetrums for arm/safe? (w9ya)
>            3. Re: Advice on wiring dual Telemetrums for arm/safe? (w9ya)
>            4. Re: Advice on wiring dual Telemetrums for arm/safe?
>               (Chris Attebery)
>
>
>         ----------------------------------------------------------------------
>
>         Message: 1
>         Date: Fri, 15 Apr 2016 09:57:17 -0600
>         From: Rob Derstadt <rderstadt at gmail.com
>         <mailto:rderstadt at gmail.com>>
>         To: altusmetrum at lists.gag.com <mailto:altusmetrum at lists.gag.com>
>         Subject: [altusmetrum] Advice on wiring dual Telemetrums for
>         arm/safe?
>         Message-ID:
>                
>         <CACyCNxQ1cSrDAukeyi2oBJzegyEgspFa4MD7FiNt4peziOBbew at mail.gmail.com
>         <mailto:CACyCNxQ1cSrDAukeyi2oBJzegyEgspFa4MD7FiNt4peziOBbew at mail.gmail.com>>
>         Content-Type: text/plain; charset="utf-8"
>
>         Hello,
>
>         I'm trying to work out how to wire up the outputs of two
>         Telemetrums (one
>         primary, one backup) so that I can add an extra arm/disarm
>         rotary switch
>         between the outputs and the terminal blocks (the NAR L3
>         requirement to cut
>         power completely from the pyro's).
>
>         This is my initial wiring diagram:
>
>         https://github.com/robderstadt/NAR-L3-Project/blob/master/images/plans/GizmoXL_Wiring.png
>
>         Normally I'd just *try* it and see what happens, but I don't
>         want to fry
>         two board if I get it wrong. I'm also concerned that in the
>         "safe" position
>         that the continuity indicator on each board would still
>         indicate everything
>         green, which could lead to a launch with the pyro's inhibited.
>
>         Has anyone flown this configuration before? If so, any
>         suggestions on how
>         to hook it up?
>
>         Thanks guys.
>
>         -Rob
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>         ------------------------------
>
>         Message: 2
>         Date: Fri, 15 Apr 2016 10:23:24 -0600
>         From: w9ya <w9ya at qrparci.net <mailto:w9ya at qrparci.net>>
>         To: Altus Metrum <altusmetrum at lists.gag.com
>         <mailto:altusmetrum at lists.gag.com>>
>         Subject: Re: [altusmetrum] Advice on wiring dual Telemetrums for
>                 arm/safe?
>         Message-ID:
>                
>         <CAASHNdXAcBka=e8+mvwy+EQ1kvVrLaxUHv4Jkmdzz6VhpNx2HA at mail.gmail.com
>         <mailto:e8%2Bmvwy%2BEQ1kvVrLaxUHv4Jkmdzz6VhpNx2HA at mail.gmail.com>>
>         Content-Type: text/plain; charset="utf-8"
>
>         Um, please check with your L3CC.....quite a few of them do NOT
>         want you to
>         fly with switches in series with your charges !!
>
>         Best regards;
>
>         Bob F.
>
>         On Fri, Apr 15, 2016 at 9:57 AM, Rob Derstadt
>         <rderstadt at gmail.com <mailto:rderstadt at gmail.com>> wrote:
>
>         > Hello,
>         >
>         > I'm trying to work out how to wire up the outputs of two
>         Telemetrums (one
>         > primary, one backup) so that I can add an extra arm/disarm
>         rotary switch
>         > between the outputs and the terminal blocks (the NAR L3
>         requirement to cut
>         > power completely from the pyro's).
>         >
>         > This is my initial wiring diagram:
>         >
>         >
>         >
>         https://github.com/robderstadt/NAR-L3-Project/blob/master/images/plans/GizmoXL_Wiring.png
>         >
>         > Normally I'd just *try* it and see what happens, but I don't
>         want to fry
>         > two board if I get it wrong. I'm also concerned that in the
>         "safe" position
>         > that the continuity indicator on each board would still
>         indicate everything
>         > green, which could lead to a launch with the pyro's inhibited.
>         >
>         > Has anyone flown this configuration before? If so, any
>         suggestions on how
>         > to hook it up?
>         >
>         > Thanks guys.
>         >
>         > -Rob
>         >
>         > _______________________________________________
>         > altusmetrum mailing list
>         > altusmetrum at lists.gag.com <mailto:altusmetrum at lists.gag.com>
>         > http://lists.gag.com/mailman/listinfo/altusmetrum
>         >
>         >
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>         ------------------------------
>
>         Message: 3
>         Date: Fri, 15 Apr 2016 10:33:25 -0600
>         From: w9ya <w9ya at qrparci.net <mailto:w9ya at qrparci.net>>
>         To: Altus Metrum <altusmetrum at lists.gag.com
>         <mailto:altusmetrum at lists.gag.com>>
>         Subject: Re: [altusmetrum] Advice on wiring dual Telemetrums for
>                 arm/safe?
>         Message-ID:
>                
>         <CAASHNdX4uphXHXGn+RJH1mKK81QOMsER7P6DiOYf3fwWuBsmag at mail.gmail.com
>         <mailto:CAASHNdX4uphXHXGn%2BRJH1mKK81QOMsER7P6DiOYf3fwWuBsmag at mail.gmail.com>>
>         Content-Type: text/plain; charset="utf-8"
>
>         P.S.... with the "flight mode" safeguards (turning on the unit
>         while
>         oriented horizontally protects you from incidental firing of
>         charges, and
>         then rebooting the TM after thee rocket has been placed on the
>         pad and made
>         ready for flight) makes the pyro activation switches
>         essentially redundant
>         !! (Virtually 100%, um; more or less....)
>
>
>         On Fri, Apr 15, 2016 at 10:23 AM, w9ya <w9ya at qrparci.net
>         <mailto:w9ya at qrparci.net>> wrote:
>
>         > Um, please check with your L3CC.....quite a few of them do
>         NOT want you to
>         > fly with switches in series with your charges !!
>         >
>         > Best regards;
>         >
>         > Bob F.
>         >
>         > On Fri, Apr 15, 2016 at 9:57 AM, Rob Derstadt
>         <rderstadt at gmail.com <mailto:rderstadt at gmail.com>> wrote:
>         >
>         >> Hello,
>         >>
>         >> I'm trying to work out how to wire up the outputs of two
>         Telemetrums (one
>         >> primary, one backup) so that I can add an extra arm/disarm
>         rotary switch
>         >> between the outputs and the terminal blocks (the NAR L3
>         requirement to cut
>         >> power completely from the pyro's).
>         >>
>         >> This is my initial wiring diagram:
>         >>
>         >>
>         >>
>         https://github.com/robderstadt/NAR-L3-Project/blob/master/images/plans/GizmoXL_Wiring.png
>         >>
>         >> Normally I'd just *try* it and see what happens, but I
>         don't want to fry
>         >> two board if I get it wrong. I'm also concerned that in the
>         "safe" position
>         >> that the continuity indicator on each board would still
>         indicate everything
>         >> green, which could lead to a launch with the pyro's inhibited.
>         >>
>         >> Has anyone flown this configuration before? If so, any
>         suggestions on how
>         >> to hook it up?
>         >>
>         >> Thanks guys.
>         >>
>         >> -Rob
>         >>
>         >> _______________________________________________
>         >> altusmetrum mailing list
>         >> altusmetrum at lists.gag.com <mailto:altusmetrum at lists.gag.com>
>         >> http://lists.gag.com/mailman/listinfo/altusmetrum
>         >>
>         >>
>         >
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>         ------------------------------
>
>         Message: 4
>         Date: Fri, 15 Apr 2016 09:37:09 -0700
>         From: Chris Attebery <chrisattebery1971 at gmail.com
>         <mailto:chrisattebery1971 at gmail.com>>
>         To: w9ya at qrparci.net <mailto:w9ya at qrparci.net>, Altus Metrum
>         <altusmetrum at lists.gag.com <mailto:altusmetrum at lists.gag.com>>
>         Subject: Re: [altusmetrum] Advice on wiring dual Telemetrums for
>                 arm/safe?
>         Message-ID:
>                
>         <CAP5dJdSNVxmzGHC_D_NqYxxTkc45Q43YApWUtX_Zkm+jq--dWQ at mail.gmail.com
>         <mailto:CAP5dJdSNVxmzGHC_D_NqYxxTkc45Q43YApWUtX_Zkm%2Bjq--dWQ at mail.gmail.com>>
>         Content-Type: text/plain; charset="utf-8"
>
>         I'm pretty sure that NAR dropped that requirement. If your L3CC is
>         insisting I'd find another.
>
>         I'm keeping my L3 wiring EXTREMELY simple. Both altimeters
>         will be direct
>         wired to the charges and use a screw switch to the enable
>         pins. No safe
>         switches, shunts, or terminal strips to intruduce points of
>         failure.
>
>         On Fri, Apr 15, 2016 at 9:23 AM, w9ya <w9ya at qrparci.net
>         <mailto:w9ya at qrparci.net>> wrote:
>
>         > Um, please check with your L3CC.....quite a few of them do
>         NOT want you to
>         > fly with switches in series with your charges !!
>         >
>         > Best regards;
>         >
>         > Bob F.
>         >
>         > On Fri, Apr 15, 2016 at 9:57 AM, Rob Derstadt
>         <rderstadt at gmail.com <mailto:rderstadt at gmail.com>> wrote:
>         >
>         >> Hello,
>         >>
>         >> I'm trying to work out how to wire up the outputs of two
>         Telemetrums (one
>         >> primary, one backup) so that I can add an extra arm/disarm
>         rotary switch
>         >> between the outputs and the terminal blocks (the NAR L3
>         requirement to cut
>         >> power completely from the pyro's).
>         >>
>         >> This is my initial wiring diagram:
>         >>
>         >>
>         >>
>         https://github.com/robderstadt/NAR-L3-Project/blob/master/images/plans/GizmoXL_Wiring.png
>         >>
>         >> Normally I'd just *try* it and see what happens, but I
>         don't want to fry
>         >> two board if I get it wrong. I'm also concerned that in the
>         "safe" position
>         >> that the continuity indicator on each board would still
>         indicate everything
>         >> green, which could lead to a launch with the pyro's inhibited.
>         >>
>         >> Has anyone flown this configuration before? If so, any
>         suggestions on how
>         >> to hook it up?
>         >>
>         >> Thanks guys.
>         >>
>         >> -Rob
>         >>
>         >> _______________________________________________
>         >> altusmetrum mailing list
>         >> altusmetrum at lists.gag.com <mailto:altusmetrum at lists.gag.com>
>         >> http://lists.gag.com/mailman/listinfo/altusmetrum
>         >>
>         >>
>         >
>         > _______________________________________________
>         > altusmetrum mailing list
>         > altusmetrum at lists.gag.com <mailto:altusmetrum at lists.gag.com>
>         > http://lists.gag.com/mailman/listinfo/altusmetrum
>         >
>         >
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>         End of altusmetrum Digest, Vol 64, Issue 1
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