Why such a "thick" cable ? You only need some serial cable to get all the data. Station a battery on the lauch stand so that you do not have to deal with IR drop from the block-house (Optional). Build a small telemetry connect box to receive all the data from on-board electronics (As I understand this may mean some modifications for on board systems ?) Serialize data back to block house. Control can be easily coded/decoded across same link.
Why a mechanical relay in a vibrartion environment ? Why not a Solid State Relay ? ---- Original message ---- >Date: Sat, 13 Jul 2002 23:31:46 -0700 >From: David Weinshenker <[EMAIL PROTECTED]> >Subject: Re: [ERPS] Busy day in Mojave yesterday... >To: [EMAIL PROTECTED] > >Randall Clague wrote: >> >> On Sat, 13 Jul 2002 11:47:00 -0700, David Weinshenker >> <[EMAIL PROTECTED]> wrote: >> >> >Randall Clague wrote: >> >> 11) Load rocket on rail >> >> 12) Fuel rocket >> >> 13) Pressurize rocket >> >> 14) Arm pyro >> >> 15) Launch >> > >> >You reversed the sequence on #13 and #14. We load the propellant, >> >switch on the electronics, and then retreat to the blockhouse for >> >pressurizing. >> >> We did it that way previously, yes. We need in the future to arm the >> pyro remotely, and the sooner we make that change, the better. > >Feature request noted... it's going to add _significant_ complexity, since >the status indicators will need to be remoted as well, and we will need >an on-borar electronic latching circuit controlling the arming relay, for >reliability. > >(Direct relay latching, where the relay coil is kept energized by current >flowing through a contact on the relay, has the possible failure mode that >if the contacts open momentarily due to vibration, the relay will lose >coil power and drop out to the "off" state, resulting in the recovery >system disarming itself in flight.... not good.) > >Sounds like the system is going to grow a rather thick cable bundle >between the electrical umbical and the blockhouse systems, once we >implement that sort of feature... especially if we sequence it before >the "Spike" telemetry system. (Once we have a general purpose digital >data stream coming back from the rocket, it will be possible to include >a "recovery system status byte" along with the A/D data.) > >-dave w >_______________________________________________ >ERPS-list mailing list >[EMAIL PROTECTED] >http://lists.erps.org/mailman/listinfo/erps-list _______________________________________________ ERPS-list mailing list [EMAIL PROTECTED] http://lists.erps.org/mailman/listinfo/erps-list
