highaltitude.log.20090814

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[13:05] <rjharrison> tick tock tick tock where do we stop ...
[13:06] Action: ShellEvil sighs at infrastructure.
[13:06] <rjharrison> Any launches due? I thought RocketBoy was going to launch any day
[13:06] <ShellEvil> Currently both of my DSL lines are dropping at least once per day.
[13:06] Action: rjharrison sighs too. TFI Friday ...
[13:06] <ShellEvil> And I have had 80 or so powercuts totalling about 3h in the last couple of days
[13:07] <rjharrison> You need two DSL lines?
[13:07] <ShellEvil> I got the second in order to have a backup while the first was fixed
[13:08] <rjharrison> FOC
[13:08] <rjharrison> Free of Charge
[13:08] <ShellEvil> and there is some likelyhood that as the first is not in my name (the phoneline ) - it'll go down for a week or more
[13:08] <ShellEvil> no
[13:34] Nick change: ShellEvil -> SpeedEvil
[13:43] <edmoore> afternoon rjharrison
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[14:38] <rjharrison> hey edmoore
[14:38] <rjharrison> Hows it going
[14:38] <rjharrison> Not that you'll mind it been friday as you guys are 24/7 atm
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[14:53] <edmoore> hi rjharrison - not bad, am actually taking this eve off
[15:22] <rjharrison> edmoore are cubs done
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[16:37] <edmoore> rjharrison: just doing an uplink range test now
[16:38] <edmoore> which is to say fergus takes it with him whilst going to get some tobacco, and takes my handheld, and I talk to him with the 817 and to cub with the icom
[16:38] <edmoore> it's a happy family
[16:40] <rjharrison> lol
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[17:59] <Xenion> hello everyone
[17:59] <Xenion> natrium42, are you there?
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[18:39] <rjharrison_home> !last danielrichman
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[18:51] <natrium42> d'oh, i missed Xenion
[18:59] <rjharrison_home> natrium42 only just too
[18:59] <rjharrison_home> You'll have to summon him :)
[19:01] <natrium42> it only summons jcoxon via the horses of apocalypse
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[19:26] <hallam> hi DanielRichman
[19:27] <DanielRichman> hi hallam
[19:30] <DanielRichman> hi rjharrison_home
[19:30] <natrium42> hi hallam
[19:30] <natrium42> hi DanielRichman
[19:30] <DanielRichman> hi natrium42
[19:30] <DanielRichman> hi hallam
[19:30] <DanielRichman> hi herabot
[19:30] <herabot> Hello DanielRichman!
[19:30] <DanielRichman> hi zeusbot
[19:30] <DanielRichman> hi zeusbot!!!
[19:31] <DanielRichman> pff.
[19:43] <hallam> how's it going with you guys? getting close to a launch? or did you already?
[19:45] <DanielRichman> flight computer pretty much done... need an antenna (sbasuita's job) and a box (AlexBreton's) job
[19:45] <SpeedEvil> :)
[19:46] <DanielRichman> by the time that happens school will probably have started so we can pester a teacher to buy us a balloon
[19:46] <DanielRichman> then we're rolling
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[19:47] <DanielRichman> I was considering just trying to build a moxon, but sbasuita reckons he can get a Yagi on the day
[19:47] <DanielRichman> can't hurt to have one spare though
[19:55] <hallam> a rubber duck works pretty well most of the time
[19:59] <DanielRichman> oh?
[19:59] <DanielRichman> BTW - do you need a balun if you are just receiving?
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[20:10] <RocketBoy> its less important on receive as there is no power to be reflected back.
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[20:14] <SpikeUK> RocketBoy - true, you are not going to damage anything, but without correct impedance matching ou will not get optimum gain out of the antenna.
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[20:33] <SpeedEvil> But it might melt the transmitter with the awesome output power improperly reflected! :)
[20:33] <SpeedEvil> (for 10mW anyway it's not an issue)
[20:36] <SpikeUK> Very true! BTW - just a question here. Has anyone used a 869MHz Tx for a HAB?
[20:36] <RocketBoy> SpikeUK - it really depends on how mismatched things are - strictly speaking a balun is just a balanced to un-balanced device - but sometime it incorporates an impedance match at the same time
[20:38] <RocketBoy> only if ipedances are mis-matched will you get reflection - if you get reflection the balaun will help stop radiation from the transmission line
[20:39] <SpikeUK> Also true RocketBoy! But I think the OP was suggesting connection a Moxon directly to a random length of co-ax feeder
[20:39] <RocketBoy> for minor impedance mis-matched you arn't going to see a noicible difference in antenna gain
[20:42] <SpikeUK> You're right, but as you mentioned before, a correct match will minimize radiation from the transmission line
[20:42] <RocketBoy> what feed impedance are we talkng about?
[20:43] <SpikeUK> Not sure - I'll have a look
[20:48] <RocketBoy> or to put it another way - what is the design of balun we are thinking about missing out?
[20:48] <SpikeUK> Sorry RocketBoy - having trouble finding factual data. Looks like it was invented since all of my antenna books were published (end fed Zeppelin anyone ;-))
[20:50] <SpikeUK> Oh. http://www.moxonantennaproject.com/backround.htm suggests it's "a 50 ohm antenna, generating a near perfect 1:1 swr without requiring any additional matching".
[20:56] <SpikeUK> Bye! Be back later!
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[21:02] <ShellEvil> http://cgi.4chan.org/gif/src/1250218714374.gif completely offtopic - worksafe and :)
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[22:08] <Laurenceb> hello
[22:09] <SpeedEvil> hello
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[22:12] <Laurenceb> I think I've worked out a more sensible attitude control technique for two stage spin stabilised rockets
[22:12] <Laurenceb> you can use a foldable control moment gyro in the second stage nozzle
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[22:12] <Laurenceb> it takes two motors
[22:12] <SpeedEvil> hmm
[22:13] <Laurenceb> but its blown out by motor ignition so theres no complex high speed pyros - as with a blow off momentum wheel
[22:13] <SpeedEvil> interesting
[22:15] <Laurenceb> you can launch from a spinup mechanism on a HAB, and use rigging for elevation and a small fan or similar for azimuth
[22:16] <Laurenceb> then the sat ontop of the second stage deploys the fairing under ground control at ~150Km altitude, the second stage seperates using a spring, and the attitude control unit using a couple of thermopiles and a photodiode swings round the second stage ready for ignition at 200Km unit in the nozzle
[22:17] <Laurenceb> bleh - ignor the last bit
[22:17] <Laurenceb> I think it could be built for ~£200
[22:21] <SpeedEvil> http://bathsheba.com/math/klein/
[22:21] <SpeedEvil> sounds plausible.
[22:22] <Laurenceb> brb
[22:32] <Laurenceb> rjharrison_home: I might be avaliable this weekend
[22:32] <Laurenceb> for a "recovery effort"
[22:36] Action: SpeedEvil passes Laurenceb a long stick.
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[23:04] <DanielRichman> ping rjharrison_home
[23:13] <Laurenceb> http://bldc.wikidot.com/project-avr-esc
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[23:26] Action: Laurenceb is wondering if you could control two brushless motors with one micro
[23:29] <SpeedEvil> RTOS!
[23:29] <SpeedEvil> :)
[23:31] <Laurenceb> too much latency
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[00:00] --- Sat Aug 15 2009