highaltitude.log.20080911

[00:30] <RocketBoyv1> well sort of - generating the tones that should be generated by the TX
[00:30] <RocketBoyv1> but not a true test
[00:31] <RocketBoyv1> the real problem is the SSTV filter - quite narrow on FT790s - about 300 - 2.8Khz
[00:32] <RocketBoyv1> and SSTV signal is supposed to be wider than that - except the signal shaping Im using seems to keep it within 2.8KHz
[00:33] <RocketBoyv1> and the quaility is V.good - the transmitted and received picturs ar difficult to dinstinguish between
[00:33] <RocketBoyv1> across the table - noiseless
[00:49] <RocketBoyv1> night
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[03:58] <ShellEvil> Hello.
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[05:28] <ShellEvil> http://www.cyriak.co.uk/lhc/lhc-webcams.html :)
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[08:16] <jcoxon> morning all
[08:17] <gordonjcp> morning
[08:37] <rharrison> morning
[08:38] <jcoxon> morning
[08:38] <jcoxon> i've
[08:38] <jcoxon> hehe
[08:38] <jcoxon> oops
[08:38] <jcoxon> i've got my arduino mini - so small
[08:41] <rharrison> Woo. They do look small
[08:42] <rharrison> gordonjcp: Sorry to bug you so early on antennas but if I put a bit of coax cable in the circuit this does not count towards antenna length. This is after all how you boe the antenna away from the transmitter
[08:43] <rharrison> boe = move?
[08:43] <rharrison> Tx-SMA-COAX-Antenna
[08:44] <gordonjcp> more-or-less correct, yes
[08:44] <gordonjcp> if you're just using a 1/4w with a groundplane then use 50 ohm coax and don't worry about it
[08:44] Action: gordonjcp -> train
[08:44] <rharrison> Yep.
[08:45] <rharrison> Bye
[08:45] <gordonjcp> I'll be back in half an hour
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[09:25] <rharrison_quiet> edmoore off to post office now
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[10:43] <rharrison_quiet> edmoore: Parcel posted using standard parcel takes between one and three days. But typically one
[10:43] <rharrison_quiet> Parcel Force
[10:47] <rharrison_quiet> It in a big dell box but don't get excided there is no dell computer in there :)
[10:56] <edmoore> rharrison_quiet: thanks you!
[10:56] <edmoore> sorry was away earlier
[10:57] <edmoore> radiotimes seems to have got confused. http://www.radiotimes.com/ListingsServlet?event=10&channelId=105&programmeId=84312477&jspLocation=/jsp/prog_details_fullpage.jsp
[10:57] <edmoore> oh gosh I need to get on.
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[12:04] <edmoore> hi jcoxon
[12:05] <jcoxon> hey edmoore
[12:06] <edmoore> all well?
[12:07] <jcoxon> yuo
[12:07] <jcoxon> yup*
[12:07] <jcoxon> finally got my hands on my sparkfun order so am making my superbeacon
[12:07] <edmoore> awesome :)
[12:07] <edmoore> remind me what's in it?
[12:08] <jcoxon> at present as its a prototype:
[12:08] <jcoxon> Arduino Pro Mini
[12:08] <jcoxon> Circuit Design Radio 434.075
[12:08] <jcoxon> EM406a gps
[12:08] <edmoore> s/em406/lassen for the real thing?
[12:09] <jcoxon> indeed
[12:09] <jcoxon> i'll fly the em406 probably
[12:09] <jcoxon> but then swap it out when i have some cash
[12:12] <edmoore> :)
[12:12] <edmoore> i guess it will work just fine for the purpose intended anyway
[12:12] <jcoxon> yeah
[12:12] <jcoxon> hmmm i'm being sensible and are using sockets and headers
[12:12] <edmoore> so making a veroboard sheild for the arduino?
[12:13] <jcoxon> but it makes the arduino sit quite high up
[12:13] <edmoore> oh the *mini*
[12:13] <edmoore> sweeeeeeeeeeet
[12:13] <jcoxon> the veroboard is pretty large
[12:13] <jcoxon> perhaps a pcb for mkII
[12:13] <edmoore> you should wrap the whole thing in silicon foam, then space balnket, then heat shrink tube
[12:13] <edmoore> bomb proof
[12:14] <edmoore> just like we used to do for robot wars battery packs, minus the space blanket
[12:16] <jcoxon> this mini is mini
[12:18] <soneil> interesting, there's a high-altitude group on sparkfun's front page right now
[12:19] <jcoxon> yeah i saw that
[12:20] <edmoore> yes we've been in email contact with him
[12:20] <edmoore> one of sparkfun's employees at Colorado Uni is also electrical lead for that project
[12:20] <edmoore> he emailed out of the blue a couple of weeks ago
[12:21] <edmoore> lots of good stuff - the project report is quite neet
[12:21] <edmoore> not that ballooney as all that stuff is taken care of externally, their paylooad is litterally just the experiment
[12:42] <jcoxon> woohoo, its alive...
[12:47] <edmoore> how much of it?
[12:48] <jcoxon> oh i just powered up the arduino
[12:48] <jcoxon> thats all
[12:50] <edmoore> was about to say - that'd have been quick!
[12:53] <soneil> I had the previous variant of that, the "wee" .. they're great fun
[12:54] <soneil> 3.3v is much easier to reach with a lipo, and the thing's so small that you can't help but come up with more evil plans
[13:31] <rharrison_quiet> Book on antnenna has arrived. Ground Plane attenna are the first chapter, slight more exciting is that they reckon there is almost no difference beween 2 and 4 radials.
[13:32] <rharrison_quiet> Apprently it was motorola who knocked up the first GP antenna
[13:43] <rharrison_quiet> Ordered beacon stuff from farnell
[14:14] <edmoore> rharrison_quiet: grand
[14:14] <edmoore> interesting on the radials
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[18:44] <edmoore> ebening all
[18:45] <edmoore> jcoxon: you know arduinos. can you confirm that it would be able to manage both serial comms and 2 independant pwm channels?
[18:45] <jcoxon> hey ed
[18:46] <jcoxon> ummmm it should be able to
[18:46] <jcoxon> its a atmega168
[18:47] <edmoore> indeed, but I'd like to stick within the arduino environment if poss
[18:47] <edmoore> just to make life super-easy
[18:48] <jcoxon> i've defintitey done serial + one pwm channel
[18:48] <jcoxon> on the servo radio turner
[18:48] <jcoxon> tunner*
[18:50] <edmoore> indeed, that's what's attracted me
[18:50] <edmoore> it's time to do the bloody auto track yagi
[18:50] <edmoore> it's been bashed around for 2 years now
[18:51] <edmoore> and will keep it cheap and copyable so other people can knock things up that are similar
[18:51] <edmoore> same software, anyway
[18:54] <gordonjcp> hm
[18:54] <gordonjcp> I'm looking at some SPI-controllable synthesizers
[18:54] <edmoore> what sort of synthesis?
[18:54] <gordonjcp> just a PLL
[18:55] <gordonjcp> so I can generate the local oscillator for a simple fsk receiver
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[19:03] <edmoore> gordonjcp: do you understand antennas?
[19:03] <edmoore> in as much as anyone can...
[19:04] <gordonjcp> a bit, why?
[19:05] <edmoore> if the active element of the balloon tx is vertical, does the yagi want to be vertical or horizonal?
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[19:17] <gordonjcp> the yagi wants to be vertical too
[19:17] <gordonjcp> you probably want a vertically-polarised antenna for this
[19:18] <gordonjcp> incidentally, if the antenna is mounted so it's hanging down from the balloon with the ground plane at the top, that doesn't matter
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[19:28] <edmoore> oh?
[19:30] <gordonjcp> yeah
[19:30] <gordonjcp> it'll work just the same
[19:30] <gordonjcp> the radiation pattern will aim downwards but that's what you want
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[20:42] <robert1971> Quick question edmoore Should I keep the tx away from the atmega8 chip or are they ok nearish
[20:42] <edmoore> eeeeek
[20:43] <edmoore> the tx is basically bad news for your electronics
[20:43] <edmoore> so try and keep it all of the other side of the ground pane to the active element
[20:44] <edmoore> and ideally use some kind of emc shield - space balnket works for this
[20:46] <robert1971> Ok I mount the tx on top of the board and make the connetion to the active on the top too
[20:50] <edmoore> we tend to plonk the antenna on the end of some coaxial cable, and install it all outside the shielded warm box of electronics
[21:05] <robert1971> I'm on to it sir it just the connection to the sma on the pcb bit :)
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[23:44] <phatmonkey> hey jcoxon
[23:44] <jcoxon> hey phatmonkey
[23:44] <phatmonkey> i'm off to uni veeery soon, so money is bound to get tight
[23:44] <phatmonkey> can we sort out paying for the hosting?
[23:44] <jcoxon> paypal?
[23:45] <phatmonkey> yeah
[23:45] <jcoxon> email me and i'll sort it
[23:45] <phatmonkey> if everyone sticks in a quid a month or something, then we'll be sorted
[23:45] <phatmonkey> not sure how much "everyone" is though!
[23:46] <phatmonkey> ok, how about we call it a tenner a month, and divide that amongst anyone who wants to volunteer to help?
[23:49] <gordonjcp> how much hosting do you need?
[23:50] <phatmonkey> we already have hosting, but i'm paying for it, and i'm a poor student (ahem)
[23:50] <gordonjcp> ok
[23:51] <gordonjcp> I've got shitloads of space on togusa, you can have some for free
[23:51] Action: gordonjcp does a quick df -h
[23:51] <gordonjcp> yeah, loads
[23:51] <gordonjcp> well, 16G or so
[23:51] <phatmonkey> well jcoxon, to make it better value for money, I'd be very happy to set us up with a separate virtual server that can run tracking things and such
[23:51] <phatmonkey> ok
[23:52] <phatmonkey> thanks!
[23:52] <gordonjcp> pm me any contact details, details for webby stuff etc
[23:52] <edmoore> I don't mind contributing (though I am a poor student too!) but if the collective nowse allows cheaper solutions, that might be worth persuing
[23:53] <gordonjcp> well
[23:53] <phatmonkey> well I can go down in price
[23:53] <gordonjcp> I have this vps in Finland and I'm planning on swapping it all over to a hosted box in Holland
[23:53] <phatmonkey> i'm already paying for a dedicated server, and to be honest, I'm begging around for people to help pay...
[23:53] <gordonjcp> it's fairly lightly loaded, and has a fair bit of free disk space
[23:56] <edmoore> if you need to keep the box anyway,
[23:56] <edmoore> (phatmonkey)
[23:56] <edmoore> then I can contribute something
[23:57] <phatmonkey> thanks ed
[23:57] <edmoore> we should google adds the wiki :)
[23:57] <phatmonkey> I really don't expect much
[23:57] <phatmonkey> oh that's a thought...
[23:57] <edmoore> it pays for james's hosting, he says, though that's not a whole box obviously
[23:57] <phatmonkey> well, we get almost literally no traffic (jcoxon, you have the stats?), so i'm not sure how well that'd work
[23:57] <phatmonkey> ok
[23:58] <edmoore> but if we put all our payload tech info on the wiki, then every launch, when we get pushed round the news sites, we can link to the wiki. that might help
[23:58] <edmoore> jcoxon: ping
[23:58] <jcoxon> i think its probably worth it
[23:58] <jcoxon> and yeah if we always link to it
[23:58] <phatmonkey> yeah alright
[23:59] <jcoxon> phatmonkey, i'm quite happy with you hosting, its been very reliable
[23:59] <jcoxon> lets say ?10 a month which will probably end up being ?1 each or so
[23:59] <edmoore> I will pay 1 year up front
[23:59] <edmoore> 's a lot easier
[00:00] --- Fri Sep 12 2008