highaltitude.log.20100612

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[09:05] <fsphil> any launches this weekend?
[09:11] <earthshine> morning
[09:12] <juxta> hey earthshine
[09:12] <juxta> do you have any fsa03's in stock?
[09:12] <earthshine> sure do
[09:12] <juxta> how much are they?
[09:12] <earthshine> http://www.earthshineelectronics.com/search.php?orderby=position&orderway=desc&search_query=fsa&submit_search=Search
[09:13] <earthshine> oops
[09:13] <earthshine> http://www.earthshineelectronics.com/27-falcom-fsa03-gps-module-with-smart-antenna.html
[09:13] <earthshine> £34.99
[09:13] <juxta> awesome - what sort of postage do you do?
[09:14] <juxta> anything that'll get to aus quickish? :)
[09:14] <earthshine> anything you like
[09:14] <earthshine> i normally send them first class standard
[09:14] <juxta> oh right
[09:14] <juxta> hmm
[09:15] <juxta> any idea what it'd cost with dhl or similar earthshine?
[09:16] <earthshine> a lot
[09:17] <earthshine> if you want it quickly i could do ROyal Mail Airsure
[09:17] <juxta> wow, I just ran it on the UK DHL website - 60 pounds for a 100gram parcel 5cm x 5cm x 5cm
[09:17] <earthshine> takes 2-4 days
[09:17] <juxta> oh that's perferct
[09:17] <juxta> not too expensive?
[09:17] <earthshine> if you want it a bit ceaper there is airmail which is 305 working days
[09:18] <earthshine> let me see
[09:18] <juxta> i'll get 2 modules earthshine
[09:18] <juxta> which is guess is a total of about 50 grams :)
[09:19] <earthshine> £1.31 for standard postage to Oz
[09:19] <earthshine> with airsure it adds £4.90
[09:19] <juxta> that's no worries at all
[09:19] <juxta> ok, shall i put the order in through your site?
[09:19] <earthshine> let me make you a money off voucher
[09:19] <earthshine> cheaper for HAB guys
[09:20] <juxta> oh thanks :D
[09:20] <juxta> you dont happen to have NTX2's too, do you?
[09:21] <earthshine> Sorry no
[09:21] <juxta> no worries
[09:25] <fsphil> oh earthshine, did I remember you talking about making a breakout board for the fsa03?
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[10:37] <rjharrison> Yawn... Revision
[10:38] <rjharrison> junderwood do you have a launch planned?
[10:43] <fsphil> revision?
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[11:49] <earthshine> fsphil: Yes eventually
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[12:35] <fsphil> good good, cause my pcb making skills are not exactly top notch :)
[12:38] <fsphil> I suppose I could just solder some wires to the terminals anyway, at least in the prototype
[12:39] <earthshine> yeah i did that
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[12:48] <junderwood> rjharrison, launch planned in a few weeks. I'll let everyone know a little closer to the time. Depends on school exams (not me!)
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[14:40] <cuddykid> Hi guys! Just a quick newbie question! .. Got arduino and interfaced it successfully with NTX2, broadcasting "hello world" and decoding on computer! (very pleased!!) .. doing some additional coding now for arduino and I was just wondering whether there is a shorcut to the following problem: a section of code i'm using is [code] rtty_txstring("Running time: "); //Output "Running time: "
[14:40] <cuddykid> rtty_txstring(rt_array); //Output string that's been converted
[14:40] <cuddykid> rtty_txstring(". "); // Output fullstop [/code] ..... I was wondering if theres a way just to have one rtty_txstring(_______) and inside the brackets to have the fixed "Running time:" etc and the variable? thanks
[14:41] <DanielRichman> cuddykid, snprintf
[14:42] <DanielRichman> basically
[14:42] <DanielRichman> char buffer[30];
[14:42] <DanielRichman> snprintf(buffer, sizeof(buffer), "Running time: %i\n", running_time_integer);
[14:42] <DanielRichman> rtty_txstring(buffer);
[14:42] <DanielRichman> beware of memory usage, shouldn't really be a problem though
[14:43] <cuddykid> ok, i see! that should be a bit neater than putting rtty_txstring everywhere!
[14:43] <cuddykid> thanks
[14:43] <DanielRichman> cuddykid, snprintf *will* chew up a lot of ROM. The printf family is quite large
[14:43] <DanielRichman> and buffer will use up a portion of RAM (on the stack, typically)
[14:44] <cuddykid> btw, i managed to get it decoding properly after i switch from the shift 450 (or something!) to shift 850
[14:44] <cuddykid> ok
[14:44] <DanielRichman> you might want to try and tweak it so that the shift is exactly 425
[14:44] <cuddykid> yeah, is it my resistor values for pot divider which are out?
[14:44] <DanielRichman> I'm not sure why using our resistor values doesn't result in that; I checked our board - it's right besides me - and those are the values we used and it produces a nice shift
[14:45] <cuddykid> No, I didn't follow them exactly as I didn't have the exact values, so that'll be why!
[14:45] <DanielRichman> cuddykid, you could grab a multimeter, and then slow rtty_txbit down to wait like one second for each bit so you can get a good look at the two voltages it's producing
[14:45] <cuddykid> I'll grab some of your values and replace them
[14:45] <DanielRichman> oh I see cuddykid. The values I gave to you can be created using E12 (standard) values
[14:45] <DanielRichman> (slowing rtty_txbit down will break the decoding but simply let you get a good look at the voltages)
[14:45] <cuddykid> ok! will grab some of them when in maplin later! I think i'm using E3s atm :/
[14:46] <cuddykid> i see, good idea
[14:46] <DanielRichman> you can combine several resistors in series
[14:46] <DanielRichman> to build up the values, if you want
[14:46] <DanielRichman> cuddykid, how different are the values that you are using?
[14:46] <cuddykid> thats what i'm doing atm, but they're still not overall the exact same values as yours, but close
[14:46] <cuddykid> i think they're about 0.3kohms out
[14:47] <DanielRichman> hmmmm
[14:47] <cuddykid> i can't remember, i'll have another look at the board in a bit
[14:47] <DanielRichman> well you could just get a potentiometer
[14:47] <DanielRichman> well... three
[14:47] <cuddykid> but its not widely out
[14:47] <DanielRichman> and tweak the values
[14:47] <DanielRichman> but it's a bit of a pain to have to tweak three pots continuously
[14:47] <cuddykid> yes, i'll have a look in maplin!
[14:47] <DanielRichman> cool
[14:47] <cuddykid> also..
[14:48] <cuddykid> i'm using lassen iq
[14:48] <cuddykid> i'm awaiting the correct antenna atm as they sent me the wrong one! Will it work without antenna so I could do some testing?
[14:48] <DanielRichman> nope. It will probably never get a fix w/o antenna
[14:48] <cuddykid> even if it doesn't get an accurate fix
[14:48] <cuddykid> ok
[14:49] <DanielRichman> cuddykid, PS you could get some multi-turn potentiometers to make it easier
[14:49] <cuddykid> i'll chase them up on the antenna
[14:49] <cuddykid> ok, thanks
[14:50] <cuddykid> did some range testing yesterday, and managed to get fantastic range using just whip antenna and a piece of wire attached to NTX2, was amazed! around 2/3 miles, some open ground and through a few houses!
[14:50] <DanielRichman> cool
[14:52] <cuddykid> yagi arrived yesterday but need to get some connectors for it to work with yaesu, would adding a couple of meters of extension cable (as cable atm is very small) affect the gain/signal much?
[14:52] <DanielRichman> co-ax?
[14:52] <cuddykid> urm, i was just going to get sma to sma extension as the yagi output is sma :S
[14:53] <DanielRichman> hmm that will be coax then
[14:53] <DanielRichman> should be fine
[14:53] <cuddykid> ok, great!
[14:54] <cuddykid> thanks for the help
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[17:12] <cuddykid> what code needs to be sent in order to start a new line in fldigi?
[17:13] <sbasuita> cuddykid: \n
[17:13] <cuddykid> sbasuita: thanks
[17:14] <fsphil> and if that doesn't work, \r
[17:15] <cuddykid> ok :)
[17:15] <sbasuita> well you either send \n or \n\r for newline
[17:15] <sbasuita> surely not \r by itself?
[17:15] <sbasuita> oops its \r\n ;P
[17:15] <fsphil> I did lol, seemed to work. I'm really not sure though
[17:15] <fsphil> I guess fldigi is forgiving
[17:15] <sbasuita> yeah
[17:18] <cuddykid> brilliant, /n is working !
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[18:06] <sbasuita> hmm...
[18:06] <sbasuita> griffonbot isn't working
[18:06] <sbasuita> can't see why... its got a tcp connection with twitter and the log is boring
[18:06] <sbasuita> i'll restart it
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[18:08] Action: griffonbot is GriffonBot [http://github.com/ssb/griffonbot]
[18:08] Action: griffonbot is following: #ukhas #arhab #cusf
[18:09] <griffonbot> @griffonbot: #ukhas testing bot [http://twitter.com/griffonbot/status/16016350763]
[18:09] <sbasuita> *shrug*
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[18:14] <fsphil> just lazy?
[18:14] <sbasuita> yeah maybe it got bored
[18:14] <fsphil> of watching the football
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[20:47] <jcoxon> evening all
[20:52] <jcoxon> seems like wb8elk has launched
[20:52] <jcoxon> is on spacenear.us
[21:16] <Hiena> Groan. Why the space business is ful with crooks?
[21:16] <jcoxon> Hiena, cause its based upon plans and ideas rather than things
[21:16] <SpeedEvil> Because the government is pumping money into it?
[21:17] <Hiena> Now just a new hungarian team started to "Winning the GLX prize" campaign.
[21:18] <Hiena> 2 year until the deadline. And i hardly belives they had enough money to buy even a free soda for a team.
[21:18] <SpeedEvil> I have _way_ more time for that than governmental space in general.
[21:18] <Hiena> But they states on they "blog", they have the "grey matter" for the win,
[21:19] <Hiena> This level stupidity is pain for me.
[21:20] <Hiena> The cheapest commercial GEO launch is around 90 million USD.
[21:21] <SpeedEvil> Oh
[21:21] <SpeedEvil> I was thinking it was something rather lighter.
[21:22] <SpeedEvil> A lunar rover mission is a bit ambitious.
[21:23] <SpeedEvil> LEO on a comparably small budget is not completely impractical.
[21:23] <Hiena> SpeedEvil, that is the lighter one. If you want to land on the moon, you have to lift at least 1 tons to GEO.
[21:23] <SpeedEvil> But the moon then is pretty much as hard as starting again.
[21:23] <SpeedEvil> I somewhat question that.
[21:24] <Hiena> For that the cheapest option the Zenit2SL launch. You could get some legroom (around 800kg).
[21:24] <SpeedEvil> But yes, it's about that order.
[21:24] <SpeedEvil> As in I think you can do it substantially under a ton
[21:24] <SpeedEvil> not under 100kg though
[21:25] <Hiena> SpeedEvil, you need a lander, rover, telemetry and not a hobby grade, it must to be aerospace grade.
[21:26] <Hiena> Also need a plenty of fuel, solar panels, engines for the orbital unit.
[21:27] <SpeedEvil> Indeed.
[21:28] <Hiena> You could cut the orbital unit and the lander and it's fuel, but that case the payload should be strong enough to survive a head first impact, and a high power telemetry.
[21:28] <SpeedEvil> Compromises.
[21:29] <SpeedEvil> It gets a whole heap easier if you can get a few hours of testing in LEO. :)
[21:32] <Hiena> So, imagine lot of engineering without money.
[21:32] <SpeedEvil> Indeed. It's a _HUGE_ project.
[21:32] <SpeedEvil> Starting with a huge vacuum chamber for testing.
[21:32] <SpeedEvil> Some aspects have gotten easier.
[21:33] <SpeedEvil> Computer power is orders of magnitude cheaper, sensors are much smaller, and lighter.
[21:33] <Hiena> Btw, if you ever got an offer for a "cheap" or "free" stainless steel sheets, say it no.
[21:33] <SpeedEvil> You can trade smarts for budget - if and only if you're doing things in a radically different way
[21:34] <SpeedEvil> Some wierd alloy?
[21:35] <Hiena> Weird? It's harder than my most drill, and burn to sponge, when i touch with the torch.
[21:35] <SpeedEvil> :)
[21:35] <SpeedEvil> You do know that you need to feed _really_ aggressively with most sorts of stainless
[21:36] <SpeedEvil> For drilling
[21:36] <Hiena> Not to mention, it cracks when i bend it, even with the bigger radiuses.
[21:37] <Hiena> I know it. I worked with plenty of stainless material, but it's simply out of my legau.
[21:37] <Hiena> It would be perfect material for the combustion chambers, but impossible to work with it.
[21:38] <SpeedEvil> You know the alloy - or is it random
[21:40] <Hiena> Dunno. I'll phone the guy, who sold it. But i guess, he had a similar reason, why he sold me that.
[21:42] <Hiena> According the color and the sound it could be somekind mixed alloy. The sponge effect says me, it has some light metal (magnesium, nickel or aluminium) in it.
[21:42] <Hiena> The hardness and the color hints chrome and cadmium.
[21:42] Action: SpeedEvil wishes for a mass spectrograph.
[21:46] Action: Hiena wishes a few hundred million dollar budget.
[21:47] <SpeedEvil> That too. :)
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[22:01] <Hiena> An another thing. If you have some spare time to thikering, try the Linde cooling method. It's really funny. With a cheap 10 atm compressor, possible to go under -70 within a minutes.
[22:01] <SpeedEvil> yeah - heard that.
[22:01] <SpeedEvil> Don't have compressor alas.
[22:02] <Hiena> Only two extra heat exchanger needs, and some plumbing.
[22:02] <SpeedEvil> Been trimming hedge, and chipping it through a trimmer.
[22:02] <SpeedEvil> http://www.flickr.com/photos/14560445@N08/4693091125/
[22:02] <SpeedEvil> fun
[22:02] <SpeedEvil> I wish small heat pumps were easily available.
[22:02] <SpeedEvil> I'd love a ~1kW(e) water-water heatpump
[22:03] <rjharrison> jcoxon, nice launch by bill
[22:03] <SpeedEvil> :)
[22:03] <rjharrison> Seems to have lost data at 29k
[22:04] <jcoxon> rjharrison, they seem to have had issues with corrupt rx data
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[00:00] --- Sun Jun 13 2010