highaltitude.log.20090421

[00:00] Action: natrium42 changes tuners
[00:01] <jcoxon> nah its not that
[00:01] <jcoxon> good
[00:01] <natrium42> haha, voice?
[00:03] <jcoxon> it didn't decode that well
[00:05] <jcoxon> okay going for my last sentence
[00:05] <jcoxon> then i'm done for now
[00:05] <jcoxon> someone else will need to take over
[00:12] <SpeedEvil> sparkfun question - hoe do you resurrect an inactuve forum account
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[00:20] <jcoxon> night all
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[02:49] <Dan-K2VOL> Hello ballonists
[02:51] <shellevil> hello
[02:52] <Dan-K2VOL> Hi Shell
[02:52] <Dan-K2VOL> how's things
[02:52] <Dan-K2VOL> that PBH9 just keeps on trucking, I really want to know the details on that
[02:53] <shellevil> dunno
[02:53] <shellevil> there isn't a website, so ...
[02:53] <Dan-K2VOL> have any of you guys been able to hear it?
[02:58] <shellevil> not me
[02:58] <shellevil> jcoxon I think got some
[03:02] <Dan-K2VOL> ncie
[03:02] <Dan-K2VOL> nice
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[07:11] <jcoxon> morning
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[07:32] <jcoxon> morning edmoore
[07:33] <edmoore> morning jcoxon
[07:33] <edmoore> how's the balloon?
[07:34] <jcoxon> they reckon its down
[07:34] <edmoore> all the way down?
[07:34] <jcoxon> wb8elk got the last string at 03:10UTC
[07:34] <edmoore> how big was she anyway?
[07:34] <jcoxon> big
[07:35] <jcoxon> i'm not sure the size
[07:35] <jcoxon> they are a little mean by not giving much details
[07:35] <edmoore> 'pure monty python' interview on radio4 currently
[07:35] <edmoore> interviewing about this bee research
[07:35] <edmoore> all you can hear are thousands of bees buzzing around the mic
[07:36] <edmoore> and some poor guy trying to talk about this research grant faintly beneath them
[07:37] <jcoxon> hehe
[07:37] <jcoxon> PBH guys now have 2 records
[07:37] <jcoxon> need to sort that out really
[07:37] <jcoxon> they can't have 2!
[07:38] <edmoore> for some value of 'amateur' (bee in bonnet about this, sorry)
[07:38] <edmoore> but yes, the alt one is there for the taking
[07:39] <edmoore> getting a big ZP probably relies on the fact that your employer is the largest aerospace company in the world
[07:39] <jcoxon> yeah
[07:39] <jcoxon> my little bee is that they don't really embrace other people
[07:39] <edmoore> yes, they do seem to be a bit of a black box
[07:40] <jcoxon> its difficult to get involved,just an email address you post to
[07:40] <edmoore> silly slashdot comment - 'an unmanned balloon is surely just an oon'
[07:40] <jcoxon> yes without WB8ELK they would have no clue where that balloon was for the past 24hrs
[07:42] <edmoore> and u
[07:42] <edmoore> i would quite like to make the engineering department a radio shack
[07:42] <edmoore> such a good position
[07:43] <jcoxon> :-)
[07:44] <edmoore> ok, going to have some brek and do exam number 3
[07:44] <jcoxon> okay good luck
[07:45] <edmoore> ta
[07:45] <edmoore> nothing till thursday after this one, which is nice
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[10:27] <rjharrison> Ping Laurenceb
[11:05] <Laurenceb> hi
[11:05] <Laurenceb> rjharrison: pong
[11:15] <rjharrison> Boo
[11:15] <rjharrison> Quick question Laurenceb
[11:16] <rjharrison> When using SMA resistors what watt value do you tend to go for?
[11:16] <rjharrison> 0.2?
[11:16] <rjharrison> or 0.1?
[11:22] <Laurenceb> I go for size
[11:22] <Laurenceb> never really bother about wattage
[11:23] <Laurenceb> 1206 or 603
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[11:23] <rjharrison> Ok thanks for that
[11:24] <edmoore> mornin all
[11:25] <Laurenceb> if your in danger of overheating the resistor your doing it wrong
[11:25] <Laurenceb> hi
[11:26] <edmoore> what's the resistor issue?
[11:27] <Laurenceb> rjharrison whats to know all about smd :P
[11:27] <edmoore> it's the future
[11:27] <edmoore> and has been since 1980
[11:27] <Laurenceb> I'd say 1206 if you have space
[11:28] <Laurenceb> 0603 if you want to make it smaller
[11:28] <edmoore> 0603 is more standard though
[11:28] <edmoore> in that everyone and their mums stocks them
[11:39] <edmoore> Laurenceb: what's the latest on the "amateur" balloon?
[11:42] <Laurenceb> they think it landed in the sea overnight
[11:42] <Laurenceb> they didnt have any ballast control
[11:46] <gordonjcp> I didn't hear anything from it
[11:46] <edmoore> you need ballast control
[11:46] <edmoore> otherwise you can't eat safely
[11:49] <Laurenceb> http://diydrones.com/
[11:49] <Laurenceb> ^ theres so interesting stuff going on over there
[11:52] <edmoore> yes, i check it almost daily
[11:53] <Laurenceb> it used to be a bit noobish
[11:53] <Laurenceb> but they've got some decent hardware coming together now
[11:54] <Laurenceb> the uavdevboard code looks interesting
[11:54] <edmoore> the uavdevboard is exciting
[11:54] <Laurenceb> :P
[11:54] <edmoore> the ardupilot board is just really abreakout board for at atmega
[11:54] <edmoore> the code is the project, rather than the hardware, for the ardupilot
[11:55] <Laurenceb> using speed and rate of turn to correct the accels looks like a plan
[11:55] <Laurenceb> unfortunately it only works perfectly if you have zero windspeed
[11:55] <Laurenceb> a pitot tube might help them
[11:56] <Laurenceb> also they should ditch the sirf3 and use a ublox
[11:57] <Laurenceb> unfortunately gusty wind will still tend to screw up accels - maybe its possible to have a forward model for windspeed
[11:58] <edmoore> definitely agreed with ublox
[11:58] <Laurenceb> if you have a ublox and pitot tube its probably possible
[11:58] <edmoore> the em406 takes about 12 seconds to register a turn
[11:58] <Laurenceb> treat wind as having a constant heading and variable speed
[12:00] <Laurenceb> the thing they missed is if you use gyros and ground speed it only works if the wind=0
[12:00] <Laurenceb> you need gyros and airspeed
[12:00] <Laurenceb> to find the accel in a turn - either that or x product of last two gps vel vectors
[12:01] <Laurenceb> oh well gtg, cya
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[13:21] <rjharrison> Being a bit thick here but 0603 all fit the same SMB footprint
[13:22] <rjharrison> SMD even
[13:38] Action: shellevil ponders surface mounted banannas.
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[15:14] <edmoore> hi jcoxon
[15:14] <edmoore> definitely down?
[15:26] <jcoxon> that i can't answer
[15:26] <jcoxon> no one has heard for quite a bit
[15:26] <jcoxon> most likely its gone
[15:29] <jcoxon> exam done?
[15:29] <A-> does anyone know of some open python code for parsing aprs packets?
[15:32] <jcoxon> A-, not off the top of my head/quick google search
[15:33] <jcoxon> there is a perl module for parseing aprs
[15:33] <A-> using a gumstix for a HAB project, and have almost everything else I need written in python
[15:33] <jcoxon> oh right
[15:33] <jcoxon> ummmm i don't think there is
[15:33] <jcoxon> where abouts are you launching? US?
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[15:34] <A-> well if I come up with anything decently portable I'll make sure to put it up in a repository
[15:34] <A-> Utah
[15:34] <A-> http://space.weber.edu/harbor/
[15:34] <jcoxon> ooo cool
[15:35] <A-> so far we've used two microtrak 8000's, but we should have a full gumstix flight computer ready for this summer's flight season
[15:36] <jcoxon> how are you connecting the gumstix to your radio? audio out?
[15:36] <A-> tracker 2 tnc
[15:36] <A-> to a yaesu vx-6r
[15:37] <jcoxon> oh cool
[15:37] <A-> is the current gear, trying to talk my advisor into getting us one of these guys: https://www.argentdata.com/catalog/product_info.php?products_id=112
[15:38] <jcoxon> :-D
[15:39] <jcoxon> nice
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[15:43] <edmoore> jcoxon: yes exam done, ta
[15:45] <edmoore> hallam: what subset of numbers have the PRN autocorrelative properties, given a set of 2^n binary numbers?
[15:45] <jcoxon> excellent
[15:46] <edmoore> or is it just a range of autocorrelative profiles for a given set and you pick the best?
[15:47] <shellevil> edmoore: I vaguely recall tere is an actual term for them.
[15:48] <shellevil> codes with zero correlation with other codes in a family that is.
[15:48] <edmoore> or zero autocorrelation for non-sero offsets
[15:49] <edmoore> zero-ish
[15:49] <edmoore> i think a set of codes with zero crosscorrelation are just called orthogonal, aren't they?
[15:50] <shellevil> It's been a while.
[15:50] <shellevil> And I try to block out some of my maths courses, or I run screaming from rooms :)
[15:51] <shellevil> partial integration for example - I never got past the 'suddenly a result appears' first step.
[15:51] <edmoore> :)
[16:03] <jcoxon> PBH have got their records
[16:03] <jcoxon> 1st for flight duration 49h45m
[16:04] <jcoxon> 2nd for flight distance 1,965mi
[16:04] <jcoxon> and 2nd for distance of comms below 50Mhz
[16:13] <shellevil> Sigh.
[16:13] <shellevil> Boring shit.
[16:13] <shellevil> Note to self.
[16:13] <shellevil> Don't discuss how to do RAID on a network which your un-RAIDed server can snoop.
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[16:14] Action: shellevil is doing the backup failing disk dance.
[16:16] <jcoxon> shellevil, :-)
[16:16] <edmoore> i think we should go and work for boeng
[16:16] <edmoore> then ask them to fund our after-hours projects
[16:16] <edmoore> and also give us leave from work to actually do them
[16:16] <jcoxon> edmoore, i'm loving this Bee
[16:16] <edmoore> and also have them support is financially whilst we do it
[16:16] <jcoxon> someone should smash teh altitude record
[16:17] <edmoore> and then also have them release press releases about how their people are doing it
[16:17] <jcoxon> i reckon they'll go tran-a next to complete the set
[16:17] <edmoore> bit still we'd be amateurs
[16:17] <edmoore> that has to be done... and soon
[16:17] <edmoore> not by them
[16:18] <edmoore> james definitely do it
[16:18] <jcoxon> trans-a?
[16:18] <jcoxon> i'm working on it
[16:18] <edmoore> yes
[16:18] <edmoore> it has to be done
[16:18] <jcoxon> just got to fail my arabic exam first and pass my 5th year medicine
[16:19] <jcoxon> both of which are going to plan
[16:19] <jcoxon> :-p
[16:21] <shellevil> arabic?
[16:21] <shellevil> Any other languages?
[16:21] <edmoore> bloody hell!
[16:21] <edmoore> they're not bloody amatuers
[16:21] <jcoxon> i'm stupidly learning arabic as one of my special modules - stupid idea as i'm rubbish at languages
[16:22] <shellevil> jcoxon: Ah.
[16:22] <jcoxon> i forgot how bad i was - hated french, show how 9 years later it seemed like a good idea
[16:22] <jcoxon> edmoore, explain...
[16:23] <edmoore> just the bee buzzing a little more
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[16:24] <jcoxon> they are amateur radio users
[16:24] <edmoore> that is true, i suppose
[16:24] <edmoore> they could be a bit more open about it though too, in the spirit of amateur radio
[16:24] <jcoxon> oh completely
[16:25] <jcoxon> especially as it was everyone else who was doing the tracking work once APRS ran out
[16:27] Action: sbasuita realises that bracknell radio club is only 500m from his house
[16:30] <sbasuita> Well, 1km by road ;)
[16:32] <jcoxon> hehe
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[16:35] <edmoore> sbasuita: so you have no excuse not to get a license now
[16:35] <sbasuita> edmoore, indeeed
[16:36] <sbasuita> Though they only meet once a month
[16:36] <edmoore> they probably can do course as and when
[16:36] <edmoore> worth an ask anyway
[16:36] <sbasuita> Yep
[16:36] <sbasuita> Looking for a phone number
[16:37] <sbasuita> Their site isn't very helpful tbh
[16:40] <sbasuita> "We will be running more courses and examinations in May. For further information please contact . "
[16:40] <sbasuita> This is hopeless...
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[17:08] <hallam> edmoore: you want a Gold code
[17:08] <edmoore> Gold!
[17:08] <edmoore> (gold)
[17:08] <edmoore> always beleiving in gooold
[17:09] <hallam> exactly
[17:09] <sbasuita> What do you guys think about http://www.universal-radio.com/CATALOG/fm_txvrs/3780.html for an entry level transceiver?
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[17:11] <gordonjcp> seems okay
[17:11] <gordonjcp> The FT-7800R features Yaesu's ARTS" Auto-Range Transponder System, important in search-and-rescue applications
[17:11] <sbasuita> *shrug*
[17:11] <gordonjcp> ^ wow, I can see *that* being *really* useful
[17:11] <sbasuita> Well, I looked at dual-band stuff from the other major manufacturers
[17:11] <gordonjcp> depends what you want to do
[17:11] <sbasuita> that ft-7800r seems to be the cheapest with the most features
[17:13] <hallam> sbasuita: what do you plan on using it for?
[17:14] <sbasuita> Just voice stuff
[17:14] <sbasuita> Hmm
[17:14] <sbasuita> wonder if it does SSB
[17:14] <edmoore> not ballooning?
[17:14] <sbasuita> need that for 70cm ballooning
[17:14] <sbasuita> yes ballooning as well
[17:14] <hallam> it doesn't look like it would be useful for a HAB ground station, at least not with the transmitters we've been using so far
[17:14] <hallam> no SSB
[17:14] <edmoore> i was just checking the ssb myself - can't see it mentioned
[17:15] <sbasuita> Shame
[17:15] <shellevil> ssb is a nice cheap output to soundcard
[17:15] <sbasuita> Which bands are generally used for what?
[17:15] <shellevil> used for digital radio
[17:15] <edmoore> the ft-817 may scare a bit but it is a good radio
[17:15] <hallam> oh, you get lots of different modes on lots of different bands
[17:15] <sbasuita> Which bands do I want to get then =/
[17:16] <edmoore> if you get a license, you'll have bands open to you from 136khz to several Ghz
[17:16] <hallam> for ballooning, you need somethign that will receive SSB on 70cm (434MHz)
[17:17] <sbasuita> yep
[17:17] <hallam> you can probably get a handheld scanner that will do that for <100GBP
[17:17] <hallam> if you want nice performance, fancy features etc.. have to spend more
[17:17] <sbasuita> not really into fancy features as such
[17:17] <sbasuita> ; )
[17:18] <gordonjcp> hallam: scanners with ssb seem a bit hard to find
[17:19] <hallam> yeah, the bottom-end ones don't have it, but they do exist
[17:21] <sbasuita> Are there any "Foundation License Course for Dummies" books or similar out there?
[17:21] <hallam> yes
[17:21] <hallam> your club probably has them
[17:21] <hallam> ours did
[17:21] <hallam> maybe on the rsgb website also?
[17:22] <hallam> that said, foundation license pretty much consists of "do you have a pulse?"
[17:22] <sbasuita> gotcha
[17:22] <sbasuita> ft-817
[17:22] <sbasuita> damn copypastefail
[17:22] <sbasuita> http://www.rsgbshop.org/acatalog/Online_Catalogue_Training_19.html
[17:24] <hallam> yeah those are the ones
[17:25] <DanielRichman> What license levels do you have? ie Foundation Intermediate etc...
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[17:27] <hallam> advanced
[17:28] <DanielRichman> Do you get access to more bands than intermediate?
[17:30] <hallam> good question
[17:30] <hallam> I think all licences get all bands, int and full just increase your power limits
[17:30] <hallam> and let you operate overseas
[17:31] <hallam> and if you want to get a notice of variation (e.g. for an airborne transmitter), they'll take you more seriously if you have full
[17:32] <jcoxon> hallam, have you guys got your NOV yet?
[17:34] <gordonjcp> hallam: no, int and full get more microwave bands
[17:38] <hallam> jcoxon: haven't even asked yet
[17:38] <jcoxon> oh okay
[17:38] <hallam> gordonjcp: cool. I really want to try some microwave stuff
[17:42] <sbasuita> Oooh
[17:42] Action: sbasuita got 20/25 on a foundation sample test
[17:42] <sbasuita> ; )
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[17:49] <edmoore> gordonjcp / hallam am I right in thinking foundation doesn't have access to 126khz?
[17:49] <edmoore> (not that they'd probably loose much sleep over that)
[17:51] <gordonjcp> edmoore: 136kHz you do, but you'd need to build a commercial kit transceiver ;-)
[17:51] <edmoore> what a waste
[17:51] <edmoore> you could drive it straight with the DAC of a micro :)
[17:52] <edmoore> i'd love to try that on a balloon
[17:52] <edmoore> it would propagate forever, and you could almost make a complete dipole
[17:52] <gordonjcp> haha
[17:52] <gordonjcp> 136kHz j-pole
[17:52] <edmoore> you would probably straddle about 5 electricity pylones on landing though
[17:53] <gordonjcp> the long leg of a j-pole would be 1600m ;-)
[17:53] <edmoore> indeed
[17:53] <edmoore> lets do it
[17:54] <edmoore> ditch it into the sea
[17:54] <edmoore> get 1.6km of very fine wire
[17:54] <edmoore> easy
[17:54] <edmoore> well, more than that....
[17:54] <gordonjcp> a mile long antenna
[17:55] <edmoore> it would be a fun experiment to try
[17:56] <edmoore> would could easily accomodate a launch here
[17:56] <edmoore> out of the window now i see 400m of playing fields until you get to the tree line at the end of college
[17:56] <jcoxon> you could hold on for quite a bit of the flight
[17:56] <jcoxon> and let go when it was 1.6km up
[17:56] <jcoxon> :-p
[17:56] <edmoore> i think i'd just want to let it go
[17:57] <edmoore> can use a tethered balloon at 200m + some electrical ballast to be the reciveing vertical
[17:57] <edmoore> with radials out on the playing fields
[17:58] <shellevil> I've pondered a little blimp.
[17:59] <shellevil> powered from the ground
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[18:01] <shellevil> Long fishing line as the tensile element - there are some 2GPa+ ones - couple of wires secured to it taking a couple of hundred volts at an amp or so up to the top, for 100W at the top.
[18:01] <shellevil> aluminium wire
[18:03] <gordonjcp> I thought about a balloon-flown wireless AP years ago
[18:04] <edmoore> AP?
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[18:05] <sbasuita> edmoore, access point
[18:05] <sbasuita> (for networking)
[18:05] <edmoore> ah ok
[18:06] <edmoore> bbiab
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[18:06] <shellevil> The above thought was for a webcamaerostat.
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[18:07] <shellevil> a shaped aerostat anchored at the bottom, designed as a lifting body in wind, wth some guy ropes might also work
[18:07] <shellevil> I don't know how to design that though
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[18:47] <sbasuita> I assume fldigi can decode morse?
[18:52] <natrium42> yep
[18:56] <sbasuita> natrium42, got any links to a quick setup guide
[18:56] <sbasuita> ?
[18:57] <natrium42> or what?
[18:57] <natrium42> for*
[18:57] <sbasuita> natrium42, what mode should i put fldigi in to do morse?
[18:58] <natrium42> Op Mode ->CW
[18:58] <sbasuita> just as i suspected ;)
[18:58] <natrium42> CW is contiunous wave
[18:58] <natrium42> :)
[18:58] Action: sbasuita grabs a 3.5<->3.5 cable
[19:02] Action: sbasuita is listening for the repeater callsign
[19:02] <sbasuita> shame the 790r doesn't have an option to enable its speaker when you have spkr out plugged in
[19:03] <natrium42> should be able to make the computer output it
[19:04] <sbasuita> not wihtout my 3.5mm cable to my speakers
[19:04] <sbasuita> ; )
[19:04] <natrium42> dunno, i have a setting in the sound control to enable it :P
[19:05] <sbasuita> "II * S**SSS* SH E* "
[19:05] <sbasuita> got knows what that means
[19:05] <sbasuita> do I have to do anything other than put it in CW mode?
[19:05] <natrium42> white noise
[19:05] <sbasuita> it wasn't white noise
[19:05] <sbasuita> it printed nothing when there was noise
[19:05] <natrium42> adjust the squelch so that it ignores noise
[19:05] <sbasuita> when the busy light came on the transceiver it printed that
[19:05] <sbasuita> already have
[19:06] <sbasuita> do i need to do anything with the waterfall thingy?
[19:06] <shellevil> it can be noise
[19:06] <shellevil> noise will cause occasional chars
[19:10] <sbasuita> Just got another transmission
[19:10] <sbasuita> it's the repeater with it's callsign in morse
[19:10] <sbasuita> fldigi just prints gibberish though
[19:10] <shellevil> you may need to manually select the frequency the signal is in - unsyure
[19:11] <sbasuita> ok, frequency set to 433
[19:11] <shellevil> I mean - on fldigi waterfall
[19:12] <sbasuita> yep
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[19:15] <edmoore> back
[19:15] <sbasuita> Just got another transmission
[19:15] <sbasuita> it's still printing gibberish
[19:16] <edmoore> transmission of what?
[19:17] <sbasuita> edmoore, trying to get my computer to decode the morse that the local repeater sends out every so often
[19:17] <sbasuita> with fldigi
[19:17] <sbasuita> though people have just started talking
[19:17] <sbasuita> which complicates things ; )
[19:18] <shellevil> there may be something in the fldigi manual on morse, I'm unsure.
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[19:18] <edmoore> morse is hard for computers to decode, we've always found
[19:18] <edmoore> more computer-specific digital modes seem to be a lot more robust
[19:20] <sbasuita> edmoore, well, i've got nothing else to test fldigi with
[19:20] <edmoore> you are correct
[19:21] <sbasuita> edmoore, at the moment i've just got fldigi in cw mode, the waterfall is tuned to the right frequency (don't know if that's nessecary)
[19:21] <sbasuita> anything else you can think of that may need doing?
[19:22] <sbasuita> i guess i need to set the wpm
[19:25] <edmoore> sbasuita: http://www.ukrepeater.net/repeaters/gb7au.htm
[19:25] <sbasuita> edmoore, yep, but that doesn't say the wpm?
[19:25] <edmoore> that's a digipeater - a digital repeater
[19:25] <edmoore> oh it'll be whatever someone uses it with
[19:25] <edmoore> but at least it's more likely to have digital stuff on it
[19:26] <sbasuita> oh right
[19:26] <sbasuita> that's not the voice repeater
[19:27] <sbasuita> what mode should i stick fldigi in then to catch something on that repeater?
[19:28] <edmoore> depends on what people try to use it with
[19:28] <edmoore> so my plan would be just to listen and see what is on
[19:28] <edmoore> then when you get something, describe the waterfall to us
[19:29] <sbasuita> edmoore, thing is i can't listen to the radio at the same time as my computer
[19:29] <sbasuita> edmoore, would need another 3.5<->3.5mm cable for that
[19:29] <shellevil> sbasuita: play with your mixer, you should be able to get it coming out of your PC speakers
[19:30] <sbasuita> shellevil, i don't have any
[19:30] <shellevil> oh
[19:30] <sbasuita> i hook up to my stereo
[19:30] <sbasuita> with the cable that is currently being used for my radio
[19:30] <shellevil> headphones?
[19:30] <sbasuita> hot damn
[19:30] <sbasuita> ; )
[19:30] <sbasuita> anyway
[19:30] <sbasuita> going to go get some dinner now
[19:30] Action: sbasuita will listen out later
[19:30] <shellevil> you can hear headphones plugged into the line port - at low volume
[19:30] <shellevil> very
[19:42] <sbasuita> what exactly does the waterfall in fldigi represent?
[19:42] <sbasuita> surely in this context my radio is already tuned
[19:42] <sbasuita> so what would be the significance of the scale on the waterfall?
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[19:57] <shellevil> each vertical column is frequency
[19:57] <shellevil> each horizontal is time
[19:57] <shellevil> so a on/off beep at 1000Hz would appear as a dashed vertical line
[19:58] <shellevil> at 1000Hz
[19:58] <shellevil> a simple 'one finger' piano tune would appear as a pattern with one spot at a point on the horizontal axis representing the note played at each point in time
[19:59] <sbasuita> ah right
[19:59] <sbasuita> makes sense
[20:06] <sbasuita> I can't get rid of the noise when tuning to http://www.ukrepeater.net/repeaters/gb7au.htm
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[20:19] <shellevil> what sort of qnt4nnq e0 you hqv?
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[20:34] <sbasuita> shellevil, um?
[20:35] <shellevil> The keys are right next to each other.
[20:35] <shellevil> q->a
[20:35] <sbasuita> yep
[20:35] <sbasuita> i have a whip
[20:35] <sbasuita> bout 15cm long
[20:36] <shellevil> oh - this is 433 isn't it.
[20:36] <sbasuita> yes
[20:36] <sbasuita> well
[20:36] <sbasuita> 43
[20:36] <sbasuita> 439*
[20:36] Action: shellevil has just been erecting a 1000m tower with a 12 element 40m yagi on top.
[20:36] <sbasuita> : O
[20:36] <shellevil> (or alternatively, repositioning a 30m wire outside.
[20:36] <sbasuita> ; )
[20:36] <shellevil> the first would be cooler.
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[21:19] <jcoxon> evening all
[21:19] #highaltitude: mode change '+o jcoxon' by ChanServ!ChanServ@services.
[21:19] <jcoxon> Welcome to #highaltitude - discuss anything to do with high altitude projects (balloons, gliders, etc) www.ukhas.org.uk, wiki.ukhas.org.uk
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[21:48] <Laurenceb> hi folks
[21:51] <shellevil> hi
[21:56] <jcoxon> hey Laurenceb and shellevil
[21:58] <Laurenceb> that diydrones site is tempting me to make a uav :P
[21:59] <Laurenceb> I really think a pitot tube is essential
[21:59] <Laurenceb> http://www.sensortechnics.com/index.php?fid=300&fpar=YToxOntzOjQ6InBjaWQiO3M6MjoiOTkiO30%3D&isSSL=0&aps=0&blub=c586664226675348eeddf65c82c14fe2
[22:00] <shellevil> pitot is fun.
[22:00] <shellevil> For my UAV, I plan on 6 or so.
[22:02] <Laurenceb> I think for fixed wing, pitot, 3 axis accel and three gyro axes will be fine
[22:02] <Laurenceb> with a pitot you can filter out centripetal accel from the accelerometer
[22:03] <shellevil> yeah. At least for first flights, I'm oversensoring.
[22:03] <Laurenceb> also with a 5Hz ublox you can filter out wind caused accels at 5Hz
[22:03] <shellevil> 6* pitot (x,-x, ...) 3 triaxial accels, triaxial gyro, magnetometer, IR
[22:03] <shellevil> GPS of course
[22:03] <Laurenceb> expensive :P
[22:03] <shellevil> Possibly laser ranger on a scanner if I get it working
[22:04] <shellevil> yeah - the idea is to work out what sensors I need, and what I can live without
[22:13] <rjharrison> .
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[22:27] <Laurenceb> if you assume wind is horizontal and has a constant direction over timescales of ~100seconds of more, but variable strenght over timescales of ~10seconds
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[22:27] <Laurenceb> then you can use a pitot and gps to find the windspeed
[22:28] <Laurenceb> you can postprocess gyro and gps heading data then low pass filter to find the direction
[22:31] <shellevil> or if you've got basic knowledge about your crafts aero performance...
[22:32] <Laurenceb> its tricky to do things without tons of noise
[22:32] <natrium42> <@jcoxon> Welcome to #highaltitude - discuss anything to do with high altitude projects (balloons, gliders, etc) www.ukhas.org.uk, wiki.ukhas.org.uk <-- fail again :D
[22:32] <jcoxon> damn
[22:32] <jcoxon> i always forget to /topic
[22:32] <jcoxon> hehe
[22:32] <natrium42> yes :)
[22:32] Topic changed on #highaltitude by jcoxon!n=jcoxon@host86-154-32-159.range86-154.btcentralplus.com: Welcome to #highaltitude - discuss anything to do with high altitude projects (balloons, gliders, etc) www.ukhas.org.uk, wiki.ukhas.org.uk
[22:33] <jcoxon> thats better
[22:34] <Laurenceb> I dont see it
[22:36] <shellevil> he simply said the topic
[22:36] <shellevil> not actually changed it
[22:36] <shellevil> as he meant to
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[23:10] <Laurenceb> hmm think I've got it....
[23:11] <Laurenceb> if you imagine gps velocity as a point in velocity space, the measurement from the pitot tube gives you a sphere of possible wind vectors
[23:12] <Laurenceb> then the assumption of wind of a constant direction and variable speed gives you a vector
[23:13] <Laurenceb> from the origin, that will interesct the sphere at the current wind speed
[23:18] <Laurenceb> natrium42: you have a problem
[23:18] <Laurenceb> http://www.sparkfun.com/commerce/product_info.php?products_id=9171
[23:19] <jcoxon> Laurenceb, natrium42 also wants it for his DS
[23:22] <Laurenceb> is there a pic channel?
[23:38] <Laurenceb> #pic deosnt seem to exist
[23:47] <Laurenceb> gtg
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[00:00] --- Wed Apr 22 2009