highaltitude.log.20080109

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[14:00] Nick change: weather -> Laurenceb
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[16:28] <jcoxon> be quiet zeusbot
[16:28] <jcoxon> (sorry everyone if he's been annoying
[16:28] <jcoxon> )
[16:28] <jcoxon> you need to op him
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[20:10] <jcoxon> evening RocketBoy
[20:16] fnoble (i=fergus@81-178-208-117.dsl.pipex.com) joined #highaltitude.
[20:16] <fnoble> hey
[20:17] <jcoxon> hey fnoble
[20:22] <RocketBoy> evening all
[20:22] Action: jcoxon has one of neontube's weather satellite recievers
[20:23] <jcoxon> now to make an antenna
[20:24] <fnoble> neat, bue sure to post photos when you get it working :)
[20:24] <fnoble> *be
[20:24] <jcoxon> i've rewired the power socket, to actually take a real plug
[20:24] <jcoxon> so it works just doesn't get any reception
[20:25] <fnoble> does it need a fairly substantial antenna?
[20:25] <jcoxon> yeah
[20:26] <jcoxon> http://jcoppens.com/ant/qfh/fotos.en.php
[20:26] <jcoxon> but i think its quite do able
[20:27] <fnoble> ah circularly polarised jobby
[20:27] <jcoxon> i reckon a couple of pvc pipes, hacksaw, drill and some coax should to the job
[20:28] <jcoxon> though i'm not sure what coax, i'm hoping TV stuff would do the job
[20:28] <jcoxon> RocketBoy, you around?
[20:29] <RocketBoy> yep
[20:29] <RocketBoy> QFHA for 137Mz?
[20:29] <jcoxon> yup
[20:30] <jcoxon> wrong choice?
[20:30] <RocketBoy> nope - vgood
[20:30] <jcoxon> what coax should i use?
[20:30] <jcoxon> would i get away with tv coax?
[20:31] <RocketBoy> yep - although i'm not sure of the feed impedance
[20:31] <RocketBoy> tv coax is 75ohm
[20:31] <jcoxon> where would i find that?
[20:31] <RocketBoy> some antennas are set up for 50ohm
[20:31] <jcoxon> it says 50 ohms on the back of hte box...
[20:31] <RocketBoy> should be on the site
[20:34] <RocketBoy> well 50ohm co-ax would be better then
[20:35] <jcoxon> where would i find 50 ohm coax?
[20:36] <RocketBoy> maplins etc.
[20:36] <RocketBoy> if you have tv co-ax i'd try it with that 1st
[20:37] <jcoxon> nah i need to go and get some
[20:38] <RocketBoy> UR67 us typically what you would use - about 6mm dia
[20:39] <jcoxon> found it on the maplins' website
[20:40] <RocketBoy> ugh £2.70 a meter - what a rip off
[20:40] <jcoxon> ha
[20:40] <jcoxon> where else would sell it, the problem about being in london is that shops like hardware shops are never in the centre
[20:42] <jcoxon> i'm going to need about 5m
[20:46] <RocketBoy> just been looking RG58 is ok too
[20:47] <RocketBoy> works aout at about 25p/meter - if you buy 100m - just to let you know the level of rip off
[20:47] <jcoxon> ouch
[20:48] <RocketBoy> sorry no idea other than TV/fhi-fi shops
[20:48] <jcoxon> oh well
[20:48] <jcoxon> i'll get teh RG58
[20:49] <jcoxon> hows HARVe?
[20:53] <RocketBoy> OK - I have been working on a GPS generator to test it with a flight simulation
[20:53] <RocketBoy> I sould be testing it tomorrow night
[20:54] <RocketBoy> its should be a reasonably comprehensive test - other than thge
[20:54] <RocketBoy> GPS itself
[20:55] <RocketBoy> I got to the bottom of the GPS problems - I concluded the best thing was to live with the longer co-ax
[20:56] <RocketBoy> its really strange shortening the co-ax causes such a problem
[20:56] <jcoxon> was the length of the cable just right to cause an oscilation?
[20:57] <RocketBoy> I concluded that was the same problem I had when I shortened the co-ax on MCs ppayload
[20:57] <jcoxon> cause i've shortened cables before - but i guess i used shielded processors
[20:57] <RocketBoy> yep I think the short length actas as an antenna and radiates enough to feed back
[20:59] <jcoxon> interesting
[20:59] <jcoxon> firefly is coming along nicely - should soon be in a position to launch
[20:59] <RocketBoy> nah it must be the antenna - i unplugged the PIC chip - the only thing powered was the GPS
[21:00] <RocketBoy> and the antenna through the GPS
[21:00] <jcoxon> but again i've only really used intergrated gps units
[21:00] <jcoxon> both on the gumstix and the gm862
[21:01] <RocketBoy> yep - well it wouldm probably be ok with an antenna with lower gain - I think the spec is about 23db
[21:01] <jcoxon> well i've shorted the antenna cable for firefly2
[21:01] <jcoxon> got a lock immediately
[21:02] <RocketBoy> humm - I tried two different active antennas and got the same result
[21:02] <jcoxon> i've done it with 2 antennas and been fine
[21:03] <jcoxon> how strange
[21:03] <RocketBoy> do you know what ones they were
[21:04] <RocketBoy> its possible its the antenna connector to the GPS - its rather rough and ready
[21:04] <RocketBoy> it may be a poor match to the co-ax
[21:05] <RocketBoy> which will case a reflection - which casuses the co-ox outer braiding to radiate
[21:06] <jcoxon> i'm not sure what they are, the one i've got, i've removed the base along time
[21:06] <RocketBoy> case = cause btw
[21:08] <RocketBoy> i'm still looking for a module with integrated antenna and ttl level output
[21:08] <RocketBoy> at a reasonable £
[21:08] <jcoxon> em406a
[21:08] <jcoxon> but its a SIRF III
[21:08] <RocketBoy> a works over 60k
[21:08] <RocketBoy> a = and
[21:08] <jcoxon> RocketBoy, sounds like you are looking for the holy grail of gps units
[21:09] <RocketBoy> yep
[21:09] <RocketBoy> I have a feeling the one inside my garmin etrex would do
[21:11] <jcoxon> would require some dissection
[21:12] neontube (n=davemart@neontube.plus.com) joined #highaltitude.
[21:12] <jcoxon> hey neontube
[21:12] <jcoxon> good conference?
[21:12] <neontube> evening all
[21:13] <neontube> yer not bad
[21:13] <neontube> got some good contacts for my forensic work
[21:14] <neontube> got a compy of the big rapid electronics catalouge too
[21:15] <neontube> found they do an in circuit programing adapter for my pic programmer which is ool
[21:15] <neontube> *cool
[21:16] <jcoxon> RocketBoy, i've got a thought, might need a bit of adaptation
[21:16] <jcoxon> the old CF gps units
[21:16] <jcoxon> they are SIRF II
[21:16] <jcoxon> and have a serial to CF adapter
[21:16] <jcoxon> which are often rather easy to seperate
[21:18] <jcoxon> http://cgi.ebay.co.uk/CF-GPS-HP-IPAQ-h2110-h2410-h2750-TOMTOM-3_W0QQitemZ250202946547QQihZ015QQcategoryZ156955QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
[21:18] <neontube> i'm sure u will be able to adapt them
[21:18] <RocketBoy> humm - looks like its worth a bid
[21:19] <neontube> there is going to be a ttl level signal stream somewhere on the boards
[21:22] <jcoxon> http://www.headfuzz.co.uk/gpsmain
[21:23] <jcoxon> more this
[21:23] <jcoxon> http://www.headfuzz.co.uk/gps1
[21:24] <neontube> looks good
[21:24] <RocketBoy> yep thats just the thing - logic levels
[21:24] <neontube> anyway, i'm going now, was out till 3 last night, then up at 5 to get train to london, on feet all day, standing on the tube for 40 min, then a bumpy ride on the train back... i need sleeeeeeeeeeep
[21:25] <neontube> t'ra all
[21:25] <jcoxon> neontube, night
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[21:27] <jcoxon> thats actually the model i used for pegasus II
[21:27] <jcoxon> however
[21:27] <jcoxon> cause it stuck quite far out of the gumstix it came lose at launch
[21:29] <RocketBoy> ok - i'll take a nose round ebay
[21:29] <jcoxon> well that was my assesment
[21:30] <jcoxon> but i reckon it'll be an easy dissection and hack up
[22:35] <jcoxon> RocketBoy,
[22:35] <jcoxon> have you seen the icom pcr1000 recievers?
[22:35] <jcoxon> what do you think of them?
[22:42] <jcoxon> ooooooo a ft790
[22:43] <jcoxon> RocketBoy, how much would you say is a reasonable price?
[22:43] <jcoxon> its at 92 gbp right now
[22:47] <jcoxon> now ?102
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[23:03] Laurence1 (n=laurence@dhcp39-071.sthughs.ox.ac.uk) joined #highaltitude.
[23:03] <Laurence1> hi all
[23:05] <natrium42> hiya
[23:05] <Laurence1> hmm cant change my nick
[23:05] <Laurence1> I'm using pidgin
[23:06] <jcoxon> can't you pass a command?
[23:06] <jcoxon> "/nick Laurence"
[23:06] <Laurence1> its not recognising it
[23:06] <jcoxon> why are you using pidgin?
[23:06] <Laurence1> cuz its the default irc client on ubuntu
[23:07] <jcoxon> yuk
[23:07] <Laurence1> lol
[23:07] <jcoxon> use synaptic to install xchat
[23:07] <Laurence1> k good plan
[23:07] <jcoxon> or from the command line
[23:07] <jcoxon> sudo apt-get install xchat
[23:08] <Laurence1> ok, how does sudo know where to find Xchat?
[23:08] <jcoxon> nah sudo gives you root permissions for the command
[23:08] <jcoxon> and apt-get is the actually command
[23:08] <Laurence1> ok
[23:08] <jcoxon> it'll contact the server and get the .deb file and install it
[23:08] <Laurence1> but still, how does it find xchat?
[23:08] <jcoxon> well it has a cache
[23:08] <Laurence1> does it just have a default server?
[23:08] <jcoxon> oh yes
[23:09] <jcoxon> lots
[23:09] <Laurence1> I see, clever
[23:09] <Laurence1> hmm "E: couldn't find Xchat"
[23:10] <jcoxon> Xchat?
[23:10] <Laurence1> oh capitals doh
[23:10] <jcoxon> Laurence1, this is unix
[23:10] <jcoxon> well *nix
[23:11] <Laurence1> ok its working, I see its found the package on a ubuntu server
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[23:12] <jcoxon> yup, tis the joys of a debian based OS
[23:12] <Laurence1> hello Laurenceb
[23:13] <Laurenceb_> hello Laurence1
[23:13] <jcoxon> Laurence don't talk to yourself
[23:13] <Laurenceb_> hmm the graphics aren't as fancy
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[23:14] <jcoxon> pidgin though is more of an IM client
[23:14] <Laurenceb_> yes
[23:15] <Laurenceb_> it supports multiple protocols
[23:21] <Laurenceb_> I've been working on the particle sampler, the pressure sensor is talking to the avr
[23:24] <jcoxon> night Laurenceb
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[23:25] <RocketBoy> night all
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[00:00] --- Thu Jan 10 2008