highaltitude.log.20060720

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[18:30] <jcoxon> hey rocketboy
[18:35] <phatmonkey> hi james, hi steve
[18:35] <phatmonkey> i will change those links on ukhas.org.uk
[18:35] <jcoxon> thanks
[18:36] <jcoxon> spent the afternoon reorganising the site
[18:36] <jcoxon> all the pictures are now up
[18:36] <phatmonkey> nice
[18:36] <phatmonkey> i think i will maintain glider.phatmonkey.org.uk as a similar thing to yours, but keeping the bulk of the information on the wiki
[18:37] <Tiger^> whee
[18:37] <Tiger^> a new domain
[18:37] <phatmonkey> flight reports in simple html like yours are much easier to read, and are slashdotting/digging/blogging friendly i guess
[18:38] <jcoxon> :-D
[18:38] <phatmonkey> http://www.pegasushabproject.org.uk/logs/
[18:38] <phatmonkey> links point to the wrong place
[18:38] <jcoxon> oops
[18:38] <phatmonkey> make that logs.html i suppose!
[18:38] <phatmonkey> long range wifi is a little pointless now we have this 434mhz radio isn't it? might be interesting to see if we can do it though
[18:39] <jcoxon> actually thats what i wanted it to log to
[18:39] <jcoxon> phatmonkey, oh i know - i've delayed updating it till i had properly moved
[18:39] <jcoxon> one of the big reasons for moving was more space and also some google ads
[18:40] <phatmonkey> yeah
[18:40] <phatmonkey> are you paying for this hosting?
[18:40] <jcoxon> yup (i didn't want to burden other people with i :-D )
[18:40] <jcoxon> it*
[18:41] <phatmonkey> :o!
[18:41] <phatmonkey> paying for hosting, shocking :P
[18:41] <phatmonkey> ok, i think i've changed all the links
[18:41] <jcoxon> thanks
[18:48] <rocketboy> hi
[18:49] <rocketboy> hey jcoxon - what is the highest you have got a text message back from?
[18:49] <jcoxon> ummm about 2000ft
[18:50] <rocketboy> Ok - as I thought - I was wondering if a ground facing moble phone yagi would work
[18:51] <jcoxon> interesting
[18:51] <rocketboy> but it wouldn't at 60Kft thats 30 times the distance - which would take 900 the gain - about 3dB
[18:51] <rocketboy> 30dB
[18:51] <jcoxon> also it wouldn't be helpful on landing
[18:52] <rocketboy> no yagi will give you that
[18:52] <rocketboy> agreed - just think about alternatives - 434 is the way to go
[18:52] <rocketboy> thinking
[18:53] <jcoxon> i'm thinking 434 as well
[18:53] <phatmonkey> rocketboy, question: what sort of antenna would i use on the glider? a downward pointing antenna like the one on pegasus III might not be practical, expecially if it's going to get covered up/squished on landing
[18:53] <jcoxon> with mobile phone as well - for on the ground
[18:53] <rocketboy> I have a new 434 module comming tomorrow which looks like it will be a bit better for a long distance (DX) data link
[18:54] <phatmonkey> nice
[18:54] <rocketboy> the testing should tell
[18:54] <phatmonkey> would any other antennas be suitable?
[18:55] <rocketboy> humm - well quite a few - but not quite as good (which might not be a problem - given how well it worked)
[18:55] <jcoxon> i'd got for the 1/4 wave like peg III
[18:55] <jcoxon> you've got a phone onboard for landning
[18:56] <rocketboy> perhaps 2 transmitters - one below and one on top
[18:56] <phatmonkey> it'll probably cause too much drag, this plane really is just a slim wing
[18:56] <phatmonkey> yeah
[18:56] <jcoxon> rocketboy, in regards to intergrating the datalink - do you plan to attach it to the gumstix?
[18:56] <rocketboy> alternativly just put a dipole in the wing
[18:56] <jcoxon> or as a seperate system?
[18:57] <phatmonkey> what sort of modems would you have to use?
[18:57] <rocketboy> The current plan is to do a special packet radio TNC - which has a serial interface
[18:57] <rocketboy> 9600 baud probably
[18:58] <rocketboy> it implements a protocoil called KISS (keep it simple stupid)
[18:59] <rocketboy> its just a serial string starting and ending with special marking characters
[18:59] <rocketboy> - quite simple
[18:59] <jcoxon> right so the pegV gumstix can provide a serial port (that is if you want to fly on peg V :-D
[19:00] <phatmonkey> how much current do you expect the transmitter and modem to draw?
[19:00] <rocketboy> phat - I'm looking at a format called HF packet - its 300baud FSK (Frequency shift Keeying)
[19:00] <rocketboy> that should get through even with weak signals
[19:00] <phatmonkey> ok
[19:01] <rocketboy> jcox - yes It'll plug into a serial port (TTL levels - not RS232)
[19:01] <phatmonkey> jcoxon, when do you think you'll be launching peg V? :D
[19:01] <jcoxon> rocketboy, ttl is fine with me (saves me having to voltage shift
[19:01] <rocketboy> likewise
[19:01] <jcoxon> phatmonkey, hmmm well i get back on the 8th Aug
[19:01] <phatmonkey> hm, i have no way to hook it up
[19:02] <phatmonkey> i'll ask the mailing list if there's a simple way to access other serial ports
[19:02] <phatmonkey> okay
[19:02] <jcoxon> so very late aug/early sept
[19:02] <jcoxon> rocketboy that okay?
[19:02] <rocketboy> should be - I'm at a rocket event August bank holiday week
[19:02] <jcoxon> no problem
[19:03] <jcoxon> i think its best we don't rush - get hte best possible weather etc
[19:03] <phatmonkey> it looks like my glider will run into term time, hmmm
[19:03] <phatmonkey> everything's taking longer than i hoped
[19:03] <rocketboy> agred
[19:03] <phatmonkey> i guess a high altitude glider in 3 months is pushing it a bit...!
[19:04] <rocketboy> (id agree)
[19:04] <jcoxon> phatmonkey, its one of things - always takes a little longer :-D
[19:04] <phatmonkey> well, we almost have an autonomous plane running in under a month
[19:04] <phatmonkey> yeah
[19:04] <jcoxon> just don't rush it - it'll take another 3 months to build a second
[19:04] <phatmonkey> that's an achievement i geuss
[19:04] <jcoxon> yeah it is
[19:05] <jcoxon> rocketboy, hopefully henry and carl will be in a launch position by then
[19:05] <phatmonkey> just waiting on the thermopiles now, i'm going to buy the same kit defy got
[19:05] <rocketboy> OK
[19:05] <phatmonkey> my homebrew was doing all sorts of crazy things (sine wave output), that even the designer couldn't explain :D
[19:05] <phatmonkey> when does your launch release last till?
[19:06] <jcoxon> 16th sept
[19:06] <phatmonkey> is it hard to get these applications that last a long time? I might consider getting one
[19:07] <jcoxon> hmmm it isn't difficult but we are sort of abusing it
[19:07] <jcoxon> we are meant to be launching every week
[19:07] <jcoxon> its best to go for a small window
[19:07] <jcoxon> the month advance is a good way of giving yourself time
[19:07] <phatmonkey> true
[19:08] <phatmonkey> once i have it working though, i want to keep up regular launches until we get it running right
[19:08] <jcoxon> so after this window ends i'll get individual launch windows
[19:08] <phatmonkey> i'll have to find a cheap supply of balloons, then i can probably fit in a launch every few days
[19:08] <phatmonkey> yeah
[19:08] <jcoxon> perhaps go for a couple of launches in say 3 weeks
[19:08] <jcoxon> not unlimited for 10 weeks
[19:09] <phatmonkey> yeah
[19:10] <rocketboy> bbl
[19:13] <phatmonkey> okay
[19:17] <jcoxon> so ben
[19:18] <jcoxon> hehe actually i talk to you about this later
[19:18] <jcoxon> being called away
[19:18] <jcoxon> bbl
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[19:22] <phatmonkey> hokay!
[19:22] <phatmonkey> hi icez!
[19:22] <icez> hi
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[22:50] <jcoxon> back again :-D
[22:50] <phatmonkey> hi james!
[22:50] <phatmonkey> got no reply from these rocket guys :(
[22:51] <jcoxon> parachute people?
[22:51] <phatmonkey> yes
[22:51] <phatmonkey> the american one, not the guys you got yours from
[22:51] <phatmonkey> uurrmm
[22:51] <phatmonkey> the rocket man, that's it
[22:52] <phatmonkey> did you want to talk about something earlier?
[22:52] <jcoxon> oh yes
[22:52] <jcoxon> hehe
[22:52] <jcoxon> just when were we going to hold our first ukhas meeting :-p
[22:53] <phatmonkey> haha, beats me
[22:53] <phatmonkey> it doesn't quite work when we're spread around the world like this does it...
[22:54] <jcoxon> i think we should encourage people to sign up to the members page
[22:54] <jcoxon> also that mailing list would help
[22:54] <phatmonkey> yes
[22:54] <jcoxon> finally we are ukhas so the uk contingent can of course meet!
[22:54] <phatmonkey> just start adding people to the page, then point them to it so they can fill in their details
[22:54] <jcoxon> hmmmm i still think its best we ask
[22:55] <phatmonkey> ok
[22:55] <jcoxon> we can add them once we have their permission
[22:55] <icez> we could use a meetingbot and !start and it would log the meeting nicely and !stop it at the end :}
[22:55] <jcoxon> save them signing up
[22:55] <phatmonkey> balloon launches would be a convenient time to meet i guess!
[22:55] <phatmonkey> yes
[22:55] <phatmonkey> hehe
[22:55] <phatmonkey> hmm...
[22:55] <jcoxon> icez, i could get zeusbot to do that
[22:57] <phatmonkey> i will probably dump my netMMC card for the final thing - the 16mb flash is probably masses for logging
[22:57] <jcoxon> yup
[22:59] <phatmonkey> i suppose i'll need the MMC card for verbose development
[22:59] <phatmonkey> how often did you log data?
[23:00] <jcoxon> hmmm every couple of seconds
[23:01] <jcoxon> actually it was at the rate of the gps data
[23:01] <jcoxon> but the logrotate script every 10 mins gzipped it
[23:01] <phatmonkey> that is a good idea
[23:02] <phatmonkey> wow, my gps is huge in comparison to the gumstix/robostix
[23:02] <phatmonkey> i trust this beast though!
[23:03] <jcoxon> :-)
[23:04] <phatmonkey> i bet the friggin cable on the antenna is many times heavier than the computer
[23:04] <phatmonkey> hehe
[23:04] <jcoxon> hehe
[23:05] <jcoxon> yeah i have a lot of excess cable
[23:05] <phatmonkey> hmmm, how come the connex has R687 on it, but the sticker says R773
[23:05] <phatmonkey> software i guess?
[23:06] <jcoxon> 773 is the software revision that comes with the gumstix at the mo
[23:06] <phatmonkey> ok
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[00:00] --- Fri Jul 21 2006