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[13:56] <macfreak4> hello/
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[17:59] <jcoxon> hey macfreak4
[21:59] defy (n=defy@60-234-234-98.bitstream.orcon.net.nz) joined #highaltitude.
[21:59] <defy> hey guys
[22:01] <defy> gpsstix should be arriving this arvo :D
[22:40] <macfreak4> hey
[22:41] <defy> hows it going
[22:41] <macfreak4> good
[22:41] <macfreak4> just wired up a voltage regulator in my payload
[22:41] <defy> cool
[22:41] <macfreak4> i *accidentally* shorted my lithium batteries tho!
[22:42] <macfreak4> only for a breif moment (<1sec) but
[22:42] <macfreak4> the voltage went down a bit...
[22:42] <defy> ick
[22:42] <defy> what are you powering exactly?
[22:43] <macfreak4> a dell latitude motherboard (400mhz pentium 2)
[22:43] <macfreak4> :D
[22:43] <defy> sweet
[22:43] <macfreak4> it'll tx gps positions, sensor data, and SSTV images (Slow Scan TV)
[22:43] <macfreak4> so...
[22:43] <defy> is that a laptop mb?
[22:44] <macfreak4> yea
[22:44] <macfreak4> the laptop was around 2 or 3 kilos when it was fully assembled and just the motherboard is quite light
[22:44] <defy> thats cool, I thought about using one of my slimline laptops for a while
[22:45] <macfreak4> yea, although im not certain exactly what its avg current consumption is -- im going to be running a little test in a moment tho ;)
[22:45] <defy> it sure would make imaging a lot easier..what are you using for communication?
[22:46] <macfreak4> a 1 watt VHF handheld transceiver
[22:46] <macfreak4> on the HAM 2-meter band
[22:46] <defy> oh nice, I wanted to use that setup too but I'm yet to find a tnc I can get working
[22:46] <macfreak4> im not using packet ;)
[22:46] <macfreak4> rtty
[22:47] <macfreak4> much easier, especially with the free MMTTY engine for VisualBasic
[22:47] <macfreak4> (MMTTY is a freeware RTTY program for Win9x/NT)
[22:47] <defy> hrm interesting, i didn't know that was possible
[22:47] <macfreak4> yeah its pretty cool, all it needs hardware-wise is an audio card
[22:47] <defy> its not just software packet?
[22:48] <macfreak4> it sends text as tones (5-bit baudot)
[22:48] <macfreak4> nope
[22:48] <macfreak4> its the protocol that old radio teletypes used back in the 30's and 40's
[22:48] <macfreak4> its slow, around 50-100 baud, but it works for simple things like gps sentences
[22:49] <defy> i have an old XR-1 i wanted to use, i've tried soundmodem, which didn't work all that well..and a couple of tnc's
[22:49] <macfreak4> hmm... well i'd suggest trying out RTTY
[22:49] <macfreak4> google MMTTY and download it
[22:50] <macfreak4> (if you're running windows)
[22:50] <defy> yea it sounds interesting, do you know if its supported in linux?
[22:50] <defy> I'll be running windows for my ground station most likely
[22:50] <macfreak4> ooh
[22:50] <macfreak4> that makes it easier
[22:50] <macfreak4> because transmitting RTTY is MUCH easier than receiving it...
[22:50] <macfreak4> you could make your own program in linux to transmit and use MMTTY to receive
[22:51] <defy> cool
[22:51] <macfreak4> here i'll get ya a link...
[22:51] <defy> to basically just make it transmit cords and sensor data continuously?
[22:52] <macfreak4> yea
[22:52] <defy> yea google seems to think that rtty is very supported in linux, so ill definitely give it a shot
[22:52] <macfreak4> sweet
[22:52] <macfreak4> heres some background info on RTTY: http://www.southgatearc.org/data/rtty/
[22:53] <defy> cool thanks
[22:53] <macfreak4> np
[22:55] <macfreak4> i was going to use linux, but my webcam isnt supported
[22:55] <macfreak4> and i've never programmed in linux, so i didnt think it would be a good idea this time...
[22:56] <defy> well thats cool, the new gumstix gps card which _should_ be arriving today also has sound on it
[22:57] <defy> so that might work out quite nicely
[22:57] <macfreak4> oh thats good
[22:57] <macfreak4> are ham radio's an option where you live/
[22:58] <macfreak4> jcoxon says they're not in the uk
[23:01] <defy> yea the bands are all open here
[23:01] <defy> just need a ham license
[23:01] <macfreak4> o me too lol
[23:01] <macfreak4> where are you located?
[23:01] <defy> new zealand
[23:01] <macfreak4> oh sweet
[23:01] <macfreak4> i was just there ;)
[23:01] <defy> hah awesome...just visiting?
[23:01] <defy> speaking pf the gpsstix, it just arrived :D
[23:02] <macfreak4> yeah about 9 months ago, drove all around the southern island for 2 weeks
[23:02] <defy> cool
[23:02] <macfreak4> seems like everyone's using gumstixes
[23:03] <macfreak4> i should look into them some more
[23:03] <defy> they're nice little units...as soon as they have a usb host on them they'll be pretty much perfect
[23:04] <macfreak4> ya i looked around for some cheap equivalents when i was still planning but eventually i decided to use what i already have
[23:04] <macfreak4> and i REALLY liked the idea of getting images back live too
[23:04] <defy> yea I'd like live images or video back, not too sure how to go about that
[23:04] <defy> at first i was just thinking of using the packet, and only getting an image back every 20 minutes or so
[23:04] <defy> but i think that could be more trouble than its worth
[23:05] <macfreak4> well SSTV takes ~30 secs to send a full-quality 320x240 image
[23:06] <defy> now i have to google SSTV :P I'm really quite new to radio
[23:06] <macfreak4> and since the same guy who wrote MMTTY wrote an SSTV program for Windows that comes with a handy engine for VB6
[23:06] <macfreak4> i couldnt resist
[23:06] <defy> sweet
[23:06] <macfreak4> yea i have never touched a ham radio in my life nor seen one in person so
[23:06] <macfreak4> im pretty much new too
[23:06] <defy> sweet
[23:07] <macfreak4> i've played around with RTTY and SSTV just by using audio cables and two computers
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[23:10] <macfreak4> heya
[23:12] <icez> howdy
[23:16] <macfreak4> 770mA idling voltage -- that's without any energy saving options turned on
[23:16] <macfreak4> thats for my payload's laptop
[23:17] <macfreak4> which gives ~3.625 hrs runtime
[23:17] <macfreak4> :/
[23:17] <defy> what devices do you have hanging off of the board?
[23:17] <macfreak4> nothing but the motherboard and cf card
[23:18] <macfreak4> that's awful high for such a laptop...
[23:18] <macfreak4> i mean, my ibook g4 consumes that much with an lcd and hard drive spinning
[23:18] <macfreak4> and this is only a pentium 2
[23:19] <defy> aren't newer boards much more efficient with power though
[23:19] <macfreak4> probably
[23:19] <macfreak4> i was hoping for at least less than 500mA
[23:19] <macfreak4> im surprised...
[23:20] <defy> my 3 gumstix boards together with a gyro use about 650ma
[23:20] <defy> at 5v though
[23:23] <jcoxon> hey all
[23:24] <macfreak4> hey
[23:24] <jcoxon> just been to the cinema
[23:24] <jcoxon> saw Shooting Dogs
[23:24] <jcoxon> wow
[23:24] <macfreak4> lol
[23:25] <macfreak4> im turning on the smart cpu power saving feature now -- it regulates the cpu clock speed according to how much it's gotta do
[23:25] <macfreak4> that should save a lot on power but we'll see...
[23:28] <macfreak4> yay!
[23:28] <defy> much better?
[23:28] <macfreak4> almost cut the power consumption in half
[23:28] <jcoxon> :-D
[23:28] <defy> hey jcoxon :)
[23:28] <macfreak4> from 770mA to 380mA idling
[23:28] <macfreak4> it was around 440mA at load
[23:28] <jcoxon> hey defy
[23:34] <macfreak4> do you guys know if there's a max altitude for Garmin's GPS 18?
[23:34] <jcoxon> most gps say they max out at 18km
[23:35] <jcoxon> however i've gone higher and they seem to work fine
[23:35] <macfreak4> huh
[23:35] <macfreak4> well i guess thats a good thing
[23:35] <macfreak4> my physics teacher donated a GPS 18 for the cause
[23:35] <jcoxon> they thing is that if you plot altitude vs time on a graph
[23:35] <macfreak4> so i was curious
[23:35] <jcoxon> your height gain should remain the same
[23:36] <jcoxon> so if it goes weird its probably stopped working
[23:36] <macfreak4> ok
[23:36] <macfreak4> another question...
[23:36] <jcoxon> go for it
[23:36] <macfreak4> the lithium AA's that I have are rated for 2900mAh
[23:36] <jcoxon> yup
[23:37] <macfreak4> and I've just turned on my laptop's mobo for testing, which as i've said was pulling about 700-800mA
[23:37] <macfreak4> and the batteries went from 1.8v per cell (!!) to 1.5v per cell in under a minute
[23:37] <jcoxon> hmmm electronics isn't my best field
[23:40] <macfreak4> @!@!$
[23:40] <jcoxon> haha
[23:40] <defy> just let it run and see how long it takes to die :P
[23:40] <macfreak4> ok sorry my volt meter just read 18v when under load, which is impossible because the laptop was running and the regulator outputs 20v
[23:40] <macfreak4> if anything gets near 21.5v or less, the regulator will shut off so obviously my voltmeter is screwed
[23:41] <defy> hey macfreak4 does rtty use push to talk?
[23:42] <defy> or does it rely on the transmitter to always be transmitting
[23:43] <macfreak4> well mmtty does, but i have no clue how ppt works
[23:43] <macfreak4> maybe you could fill me in?
[23:43] <macfreak4> ;)
[23:43] <defy> well as far as i know its just an electrical way of pushing the transmit button
[23:45] <macfreak4> but how
[23:45] <defy> but a simple sound card wont do that, something would have to be rigged to trigger it...unless one end is always sending, and the other is always receiving
[23:45] <macfreak4> i mean, you could open up the radio and solder a transistor across the PPT button, sure, but there seems to be a standard
[23:45] <defy> well the transceiver will have to support it
[23:45] <macfreak4> o ok
[23:45] <defy> you mean for an always on option?
[23:45] <macfreak4> well MMTTY has an option to use an available serial port for PPT so i guess that's how it works...
[23:46] <defy> yea, most of the ptt hacks i've seen just used the serial port
[23:46] <defy> one used something soldered off of the sound card, but that seems like much too much effort
[23:46] <macfreak4> o
[23:47] <macfreak4> well i was going to use an available pin on the parallel port and rig a transistor up to the button as i said earlier...
[23:47] <macfreak4> but theres gotta be a better way
[23:47] <defy> cool..whatever works, i just wasn't sure if rtty used it...i guess it would have to if it wanted to be bidirectional
[23:49] <macfreak4> yea
[23:52] <jcoxon> hmmmm how do i use a/d on my audiostix2?
[23:57] <defy> I'm still working out how to get the sound working :P
[23:57] <jcoxon> nah i don't need that!
[23:58] <defy> well macfreak4 has gotten me excited about rtty and sstv so i want to play around with it a bit
[23:58] <defy> the latest link i can find to drivers on the gs wiki is from 2004 though, heh
[23:59] <defy> i guess its just a kernel option
[00:00] --- Fri Apr 28 2006