highaltitude.log.20100302

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[09:26] <russss> http://forums.somethingawful.com/showthread.php?threadid=3271649&userid=0&perpage=40&pagenumber=1
[09:26] <russss> those crazy danish people
[09:27] <jcoxon> they are crazy
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[09:30] <jcoxon> russss, you going to the hackspace this evening?
[09:30] <russss> yeah
[09:31] <jcoxon> what time does it kick off?
[09:32] <russss> I usually get there at about 7:20ish
[09:33] <russss> sometimes people are there before me
[09:36] <jcoxon> my final annoying question re: G5 - does it have a powersupply still in it?
[09:36] <jcoxon> cause if not i might as well give up :-p
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[14:06] <jcoxon> anyone used UNetBootin before?
[14:06] <jcoxon> really impressive way of making usb boot disks
[14:13] <juxta> evening jcoxon
[14:14] <jcoxon> hey ju
[14:14] <jcoxon> hey juxta
[14:14] <jcoxon> oops - auto complete fail
[14:16] <juxta> hehe
[14:16] <juxta> license all taken care of :)
[14:16] <jcoxon> great
[14:16] <juxta> I got my full license, just waiting on the paperwork now
[14:18] <jcoxon> that seemed easy
[14:18] <juxta> yeah it wasnt too bad
[14:18] <juxta> it only just scraped through on the regulations though
[14:18] <juxta> I got 70% - the passing mark ;)
[14:19] <Twiner> congrats. :)
[14:19] <jcoxon> :-)
[14:20] <juxta> standard license allows digi modes and 100w, yay
[14:20] <jcoxon> thats far better then the foundation one
[14:20] <juxta> yup :)
[14:20] <juxta> advanced would be nice, i might sit that later - it allows 400w and a bunch more bands
[14:21] <juxta> the bands dont matter so much, but you can use some nice emission modes
[14:21] <juxta> on 70cm you can take as much bandwidth as you like if you have an advanced license
[14:22] <jcoxon> oh wowo
[14:22] Action: jcoxon is reflashing the rom on his geforce fx 5500 to work on macs
[14:22] <juxta> heh.. sounds hairy =\
[14:22] <Twiner> 400W tx is quite a lot.
[14:23] <juxta> jcoxon, I made a CW beacon around your code, hope thats ok :)
[14:23] <jcoxon> oh no worries
[14:23] <juxta> http://projecthorus.org/wp-content/uploads/2010/03/IMG_3426.jpg
[14:23] <juxta> one of those little cheapo transmitters from sparkfun
[14:24] <Twiner> You could potentially give people cancer with that amount of RF. :P
[14:24] <juxta> heh
[14:24] <Twiner> Cooking them from the outside in.
[14:25] <juxta> I even made a little copper 'silkscreen' too :D
[14:25] <juxta> http://projecthorus.org/wp-content/uploads/2010/03/IMG_3431.jpg
[14:27] <juxta> jcoxon: I spent ages trying to work out why I was having issues sending some strings with your code
[14:27] <juxta> in the end it was my fault - i was overflowing the char array I was putting my string in :)
[14:31] <jcoxon> hehe - you're loving the pcb making
[14:32] <jcoxon> looks really smart
[14:32] <jcoxon> far nicer then mine
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[14:36] Action: jcoxon has reflashed the graphics card
[14:36] <jcoxon> fingers crossed i got it right
[14:37] <jcoxon> as its going to be a challenge to reflash it back
[14:40] <juxta> how do you do it jcoxon?
[14:40] <juxta> software? or a hardware hack?
[14:42] <jcoxon> ummm used a dos program called nvflash and some hacked up roms that are online
[14:42] <jcoxon> so made a freedos usb disk
[14:42] <jcoxon> made a backup of the original rom, then reflashed with the new one
[14:43] <juxta> ah right
[14:43] <jcoxon> now the graphics card doesn't work on my pc so either its bust or its ready got a mac :-p
[14:43] <jcoxon> got -> for
[14:43] <juxta> heh
[14:43] <juxta> why can't a mac work with it as standard?
[14:43] <jcoxon> cause they are annoying
[14:44] <juxta> that is annoying
[14:44] <jcoxon> you can get 'for mac' graphics cards though they are limited and hard to find
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[14:44] <juxta> jcoxon: you use the arduino bootloader & cores on your atmegas, dont you?
[14:44] <jcoxon> yeah
[14:45] Action: russss picked up a load of ATTiny13As for the space
[14:45] <juxta> me too - do you know of an easy way to lower the clock speed?
[14:45] <russss> pretty amazing little chips
[14:45] <jcoxon> russss, yeah those attinys would be more appropriate for our beacons really
[14:45] <juxta> I mean I can run a slower crystal, but what about recompiling the bootloader/adjusting the libraires to fix the serial delays etc
[14:45] <russss> they're like 95p each
[14:45] <juxta> agreed, they would be - but I dont even have an AVR programmer at the moment :)
[14:45] <jcoxon> there are guides on the arduino website somewhere
[14:46] <jcoxon> russss, all set to try and rescucitate that G5
[14:46] <russss> I wanted to build something with a 555 and some op-amps but it turns out the ATtiny13 is cheaper.
[14:47] <jcoxon> juxta, i use internal osc at 8mhz
[14:47] <juxta> ah right
[14:47] <juxta> and just use the 3v/8mhz targets and the code existing for that?
[14:48] <jcoxon> yeah
[14:48] <russss> I'm hoping I can program them with our Bus Pirates, but I think they're all at the trampery :/
[14:48] <jcoxon> lilypad
[14:49] <juxta> jcoxon: lilypad 328? I was going to use the pro/pro mini 3.3v 8mhz 328 setting - any difference?
[14:53] <jcoxon> yeah they have crystals i thino
[14:53] <juxta> oh right
[14:53] <juxta> good point
[14:53] <jcoxon> http://www.arduino.cc/playground/Learning/Atmega83-3V
[14:53] <juxta> if you burn the bootloader from the arduino IDE, does that take care of setting the fuses too?
[14:53] <jcoxon> if you want burn it 'raw'
[15:02] <juxta> I'm off to bed, night all
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[15:56] <jcoxon> russss, with the apple monitor at the space is there also a cable?
[15:56] <russss> yeah
[15:56] <jcoxon> cool
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[21:05] <ProjectCirrus> I'm designing a circuit for my ntx2 transmitter and i'm wondering if anyone has any idea what voltages are required into its input to get the right frequency shift? also what shift is best, i;m tempted to stick with 170 hz... is there any reason 350 hz would be better?
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[21:10] <ProjectCirrus> anyone any ideas?
[21:11] <Randomskk> I believe the larger shift makes discrimination easier or at least more noise-immune?
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[21:11] Action: Randomskk hasn't actually used the NTX2, can't say for sure
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[21:12] <ProjectCirrus> I can see how it might help
[21:13] <ProjectCirrus> does anyone know the "proper" way to tune the system
[21:13] <SpeedEvil> why 170hz?
[21:14] <ProjectCirrus> no idea :) just think I saw it in dlfldigi as the default
[21:14] <SpeedEvil> Apply a demodulator to the output of a radio at a suitably large distance, and see what SNR is
[21:16] <ProjectCirrus> as far as the actual circuit goes i'm just using a potential divider with a transistor switch from the computer to control the voltage going into the ntx2 chip, is this the normal way of doing it or is there a better way?
[21:17] <SpeedEvil> Well - if the tuning span is - say - 3V, and that leads to 10KHz - then the to get 170hz - 10000/170 = 3V/?
[21:17] <SpeedEvil> that works.
[21:18] <ProjectCirrus> ok, so just a linear response
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[21:39] <Laurenceb> its fairly linear
[21:39] <Laurenceb> Randomskk: ping
[21:40] <ProjectCirrus> Am I right in saying that i need to vary between something like 1.2v dc and 1.8v dc on the input pin to transmit the rtty correctly... obviously it will need fine tuned but is the principle correct?
[21:40] <Laurenceb> ProjectCirrus: its pretty linear around the midpoint, certainly if you keep to a couple of hundered Hz shift
[21:40] <natrium42> Laurenceb, when are you launching that radio transmitter?
[21:40] <Laurenceb> yeah
[21:41] <Laurenceb> as soon as I have something to stick it to
[21:41] <Laurenceb> I dont really trust it
[21:41] Action: SpeedEvil passes Laurenceb a duck.
[21:41] <Laurenceb> on its own
[21:41] <Laurenceb> lol
[21:41] <Laurenceb> Natrium42: any chance of some IMU data?
[21:41] <natrium42> launch first, then data :D
[21:41] <Laurenceb> just hook it up to a terminal and move it about a bit - thats all
[21:41] <Laurenceb> heh
[21:42] <natrium42> need to find a usb-to-serial converter
[21:42] <Laurenceb> k
[21:42] <natrium42> dunno where they all went
[21:42] Action: Laurenceb is still working on the schematic for his autopilot board
[21:42] <Laurenceb> keeps gaining more features - adding RS485 now
[21:44] <SpeedEvil> why?
[21:44] <SpeedEvil> those fancy servos?
[21:44] <Laurenceb> yes
[21:44] <Laurenceb> also moving to 48 pin stm32
[21:44] <SpeedEvil> hot wire i/f?
[21:44] <Laurenceb> so it can have 4 channels of independant pwm in and out
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[21:44] <natrium42> Laurenceb, did you ever finish that 10 degree horizon formula?
[21:45] <Laurenceb> hot wire will be on the I2C bus
[21:45] <SpeedEvil> ah
[21:45] <Laurenceb> yes, its on the wiki
[21:45] <natrium42> oh?
[21:45] <Laurenceb> check the .xls, I modified it
[21:45] <Laurenceb> SpeedEvil: also, hot 0603 PRT, not hot wire
[21:45] <Laurenceb> natrium42: so you can enter any horizon angle
[21:46] <natrium42> Laurenceb, could you link me please?
[21:46] <natrium42> i don't see any changes made by you on the wiki
[21:48] <Laurenceb> arg
[21:48] <Laurenceb> cant find the xls now
[21:50] <natrium42> :S
[21:52] <Laurenceb> RocketBoy: where is your horizon spreadhsste on the wiki?
[21:53] <Laurenceb> http://ukhas.org.uk/communication:lineofsight?s=line%20sight
[21:53] <Laurenceb> finally
[21:53] <natrium42> oh, sweet
[21:57] <natrium42> i'll probably use 5 degrees, not 10
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[22:01] <rjharrison> evening all
[22:02] <natrium42> hi
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[22:20] <Laurenceb> grrr Falcom wont respond to emails
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[22:40] <Randomskk> Laurenceb: sorry back
[22:40] <Laurenceb> hi
[22:41] <Laurenceb> I'm working on autopilot board
[22:41] <Laurenceb> going for 48 pin
[22:42] <Laurenceb> stm32, as it needs more io
[22:42] <Laurenceb> I'm adding rs485
[22:45] <Laurenceb> I'll setup a github account, are you still interested in collaberating?
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[22:46] <Laurenceb> guess I'm maybe workinjg towards something that has a bit more interface wise
[22:46] <Laurenceb> than you're thinking of
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[22:52] <Randomskk> Laurenceb: sorry a bit busy, but add me on github (randomskk) at any rate - I may have a look through we are doing slightly different things
[22:52] <Randomskk> a lot of code'd probably be compatible regardless though
[22:52] <Randomskk> anyway bbl
[22:56] <Laurenceb> yeah
[22:56] <Laurenceb> me too, cya
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[00:00] --- Wed Mar 3 2010