highaltitude.log.20091128

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[09:36] <RocketBoy> morning
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[09:44] <rjharrison_> ping RocketBoy
[09:44] <rjharrison_> Just a quick question
[09:45] <rjharrison_> Do you think I'm better taking the audio out of RX and processing from there
[09:46] <rjharrison_> I can't really see how I can pull the data from the DataOut pin unless I plan to use the rates specified by RM
[10:25] <rjharrison_> I'm getting a few harmonics through from the RX http://www.robertharrison.org/images/rtty/fldigi.jpg
[10:25] <rjharrison_> Is this typical
[10:25] <rjharrison_> It looks bad
[10:59] <RocketBoy> rjharrison_: if you are using the data out and feeding that into the PC audio in of fldigi then thats wrong - you want to be taking the audio out and feeding that into the PC audio in
[10:59] <juxta> evening all
[10:59] <RocketBoy> (that does look bad)
[11:03] <RocketBoy> are you using two tones with a 350Hz shift - 50baud data?
[11:23] Nick change: RocketBoy -> RocketBoy|Away
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[11:36] <juxta_> wow - I just got an email from VK5ZAI offering to help with tracking of my payload - looks like he has a pretty amazing setup :D
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[15:44] <DanielRichman> ping sbasuita
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[18:09] <rjharrison_> RocketBoy|Away I am using audio out into fldigi
[18:09] <rjharrison_> Will try to improve it might be the pwm
[18:10] <rjharrison_> I push it to 8MHz rather than the internal 1MHz
[18:21] <gordonjcp> rjharrison_: oh cool, you got your 2e0?
[18:22] <gordonjcp> when did you do that?
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[18:44] Nick change: natrium_ -> natrium42
[18:45] <sbasuita> DanielRichman, why did you sleep today away man?
[18:46] <DanielRichman> sbasuita, because i was tired
[18:46] <DanielRichman> sbasuita, sorry but... i woke up and it was already getting dark so i just didn't bother
[18:46] <sbasuita> ...
[18:46] <natrium42> hey guys
[18:46] <DanielRichman> hey natrium42
[18:46] <natrium42> did you build the red nose yet?
[18:46] <DanielRichman> sbasuita, what happening tomorrow?
[18:46] <sbasuita> DanielRichman, nothing atm
[18:46] <DanielRichman> natrium42, not yet, no
[18:47] <DanielRichman> sbasuita, can we rangetest tomorrow?
[18:47] <sbasuita> DanielRichman, need an antenna
[18:47] <DanielRichman> sbasuita, arrgh. We need to build a yagi
[18:47] <sbasuita> DanielRichman, moxon will do
[18:48] <DanielRichman> yagi... moxon... whatever, either way we don't even have any metal for the elements, sbasuita
[18:48] <DanielRichman> where're we gonna get element metals
[18:48] <DanielRichman> natrium42, that's top priority though. Either will be a red nose or a small santa figure
[18:48] <natrium42> :D
[19:11] <RocketBoy|Away> rjharrison_: I understand - it could be artifacts of the PWM - when you say 1MHz do you mean that is the input frequency of PWN
[19:11] <RocketBoy|Away> PWM counter?
[19:12] <RocketBoy|Away> like if the PWM was 8 bits then the PWM frequency would be 3.9KHz (i.e. 1MHZ / 256)
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[21:19] <jcoxon> evening
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[22:36] <Laurenceb> hi
[22:37] <SpeedEvil> hi
[22:37] <natrium42> hi
[22:37] <jcoxon> hi
[22:37] <Randomskk> hi
[22:37] <Randomskk> jcoxon: you need to make your name longer apparently
[22:37] <Randomskk> :p
[22:38] Nick change: jcoxon -> jcoxonnnn
[22:38] <jcoxonnnn> hi
[22:38] <Randomskk> hi
[22:38] <Randomskk> :D
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[22:48] <jonsowman> hi all
[22:48] <Randomskk> hi
[22:49] <sbasuita> ohai
[22:49] <sbasuita> gah :(
[22:49] <sbasuita> watching paranormal activity
[22:50] <Randomskk> oh man, there's a week until my full radio test
[22:50] <Randomskk> I really need to revise that stuff
[22:50] <Randomskk> sbasuita: is it good?
[22:50] <sbasuita> Randomskk, like blair witch to the next level
[22:50] <sbasuita> just paused it
[22:50] <Randomskk> jonsowman and I were considering going to see it at some point or something
[22:50] <sbasuita> dunno if i can take another night :S
[22:50] <Randomskk> sounds scary
[22:50] <sbasuita> i guess it isn't as scary if you watch it with somebody else
[22:50] <sbasuita> its that sort of film
[22:50] <Randomskk> or with the sound off? :P
[22:51] <Randomskk> fair enough
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[23:20] <Laurenceb> http://www.maxim-ic.com/quick_view2.cfm/qv_pk/5928
[23:20] <Laurenceb> ^ looks good for a usb scanner type device
[23:20] <Laurenceb> I think it can be made to operate from 24MHz to 1.1GHz
[23:23] <Laurenceb> not sure about overlapping the IF and the RF input
[23:30] <Laurenceb> but otherwise its pretty neat - beats an Icom in all respects apart from low frequency reception
[23:31] <Laurenceb> jcoxonnnn: how goes the level sensor?
[23:31] <Laurenceb> oh and did you get a pump?
[23:33] <jcoxonnnn> Laurenceb, have the pump
[23:33] <jcoxonnnn> and the level sensor is working
[23:33] <Laurenceb> nice stuff
[23:33] <jcoxonnnn> going to make a new ballast tank as this one is a bit dead now
[23:33] <jcoxonnnn> being the prototype and all
[23:33] <Laurenceb> one thing to consider - you wont be able to get much suction at low pressure
[23:34] <jcoxonnnn> this pump is quite meaty
[23:34] <jcoxonnnn> a bit heavy but will get the job done
[23:34] <Laurenceb> how heavy?
[23:35] <jcoxonnnn> haven't weighed it
[23:35] <Laurenceb> I guess we have to think about it as a fraction of 5Kg or whatever the transatlantic will weigh
[23:35] <jcoxonnnn> yes thats true
[23:35] <jcoxonnnn> it could be made lighter - if a success we could get them to make us something custom
[23:35] <Laurenceb> and I bet some of those metal brackets could come off
[23:36] <jcoxonnnn> its from a small outfit in the UK so the might be keen to help out
[23:36] <Laurenceb> yeah worth a try
[23:36] <Laurenceb> you were thinking of going for 11Km cruise right?
[23:37] Action: Laurenceb is trying to work out if its sensible to try sucking the ballast out of the tank
[23:37] <jcoxonnnn> for trans-a?
[23:37] <Laurenceb> yes
[23:37] <jcoxonnnn> yeah
[23:37] <jcoxonnnn> i've got a air entry at the moment at the top
[23:38] <Laurenceb> http://www.wolframalpha.com/input/?i=air+pressure+at+11Km+in+meters+of+water
[23:42] <Laurenceb> http://www.wolframalpha.com/input/?i=(air+pressure+at+20Km+in+meters+of+water)*(density+of+ethanol)%2F(density+of+water)
[23:42] <Laurenceb> that should be ok for one of the large coke bottles
[23:45] <Laurenceb> http://www.wolframalpha.com/input/?i=(ethanol+vapour+pressure+at+-20C)+%2F+(air+pressure+at+20Km)
[23:46] <Laurenceb> you arent in much danger of the ethanol boiling off - I made it 20Km for good measure
[23:47] <jcoxonnnn> oh thats good
[23:47] <jcoxonnnn> that was a slight concern
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[23:53] <jcoxonnnn> Laurenceb, which led should i get:
[23:53] <jcoxonnnn> http://www.maplin.co.uk/Search.aspx?criteria=ir+led&source=15&menul1=1692&menul2=12420
[23:53] <jcoxonnnn> will get it tomorrow morning
[23:55] <Laurenceb> the high power one I guess
[23:55] <Laurenceb> careful not to fry the IO pin your using
[23:55] <jcoxonnnn> at 3.3v?
[23:55] <Laurenceb> limit it to <20ma
[23:55] <Laurenceb> yes
[23:56] <Laurenceb> unless you want to rig up a transistor and use the full 100ma
[23:57] <jcoxonnnn> hmmm my local one doesn't stock it
[23:57] <jcoxonnnn> will see what tehy have
[23:58] <jcoxonnnn> might get a selection
[00:00] --- Sun Nov 29 2009