highaltitude.log.20091219

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[01:41] <juxta> hi all
[01:42] <juxta> I'm trying to make sense of some airspace charts I have, anybody know what HJ or H24 mean in terms of airspace activity?
[01:42] <juxta> I guess H24 is 24 hours a day
[01:42] <juxta> but i don't know H7
[01:42] <juxta> sorry, HJ
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[01:47] <juxta> ah, HJ is operation during daylight hours
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[04:44] <bittwist> http://tinyurl.com/yfoytsg
[05:03] <juxta> bittwist: that looks neat :)
[05:04] <bittwist> i enjoyed the video and liked the price point
[05:04] <bittwist> so i passed it on to a few channels here
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[09:19] <jcoxon> morning all
[09:22] <jcoxon> any french speakers on here right now?
[09:41] <jcoxon> bbl
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[11:24] <jcoxon> my faith in royal mail has been restored
[11:24] <SpeedEvil> ?
[11:25] <SpeedEvil> u haz payload?
[11:25] <jcoxon> no
[11:25] <jcoxon> i ordered some radiometrix modules yesterday
[11:25] <SpeedEvil> ah
[11:25] <jcoxon> phoned up to pay at 3.30 pm
[11:25] <jcoxon> they arrived this morning
[11:25] <SpeedEvil> neat
[11:26] <jcoxon> i've also realised that price wise nothing beats teh ntx2
[11:26] <jcoxon> was looking into using a different module for my backup beacon on BH4 - they wanted ?25 for it while a ntx2 costs ?13
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[11:49] <junderwood> jcoxon, RocketBoy I notice there was some discussion while I was away last night about checksums on telemetry data.
[11:49] <jcoxon> junderwood, yes
[11:49] <jcoxon> general debating
[11:49] <jcoxon> :-)
[11:49] <junderwood> A 16 bit checksum is already implemented in the tracker and was used for the CUSF flight a few weeks ago
[11:50] <jcoxon> is it CRC?
[11:50] <junderwood> It's the algorithm used for TCP/IP checksums. Very easy to implement
[11:51] <jcoxon> oh right
[11:51] <junderwood> not sure whether Rob put the code on the Wiki
[11:51] <jcoxon> i don't think he has but i can ask him to
[11:51] <russss> is the tracker code open-source?
[11:51] <jcoxon> i think the best solution is to provide all options
[11:52] <jcoxon> russss, the web page side is on the wiki
[11:52] <jcoxon> the server backend is probably but as its constantly being changed rob hasn't got round to packaging it up
[11:52] <jcoxon> junderwood, perhaps a new part of the payload xml file that defines which method of checksum you are using
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[11:53] <junderwood> may already be there.
[11:53] <russss> I was wondering if we could have a simple TCP service which just spits out the raw data as it receives it from listeners
[11:53] <jcoxon> wasn't there last time i checked
[11:53] <russss> I guess I could just poll the raw list but that's a bit ugly
[11:54] <jcoxon> russss, well its going into a mysql database
[11:54] <jcoxon> so perhaps we should provide a raw stream out
[11:55] <junderwood> Checksum type is not in the xml. I think it looks at the number of checksum digits to decide whether it's 8 or 16 bit
[11:55] <jcoxon> yeah, well it would be sensible to implment that in the xml - rob is moving house this weekend so something to do after christmas methinks
[11:55] <junderwood> It's easy enough to poll the raw list but you need an intelligent client which doesn't download the whole page every time.
[11:57] <jcoxon> do pass on any suggestions to improve the system to natrium, rjharrison and me
[11:57] <jcoxon> and everyone is welcome to get involved
[11:58] <junderwood> jcoxon, just e-mailed my complete fldigi log from the other day. Should fill in some gaps. Enjoy!
[11:58] <jcoxon> ooo thanks
[11:58] <junderwood> :-)
[11:59] <russss> junderwood: oh, will the backend be sensible if I use content-range? That's the easy answer I guess
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[11:59] <junderwood> not sure I understand the question
[11:59] <junderwood> ah. Yes I do!
[12:00] <junderwood> Yes. You can use content-range to get the bit you want.
[12:00] <junderwood> First query the header to find out how long the page is. Then just grab the new bits
[12:01] <russss> cool, that should do. Although a "push" service would be ideal
[12:01] <jcoxon> junderwood, ooo you got some of hte float data, great
[12:01] <junderwood> .. or direct access to the sql server :->
[12:02] <junderwood> Glad to help. My client was sulking and not uploading data for quite a while. I've got a bit of debugging to do
[12:02] Action: russss would recommend feeding it onto http://www.rabbitmq.com/ ;)
[12:03] <russss> it would be nice to have a "raw" feed, and a feed with checksum failures removed too.
[12:04] <jcoxon> russss, i'm sure thats easy to sort out
[12:04] <jcoxon> just chat with rob
[12:04] <jcoxon> right bbl
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[12:07] <russss> I might just poll the feed for the moment and then play with some of the stuff myself.
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[12:08] <Rocketboy> New stuff up on UKHAS FreeCycle:- http://ukhas.org.uk/misc:ukhas_freecycle
[12:09] <Rocketboy> bbl
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[12:29] <Laurenceb> http://www.steorn.com/
[12:29] Action: Laurenceb facepalm
[12:30] <Laurenceb> also on livestream - http://www.livestream.com/steorn
[12:47] <SpeedEvil> Lookat the shiny orbs!
[12:53] <gordonjcp> oh man
[12:53] <gordonjcp> ZOMG FREE ENERGY!
[12:54] <gordonjcp> all you have to do is wire it to this car battery and you'll get 12 volts out of it, for several hours at a couple of amps!
[12:54] <gordonjcp> and the amazing thing is, if you use a lorry battery it lasts even longer!
[12:55] <SpeedEvil> That's a lorra lorra amps.
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[17:36] <edmoore> G8DSU_: hi
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[17:47] <G8DSU_> Hi Ed
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[18:17] <edmoore> G8DSU_: sorry for my slow reply, my irc client didn't ping. I was just wondering - google suggests ou're into ATV?
[18:19] <G8DSU_> Yes, though not very active on ATV or AMSAT. What little free time I have tends to be taken up with caver radio& electronics (CREG) stuff
[18:21] <edmoore> cool. It seems technology and caving go hand in hand. I was in our local in cambridge when the caving soceity came in, and their club t-shirt had an XKCD style, caving themes joke cartoon about operating systems on it.
[18:22] <edmoore> i was wondering about 10mW and ATV
[18:23] <edmoore> how much gain you'd need to get a decent image over say 100km with a 10mW tx
[18:23] <G8DSU_> Yes, a very hostile environment for electronics, so a lot of fun making stuff work. also some interesting communications challenges.
[18:25] <G8DSU_> Live TV would be a real challenge but SSTV should be do-able - though probably *very* slow scan TV. Would be good to see images whilst in flight though...
[18:26] <edmoore> sure, sstv has been done :) it would be interesting to see just how much gain you'd need for ATV
[18:26] <edmoore> jcoxon/rocketboy did sstv last year on pegasus 6 (iirc)
[18:35] <G8DSU_> Well, need to use every trick in the book to reduce b/w and this may be a challenge unless camera is v.stable. What I've seen of balloon-borne video is highly unstable. This will reduce your compression choices.
[18:36] <G8DSU_> Ed - sorry gtg but will be back later. Catch you then maybe?
[18:42] <RocketBoy> edmoore: if your interested in doinging fast scan TV on 2.4GHz then I have one of these you can borrow: http://www.rigpix.com/atv/comtech_fm2400rtim8.htm
[18:44] <RocketBoy> sensitivity is typically -83dBm
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[18:45] <RocketBoy> probably can improve on that by a few dBs by a preamp
[19:19] <RocketBoy> assuming the preamp can improve sensitivity to -90dBm and 10mW EIRP Tx - thats 100dB - pathloss is 140dB over 100Km at 2.4GHz - so the RX antenna would need to be +40dBi - or about 5m dia - 3db beamwith is about 2 degrees
[19:19] <RocketBoy> (dish)
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[22:35] <pooooponme> i was thinking of taping some cardboar where the air comes out of a blown up balloon.. will this keep it straight?
[22:36] <pooooponme> i know it's a silly question, but i'm trying to get to go straight up like a rocket
[22:36] <pooooponme> for the fun of it
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[22:49] <Laurenceb> hi
[23:08] <sbasuita> evening Laurenceb
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[00:00] --- Sun Dec 20 2009