highaltitude.log.20090821

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[00:13] <Laurenceb> can anyone explain supersonic drag coefficient calculations for me?
[00:14] <Laurenceb> why do you still have a drag coefficient when you lose energy due to the shock wave?
[00:14] <Laurenceb> - why is it dependant on area
[00:14] <Laurenceb> doesnt any object create a shock wave?
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[00:23] <SpeedEvil> Sure - but the magnitude of the shock - the total energy going into it - is proportional? to the area
[00:23] <SpeedEvil> And you don't lose energy due to the shockwave
[00:23] <SpeedEvil> the shockwave is a manifestation of the loss of energy.
[00:24] <Laurenceb> hmm
[00:24] <SpeedEvil> AIUI anyway
[00:24] <Laurenceb> but why wont a small particle create an identical shockwave?
[00:25] <SpeedEvil> It does - but the scale is smaller
[00:25] <Laurenceb> hmm I guess
[00:26] <SpeedEvil> If you have 10J/s being dissipated as a shock wave from a microscopic pellet - vs 10GJ/s from a huge rocket - the scales will differ somewhat
[00:27] <SpeedEvil> You're I assume trying to work out shapes?
[00:27] <SpeedEvil> and drag coefficients for your thingy?
[00:28] <Laurenceb> yeah
[00:38] Action: SpeedEvil is reminded of http://www.amazon.co.uk/Seekers-Bane-P-C-Hodgell/dp/1439132976/ref=wl_it_dp_o?ie=UTF8&coliid=I344JPEEL7WHUA&colid=2Z7VPRZQTQ57V on my wishlist
[00:38] <SpeedEvil> oops
[00:38] <SpeedEvil> http://www.amazon.co.uk/Hypersonic-High-Temperature-Dynamics-Second-Education/dp/1563477807/ref=wl_it_dp_o?ie=UTF8&coliid=I2UADHYLQZ560O&colid=2Z7VPRZQTQ57V
[00:48] <Laurenceb> I was thinking of using titanium 5 alloy for the tip
[00:48] <Laurenceb> is reasonably cheap
[00:49] <Laurenceb> http://www.aiaa.org/content.cfm?pageid=406&gTable=mtgpaper&gID=92899
[00:49] <SpeedEvil> Why?
[00:50] <SpeedEvil> the heatload may be large - but it's over so fast
[00:51] Action: SpeedEvil wishes that he had an academic IP
[00:51] <Laurenceb> yeah I'm still not convinced kapton film over balsa would hold
[00:51] <Laurenceb> I cant see that either annoyingly
[00:51] <SpeedEvil> the bulk of the heatload is over what - a second?
[00:51] <Laurenceb> it looks like a useful paper
[00:51] <Laurenceb> 5
[00:51] <SpeedEvil> that long?
[00:51] <SpeedEvil> oh
[00:51] <Laurenceb> maybe 4
[00:52] <SpeedEvil> yeah - you're also speeding up at a similar rate to that which the atmosphere is spinning
[00:52] <SpeedEvil> so it's slightly more linear than my initial estimate
[00:52] <Laurenceb> last secod or so of burn then until you start reaching lower density atmosphere
[00:52] <SpeedEvil> Umm...
[00:53] <SpeedEvil> What's the comparable speed of normal stuff - say the shuttle - at that alt?
[00:53] <Laurenceb> a bit less I think
[00:53] <Laurenceb> stagnation temp is ~ 5000C
[00:55] <Laurenceb> I used some rough data from sutton in my sim code
[00:56] <Laurenceb> drag coefficient tends down to 0.45 at hypersonic
[00:56] <Laurenceb> but some data Ive found around suggests lower - 0.3
[00:56] <Laurenceb> I think sutton assumes a rather poor attempt at a nosecone
[00:58] <Laurenceb> dont you have to ensure the shock wave doesnt hit the body lower down?
[00:58] <Laurenceb> so a half angle of atan(1/mach no)
[01:00] <SpeedEvil> I think so
[01:00] <Laurenceb> http://www.thefintels.com/aer/prelude.htm
[01:00] <SpeedEvil> But my hypersonic aerodynamics is rusty
[01:01] <Laurenceb> tends to 0.3
[01:04] <Laurenceb> and it has fins
[01:06] <Laurenceb> a 1.9Kg GLOW would probably work fairly easily if its that low drag
[01:14] <SpeedEvil> I wonder how much a test shot - say a mockup of the size with a shorter burning engine and no second stage would be.
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[02:21] <Laurenceb> YOU HAVE TO
[02:21] <Laurenceb> oops
[02:22] <natrium42> OHAI LAURENCE
[02:30] <Laurenceb> lol
[02:30] <Laurenceb> if not just to ensure it meets the cost limit
[02:31] <Laurenceb> as the platform is reusable
[02:31] <Laurenceb> gtg
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[13:32] <RocketBoy> is it launched yet?
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[14:13] <rjharrison> any news
[14:17] <rjharrison> Ed's just messing about apparently should be up soon
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[14:17] <rjharrison> Ed's just messing about apparently should be up soon
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[14:20] <rjharrison> g8khw-iPhone did you get that
[14:20] <g8khw-iPhone_> What
[14:20] <edmoore> ok we're just getting ready to leaving the dpeartment, after a short delay
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[14:23] <g8khw-iPhone_> Ok - I'm in the workshop - so give me a 5 min launch warning
[14:25] <rjharrison> Ok if I get wind of that I'll give you a txt
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[14:26] <SpeedEvil> woo!
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[14:33] <edmoore> it's not going high chaps
[14:33] <edmoore> only a 250g balloon
[14:33] <edmoore> should break 20km though
[14:33] <rjharrison> oh so long distance?
[14:33] <rjharrison> or do you want o get it back now
[14:34] <rjharrison> http://www.robertharrison.org/mobile.php
[14:34] <rjharrison> for all you phone people out ther
[14:34] <rjharrison> there
[14:36] <SpeedEvil> np: Europe - The Final Countdown.
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[14:38] <djellison> Looking at the predict, do you have anything dutch, usic wise?
[14:38] <djellison> music, even.
[14:39] <rjharrison> DanielRichman R U going to be monitoring?
[14:40] <DanielRichman> rjharrison, ping sbasuita
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[14:59] <rjharrison> Oh yep he's got JC radio
[15:17] <rjharrison> I'm going to go home to monitor
[15:17] <rjharrison> bbiab
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[15:41] <fnoble> hi
[15:41] <fnoble> its badgercubs maiden voyage
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[15:43] <SpikeUK> fnoble - please could you give the watching public a quick "heads up" on the telemetry settings for this mission. Ta
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[15:55] <edmoore> badgercub is up
[15:56] <djellison> 434.650MHz or 434.075MHz
[15:56] <DanielRichman> up, up and away?
[15:57] <edmoore> 434.522
[15:57] <edmoore> ok back online soon
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[16:00] <russss> I need to get me a radio
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[16:03] <SpikeUK> I can hear a brief burst of something every three seconds - anything to do with Badger Cub?
[16:07] <djellison> 434.522 LSB ? I'm still at work but I'll have a listen on my whip
[16:08] <junderwood> OK. Starting to get some data in Bicester
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[16:10] <RocketBoy> I can just hear/see RTTY in the noise
[16:11] <SpikeUK> junderwood - shift, baud? please
[16:12] <junderwood> RTTY, 350 Hz, 50baud, 7,n,2
[16:12] <SpikeUK> ta!
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[16:17] <SpeedEvil> Once there is a decent signal - and you can demodulate it - can someone record a short segment for the 'beginning' page? Also - can you try switching over to FM - and recording a bit in that mode - to see if the data can be picked out of the recording. (it will sound like a low rough buzzing I suspect) I've been wondering for a while if this is possible - it'd be nice - as it'd mean FM recievers were a valid option (though not as good for many
[16:19] <RocketBoy> woo - starting to get telemetry: $,BATGERCUB,3,15:18:29,52.2714,48=8,4515,10,-72.7,35
[16:20] <SpeedEvil> :)
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[16:22] <rjharrison_home> hey r we up
[16:22] <rjharrison_home> any news
[16:22] <SpeedEvil> RocketBoy: woo - starting to get telemetry: $,BATGERCUB,3,15:18:29,52.2714,48=8,4515,10,-72.7,35
[16:22] <rjharrison_home> freq
[16:23] <rjharrison_home> SpeedEvil any idea how long up in the air
[16:23] <SpeedEvil> edmoore: 434.522
[16:23] <SpeedEvil> nope
[16:23] <rjharrison_home> legal freq?
[16:23] <SpeedEvil> ?
[16:24] <rjharrison_home> ok
[16:24] <rjharrison_home> I'll get the listener working
[16:25] <rjharrison_home> Can someone paste the correct telemetry string
[16:25] <rjharrison_home> a complete one :)
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[16:25] <rjharrison_home> hey ed
[16:26] <rjharrison_home> Can you paste a full telmetry string
[16:26] <edmoore> hi
[16:26] <edmoore> ok
[16:26] <edmoore> back on the roof through wifi
[16:28] <edmoore> $$BADGERCUB,295,14:57:39,52.2199,0.1556,1774,10,-74.0-38
[16:29] <SpeedEvil> underfilled ish?
[16:29] <SpeedEvil> 1m/s ascent?
[16:29] <edmoore> it's a tiny wee balloon
[16:29] <SpeedEvil> ah
[16:30] <edmoore> 250g
[16:30] <SpeedEvil> Don't most use helium?
[16:30] <SpeedEvil> Sorry :)
[16:30] <rjharrison_home> lol
[16:31] <SpikeUK> Took me a moment ;-)
[16:31] <edmoore> who is listning?
[16:32] <edmoore> infact rjharrison_home what's the link I need for the map?
[16:34] <RocketBoy> I'm listening - but dlfldigi doesn't log to the server on vista
[16:34] <edmoore> we'll get this end uploading to the server
[16:35] <SpikeUK> SpikeUK listening but not hearing a lot in Weybridge
[16:35] <djellison> Is it me - or is the predict slightly, errr, moist?
[16:36] <RocketBoy> looks good to me - just NE of Bury-St-edmonds at the mo
[16:36] <edmoore> we're just right up on the deck here at the eng department with no wifi. amazing view though!
[16:36] <RocketBoy> just above 7000m
[16:37] <edmoore> RocketBoy: are you uploaing to the DL? can't see you on the raw strings
[16:37] <RocketBoy> no - cos no-one has fixed vista fldigi for me (hint hint)
[16:38] <edmoore> ah bum fluff
[16:38] <edmoore> RocketBoy: think of a short and witty message please :)
[16:38] <SpikeUK> "Bang goes *that* theory"?
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[16:40] <rjharrison_home> Ok all loggers please selecte the badgercub xml file
[16:40] <rjharrison_home> and the data will be logged to the tracker
[16:41] <edmoore> At the moment we're just dropping the TX power down and seeing if it still works
[16:41] <rjharrison_home> hehe
[16:41] <rjharrison_home> 2way
[16:41] <edmoore> then we'll take requests
[16:41] <rjharrison_home> :)
[16:42] <rjharrison_home> BTW I'm receiving here in yorkshire
[16:42] <SpikeUK> Erm . where do we get the badgercub xml file from please?
[16:45] <SpikeUK> Ar. http://www.robertharrison.org/listen
[16:50] <rjharrison_home> RX ECHO: 50% power
[16:51] <rjharrison_home> What is 100%
[16:51] <rjharrison_home> If you are using dlfldigi then your know what |I mean if not
[16:51] <edmoore> 30W
[16:52] <rjharrison_home> http://www.robertharrison.org/tracker/
[16:52] <rjharrison_home> Ok edmoore cool
[16:53] <edmoore> we're just playing basically with antenna and power combos. it seems robustish
[16:54] <DanielRichman> rjharrison_home, will the raw data include the RX Echos? If so, is there a URL where that can be seen?
[16:55] <edmoore> SpikeUK and RocketBoy: you asked for 'Bang goes *that* theory'
[16:55] <edmoore> have a listen
[16:56] <junderwood> Would that be "Bag gnes *tha4: theory"?
[16:56] <edmoore> if you have poor RX, yes
[16:56] <SpikeUK> Thanks - not a sniff of a sig here sadly - but thanks!
[16:56] <junderwood> :-)
[16:57] <DanielRichman> badger badger badger badger badger badger mushroom mushroom?
[16:57] <SpikeUK> Scout!!!!
[16:57] <RocketBoy> he he - its just passing over a bloodhound http://www.panoramio.com/photo/4559914 - shall i launch it?
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[16:59] <SpikeUK> RocketBoy - do your bets
[16:59] <SpikeUK> bets = best ;-)
[16:59] <DanielRichman> How hard do you reckon it would be to shoot down a hab
[17:00] <DanielRichman> perhaps we could have a big phototransistor/LDR on the bottom of the payload, and you have to hit it with a laser, and it'll cutdown
[17:00] <DanielRichman> or could use rockets.
[17:02] <rjharrison_home> Its about to hit the coast
[17:03] <rjharrison_home> http://www.robertharrison.org/tracker/
[17:05] <rjharrison_home> Calling all loggers please update to badgercub xml
[17:05] <rjharrison_home> tracking at http://www.robertharrison.org/tracker/
[17:05] <edmoore> rjharrison_home: where do i find badgercub xml?
[17:06] <rjharrison_home> in the misc section of dlfldigi menu
[17:06] <rjharrison_home> dlclient menu
[17:07] <rjharrison_home> select badgercub and hey presto
[17:07] <chrisfoote> Source is > http://www.robertharrison.org/listen/
[17:08] <rjharrison_home> chrisfoote that is no good to anyone though
[17:08] <chrisfoote> Oh - sorry!
[17:08] <rjharrison_home> http://www.robertharrison.org/tracker/
[17:08] <rjharrison_home> to watch
[17:09] <rjharrison_home> and then you need a custom fldigi client to decode and log
[17:09] <rjharrison_home> see wiki
[17:10] <chrisfoote> I have chrisfoote = SpikeUK on other pc ;-)
[17:17] <edmoore> hi rjharrison_home
[17:17] <rjharrison_home> .
[17:19] <rjharrison_home> hehe there is always a second chance
[17:19] <rjharrison_home> Can you make it send anything?
[17:21] <russss> how far do you expect to be able to track it out to sea?
[17:22] <chrisfoote> Last update timed 16:16:30 on http://www.robertharrison.org/tracker/
[17:25] <chrisfoote> Thanks
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[17:27] <rjharrison_home> 1/2 way to the neatherlands
[17:27] <djellison> So when I said "Is it me - or is the predict slightly, errr, moist?".....
[17:29] <rjharrison_home> no checksum
[17:30] <chrisfoote> djellison - you were right
[17:30] <SpeedEvil> djellison: it's expected to splasy
[17:31] <djellison> Never know - a stag do returning on a ferry from Zebrugge might pick it up
[17:31] <edmoore> if you uplink 'by the power of grayskull' it responds with 'I HAVE THE POWER!!!'
[17:32] <jontyw> edmoore, are you serious?!
[17:32] <edmoore> take a look at the logs
[17:32] <edmoore> :)
[17:33] <edmoore> it means we know the entire string has been sent correctly
[17:33] <edmoore> if you send it 'Your mum' it responds 'No! YOUR mum!'
[17:33] <djellison> Heman....but, you guys are too young to be 80's kids :O
[17:34] <RocketBoy> and burst is at 20,000m ?
[17:34] <edmoore> ish
[17:34] <edmoore> no djellison i loved HeMan
[17:34] <edmoore> i used to scream ' i have the power' at the top of the stairs as a kid then throw myself down, wrapped in duvets
[17:34] Action: RocketBoy thinks (humm rather dubious)
[17:36] <djellison> 434.522 LSB - (although my brain is shouting ABOVE 10 MEG SHOULD BE USB in a foundation revision sort of way) - not a sausage here
[17:38] <djellison> Can just hear it with the arrow, I think.
[17:38] <djellison> Going to get my netbook to listen to it.
[17:38] <SpeedEvil> to recap
[17:38] <SpeedEvil> Once there is a decent signal - and you can demodulate it - can someone record a short segment for the 'beginning' page? Also - can you try switching over to FM - and recording a bit in that mode - to see if the data can be picked out of the recording. (it will sound like a low rough buzzing I suspect) I've been wondering for a while if this is possible - it'd be nice - as it'd mean FM recievers were a valid option (though not as good for many
[17:41] <edmoore> it will just sound like a low buzzing yeah
[17:41] <edmoore> a 50hz square wave
[17:41] <edmoore> the information is presevred i think
[17:46] <djellison> I can hear it with the Arrow
[17:47] <SpeedEvil> I'm unsure if the information is preserved well - in the case of highpass filters that may cut out stuff under 300Hz
[17:48] <edmoore> SpeedEvil: sure, that's quite true in practice
[17:48] <edmoore> i was thinking in theory, but that doesn't really help
[17:49] <SpeedEvil> I'm just wondering how badly your average really cheap FM only scanner will work.
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[18:06] <hallam> hi folks
[18:06] Action: hallam just read the logs
[18:06] <hallam> congrats
[18:07] <hallam> edmoore, are you still getting telemetry? how far did the uplink work?
[18:07] <edmoore> yes
[18:07] <edmoore> 200km
[18:07] <edmoore> think we're having LOS issues a bit now
[18:07] <edmoore> it's at 20km
[18:08] <edmoore> uplink worked out to about 180, loosing characters now
[18:08] <edmoore> just adjusting yagi positioning
[18:08] <djellison> I could just hear some RTTY from here - but I'm too much of a idiot to get it to decode :)
[18:09] <djellison> I took the VHF elements of the arrow so I could stick it out an upstairs window with one arm :)
[18:09] <hallam> coming up on 200km distance, not bad
[18:10] <hallam> this is pretty impressive for a 250g balloon
[18:10] <hallam> what's the weather like today, cloudwise?
[18:10] <edmoore> pretty cloudy
[18:11] <edmoore> some nice looking cloud corridors around
[18:11] <edmoore> oh, we just got 200km uplink
[18:11] <hallam> :)
[18:12] <hallam> clouds make a big difference to the path loss I think
[18:13] <edmoore> agreed
[18:13] <edmoore> and we are really pretty close to the horizon
[18:18] <hallam> well done
[18:18] <hallam> what was up with the multiplication by 10 problem?
[18:20] <rjharrison_home> just updated the tracker
[18:21] <rjharrison_home> Been out for a bit and the rain storm blew the tripod over
[18:21] <rjharrison_home> Signal loud and clear here
[18:21] <rjharrison_home> $$BADOERCUB,641,17:20:59,52.7838,2.7768,23254,9,-72.5,-48
[18:22] <chrisfoote> rjharrison_home - how many listeners are logging?
[18:22] <rjharrison_home> chrisfoote http://www.robertharrison.org/listen/loggers.php
[18:23] <rjharrison_home> If you follow the link on the bottom the live ones are in green
[18:23] <edmoore> gosh it's going higher than expected
[18:24] <rjharrison_home> Yep
[18:24] <chrisfoote> rjharrison_home - thanks - just you then.
[18:24] <rjharrison_home> iphone users http://www.robertharrison.org/mobile.php
[18:24] <rjharrison_home> or any mobile device
[18:24] <hallam> edmoore: was it literally just badgercub + battery tied to the balloon?
[18:25] <edmoore> in a Gu box
[18:25] <hallam> pretty light then
[18:25] <edmoore> 230g
[18:25] <edmoore> inc parachute
[18:25] <edmoore> and string
[18:25] <hallam> I love the gu boxes, we get to eat ice cream every time we need a new payload housing
[18:25] <hallam> oh there was a chute
[18:25] <hallam> your least favourite chute I take it
[18:25] <rjharrison_home> chrisfoote there are 3 listeners
[18:25] <rjharrison_home> see bar at side of google maps
[18:26] <edmoore> yes, an old shit unstable one
[18:26] <rjharrison_home> edmoore any pics of the cub or payload
[18:26] <edmoore> i tried uploadign some stuff to flickr just now but it didn't want to play
[18:27] <rjharrison_home> Is the pause when you check for RX in
[18:27] <rjharrison_home> 25 k
[18:27] <rjharrison_home> 24k
[18:27] <chrisfoote> "bar at side of google maps"?
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[18:27] <hallam> http://maps.google.com/?q=http://www.robertharrison.org/listen/receivers.php&t=p
[18:28] <hallam> strange that G8KHW isn't showing up, his data is coming through at http://www.robertharrison.org/listen/data/data.txt
[18:28] <RocketBoy> so the uplink is FM? given the sharp cutoff
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[18:28] <hallam> it's OOK unless they changed something last night
[18:28] <RocketBoy> thats becuse the vist fldigi client is broken
[18:28] <RocketBoy> vista
[18:29] <rjharrison_home> RocketBoy you need to select badgercub from the drop down list
[18:29] <rjharrison_home> chrisfoote http://maps.google.com/?q=http://www.robertharrison.org/listen/receivers.php&t=p
[18:29] <rjharrison_home> The sidebar has 3 green top antenae
[18:30] <RocketBoy> yes - I have done - its not that
[18:30] <hallam> weird
[18:30] <chrisfoote> hallam & rjharrison_home - thanks. It's showing me as active (G8IPN/M) even though I've not heard a peep
[18:31] <chrisfoote> RocketBoy fldigi seems to be working on Vista for me
[18:31] <hallam> what are the ,-73.4,-50 at the end?
[18:32] <rjharrison_home> Well you have the client running
[18:32] <rjharrison_home> And linked to the tracker site
[18:32] <edmoore> low bit value and high bit value in dBm
[18:32] <rjharrison_home> It's doesn't mean you have sent data
[18:33] <hallam> woo 25km
[18:33] <rjharrison_home> I think it's been blown in the jets
[18:33] <rjharrison_home> change of direction
[18:33] <RocketBoy> chrisfoote: yeah I'm linked to the site too - but the data isn't getting throught
[18:34] <RocketBoy> through
[18:34] <hallam> RocketBoy, it gets put in data.txt, so it's getting at least partly through
[18:34] <hallam> what's the URL for the live map?
[18:35] <chrisfoote> RocketBoy - ok - thanks!
[18:36] <rjharrison_home> http://www.robertharrison.org/tracker/
[18:36] <rjharrison_home> hallam
[18:36] <hallam> thanks
[18:36] <rjharrison_home> I think it's going to be a floater
[18:38] <hallam> still 2m/s ascent
[18:39] <djellison> So - radio hams in Holland... Who knows some
[18:39] <edmoore> i don't think it'll float (hope not as it's going to get cold up here)
[18:39] <hallam> edmoore what was the predicted burst height?
[18:39] <edmoore> the last time we did this was with hallam, 3 years ago, when the cutdown failed and it went out to sea
[18:39] <edmoore> at this point we went to the pub and consoled ourselves
[18:40] <edmoore> 25-26km
[18:40] <natrium> djellison, might be worth it to ask in #hamradio
[18:40] <RocketBoy> yeaH - but it was an excellent range test
[18:41] <hallam> I guess it is now closer to Holland than Cambridge
[18:42] <hallam> only 90 mies from amsterdam
[18:42] <hallam> miles*
[18:42] <chrisfoote> rjharrison_home - what do you think the range is from you?
[18:42] <rjharrison_home> Nice clear signa;
[18:42] <rjharrison_home> l
[18:42] <rjharrison_home> Good question WF12 0NQ
[18:43] <djellison> 191km to Camb - 148 to Amsterdam
[18:43] <hallam> 310km to rjharrison_home
[18:44] <SpeedEvil> asked over in #hamradio?
[18:44] <SpeedEvil> oh
[18:45] <chrisfoote> 310km!! Good grief!
[18:45] <edmoore> burst
[18:45] <SpeedEvil> has anyone asked #hamradio - on the offchance?
[18:45] <SpeedEvil> oh
[18:46] <SpeedEvil> Maybe someones in a trawler :)
[18:46] <edmoore> 310km - not bad for 10mW!
[18:46] <rjharrison_home> 311.48
[18:46] <RocketBoy> tis comming down
[18:46] <rjharrison_home> :)
[18:46] <rjharrison_home> Yep
[18:47] <hallam> good job edmoore etc
[18:47] <hallam> bye bye badgercub
[18:47] <rjharrison_home> Drift has been good
[18:48] <rjharrison_home> how big is the chute
[18:48] <edmoore> huge for the payload
[18:48] <rjharrison_home> are we looking at a few more kms out on the way down
[18:48] <edmoore> yep
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[18:48] <djellison> II can hear it fine with F7e+Arrow
[18:48] <djellison> From Leics.
[18:49] <chrisfoote> Very well done guys!
[18:49] <rjharrison_home> Yep nice one CUSF a bit more gound breaking
[18:49] <rjharrison_home> and only a 7 quid radio module too
[18:50] <djellison> 264km for me
[18:51] <edmoore> djellison: can you decode?
[18:51] <chrisfoote> I should have an HB6CV by next time
[18:52] <edmoore> what's that?
[18:53] <chrisfoote> http://www.moonrakerukltd.com/Amateur-Radio/Beam-Antennas/HB9CV/HB9-70
[18:53] <djellison> Nah - tried - but chronic user error getting in the way. I'll have to shadow you guys next time around
[18:54] <edmoore> always welcome. the next one might be a bit more organized in that it won't be completely new and untested everything
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[18:55] <edmoore> just got a good uplink
[18:55] <edmoore> we think we had a dodgy co-ax extension lead this whole time
[18:55] <rjharrison_home> chrisfoote http://www.radioworld.co.uk/~radio/catalog/20909-tonna-70cm-440mhz-yagi-p-2321.html?osCsid=45f9557ddcb54961afd94c89353be7f0
[18:55] <hallam> haha
[18:55] <edmoore> it's coming through a lot clearer now we've switched to something else
[18:56] <hallam> nice
[18:56] <hallam> does it help with the uplink too?
[18:57] <chrisfoote> rjharrison_home oohh! Tonna!
[18:57] <ShellEvil> what's the EIRP used for transmission?
[18:57] <edmoore> chrisfoote: we have that tonna too
[18:57] <rjharrison_home> ERP
[18:58] <edmoore> we're using it now
[18:58] <rjharrison_home> Effective radiated power
[18:58] <rjharrison_home> mee too
[18:58] <edmoore> full power on the icom atm
[18:58] <edmoore> 30W
[18:58] <edmoore> have been using a lot less than that though
[18:58] <edmoore> just experimenting
[18:59] <rjharrison_home> BTW is it not possible to get 434.650 /075 on the module?
[18:59] <RocketBoy> does the downlink power keep changing?
[18:59] <rjharrison_home> I'm losing it now
[19:00] <rjharrison_home> alt any one
[19:00] <RocketBoy> 14857
[19:00] <rjharrison_home> anyone got a clean string
[19:00] <rjharrison_home> I'll update the map
[19:01] <edmoore> constant downlink power
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[19:01] <rjharrison_home> chrisfoote the tonna is worth the investment if you are serious about it
[19:01] <edmoore> but it will be spinning around because of completely unstable chute
[19:01] <ShellEvil> rjharrison_home: AIUI EIRP is slighjtly different from ERP - ERP assumes a dipole I think
[19:02] <rjharrison_home> ShellEvil Cool
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[19:02] <rjharrison_home> no clean string then
[19:02] <chrisfoote> rjharrison_home - I'm working up to it ;-)
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[19:06] <edmoore> 12376
[19:06] <edmoore> m
[19:10] <RocketBoy> 52.8609,3.0869
[19:11] <RocketBoy> 10888
[19:12] <RocketBoy> (first time I have seen a 3.xxx lon)
[19:12] <djellison> What lon is Churchill?
[19:13] <djellison> 0.09 - so if we see 3.69 - that's 1% of a circumnavigation ;)
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[19:27] <edmoore> we're beginning to loose signal now
[19:28] <edmoore> about 6.5km
[19:28] <ShellEvil> A sacrifice to Neptune!
[19:29] <ShellEvil> What was the thingy - cc1100 based?
[19:29] <edmoore> cc11111
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[19:30] <edmoore> and venus gps with sarantel ant
[19:31] <edmoore> 255km from launch now
[19:31] <edmoore> a yagi re-point and we've got it again
[19:31] <edmoore> tantalisingly close to holland!
[19:31] <ShellEvil> :)
[19:31] <SpikeUK> Impressive stuff guys!
[19:32] <edmoore> loosing it again
[19:32] <edmoore> it's basically below horizon now
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[19:33] <ShellEvil> Awesome.
[19:33] <edmoore> horizon is 155km away
[19:34] <edmoore> we can still hear it actually now - forgot to turn the pre-amp on!
[19:34] <edmoore> so we're below horizon but still a pretty good signal with pre-amp
[19:34] <ShellEvil> I suppose you've got nice diffraction off the sea
[19:35] <SpikeUK> Tropospheric ducting?
[19:39] <edmoore> ok def lost it now
[19:39] <edmoore> just bought us a few more seconds behind the horizon
[19:39] <edmoore> right, thanks everyone
[19:39] <edmoore> we're going to the pub
[19:39] <edmoore> then catching up on some sleep
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[00:00] --- Sat Aug 22 2009