highaltitude.log.20150209

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[07:38] <SpacenearUS> New position from 03E29AJP-11 after 0318 hours silence - 12http://tracker.habhub.org/#!qm=All&q=E29AJP-11
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[09:10] <Vaizki> what would be a decent price for a used but not abused FT-817ND?
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[09:13] <pc1pcl> I bought one recently but already blocked out the cost from memory.
[09:14] <Vaizki> well I'm looking at one for 350 euros, sound reasonable? :)
[09:14] <fsphil> yes
[09:14] <pc1pcl> A new one is about 600 Eur, e.g. http://www.hamshop.nl/yaesu-ft-817nd.html, so 350 sound like a good price.
[09:15] <fsphil> second hand ones (in good condition) are not much cheaper than a new one atm
[09:15] <fsphil> maybe the prices are becoming more sensible again
[09:15] <SA6BSS> I paind 320Euro for my 817
[09:15] <fsphil> don't expect the internal battery to work
[09:16] <Vaizki> ok.. well I can change the battery to a lipo setup
[09:16] <fsphil> I get about an hour of RX on mine now
[09:17] <daveake> Yeah I'd expect a newish used one to be about £100 less than new
[09:17] <Vaizki> ok sounds good
[09:17] <pc1pcl> Battery is easy to swap, it supports AA cells or their own pack, or you can just feed it from external barrel connector.
[09:18] <Vaizki> my son needs a rig anyway, he's got a ham license but no rig at my place
[09:18] <fsphil> indeed. I carry around a small SLA
[09:18] <fsphil> not very portable :)
[09:18] <Vaizki> I have 7.2Ah 12V SLAs for UPS use
[09:18] <Vaizki> I guess one of those would do :)
[09:18] <daveake> Mine ran out of battery power once, halfway through getting a payload landing position halfway up a mountain
[09:18] <daveake> Good job I had a scanner with me
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[09:20] <fsphil> I still have the FT790 for backup
[09:20] <daveake> those last a lifetime of launches on C cells
[09:20] <fsphil> yea I haven't charged it in a few years
[09:20] <daveake> shame mine died
[09:20] <fsphil> had it on last week, working well
[09:21] <fsphil> has a proper off switch
[09:21] <fsphil> unlike the 817
[09:22] <daveake> I want an 817 with proper batteries, normal charging, and removable front panel
[09:23] <fsphil> it was released in 2001
[09:24] <fsphil> nice to see yaesu keeping things updated
[09:31] <Vaizki> isn't yaesu coming out with some über-rig now
[09:35] <Vaizki> ft-2dr for handheld is new, has aprs modem inside also
[09:40] <Vaizki> 640 usd list price on the ft-2dr
[09:40] <Vaizki> sounds quite reasonable
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[09:44] <edmoore> i have a vx-7r which i quite like
[09:45] <edmoore> wouldn't mind a handheld with a good ssb rx
[09:50] <Vaizki> a friend of mine is getting the FT-991 for home.. I have to go see that bit of kit with my son when he gets it
[09:50] <Vaizki> looks like a pretty sweet tiny thing
[09:51] <Vaizki> sorry not the ft-991
[09:51] <Vaizki> umm now I forgot the model, bleh
[09:51] <Vaizki> or maybe it was 991.. ok I'll shut up now ;)
[09:52] <craag> 991 looks like an ic7000 competitor
[09:52] <craag> quite a bit bigger obv
[09:53] <edmoore> i like my ic-7000
[09:53] <edmoore> not that i've used it much recently
[09:54] <edmoore> yaesu do go in for the late 90's car stereo aesthetic with their hardware and gui don't they
[09:54] <edmoore> http://www.yaesu.com/indexVS.cfm?cmd=DisplayProducts&ProdCatID=102&encProdID=D24F60F33816ED8BE5568D7E2B5E2131&DivisionID=65&isArchived=1
[09:55] <craag> yes - actually looks older than the ic7000 :P
[09:55] <Vaizki> they probably have a demo mode where it really goes to town :)
[09:55] <Vaizki> disco shack
[09:56] <Vaizki> personally I don't really care what equipment looks like as long as the ergonomics are good
[09:58] <craag> yaesu. ergonomics. haha
[09:58] <Vaizki> well I'd need to handle it to see :)
[09:59] <Vaizki> but those things are way out of my price range
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[10:00] <edmoore> a comparison of the performance of a bunch of different polynomials for CRC, as a function of message lengths and other parameters. http://users.ece.cmu.edu/~koopman/roses/dsn04/koopman04_crc_poly_embedded.pdf
[10:01] <amell> anyone else here on plusnet fibre?
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[10:03] <Geoff-G8DHE-Tab> FTTC, yes
[10:03] <amell> hows your upload speed? im getting really low actual upload speed for the bandwidth the FTTC is negotiated at.
[10:04] <Geoff-G8DHE-Tab> Pretty good haven't checked of late.
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[11:20] <Laurenceb> http://img.pr0gramm.com/2015/02/09/6b9bd70e940ddbe4.jpg
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[11:29] <Geoff-G8DHE-M> amell, Just checked 60+ up and 18+ down
[11:35] <Geoff-G8DHE-M> Try reversing them 60+ down and 18+ up! :-)
[11:40] <Vaizki> I need 320M up so I can stream airspy raw to my office ;)
[11:41] <Geoff-G8DHE-M> Try bonding a few together or go for FTTP
[11:51] <Vaizki> I have fiber to my garage, actually 6 of them
[11:51] <Vaizki> but the service providers don't offer anything better than 100/10 to it
[11:52] <Vaizki> sure I could go to a "business internet" provider, have them lease the fiber "black" and run 1G/1G on it but that would cost a cool 2k/month or so
[11:53] <Vaizki> doable, I admit
[11:54] LunarWork (~kevin@pc32-338.physik.uni-osnabrueck.de) joined #highaltitude.
[11:54] <LunarWork> hello
[11:56] <Vaizki> hello osnabrück
[11:56] <Vaizki> I have been to osnabrück only once and that was to go to a dentist :)
[11:58] <LunarWork> :) hope it was not a bad experience?
[12:00] <Vaizki> well not too great, had a filling come loose on the drive from rostock to le mans and had to stop for some emergency dentist work
[12:00] <LunarWork> :( oh
[12:01] <Vaizki> was not feeling like driving after the operation either so checked into a cheap hotel don't even remember the name
[12:01] <Vaizki> but anyway, maybe I should revisit ;)
[12:01] <LunarWork> yea :)
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[12:42] <Laurenceb> anyone here any good with bash?
[12:43] <Vaizki> try me
[12:43] <Laurenceb> so i have a long file name with spaces
[12:43] <Laurenceb> i want to get the first 4 characters of the file name
[12:43] <Laurenceb> so
[12:44] <Laurenceb> fddfas dasd/sadas/dasd/sdADQW/DSDAS/abcd_SADASD.FOO
[12:44] <Laurenceb> i want the abcd
[12:45] <Vaizki> well if $f = "fddfas dasd/sadas/dasd/sdADQW/DSDAS/abcd_SADASD.FOO", then basename($f) == "abcd_SADASD.FOO"
[12:45] <Vaizki> that's your first step
[12:45] <Laurenceb> hmm
[12:45] <Laurenceb> its breaking for some reason
[12:46] <Laurenceb> i need to find a way to debug it
[12:46] <Vaizki> then you can just pipe to 'cut'
[12:46] <Laurenceb> the problem is this function is buried in some really complex thousands of line stuff
[12:46] <Laurenceb> i dont want to break anything
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[12:46] <Vaizki> or hmm actually ${f:0:4} works as a substring in bash I think
[12:47] <Vaizki> http://wiki.bash-hackers.org/syntax/pe
[12:48] <Vaizki> good magic in that link
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[12:49] <Laurenceb> yeah thats there already
[12:49] <Laurenceb> something seriously weird is going on
[12:49] <Laurenceb> i have a $1 variable appearing seemingly from nowhere
[12:50] <Laurenceb> function Process_All_In_Path {
[12:50] <Laurenceb> #First we loop through all
[12:50] <Laurenceb> for f in "$files_path"/$1 ; do
[12:50] <Laurenceb> i call this using Process_All_In_Path *[vV]*[aA]*
[12:51] <Laurenceb> but $1 is plot_hv.tex
[12:51] <pc1pcl> do you already echo debug info to a /tmp/file? e.g. echo "working on $f" >> /tmp/debug.txt etc. on strategic placed?
[12:51] <Laurenceb> which appears nowhere in my code
[12:51] <Laurenceb> no ill add some of that
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[12:52] <Laurenceb> yeah $1 is set to plot_hv.tex
[12:52] <Laurenceb> thats a file in another folder somewhere... its part of the project but has notrhing to do with this code
[12:52] <Vaizki> *[vV]*[aA]* is not a regexp and not a glob
[12:52] <pc1pcl> so the the * might match more than you bargained for.
[12:53] <Laurenceb> oh
[12:53] <Laurenceb> i see whats happening
[12:53] <Laurenceb> so how can i pass the glob as a string and expand it later?
[12:54] <Vaizki> quote it?
[12:54] <pc1pcl> quote it?
[12:54] <Vaizki> echo
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[12:54] <pc1pcl> or escapes at the right points, might work.
[12:54] <Laurenceb> it wasnt expanded
[12:55] <Vaizki> what I would do is 'for' through the whole directory and then use a regexp match at the start of the for loop to check the filename and 'continue' if it's not the right one
[12:55] <Vaizki> not a fan of glob matching
[12:56] <Laurenceb> but i still need to tell the function what it has to search for
[12:56] <pc1pcl> with this kind of thing also scary if there's spaces in the filenames..
[12:56] <Laurenceb> the function is designed to find certain files
[12:56] <Vaizki> globs have historical baggage
[12:56] <Laurenceb> it connects to a windows file server
[12:56] <pc1pcl> for all in $(find .....) ?
[12:56] <Laurenceb> so lots of spaces
[12:57] <Vaizki> from a balloon? :)
[12:57] <Laurenceb> no this is work stuff :P
[12:57] <Vaizki> yea just yanking yer chain
[12:57] <Vaizki> my invoice will be forthcoming to your company
[12:57] <Laurenceb> heh
[12:57] <Laurenceb> nobody here could even turn on a computer so...
[13:06] <SpacenearUS> New vehicle on the map: 03PROJECT2 - 12http://tracker.habhub.org/#!qm=All&q=PROJECT2
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[13:06] <_Paradigm> Hi DutchMillbt!
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[13:08] <tweetBot1> @thecraag: HAB LoRa Gateway added to the 434 MHz Antenna at the WebSDR. With PPS NTP for errr.. good packet timestamping? #ukhas http://t.co/ik3cpnWgd6
[13:09] <DutchMillbt> Hi _Paradigm
[13:09] <Vaizki> no sign of tha playload?
[13:09] <_Paradigm_> Nope no phone rang just yet
[13:10] <_Paradigm_> (Switched to mobile)
[13:11] <DutchMillbt> What was the content of the payload?
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[13:12] <_ParadigmMobile> Wifi is screwing me over lol
[13:13] <DutchMillbt> take 2 Hi _ParadigmMobile what was the content of te payload?
[13:14] <Laurenceb> found the problem
[13:14] <Laurenceb> my variables are expanded before being passed
[13:14] <Laurenceb> but i have no clue how to fix it :-(
[13:14] <_ParadigmMobile> DutchMillbt: keychain cam and canon powershot
[13:14] <_ParadigmMobile> DutchMillbt: cheap powershot though :)
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[13:17] <DutchMillbt> Aha let's hope someone will find the payload and send it back
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[13:33] <Ian_> If you quote them ? You are aware of the difference between single and double quotes of course?
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[13:38] <meelis> hello world
[13:38] <meelis> could i ask a few questions about the habhub user interface?
[13:39] <lz1dev> go ahead
[13:48] <Laurenceb> hmf
[13:48] Action: Laurenceb is utterly stuck
[13:50] <Laurenceb> http://pastie.org/9923853
[13:50] <Laurenceb> can anyone help me out with this?
[13:50] <Laurenceb> line 53... I might be doing something wrong?
[13:51] <Laurenceb> line19 is a local path
[13:51] <Laurenceb> i dont understand why
[13:51] <lz1dev> it's hard to debug matching patterns
[13:51] <Laurenceb> yup :-/
[13:51] <lz1dev> without having a bunch of example strings
[13:52] <Laurenceb> yeah but im not sure that that is the problem?
[13:52] <Laurenceb> it seems to be related to now im passing the arguments
[13:52] <lz1dev> well how can anyone help then?
[13:52] <Laurenceb> heh
[13:52] <Laurenceb> hmm maybe i should give up lol
[13:52] <Laurenceb> rewrite it in c
[13:52] <lz1dev> go for assembler :D
[13:53] <Laurenceb> raw machine code would be easier and faster than this
[13:53] <lz1dev> does this generate one huge tex file?
[13:53] <Laurenceb> yes
[13:54] <lz1dev> that sed pipe tho
[13:54] <Laurenceb> ~10k pages
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[14:00] <Vaizki> for f in "$files_path"/$1
[14:00] <Vaizki> why not: for f in "${files_path}/$1"
[14:00] <lz1dev> he is not very good with bash :)
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[14:01] <Vaizki> and also line 57, Process_All_In_Path '*[vV]{?,??}[cC]*'
[14:01] <Vaizki> is that a valid glob?
[14:02] <Vaizki> or line 53 for that matter
[14:02] <Vaizki> I suck at globs
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[14:03] <SpeedEvil> http://www.aliexpress.com/store/product/2015-New-large-size-Hello-Kitty-Cat-foil-balloons-cartoon-birthday-decoration-wedding-party-inflatable-air/638778_32265475049.html
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[14:03] <lz1dev> {?,??} will duplicate all paths
[14:04] <lz1dev> that match
[14:05] <lz1dev> $ ls [SS]{?,??}*
[14:05] <lz1dev> SOWHAT SOWHAT
[14:05] <lz1dev> you probably don't want that
[14:07] BrainDamage (~BrainDama@gateway/tor-sasl/braindamage) got netsplit.
[14:11] <pc1pcl> what is the actual format of these special names of files you want to process?
[14:12] <lz1dev> so that pattern, with extglob enable, should be *[vV]@(?|??)[cC]*
[14:12] <lz1dev> without any quotes
[14:16] <lz1dev> oh its actually passed to function, then it's fine
[14:16] <lz1dev> Laurenceb: are you reading this?
[14:17] <Laurenceb> ok thanks
[14:17] <Laurenceb> ive made some progress now
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[14:17] <Laurenceb> by simplifying the arguments passed to the function
[14:17] <lz1dev> your pattern is still dodgy tho
[14:18] BrainDamage (~BrainDama@gateway/tor-sasl/braindamage) got lost in the net-split.
[14:18] <Laurenceb> ok
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[14:19] <Laurenceb> only one issue left
[14:19] <Laurenceb> cp "$f"Processed/*_crt.eps "Graphics_HV/""$name""/pte.eps"
[14:20] <Laurenceb> this fails if * matches something with whitespace
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[14:20] <pc1pcl> or more than one file, I suppose.
[14:20] <lz1dev> ofc
[14:20] <pc1pcl> more quotes might help, or assigning to variable first and then cp $SRC $DST
[14:20] <lz1dev> no quotes
[14:20] <lz1dev> :D
[14:21] <Laurenceb> hmm
[14:21] <meelis> a question, then, is how the habhub radio location works in practice and why isn't the same system used for modern aircraft`
[14:21] <Laurenceb> it needs quotes as $f has spaces
[14:21] <pc1pcl> but * might also match spaces
[14:22] <Laurenceb> yeah which is what i want
[14:22] <pc1pcl> so you'd need more quotes around the whole thing
[14:22] <pc1pcl> which then gets unreadably and probably a mess of escapes to make the correct right quote match the right left quote...
[14:22] <lz1dev> meelis: aircraft usually carry ADS-B transponders, which are big, heavy, and expensive
[14:23] Action: Laurenceb is confused
[14:23] <Laurenceb> cp "$f"Processed/*_crt.eps "Graphics_HV/""$name""/pte.eps" <- what changes do i make?
[14:25] <lz1dev> does that match a single file
[14:25] <lz1dev> or many files?
[14:25] <Laurenceb> a single
[14:25] <lz1dev> i assume single
[14:25] <pc1pcl> cp "${f}Processed/*_crt.eps" "GraphicsHV/$name/pte.eps" if matches 1 file.
[14:25] <lz1dev> if you surround globs with quotes
[14:25] <lz1dev> they dont get expanded
[14:26] <Laurenceb> yeah
[14:26] <Laurenceb> that fails
[14:26] <fsphil> meelis: http://www.flightradar24.com/ is pretty close
[14:27] <meelis> fsphil, flightradar doesnt track over oceans... :(
[14:28] <lz1dev> Laurenceb: just make a variable first a="$f"Processed/*_crt.eps, then cp "$a" ...
[14:28] <fsphil> for the most part neither does habhub
[14:28] <pc1pcl> hmm, then cp "${f}Processed/"*"_crt.eps" "GraphicsHV/$name/pte.eps"
[14:28] <fsphil> the exception being some recent flights that used HF radio
[14:28] <fsphil> habitat*
[14:28] <lz1dev> pc1pcl: the * can expand to something with whitspace
[14:28] <lz1dev> so you end up with cp asdasdasdsad asd zxczxczxc
[14:29] <lz1dev> where "asdasdasdsad asd" is the file name
[14:29] <Laurenceb> ok trying it
[14:29] <pc1pcl> well, I tried this:
[14:29] <fsphil> commercial aircraft do have HF radio but I don't know if they transmit their position over it
[14:29] <meelis> it would be great to hear more about those HF projects...
[14:29] <pc1pcl> luteijn@samsung-pc:~$ diff aap.orig Shell\ 460\ Solvent.pdf
[14:30] <pc1pcl> after doing: luteijn@samsung-pc:~$ cp "Shell"*"orig" aap.orig
[14:30] <fsphil> meelis: those flights where done by http://picospace.net/
[14:31] <pc1pcl> so there it did work out. but usually if I have to process files with space in the names, I just avoid shell scripts and use perl
[14:31] <lz1dev> not sure thats better tho :>
[14:32] <pc1pcl> fsphil: commercial planes probably only broadcast position over HF when doing a mayday call ;)
[14:33] <pc1pcl> lz1dev: for this kind of file management scripts I guess perl is fine, or at least for me works out better than messing around in sh to get the quoting, escaping etc. just right..
[14:34] <lz1dev> im sure there is a better cleaner way to do in bash
[14:35] <lz1dev> i wouldn't want to come back to something like that in a year and pull my hair for hours
[14:36] <Laurenceb> lz1dev: ok so it doesnt work
[14:36] <Laurenceb> as a isnt expanded
[14:37] <lz1dev> you've done it worng then :)
[14:37] <lz1dev> paste the line
[14:37] <Laurenceb> a="$f"Processed/*_crt_shape.eps
[14:37] <Laurenceb> cp "$a" "Graphics_HV/""$name""/psh.eps"
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[14:39] <lz1dev> looks write
[14:39] <lz1dev> jesus, i mean right
[14:40] <Laurenceb> /V25C/Processed/*_crt.eps: No such file or directory
[14:40] <lz1dev> yep
[14:40] <lz1dev> no such file
[14:40] <pc1pcl> luteijn@samsung-pc:~$ a=Shel*
[14:40] <pc1pcl> luteijn@samsung-pc:~$ echo $a
[14:40] <pc1pcl> Shell 460 Solvent.pdf Shell 460 Solvent.pdf_orig Shell 460 Solvent.ps
[14:40] <pc1pcl> luteijn@samsung-pc:~$ echo "$a"
[14:41] <pc1pcl> Shel*
[14:42] <pc1pcl> what does removing the quotes around $a after cp do?
[14:44] <lz1dev> or right
[14:44] <lz1dev> it gets expanded later
[14:44] <lz1dev> erm...
[14:45] <pc1pcl> other option that might work is to use a for loop?
[14:45] <Laurenceb> i was trying to use eval
[14:45] <Laurenceb> but failing
[14:45] <pc1pcl> luteijn@samsung-pc:~$ for all in $a
[14:45] <pc1pcl> > do
[14:45] <pc1pcl> > echo $all
[14:45] <pc1pcl> > done
[14:45] <pc1pcl> Shell 460 Solvent.pdf
[14:45] <pc1pcl> Shell 460 Solvent.pdf_orig
[14:45] <pc1pcl> Shell 460 Solvent.ps
[14:45] <lz1dev> Laurenceb: no wait, just do a=("$f"Processed/*_crt_shape.eps)
[14:45] <lz1dev> that should expand the glob and assign the result to a
[14:46] <Laurenceb> aha
[14:46] <Laurenceb> that worked, finally
[14:46] <Laurenceb> thanks :D
[14:47] <pc1pcl> will only get you the first match I think, but I guess in this case that might be a good thing.
[14:47] <lz1dev> Laurenceb: you want to test if the file exist
[14:47] <lz1dev> before doing anything
[14:47] <Laurenceb> yeah
[14:48] <Laurenceb> also another problem ive just spotted, the names arent consistent..
[14:48] <Laurenceb> stupid medical data
[14:48] <lz1dev> shocking
[14:48] <Laurenceb> i need to do some sort of substring search and extract
[14:50] <pc1pcl> probably can use grep or cut or even sed for that.
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[15:43] <SpeedEvil> https://www.kickstarter.com/projects/654955049/tesla-coils-for-north-korea
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[16:00] <meelis> hey!
[16:01] <meelis> i wonder if i could use 434 MHz radio equipment to track my balloon on its course over Atlantic ocean?
[16:01] <meelis> didn't quite get that
[16:01] <pc1pcl> yes and no.
[16:02] <meelis> meaning?
[16:02] <pc1pcl> probably not 'live' as the range wouldn't be long enough for anybody to hear the transmissions when balloon is out over the ocean
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[16:03] <meelis> what do mean by "non-live" then?
[16:04] <pc1pcl> you could buffer your position and then rebroadcast later on:
[16:05] <pc1pcl> "I'm at X,Y,Z; I was at U,V,W one hour ago, at R,S,T two hours ago, ..."
[16:06] <pc1pcl> then once it is in range again of a receiver, you can reconstruct the course it took.
[16:08] <meelis> oh, thanks!
[16:08] <pc1pcl> but that would be an advanced project..
[16:08] <meelis> what would the approximate range of 434 MHz radio location be?
[16:08] <pc1pcl> Basically line of sight.
[16:09] <meelis> how many km is that?
[16:09] <pc1pcl> so on the ground, not very far, as houses get in the way, or the ground itself (curvature of the earth)
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[16:10] <meelis> not much? but how is it then possible to maintain habhub?
[16:10] <pc1pcl> if you go up in a balloon, there's no more houses, and also you don't hit the ground itself so early.
[16:10] <meelis> i c
[16:10] <pc1pcl> so then there is hundreds of km's of range.
[16:11] <pc1pcl> if you look at the tracker website, the circles give an indication of the line of sight range for the altitude the balloon is at.
[16:13] <pc1pcl> (observer/receiver at the blue circle would just see the balloon on the horizon, on the green circle it would be 5 (I think) degrees above the horizon)
[16:13] <meelis> thanks. i was wondering what those are...
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[16:13] <meelis> btw there dont seem to be any masts in USA... do you know why is that?
[16:14] <pc1pcl> the masts are only plotted when the listener is (c.q. was recently) active, and they usually are only active when there's something to listen to
[16:14] <meelis> I am planning to construct a Raspberry Pi ADS-B receiver based on DVB-T dongle and launch it on a HAB... would that kind of project seem to make sense?
[16:15] <pc1pcl> and also probably less need for US people to listen on 434 as easier to use amateur radio and APRS network there.
[16:21] <Vaizki> meelis, no it doesn't make a lot of sense to me
[16:22] <craag> I don't see anything wrong with it.
[16:23] <Vaizki> me neither, just dont see much benefit either?
[16:23] <craag> For an hour or so you'd have the best ADS-B coverage, in the world!
[16:23] <Vaizki> hehe
[16:23] <craag> But of course you'd have to wait til landing for the data
[16:24] <craag> Would be kinda cool to see the extreme range you get. Go for it :)
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[16:25] <meelis> i was thinking to take part in www.balloonchallenge.org and looking for a science experiment. i was surprised to find out that ADS-B is basically DVB-T, so i thought to try that out.
[16:26] <craag> Well you can certainly receive it with the rtl-sdr dongles and a Pi.
[16:26] <craag> So yeah - dump the packets you receive to a file - and make lots of pretty graphs after!
[16:28] <meelis> thanks
[16:29] <pc1pcl> dump1090 works on a Pi I think.
[16:29] <Vaizki> yes and its very good
[16:30] <pc1pcl> you could probably even relay some of the key info decoded over rtty for a live view.
[16:31] <Vaizki> with 800km coverage, it will flood data
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[16:33] <craag> well just packets received in the last second maybe :)
[16:33] <craag> *number of
[16:34] <craag> Then you know if it's working or not
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[16:39] <fsphil> that would be a fun project
[16:40] <fsphil> how large is a typical adc-b packet?
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[16:48] <Maxell> fsphil: I think the raw mode of dump1090 spits out something like *8D451E8B99019699C00B0A81F36E;
[16:49] <Maxell> And newlines after such packet
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[16:59] <fsphil> not much data. some of them could be transmitted over rtty
[17:00] <Vaizki> well one packet only carries 7bytes of payload like position etc
[17:00] <Vaizki> so they send packets at 1Hz, interleaving data
[17:00] <pc1pcl> but (esp at height) many packets to handle
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[17:27] <Maxell> I would say try something like that w/ wifi downlink on a quadcopter :)
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[17:42] <Geoff-G8DHE> Dd I read that right above ADS-B is based on DVB-T ? Surely not ? http://www.etsi.org/deliver/etsi_en/301800_301899/30184101/01.03.01_40/en_30184101v010301o.pdf
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[18:38] <Vaizki> Geoff-G8DHE: no it's not even based on any of the same modulations etc... I don' t think there's anything in common.
[18:39] <Vaizki> except both can be received with RTL tuner chips..
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[18:44] <Lunar_Lander> evening
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[20:03] <Geoff-G8DHE> Vaizki, Yes I think meelisi had the wrong end of the stick, assuming that an DVB-T dongle was used for its DVB-T capabilities rather than its SDR capabilities!
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[20:04] <Vaizki> of course it would be great to get a 11Mbps QAM64 stream from approaching planes, all the telemetry and 12 channels of inflight entertainment!
[20:06] <Vaizki> the Airspy that I use has 10Mhz of bandwidth so for example in SDR# I can see a whole DVB-T bundle at once sticking out of the noise floor
[20:06] <Vaizki> it's like table mountain or ayers rock, frigging HUGE
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[20:13] <mbales> quick question about selling an APRS tracker or similar
[20:14] <mbales> Anyone know what hoops if any are required by the FCC for selling an amateur radio device?
[20:14] <Vaizki> http://i.imgur.com/hKz3jPz.png
[20:14] <Vaizki> that's a DVB-T bundle
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[21:03] <bertrik> was yesterdays' LUTEIJN recovered?
[21:04] <SA6BSS> nop, came down in an urban area,
[21:04] <SA6BSS> with some speed, so the radio probably went dead
[21:05] <bertrik> oh, pity
[21:05] <Vaizki> yea it was like 12m/s on descent
[21:06] <Vaizki> they spent 3 hours looking for it, including talking themselves into the 7th story apartment of an elderly couple to try and catch the signal from high up
[21:06] <Vaizki> never heard a peep
[21:06] <Geoff-G8DHE> it was down to -5.6m/s at 1Km
[21:06] <Vaizki> oh ok, I saw 12 mentioned somewhere. well that's not bad at 5.6?
[21:07] <Geoff-G8DHE> not really
[21:08] <craag> ~5 is what we try to aim for
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[21:27] Nick change: day- -> day
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[21:28] <jededu> New EDUPIC boards arrived from hackvana today http://imgur.com/slfW4vD
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[21:34] <Lunar_Lander> jededu, nice!
[21:34] <jededu> Thx
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[21:49] <Vaizki> noob question, why is the ground plane riddled with small holes?
[21:52] <Vaizki> is there another ground plane underneath and those holes are vias connecting the planes?
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[21:53] <jededu> Yes the vias connect the groundplanes
[21:55] <jededu> And helps with sheilding
[21:55] <Vaizki> ok so it's mostly to protect rf by grounding return currents as soon as possible?
[21:56] <Vaizki> (I'm very new to this :)
[21:58] <Vaizki> ha, found a useful article on maxim's site
[21:58] <Vaizki> http://www.maximintegrated.com/en/app-notes/index.mvp/id/5100
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[22:05] <jededu> This is the back http://imgur.com/nCXY7qC
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[22:07] <Vaizki> right.. is that a 3-layer board? :O
[22:07] <Vaizki> no sorry it's 2 layer after all.. just most of the pads of the ublox are not connected
[22:07] <Vaizki> that threw me off
[22:10] <Vaizki> btw, the break-away 5-pin "sideboard" where the middle pin is GND.. it connects to a ground plane which is isolated from the main PCB ground plane
[22:11] <Geoff-G8DHE> check the via out to the other side
[22:12] <Vaizki> ah ok true..
[22:13] <Vaizki> this is how I learn, by critiqueing other and having myself corrected :)
[22:13] <Geoff-G8DHE> wait till you come to your first 4/6 layer board with blind via's!
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[22:13] <Vaizki> no I won't
[22:13] <Vaizki> because it won't work and I will have no way to fix it
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[22:23] <Vaizki> ok so mtx2 goes on the back
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[22:24] <Vaizki> thanks for sharing high res pics, I learned a couple of new things again
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[22:39] <Vaizki> oho oho interfax sentään tehnyt oikaisun ja pyytänyt anteeksi virhettään niinistön lausunnossa
[22:39] <Vaizki> ack!
[22:40] <Vaizki> wrong window, sorry
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[23:17] <Lunar_Lander> good night!
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[23:18] <Vaizki> indeed, sleepy time&
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[23:39] <SpacenearUS> New vehicle on the map: 03CALLSIGN123_chase - 12http://tracker.habhub.org/#!qm=All&q=CALLSIGN123_chase
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[23:40] <jiffe> what solar panels were used on the B* balloons?
[23:42] <qyx_> ebay type
[23:42] <qyx_> 19x79mm cells or similar
[23:42] <lz1dev> hitech
[23:42] <lz1dev> ebay panels
[23:43] <qyx_> http://www.ebay.com/itm/321027694246
[23:43] <qyx_> like those
[23:44] <jiffe> ah cool
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[00:00] --- Tue Feb 10 2015