highaltitude.log.20150409

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[00:25] <Guest49248> Helloo
[00:25] <Guest49248> Am I allowed to ask for buying advice here? :)
[00:26] <lz1dev> sure, just ask away, and if anyone is awake you might get some advice
[00:26] <Guest49248> Allrighty so
[00:28] <Guest49248> For the PITS
[00:28] <Guest49248> I have a FunCube dongle
[00:28] <Guest49248> And just curious
[00:29] <Guest49248> As to what type of antenna I should use
[00:29] <Guest49248> For the ground station
[00:29] <Guest49248> And by ground station I mean car :P
[00:31] <lz1dev> whats the mode and frequency you going to use?
[00:33] <Guest49248> It uses 434 MHz I think
[00:34] <lz1dev> how powerful is tx on payload?
[00:36] <Guest49248> Not too much. Just the default PITS stuff.... Interval SSDV
[00:45] <lz1dev> for chase car, i imagine just a whipe of the correct length would be sufficent
[00:46] <lz1dev> whipe=whip :)
[00:49] <Ian_> Quarter wave magmount for Amateur Radio 70cm band
[00:50] <Ian_> For the final mile, you might consider a yagi of around 6 elements. Directional so that you can find your package in a field of oilseed rape or a forrest of trees.
[00:51] <lz1dev> a forrest of trees
[00:51] <Guest49248> Okay, thanks!
[00:51] <lz1dev> :D
[00:51] <lz1dev> yes, consider brining a very long pole
[00:52] <lz1dev> incase the trees catch it
[00:52] <Ian_> And a chain saw . . .
[00:52] <lz1dev> :D
[00:52] <Ian_> Flack jacket (anti farmer)
[00:52] <Ian_> In a few weeks, a Yellow parachute will not be a good idea perhaps.
[00:53] <lz1dev> you mean green?
[00:53] <Ian_> Well, that too. I'm not thinking very fast am I?
[00:54] <lz1dev> so camoflauge chutes are no go?
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[01:00] <Ian_> nice and bright is the order of the day, flourescent pink/red
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[05:07] <Roofus> Hi!
[05:08] <Roofus> I'll be quick -- http://www.amazon.com/Tram-1185-Amateur-Dual-Band-Antenna/dp/B0045EQUBK/ref=sr_1_1?ie=UTF8&qid=1428555696&sr=8-1&keywords=Mag+mount+antenna
[05:08] <Roofus> Is this a good antenna to use to chase after PITS balloons?
[05:09] <Roofus> I have a funcube dongle, if that matters :P
[05:09] <adamgreig> yea looks reasonable enough. it's a PL-259 connector which probably won't go into your funcube directly so you'll need an adapter of some kind.
[05:10] <Roofus> Oh shoot
[05:10] <Roofus> Is funcube SMA?
[05:11] <adamgreig> I believe so
[05:11] <adamgreig> the original was :P
[05:12] <Roofus> Gotcha
[05:12] <Roofus> http://www.amazon.com/Original-Antenna-UT-108UV-SMA-Female-wholesaler/dp/B00DTQ4A6M/ref=sr_1_2?ie=UTF8&qid=1428555696&sr=8-2&keywords=Mag+mount+antenna So perhaps.. this is a better choice? :P
[05:13] <adamgreig> meh
[05:13] <adamgreig> that looks like a worse (less sturdy) antenna
[05:13] <adamgreig> and I think that's actually the wrong gender SMA
[05:13] <adamgreig> (it's designed to plug directly into some handheld radios)
[05:15] <adamgreig> http://www.amazon.com/Handheld-Antenna-SO-239-Female-Connectors/dp/B00COW5E3A
[05:15] <adamgreig> you want SMA male on your cable (your funcube is SMA female)
[05:15] <adamgreig> (also avoid RP-SMA)
[05:15] <adamgreig> so you could get an antenna with SMA female on it probably
[05:15] <adamgreig> or just get the PL-259 antenna and a cable like ^ to convert it
[05:15] <adamgreig> http://www.amazon.com/M-24SJ-MagMount-446MHz-SMA-Female-Jack/dp/B00FYUHQLC
[05:16] <adamgreig> that^'s the only sma female antenna I could spot on amazon.com and it's actually the exact same antenna I have (and is pretty good!) but $50...
[05:16] <adamgreig> hold that thought, the photo shows SMA male but description says female, lol
[05:19] <Roofus> Ahhh
[05:19] <Roofus> Thank you so much <3
[05:20] <adamgreig> so I would go with your original choice of antenna and that SO-239 to SMA-male adapter cable
[05:20] <Roofus> I will :)
[05:20] <adamgreig> (in case you hadn't realised, the male plug is PL-259 on that antenna, and the female socket for it is SO-239 on the adapter cable, going to male SMA (which has a pin in the middle but an interior screw thread) which connects to female SMA on your funcube (socket in the middle, but external screw thread)
[05:22] <Roofus> Yup, saw
[05:22] <Roofus> Thank you so much again
[05:22] <adamgreig> np, good luck!
[05:28] <Roofus> Do any of you guys use PITS?
[05:29] <adamgreig> I don't personally but if you come on here in UK working hours (so about two or three hours from now) a lot of people do (including daveake / UpuWork who make it)
[05:29] <adamgreig> I imagine plenty of US people use it too but they're less represented here right now :P
[05:31] <Roofus> Ahh gotcha :P
[05:34] Nick change: fl_0|afk -> fl_0
[05:38] <Upu-> morning
[05:38] <Upu-> hi Roofus
[05:38] Nick change: Upu- -> Upu
[05:40] <Roofus> 'ello
[05:41] <Roofus> So a Bad Checksum error means the GPS is goofing somewhere, right?
[05:42] <Upu> no means the transmission hasn't been recieved correctly
[05:42] <Upu> where are you seeing that ?
[05:42] <Upu> in dl-fldigi ?
[05:44] <Roofus> No, on the Pi
[05:44] <Upu> log files ?
[05:45] <Roofus> 'tis on the SSH window
[05:45] <Maxell> Bad Checksum after you type in what command?
[05:46] <Roofus> http://pastebin.com/eQjiDRn4
[06:06] <Roofus> So uhm.. is that normal?
[06:07] <Roofus> The checksum is after I start the /pits/tracker script
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[06:19] <daveake> Don't worry about it
[06:20] <daveake> actually
[06:21] <daveake> take that back .. never seen that before
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[06:22] <daveake> New or old PITS? Latest software?
[06:25] <Roofus> New PITS. I installed it today so....
[06:25] <Roofus> Updating the firmware now nonetheless
[06:26] <daveake> Which model Pi ?
[06:27] <Roofus> A+
[06:27] <daveake> And when you run the tracker program, which Pi does it say you have ?
[06:27] <Roofus> "A+ or B+"
[06:28] <daveake> ok good
[06:33] <Roofus> Yup :D
[06:33] <daveake> See PM
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[06:50] <gonzo_> I'm seeing some fhss sig on 434meg, looks to be fsk about 8khz shift, jumping over the whole lpd allocation
[06:50] <gonzo_> anyone seen anything similar? know the device?
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[07:46] <Vaizki> gonzo_, has it been active for a long time?
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[07:58] <marcis_> hello!
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[07:59] <Maxell> Hi
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[08:00] <marcis_> What are the next steps after creating flight document?
[08:01] <marcis_> Which person should be noiced?
[08:01] <daveake> /join #habhub and quote the ID
[08:02] <Vaizki> did you test the payload without a flight doc?
[08:02] <Geoff-G8DHE-Lap> Once you have the payload doc tested and working then create the Flight document and post the ID number in #habhub the Admins will check its been tested and authorise.
[08:02] <marcis_> thanks! Yes, I tested it several times
[08:04] <marcis_> If I already made flight document, where I can see the ID?
[08:06] <Geoff-G8DHE-Lap> Go to the generate page find it and on the righthand side is the long D number
[08:06] <Geoff-G8DHE-Lap> above the date
[08:06] <marcis_> Thanks! found it!
[08:06] <craag> marcis_: What name did you give it?
[08:06] <craag> :0
[08:06] <craag> *:)
[08:07] <marcis_> flight name: IRBE-1 launch
[08:08] <craag> Ok, so paste the long string with numbers and letters into #habhub
[08:08] <craag> And ask the admins if they wouldn't mind approving it for you :)
[08:09] <craag> Wrong one
[08:09] <craag> That's the payload doc
[08:09] <craag> You need the ID of the flight doc
[08:09] <marcis_> oh okay
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[08:14] <x-f> hi, marcis_, all set for tomorrow?
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[08:16] <marcis_> Hi, almoast done! GPS and com part is ready, sensors still need some work
[08:18] <x-f> heh, that's pretty common for first launches :)
[08:18] <marcis_> we also got GSM module on board just in case
[08:18] <x-f> don't forget to charge all batteries in the payload and on the ground
[08:18] <edmoore> what sensors are you flying?
[08:19] <edmoore> ha that's good advice
[08:19] <marcis_> it is not tested yet together with 70cm tx though. Hope there will not be any interference problems
[08:19] <marcis_> Temp, of course, pressure, magnetometer, acelerometer
[08:20] <edmoore> excellent
[08:21] <edmoore> what are you hoping to get from the accelerometer?
[08:23] <marcis_> well, its on magnetometer chip, so well log it anyway, just because we can. Maybe to see how value changes when it is rising and falling...
[08:24] <Geoff-G8DHE-Lap> Could be interesting to see what G forces happen at burst!
[08:24] <mfa298> marcis_: when are you flying this ?
[08:24] <marcis_> main experiment is modified camera to get IR pictures
[08:24] <marcis_> Tomorrow, we hope ;)
[08:25] <Geoff-G8DHE-Lap> Your planning more than one flight ?
[08:25] <mfa298> and you're still building it, that's going to be interesting.
[08:26] <Vaizki> I am constantly amazed how people plan a flight for a payload that doesn't work yet :)
[08:26] <marcis_> Just one, but we hope that weather will be ok. It looks like it today
[08:26] <edmoore> Geoff-G8DHE-Lap, yes that's an interesting thing to do
[08:26] <edmoore> we used a 3-axis one for burst detection on badger1
[08:26] <mfa298> remember once the flight doc is approved it locks in the payload doc,so if anything changes in the sentece you send it'll stop working
[08:27] <edmoore> when the magnitude dropped beneath about 0.2G (i.e. roughly freefall) we took that as burst
[08:27] <x-f> Vaizki, http://www.goodreads.com/quotes/1398-i-love-deadlines-i-love-the-whooshing-noise-they-make :)
[08:27] <edmoore> the idea being that you could then fire a pyro to instantly cut away the balloon remains
[08:27] <edmoore> and avoid tangling
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[08:28] <Geoff-G8DHE-Lap> edmoore, makes a lot of sense, sort of thing you might test well before the flight and many times as well.
[08:28] <edmoore> it was soft-armed to only take notice above 25km
[08:29] <edmoore> so as to not randomly go during turbulance in the jet stream
[08:29] <marcis_> Well You all all correct about fully untested payload. But in tracking domain nothing will change of course, because it is ready ;)
[08:30] <Geoff-G8DHE-Lap> Ah your storing the data then not sending it back on telemetry ?
[08:30] <marcis_> We are sending just temp and bat voltage....
[08:31] <marcis_> Would you like to ssee for example accelerometer reading?
[08:31] <edmoore> sure
[08:31] <edmoore> it might show interesting things
[08:31] <Geoff-G8DHE-Lap> the accelermmeter readings will probably change to rapidly for telelmetry
[08:32] <marcis_> Well today is a long day, we have time to add it. But cant promise
[08:33] <edmoore> found that too - never did this but thought about sending mean and variance of the last 10 secs
[08:33] <edmoore> also back in the day we logged everything to sd card
[08:33] <x-f> marcis_, what mfa298 was saying is - don't change the telemetry sentence, after the flight doc has been approved, it won't appear on the map anymore
[08:33] <edmoore> so that could be at a much higher rate
[08:33] <marcis_> yes, that I understand. We still need payload doc tested
[08:34] Action: x-f coughs politely.
[08:34] <x-f> marcis_, will anybody of your team join this chatroom tomorrow so we know what's happening there?
[08:35] <x-f> if my PC will respond to the Wake-on-LAN packet, i hope to help with the tracking
[08:35] <marcis_> no problem! We will use habhub tracker anyway
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[08:36] <x-f> Reb-SM0ULC, you should be able to hear IRBE-1 tomorrow if you're free, launch site is close to the sea
[08:36] <x-f> es5nhc, you too ^^
[08:37] <marcis_> that would be nice! Thanks
[08:37] <gonzo_> that fhss stuff on 434mhz seems to have faded out. I did start wondering if it was soem drone/quadcopter telem, as someone mentioned something about them day
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[08:39] <Vaizki> gonzo_, that would have been my guess as well...
[08:39] <gonzo_> the other day
[08:39] <gonzo_> as long as it's shoprt duration. As that would kill all hab telem (without fec)
[08:41] <gonzo_> just for the record, in case anyone else sees similar... it looked rough;y 25khz channeling, 10-12khz wide.
[08:44] <mfa298> marcis_: If you've got the tracking payload ready and it's working I'd personally not go making major changes to it the day before a flight. Add them in for a future flight.
[08:44] <mfa298> totally up to you though.
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[08:58] <x-f> marcis_, what's the expected burst altitude?
[08:59] <marcis_> we are aiming for 25km
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[08:59] <x-f> smallish balloon?
[09:00] <marcis_> 600g
[09:00] <x-f> i see, thanks
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[16:48] <Laurenceb> any gnuplot experts here?
[16:48] <Laurenceb> http://filebin.ca/1xkdAYJxohgS/out.gp <- want to try that?
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[16:51] <Flerb_> edmoore: do you happen to remember your approach to Problem 21? (finding all pairs of amicable numbers under 10000) I've a few ideas about finding divisors through prime factorisation but I'm not sure how to go about finding all amicable numbers
[16:52] <edmoore> Flerb_, no it was literally years ago
[16:52] <edmoore> i don't even remember what an amicable number is
[16:52] <Flerb_> Oh OK. I may be overthinking a bit.
[16:53] <Laurenceb> GNUPLOT (plot_image): Number of pixels cannot be factored into integers
[16:53] <Laurenceb> WTF
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[16:54] <edmoore> x-f, did your chum launch successfully?
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[17:04] <marcis_> Hello! Can this flight be approved? : 2a309e60c56afcddc7ce8d1237ff06b4
[17:04] <marcis_> payload is tested now
[17:05] <lz1dev> !id 2a309e60c56afcddc7ce8d1237ff06b4
[17:05] <SpacenearUS> Flight 03IRBE-1 launch 10(2a309e60c56afcddc7ce8d1237ff06b4, not approved, 1 payload)
[17:05] <SpacenearUS> Project 03IRBE-1 by 03Ventspils University College
[17:05] <SpacenearUS> Window: 03Today at 21:00 UTC to 03Tomorrow at 20:59 UTC 10(Europe/Riga, +3)
[17:05] <SpacenearUS> Launch: 03Tomorrow at 06:00 UTC from 03Ventspils airport, Ventspils, Latvia 10(57.2142,21.325)
[17:05] <SpacenearUS> Raw: 12http://habitat.habhub.org/habitat/2a309e60c56afcddc7ce8d1237ff06b4
[17:05] <SpacenearUS> Payload parse status: 03IRBE1 10(16 minutes ago)
[17:05] <lz1dev> marcis_: approved
[17:05] <edmoore> marcis_, while pinging something just now i was reminded of the summary which might be good for accelerometers data
[17:06] <edmoore> min/avg/max/stddev = 0.967/4.111/9.552/3.863 ms
[17:06] <marcis_> Thanks!
[17:06] <edmoore> on a sort of 10s basis
[17:07] <marcis_> Unfortunately we will no include acceleroemter data in telemetry
[17:07] <edmoore> nevermind
[17:07] <edmoore> something for flight 2
[17:09] <marcis_> it would not make much sense, because telemetry string interval is about 10s
[17:12] <marcis_> Thanks again! We will try to post info here tomorrow
[17:13] <x-f> edmoore, not yet :)
[17:13] <edmoore> i realise now!
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[17:14] <SA6BSS> x-f: you have freq and time for tomorrow launch?
[17:15] <SA6BSS> will aim the yagi before I go to work and try to remote controll the radio from work
[17:16] <x-f> SA6BSS, 434.276 USB, 6-7 UTC
[17:16] <SA6BSS> in the morning?
[17:16] <x-f> yes
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[17:17] <x-f> 9-10am local time
[17:18] <SA6BSS> ok, I´l be at work then, I´l ceep an eye out for it.
[17:19] <x-f> great
[17:20] <SA6BSS> 25km the line of sight is 710km, Il gor abot 430km to target
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[17:21] <x-f> sounds good
[17:22] <x-f> my home network went down an hour ago, so i won't track tomorrow, as i'll get home to fix it only tomorrow evening :/
[17:23] <SA6BSS> prediction http://predict.habhub.org/#!/uuid=5ec9ac26073d8bf6b84830c14d4875a665c17630
[17:25] <x-f> i hope they will land three times slower though :)
[17:25] <SA6BSS> :)
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[17:51] <Lunar_Lander> hello
[17:51] <es5nhc> So, what's the latest version for dl-fldigi?
[17:53] <SA6BSS> http://ukhas.org.uk/projects:dl-fldigi
[17:53] <SA6BSS> if yoy want hab mode
[17:54] <SA6BSS> latest is v3.21.73
[17:54] <SA6BSS> but no hab mode in that one
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[18:04] <mfa298> es5nhc: same as it has been for a couple of years if you want a stable working version.
[18:04] <mfa298> there's a bleeding edge, but the rtty decoder seemed to go backwards
[18:06] <marcis_> some quick question - is there quick way to show azimuth and elevation of balloon for antenna tracking?
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[18:07] <Gary> gary
[18:07] <Gary> hi all
[18:07] Nick change: Gary -> Guest1810
[18:08] <DL7AD> hi Guest1810
[18:09] <Lunar_Lander> welcome to the worldwide high altitude ballooning network
[18:09] <DL7AD> has anybody every measured the power consumption of the raspberry pi b+ and the very new one?
[18:09] <Lunar_Lander> please formulate your request
[18:10] <daveake> DL7AD Try raspi.tv
[18:11] <DL7AD> daveake: thanks!
[18:12] <DL7AD> daveake: which version do you usually use?
[18:12] <daveake> A+
[18:12] <daveake> you mean for a tracker?
[18:12] <DL7AD> yeah. i have probably the worst version you could have (B)
[18:13] <Guest1810> sorry to be a pain, which was the IRC for flight approvals again I will save it this time, many thanks Gary
[18:14] <DL7AD> #habhub
[18:14] <Guest1810> thanks, and saved
[18:14] <DL7AD> np
[18:15] <Lunar_Lander> thank you for working with the worldwide high altitude ballooning network
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[18:30] <chrisstubbs> Who replaced Lunar_Lander with a bot?
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[18:31] <arko> lol
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[18:32] <Lunar_Lander> XD
[18:33] <craag> still a bit
[18:33] <craag> *bot
[18:33] Nick change: craag -> Lunar_Lander_Bot
[18:33] <Lunar_Lander_Bot> XD
[18:33] <Lunar_Lander> :D
[18:33] <Lunar_Lander_Bot> err
[18:34] <Lunar_Lander_Bot> XD
[18:34] Nick change: Lunar_Lander_Bot -> craag
[18:34] <craag> ;)
[18:34] <Lunar_Lander> yea :D
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[18:42] <Laurenceb> any graphics gurus here?
[18:42] <Laurenceb> anyone able to fix a corrupted eps file?
[18:44] <Laurenceb> http://filebin.ca/1xlWQQsBwyBt/oct-p9RmB2.eps
[18:49] <chrisstubbs> wont open in adobe illustrator
[18:49] <chrisstubbs> theres my two penneth lol
[18:51] <Vaizki> let's see
[18:53] <Vaizki> well it looks ok but I can't open it with anything either
[18:53] <Vaizki> it's from a 2006 version of GnuPlot..
[18:56] <Vaizki> hard to say what's wrong with it without spending significant time on it.. which I don't have. sorry.
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[19:14] <fxmulder_> for our HABs I generally transmit aprs at two minute intervals, is that a pretty common interval for hab tracking?
[19:21] <Reb-SM0ULC> every 4-5 min i guess is more common
[19:22] <Reb-SM0ULC> depends on float etc.. :)
[19:22] <fxmulder_> is that still trackable when it comes down? I figure it's harder to track once its on the ground and can cover a lot of vertical distance in 4-5 min
[19:23] <fxmulder_> horizontal distance that is
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[19:34] <mfa298> fxmulder_: how often you transmit might need to depend on what WIDE settings you're using, what the bits of network you might hit are like and how busy they are.
[19:35] <mfa298> having it hit a busy network with bad settings regularly might upset a lot of other APRS users.
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[19:48] <SpeedEvil> How do you tell when an APRS user is upset?
[19:49] <edmoore> SpeedEvil, he decides to packet in?
[19:49] <SpeedEvil> :)
[19:51] <Lunar_Lander> :D
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[20:06] <maounis> Hi. Is it possible to use pocketpacket with FCDpro+ on a MAC? Anyone doing this?
[20:07] <maounis> Any other ideas on decoding APRS/RTTY with FCDpro+ on a MAC?
[20:08] <mfa298> SpeedEvil: you don't have to tell, they're always upset ;)
[20:09] <lz1dev> maounis: sell mac, buy pc
[20:10] <lz1dev> hell you can probably buy 2x pc
[20:10] <maounis> Ha! Good idea! :) Really, I have no hope at all?
[20:11] <edmoore> i'm sure it's possible. just you probably haven't caught anyone who's done it on here at the right time
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[20:14] <maounis> Yes this is true. I've used FCDpro+ before in Windows and SDR# for decoding RTTY, but what do you use for APRS decoding in Windows?
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[20:23] <fxmulder_> well my query is more concerning whether 2 minute interval txing is good enough for tracking low to the ground, regardless of the mode
[20:24] <fxmulder_> we've sent up both an aprs transmitter and SPOT and both times the spot has given us much better information as we haven't been close enough to pick it up towards the ground
[20:25] <fxmulder_> we'll probably continue to use the spot until we have a good record of tracking it otherwise
[20:26] <fxmulder_> maybe it just means we need better directionality on our ground equipment
[20:27] <bradfirj> fxmulder_: Perhaps some code to up your transmit to every 10s after a soft arm of passing say 3000m?
[20:27] <bradfirj> So if it goes up and then down again, start screaming until you find it? :p
[20:29] <bradfirj> Or perhaps a 10s continuous tone for you to direction find against
[20:29] <bradfirj> Although one should be wary of annoying everyone else on the band
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[20:29] <fxmulder_> that's another alternative, I use a tm-d700 which I think it strict about ax.25 crc, maybe set something up that can read corrupt data
[20:31] <bradfirj> That looks like a nice radio, surely it has a "big dumb SSB receiver" mode?
[20:32] <bradfirj> To go hunting for a warble, or perhaps a simpler telemetry mode once it suspects it's on the ground
[20:33] <mfa298> fxmulder_: if you're doing rtty on a dedicated frequency you could do it continuously (which is what most UK flights do using the ISM band we have here - the only way we can do airborne)
[20:37] <fxmulder_> I've been using aprs here in the US because of the abundance of aprs digipeaters but something like that might be a good alternative
[20:37] <fxmulder_> or maybe a mix based on altitude
[20:37] <bradfirj> fxmulder_: You can use the 900MHz ISM band in region 2, I think there's a radiometrix transmitter for that band
[20:38] <bradfirj> Which is otherwise identical to the one all the tutorials are written for
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[20:43] <fxmulder_> what band is used in the UK for ISM rtty?
[20:44] <fxmulder_> 70cm I suppose
[20:44] <bradfirj> yep
[20:46] <fxmulder_> any reason not to use the lower bands such as 40.680 MHz ?
[20:47] <bradfirj> The radio experts in here should chime in shortly but I think part of it is how easy it is to make a 1/2 wave antenna and run it inside a chase air
[20:47] <bradfirj> car*
[20:48] <bradfirj> As well as that, the bandwidth available on the 70cm band is considerable
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[20:49] <mfa298> as our 70cm ISM band overlaps the AR band there's good receivers avaialble and plenty of people with good kit.
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[20:49] <mfa298> plus the antennas are nice and short.
[20:50] <Reb-SM0ULC> fxmulder_: activate shorter period when under 1000 m ?
[20:50] <bradfirj> Am I right in saying that the shorter wavelength reduces interference from other equipment in that band?
[20:50] <mfa298> someone did try some HF ISM but it didn't work well as a decent antenna ends up being much longer (which didn't fit what he was doing) and there's a lot more noise on those ISM bands
[20:50] Action: Reb-SM0ULC can't read the log... sri...
[20:50] <bradfirj> Due to poor propagation at ground level
[20:51] <mfa298> fxmulder_: assuming your licensed (which you must be for aprs) you could always use rtty using an AR callsign and band.
[20:51] <mfa298> UK can't use AR airborne hence the use of the ISM band
[20:52] <bradfirj> For *reasons*
[20:54] <Reb-SM0ULC> fxmulder_: also good to include the "default" beep very 3-5 seconds or so
[20:57] <bradfirj> Speaking of mr mulder here
[20:57] <bradfirj> I'm off to watch some x files, thanks for the inspiriation stranger
[20:57] <bradfirj> o/
[20:57] <bradfirj> too many is in that work, eh
[20:57] <bradfirj> word*
[20:59] <fxmulder_> bradfirj: hah good deal
[21:00] <fxmulder_> Reb-SM0ULC: yeah directional beeps might be something to work off of
[21:00] <fxmulder_> maybe I need to explore other band offerings
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[21:04] <mfa298> continuous rtty would also give the direction finding option if all else fails
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[21:33] <Laurenceb_> the hyperloop paradox: the longer you look at hyperloop the more retarded it seems
[21:34] <superkuh> I think that applies to everything, ever.
[21:34] <Laurenceb_> yet it only takes a finite amount of time for you to realise that it infinitely stupid
[21:35] <Laurenceb_> today i discovered that a conventional train can go ~mach1 with active suspension
[21:35] <Laurenceb_> so there is literally no point to hyperloop
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[21:49] <SpeedEvil> You mean in a low-density atmosphere?
[21:49] <SpeedEvil> for drag reduction?
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[21:57] <Ian_> Shame about the track though . . .
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[22:29] <serNicks> Hey people, I was coming here to ask about documentation about the ukhas protocol, but I just found it. figured i'd say hi anyway!
[22:30] <craag> Hello!
[22:30] <fsphil> evening :)
[22:30] <craag> .se = sweden?
[22:31] <serNicks> sweden yeah!
[22:31] <craag> Nice :) Planning a hab launch over there then?
[22:32] <serNicks> well, sort of. I've already done two successful launches with a friend, using an APRS transmitter - figured it's time to build my own tracker
[22:33] <serNicks> or transmitter, rather
[22:33] <craag> Oh cool
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[22:33] <craag> RTTY does have some nice advantages
[22:34] <serNicks> yeah! i've got some arduino experience but I've just gotten started with "barebone" AVR so i'm gonna try that route
[22:34] <craag> barebone AVR is good - that's the route I mostly take now.
[22:34] <craag> Starting to use stm32 too
[22:35] <serNicks> i've got a NTX2 (1st gen) and figure i'll try PWM to generate the tones instead of the resitor divider technique
[22:36] <craag> By all means give PWM a go - we are suggesting people use the resistor technique now as it leaves the AVR timers free for other stuff.
[22:36] <serNicks> stm32 looks interesting, surface mount stuff i scary though :P
[22:36] <craag> There's some really cheap F0 TSSOPs
[22:37] Nick change: fl_0 -> fl_0|afk
[22:37] <craag> (STM32F0)
[22:37] <serNicks> nice. i'll got to sm eventually
[22:38] <craag> eg. http://uk.farnell.com/stmicroelectronics/stm32f030f4p6tr/mcu-32bit-cortex-m0-48mhz-tssop/dp/2432084RL
[22:39] <craag> ha MOQ 150, well they're 76p for x1.
[22:39] <craag> But barebones AVR is a good first step
[22:39] <craag> ARM can be a lot more complex.
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[22:41] <serNicks> yeah. if not the programming then just designing the circuit board
[22:42] <craag> Are you making a PCB for your tracker?
[22:42] <serNicks> i figure i may aswell. I'm studying EE so it's sort of a way to put theory into practise
[22:43] <craag> Great :)
[22:44] <serNicks> yup, it's going to be a fun project. then I'll probably lose it all on the first flight but hey, that's part of the game
[22:44] <craag> Well do ask on here if you need any help - a few of us started designing PCBs by making HAB trackers
[22:44] <serNicks> for sure!
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[22:45] <serNicks> i've got means to manufacture my own pcbs so there's room for mistakes, thankfully
[22:46] <serNicks> though i've heard people eventually give up on that and have their designs made professionally
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[22:47] <craag> There's a few cheap chinese fabs, that if you're ok waiting a couple of weeks, can do 10x boards for $20 or less.
[22:47] Nick change: heathkid|2 -> heathkid
[22:48] <serNicks> heh, may aswell make 10 if you're gonna lose a few
[22:48] <craag> eg. http://www.hackvana.com/store/ http://dirtypcbs.com/
[22:48] <serNicks> though losing the ntx2 would be a little painful given its price
[22:48] <serNicks> nice^^
[22:49] <craag> Yeah don't aim to lose it ;)
[22:49] <craag> We have a rather good record with RTTY and the Habhub prediction tools
[22:50] <serNicks> hehe. we'll probably keep the APRS tracker on future flights, can't hurt to have redundancy
[22:50] <craag> Oh yeah, backup is good - particularly one that uses local unattended infrastructure.
[22:51] <craag> We mainly started using RTTY as we can't use amateur radio airborne here.
[22:51] <craag> But the 100% duty cycle and higher link budget does have it's advantages.
[22:52] <serNicks> indeed. one of the main reason i've looked into building my own i tracker is actually the fact that aprs dislikes frequent transmissions
[22:53] <serNicks> i used a transmission interval of something like 30 sec on the first flight - not good
[22:53] <craag> Haha I bet that annoyed some people :P
[22:54] <serNicks> luckily sweden is rather desolate and aprs not widely used :P
[22:55] <serNicks> but yes, i got quite a few congestion warnings and such
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[23:00] <Laurenceb_> http://i.imgur.com/IrurN8Zh.jpg
[23:01] <SpeedEvil> :)
[23:01] <serNicks> do you need permission from authorities to launch in the UK?
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[23:05] <bradfirj> Are there any chinese fabs who can do assembly for workable fees?
[23:05] <Laurenceb_> what do you mean by assembly?
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[23:05] <bradfirj> I have a few QFN, BGA ANDCHIP SCALE parts I would love to try but no means to assemble them
[23:06] <Laurenceb_> doable with solder mask
[23:06] <bradfirj> No oven
[23:06] <bradfirj> Well, short of creating one :p
[23:06] <Laurenceb_> use a hot air tool
[23:06] <serNicks> of course, the wiki answered my question
[23:07] <bradfirj> Can you do a BGA with hot air?
[23:08] <Laurenceb_> yes
[23:08] <Laurenceb_> proving its a small BGA
[23:08] <Laurenceb_> providingf
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[23:09] <bradfirj> I think all but a few of the parts I wanted to try are actually available in big QFNs so it might be worth a try
[23:10] <Laurenceb_> QFN is pretty easy to hot air
[23:11] <bradfirj> I can hand solder down to .65 but I haven't gone smaller
[23:11] <bradfirj> with pins that is
[23:12] <Laurenceb_> http://www.dogeos.net/
[23:12] <Laurenceb_> wow internet
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[23:18] <SpeedEvil> OS, coins, cushions, what more could you want
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[00:00] --- Fri Apr 10 2015