highaltitude.log.20150807

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[07:49] <SpacenearUS> New position from 03BUZZ14 after 033 days silence - 12http://tracker.habhub.org/#!qm=All&q=BUZZ14
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[08:07] <SpacenearUS> New position from 03CLOUD8 after 032 days silence - 12http://tracker.habhub.org/#!qm=All&q=CLOUD8
[08:07] <SpacenearUS> New position from 03CLOUD9 after 032 days silence - 12http://tracker.habhub.org/#!qm=All&q=CLOUD9
[08:18] <SpacenearUS> New vehicle on the map: 03CALLSIGN123_chase - 12http://tracker.habhub.org/#!qm=All&q=CALLSIGN123_chase
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[09:39] <Geoff-G8DHE> Two BUZZ'z then ?
[09:40] <daveake> 1
[09:40] <Geoff-G8DHE> Ah the other has gone ;-)
[09:41] <daveake> ?
[09:41] <Geoff-G8DHE> There is a BUZZ and a BUZZ14 in habitat, suspect you hanged the callsign ?
[09:42] <Geoff-G8DHE> or even changed
[09:45] <daveake> earlier flight doc
[09:45] <Geoff-G8DHE> any video stream today ?
[09:46] <Geoff-G8DHE> Ah no it says in the annoucment
[09:47] JR-RPF (d9217fae@gateway/web/freenode/ip.217.33.127.174) joined #highaltitude.
[09:50] <JR-RPF> Anyone able to help with a dl-fldigi query, receiving from a PITs board via MVT-7100. Waterfall looks right and data being recieved, but not decoded. http://imgur.com/TUZhLcq
[09:50] <JR-RPF> Audio via laptops composite audio connector
[09:51] <edmoore> try hitting 'Rv' in the bottom-right hand corner of fldigi
[09:51] <Geoff-G8DHE> looks a reasonable setup at first glance
[09:53] <Geoff-G8DHE> Are you sending images or just telelmetry ?
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[09:54] <JR-RPF> got it "RV" did it
[09:56] <JR-RPF> THanks
[09:56] <JR-RPF> different issue..
[09:58] <JR-RPF> I have a few MVT-7100 to test, one one them receives nothing unless one of the others is on...
[09:59] <Geoff-G8DHE> ? that seems a little odd, any otherinfo ?
[10:00] <Geoff-G8DHE> are they physically connected in any way ?
[10:01] <mfa298> frontend gone and picking up via IF perhaps, although seems a bit unlikely
[10:01] <JR-RPF> not at all connected
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[10:02] <Geoff-G8DHE> No signals at all in any other band, or no noise present ?
[10:05] <JR-RPF> Just static, flickering sound. No signal "bars" at the bottom of the screen...
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[10:06] <Geoff-G8DHE> When the other set is on does it "hear" what the other is hearing or can it be tuned itself ?
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[10:06] <JR-RPF> hmm screen flickering and complaining about batt
[10:07] <JR-RPF> Think it might be hearing what other set its hearing
[10:07] <Geoff-G8DHE> then might be mfa298 suggestion
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[10:08] <Geoff-G8DHE> do they have to be very close together for it to work then ?
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[10:10] <JR-RPF> yeah witihin 10-15cm
[10:11] <Geoff-G8DHE> that's a bit worrying then relating to screening around them!
[10:11] <tweetBot> @G8DHE: HAB: A flight to day CLOUD8,9 & BUZZ14 tracking http://t.co/fGxWq3Jntl* #ukhas #hab
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[10:14] <JR-RPF> Just played a bit futher, 2nd radio can be tuned away, but only gets static
[10:14] <JR-RPF> moving the 2nd radio really affects the signal
[10:14] <JR-RPF> is it dead?
[10:14] <Geoff-G8DHE> it needs repair!
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[10:25] <PE2BZ> !flights
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[10:27] <Geoff-G8DHE> !flights
[10:28] <Geoff-G8DHE> !payload
[10:28] <Geoff-G8DHE> !payload 1234
[10:28] <Geoff-G8DHE> bot-less
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[10:31] <PE2BZ> Good morning Geoff , System error ?
[10:31] <Geoff-G8DHE> Think the Bots are asleep still
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[10:32] <PE2BZ> !bots awake ;-)
[10:34] <SpacenearUS> 03PE2BZ: Current flights: 03CLOUD9/BUZZ 10(7246)
[10:35] <PE2BZ> !payload 7246
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[11:05] <Geoff-G8DHE> !flights
[11:05] <SpacenearUS> 03Geoff-G8DHE: Current flights: 03CLOUD9/BUZZ 10(7246)
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[11:17] <Geoff-G8DHE> There off
[11:19] <craag> So I've got the websdr pi set up, and a pi in the car on a magmount at home in southampton..
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[11:20] <craag> both should work automatically... must...not...ssh...in
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[11:23] <daveake> up
[11:25] <craag> websdr got it :)
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[11:29] <SpacenearUS> New vehicle on the map: 03BACON_chase - 12http://tracker.habhub.org/#!qm=All&q=BACON_chase
[11:32] <PE2BZ> !payload buzz14
[11:32] <SpacenearUS> 03PE2BZ: Payload 03BUZZ 10(7246) 03$$BUZZ14 - 03MTX2 P&P - 03434.2 MHz USB 03RTTY 50/425Hz ASCII-7 none 2
[11:39] <gonzo_> what's cloud9? lora or rtty?
[11:41] <Geoff-G8DHE> Cloud 9 LoRa
[11:52] <SpacenearUS> New vehicle on the map: 03M0RPI_chase - 12http://tracker.habhub.org/#!qm=All&q=M0RPI_chase
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[12:02] <craag> cloud9 coming in intermittently on 434.456
[12:03] <Geoff-G8DHE> likewise
[12:06] <JamesWT> Hi guys, I'm from the UK Students for the Exploration and Development of Space (UKSEDS) and I'm putting together the packs that we send out to branches in time for university freshers weeks. Quite a few of our branches are interested in high altitude work, so I was hoping to include some promotional material for UKHAS in the packs. Is there somewhere I could find a branded flyer or the like? Thanks!
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[12:07] <craag> I don't think we have any flyers - we've never 'advertised' before :P
[12:07] <Geoff-G8DHE> The Wiki and the IRC are the main info resources
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[12:08] <craag> JamesWT: Try dropping an email on the mailing list, someone might be able to whip up a quick info flyer or something for you.
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[12:08] <craag> https://groups.google.com/forum/#!forum/ukhas
[12:09] <JamesWT> Would it be okay for us to create a flyer with the balloon logo and wiki/irc links?
[12:09] <JamesWT> Okay thanks I'll have a look at that as well.
[12:09] <craag> I think that would fine :)
[12:09] <craag> There's high res copies of our logo on the wiki
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[12:11] <Upu_M0UPU> o7
[12:11] <craag> We (southampton university spaceflight society) might be interested in a flyer like that too to hand out :)
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[12:17] <SpacenearUS> New vehicle on the map: 03M0UPU_chase - 12http://tracker.habhub.org/#!qm=All&q=M0UPU_chase
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[12:33] <SpacenearUS> New vehicle on the map: 03KM4FSW-12 - 12http://tracker.habhub.org/#!qm=All&q=KM4FSW-12
[12:35] <PE2G> PE2BZ: How's reception?
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[12:40] <PE2BZ> PE2G Very very bad....
[12:40] <PE2G> PE2BZ: QRM?
[12:40] <PE2BZ> PE2G qrm dwars door een telemetrie signaal heen
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[12:41] <PE2G> Same here QRM spot on .200 and .250, clear around those freqs
[12:42] <PE2G> Dave trying to force us onto LoRa ;)
[12:42] <PE2BZ> Tried to request 12.5 kHz frequencies in between on the UKHAS but no replies. Try to pick up some LoRa signals, the Pi add on is on its way.
[12:45] <PE2BZ> In the mean time, I am distracted because of the arrival by mail of my PortaPack add on for the Hack RF. It makes it a portable SDR, with headphone out, FSK, NFM, AM and WFM demodulator and touchscreen.
[12:45] <PE2G> Nice.
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[12:52] <craag> ooo got a CRC fail on the chasecar lora rx
[12:53] <craag> !whereis CLOUD9
[12:53] <SpacenearUS> 03craag: 03CLOUD9 is over 03West Midlands, UK 10(52.59625,-2.17834) at 0331968 meters
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[12:56] <mattbrejza> craag: has the afc screwed up?
[12:57] <PE2BZ> pe2g : Portapack, with indoor antenna, just for show: http://imgur.com/W2QS1N4
[12:57] <craag> I've manually set it to 434.455
[12:57] <craag> 2 more crc fails
[12:57] <craag> so it's getting the packets
[12:57] <craag> just not enough snr yet...
[12:57] <craag> !whereis CLOUD9
[12:57] <SpacenearUS> 03craag: 03CLOUD9 is over 03Staffordshire, UK 10(52.59741,-2.21038) at 0334104 meters
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[12:57] <mattbrejza> havnt you been recieving for a while though?
[12:57] <craag> websdr one has
[12:58] <mattbrejza> i see that its 20kHz so even 2kHz off can cause CRC errors through mismatches
[12:58] <craag> this is on the magmount on my car, parked on my drive in soton
[12:58] <mattbrejza> i would expect that to get stuff still
[12:58] <craag> rubbish view to the north :(
[12:58] <Geoff-G8DHE> Mine reporting 434.4520 at the moment
[12:58] <mattbrejza> do you know what the offset error is?
[12:59] <craag> not on this module
[12:59] <Geoff-G8DHE> yup that's the problem all slightly different!
[12:59] <mattbrejza> i think i would use 44kHz 10%DC if i had to pick one mode
[12:59] <mattbrejza> for telemetry
[12:59] <PE2G> BUZZ burst
[13:05] <Upu_M0UPU> it has
[13:08] <craag> can someone with ipv6 check http://websdr.suws.org.uk/ for me please?
[13:08] <craag> (that it loads, ie. I've got the right IP)
[13:08] <mattbrejza> loads here
[13:09] <craag> thanks :)
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[13:17] <tweetBot> @philcrump2: The Farnham WebSDR is fixed! New LF Antenna and new 6m band in addition to 2m, 70cm, and 10GHz. http://t.co/CFG5gTpMxN #hamr #ukhas #amsat
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[13:40] <TROUPYS> hi all,
[13:41] <TROUPYS> Bit of advice, i have a connector question, long story but I have a sma plug terminated cable RG56 that I now need to get into a MCX socket. No adapter but I do have a very small cable attached to an mcx Plug.
[13:42] <TROUPYS> Question is, launch is tomorrow, do I try to connect the two cables and risk a poor mobile signal or sacrifice my base receiver in favour of taking the airspy radion in the car connected to a magmount?
[13:46] <gonzo_> oooh, some power cables there
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[14:13] <PE2BZ> TROUPYS I would go for the solder connection of the RG58 (56 ?) to the mcx cable. Myself I just place the cables parallel, fix them with a tyrap to each other, solder core to core, isolate with crimp foil , solder shield to shield, isolate with crimp foil, and then crimp both the connections and the 2 cables in crimp foil. Does that make sense ?
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[14:17] <tweetBot> @AmsatUK: M0NRD Balloon Talk tonight at Hucknall Rolls-Royce Amateur Radio Club http://t.co/zAwbI4STru #hamradio #hamr #ukhas https://t.co/xElB4rIPVU
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[14:20] <ntx2> Hi - I need some help decoding my transmissions.....
[14:21] <ntx2> I was able to successfully decode the transmissions on dl fl-digi when the baud rate was 150
[14:21] <ntx2> now I changed to 300 to support ssdv and I am just unable to properly decode them
[14:22] <fsphil> you got both the transmitter and receiver on 300?
[14:22] <ntx2> I am sending "Testing the transmission. Please standby" and I get
[14:22] <ntx2> -Testing te-xrAhcmkro.-@LeasE ctdBy------------<-----------------------Pest$l t-E TrAf'n----R-+-#----- z------------------------Paifth`prnr,ibsio.."eQe stndby----esping the-traNsmarsign. PleAse staLdBy-T
[14:22] <ntx2> yes, they are both on 300
[14:22] <fsphil> nice
[14:22] <fsphil> can you post a screenshot of dl-fldigi
[14:22] <ntx2> sure
[14:23] <ntx2> http://imgur.com/inp07rO
[14:23] <fsphil> that signal is very weak
[14:23] <fsphil> actually looks like you might be recording from your mic
[14:24] <fsphil> I've done that a few times
[14:24] <fsphil> do you see lines if you whistle?
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[14:24] <Upu_M0PU> We are just waiting for Dave to turn up
[14:24] <ntx2> no
[14:24] <fsphil> hmm not that then
[14:25] <Upu_M0PU> GPS on my phone went totally wonky had to reboot it
[14:25] <fsphil> ntx2: can you also post a screenshot of gqrx
[14:25] <ntx2> http://imgur.com/BGY9p4g
[14:25] <Upu_M0PU> was +/- 5 miles
[14:25] <ntx2> was just doing that
[14:25] <fsphil> hmm that looks fine
[14:25] <TROUPYS> PE2BZ Only thing I am unsure of is crimp foil, is there a sub stitute of regular foil??
[14:26] <fsphil> ntx2: can you run pavucontrol, it should show you what dl-fldigi is recording from
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[14:26] <ntx2> in the meantime
[14:26] <ntx2> dl fl-digi has completely lost
[14:26] <ntx2> ---ZB-.-X----'-- ----m-8l-v-Q-K^---q--D---|---n---BC;#Bs--_--ko-> Pf-!nS----------D------------v---{@------------------t-tkJ thF---? w--9-2s#----------:---------`------T-wT--w`hg4n/~-J--wg-uTsnd----------o----------}-----F---21------7----!-j-----7I-5Of--J!l- -- 5A--C---J-E-&---~-----r--x --)sS|.-wq----| g----dK-------W------o----R73-_---8-)-V%`b- 4---bA---i}dM--Q---,?-x}{-u %9d"--d-BZH c-NBY--5-------- \-dv---l l--5--S--"X--L--&:ON
[14:26] <ntx2> previously you could see some semblance of the transmitted message but now it is just junk
[14:27] <fsphil> yea, the problem is between gqrx and dl-fldigi
[14:27] <ntx2> pavucontrol is not installed
[14:27] <ntx2> should I install it?
[14:27] <fsphil> yea go for it
[14:27] <fsphil> useful program to have
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[14:31] <ntx2> http://imgur.com/Rwzitvx
[14:31] <ntx2> view from the pavucontrol
[14:31] <fsphil> the built-in adio analog stereo will be recording from either your mic or line-in
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[14:31] <fsphil> you can change it so that it records the output of that
[14:31] <fsphil> can't remember what it's called
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[14:32] <ntx2> http://imgur.com/lMkb84x
[14:32] <fsphil> "Monitor of ..."
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[14:33] <ntx2> there are two
[14:33] <ntx2> monitor of analog audio
[14:33] <ntx2> and digital audio
[14:33] <fsphil> it'll probably be the analogue one
[14:33] <fsphil> but you can try both
[14:34] <ntx2> wow
[14:34] <ntx2> thats what I did
[14:34] <ntx2> it was the analog one
[14:34] <ntx2> what a difference that makes
[14:34] <fsphil> there is an oddity I've seen when using pulseaudio this way, where it will sometimes garble the data - hopefully you won't see it
[14:35] <ntx2> http://imgur.com/2uP4VYJ
[14:35] <ntx2> check out dl fl-digi now
[14:35] <fsphil> sweet
[14:35] <ntx2> thanks a LOT
[14:36] <ntx2> so what was it doing?
[14:36] <fsphil> it was recording from one of your sound cards input
[14:36] <fsphil> either the microphone or line-in
[14:36] <ntx2> I mean, couldn't I have changed the input into dl fl-digi from within its settings?
[14:36] <ntx2> why did we need the pulseaudio controller?
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[14:37] <fsphil> dl-fldigi can select which device it records from, but not what it records
[14:37] <fsphil> though it probably could be made to
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[14:38] <ntx2> so from where it is recording, there were multiple sources?
[14:38] <ntx2> I thought that if it is recording from a device, it records whatever the device sends....?
[14:38] <fsphil> yea the Monitor thing in PA is all the sound output from your sound card
[14:39] <fsphil> so if you started playing music in another program it would hear that as well
[14:39] <fsphil> gqrx can output its audio directly through UDP, but dl-fldigi can't use that yet
[14:39] <fsphil> I did try hacking it on but only got part of the way through it
[14:40] <fsphil> sample rates are different (gqrx outputs 48khz, fldigi expects 8khz)
[14:41] <fsphil> working with fldigi's code is quite painful
[14:42] <Somisary> hi there, im trying to get started with high altitude ballooning and was wondering if there were any recommendations for a good battery pack to use with the raspberry pi?
[14:43] <RealBorg> Somisary, I plan on using 18650 batteries and maybe usb step-up converters
[14:43] <RealBorg> most of pi will work on 3.7V
[14:44] <fsphil> energizer lithium ultimates are popular, combined with a voltage regulator should work well
[14:44] <ntx2> thanks for that info
[14:44] <ntx2> I am glad that my decoding is going well now
[14:44] <ntx2> regarding batteries, I am using one of those cell phone battery packs of 6000mAH
[14:45] <Somisary> well it looks like i'm going to have to do some reading about voltage regulators
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[14:48] <ntx2> Somisary: something like this should work - http://www.amazon.com/KMASHI-15000mAh-Ultra-High-External-Motorola/dp/B00JP8MZGK/ref=zg_bs_7073960011_2
[14:48] <ntx2> why do you need voltage regulator?
[14:48] <fsphil> I don't trust usb connections on hab flights
[14:48] <mattbrejza> for hte pi you can just connect 3xAA into 5V
[14:49] <ntx2> why USB connections are not trusted?
[14:49] <ntx2> I am now curious
[14:50] <fsphil> I'd be afraid of them working loose
[14:50] <Somisary> sorry, im in the uk, but how would something like this do? http://www.amazon.co.uk/TeckNet-12000mAh-Portable-External-Motorola/dp/B00A0NALHE/ref=sr_1_7?ie=UTF8&qid=1438944315&sr=8-7&keywords=power+bank
[14:51] <fsphil> people have flown usb cameras fine so it's certainly possible
[14:51] <fsphil> those battery packs may not work too well in the cold either - though they won't be there too long
[14:52] <mfa298> a lot of people have the preference for the Energizer Ultimate Lithium as they're known to work happily down to low temperatures.
[14:52] <fsphil> they also need to be switched on
[14:52] <fsphil> manually
[14:52] <fsphil> what if they power off in flight? :)
[14:53] <Somisary> i may not be understanding, but couldn't you just tape the usb or something to stop it coming loose?
[14:53] <fsphil> yep
[14:53] <ntx2> fsphil: Your point of switch off and on is a good one
[14:53] <ntx2> I have one such batttery
[14:54] <ntx2> but a friend of mine did a successful launch with a USB battery pack
[14:54] <Somisary> why would they power off in flight?
[14:54] <fsphil> yea they will probably work
[14:54] <ntx2> and that did not have a power button :)
[14:54] <fsphil> box gets bumped? stray high energy partical? who knows
[14:55] <ntx2> good question - as long as the cable is connected, why should it disconnect?
[14:55] <Geoff-G8DHE> A bad bouncy launch or the shock and burst can do nasty things to switches, plugs and sockets
[14:55] <fsphil> the point being that if it did switch off, it isn't coming back on
[14:55] <fsphil> it's a pretty big failure mode
[14:57] <fsphil> but yes it might work fine too. just seems riskier
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[14:57] <mattbrejza> powering cameras is probably fine with usb as its just as a backup, rather than the pi which wont tolerate even a <1s glitch
[14:57] <ntx2> I agree...we should use a battery pack which does not have one of those power buttons :)
[14:58] <Somisary> to be honest, my inexperience with the hardware would probably make the alternatives even more likely to fail
[14:58] <mattbrejza> if you do you usb make sure its a decent cable
[14:58] <fsphil> a small pack of energier lithiums > 5v regulator > gpio header on the Pi is pretty simple
[14:58] <mattbrejza> and if youre powering cameras it stays pretty warm in the box anyway
[15:00] <Ian_> Ultimate Lithium batteries are recommended because they are HAB flight proven over several years. My advice, forget the usb battery packs, they are expensive, heavy and likely to be unreliable. Which is why they are not flown as standard.
[15:02] <Somisary> do you know if there is a good source for implementing such a set up?
[15:03] <Somisary> i really am incredibly new to this sort of thing, im more used to software
[15:03] <mattbrejza> are you just powering a pi?
[15:03] <mattbrejza> +camera+radio+gps etc
[15:03] <mattbrejza> (picam)
[15:03] <Somisary> pi, camera, radio and gps yes
[15:03] <mattbrejza> you can connect 3xAA in series and connect that directly to the pis 5V rail
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[15:04] <mattbrejza> since the pi has a switchmode psu it really doesnt care if its 3.6-5.4
[15:04] <Somisary> oh, as easy as that?
[15:04] <Somisary> ok, well i shall give that a go
[15:04] <Somisary> thanks!
[15:05] <fsphil> ah yes the modern Pis do that
[15:05] <Geoff-G8DHE> Have you seen daveake blog ? http://www.daveakerman.com/?p=1732
[15:05] <mattbrejza> oh yes, make sure its a B+
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[15:05] <mattbrejza> (not that itll break the old ones)
[15:05] <fsphil> that might work on the older Pis too actually, they have regulators though they're not terrible good
[15:05] <fsphil> terribly*
[15:06] <fsphil> since the 5V isn't used by anything on the Pi itself
[15:06] <mattbrejza> the dropout is like 1.2V? so thats vmin=4.5, which is more than pushing it
[15:06] <fsphil> yea they where pretty awful
[15:06] <Somisary> i have been looking at that blog yes
[15:06] <Somisary> oh, B+ not A+?
[15:06] <fsphil> A+ too
[15:07] <mattbrejza> the only potential issue is there is one pin on the pi connected to 5V (for monitoring or something, its not important), but i dont know what hte max voltage limit is
[15:07] <fsphil> I might try this on the bench psu later
[15:07] <mattbrejza> dropout?
[15:07] <fsphil> yea
[15:07] <fsphil> on the A+
[15:07] <fsphil> see how low it can go
[15:07] <mattbrejza> we tried it on the A+, it was a couple 100mV, was impressed
[15:08] <mattbrejza> will be load dependant though...
[15:08] <fsphil> ah sweet
[15:08] <fsphil> yea
[15:08] <mattbrejza> i think we had to go below 3.3V before the pi got sad
[15:08] <fsphil> that's fine for 3x lithiums
[15:10] <mattbrejza> what is usual for the pits?
[15:10] <mattbrejza> i think the reg allows like 1->15V
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[15:11] <fsphil> yea 15v top, can't recall what the min is
[15:11] <fsphil> shop says 2.8 to 15v
[15:12] <fsphil> empty voltage of 3x ultimate lithiums is 3.6v
[15:13] <fsphil> at 100mA anyway. drops of the cliff after that
[15:13] <mattbrejza> they drop in the cold though
[15:14] <fsphil> only for higher currents
[15:14] <fsphil> http://data.energizer.com/PDFs/l91.pdf
[15:14] <fsphil> the 25 mA curve is pretty flat
[15:14] <mattbrejza> well ive noticed on trackers the battery voltage follows temperatire
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[15:14] <fsphil> 250mA might be more accurate for a Pi flight though
[15:14] <mattbrejza> which doesnt necessarily mean less capacity though
[15:15] <mattbrejza> it doesnt give discharge profiles with different temperatures
[15:16] <fsphil> yea just effects on capacity vs/ temp
[15:18] <Somisary> is there a big difference when it comes to using the A+ or B+ for tracking?
[15:19] <mattbrejza> 'tracking'?
[15:19] <mattbrejza> in the payload or on the ground?
[15:19] <mattbrejza> (usually we refer to 'tracking' as what happens on the gound)
[15:19] <Somisary> oh sorry
[15:19] <Somisary> the payload
[15:20] <fsphil> tracker can also refer to the payload
[15:20] <mattbrejza> tracker = balloon side, tracking = ground side ;)
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[15:20] <mattbrejza> the B+ uses more current, unsure how much
[15:21] <fsphil> A+ is cheaper too
[15:21] <fsphil> and smaller
[15:21] <fsphil> it's unlikely you'll need four USB ports and ethernet :)
[15:21] <Somisary> so probably the A+ then
[15:22] <Somisary> thanks again :D
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[15:31] <ddg_> hi all
[15:31] <ddg_> have a newbie-ish question around a vhf beacon tracking problem and was referred to here
[15:31] <ddg_> if anybody is around
[15:32] <mfa298> there's (almost) always someone around
[15:32] <mfa298> it's usually best to just ask the question, then people know if they can help or not (or might suggest waiting for someone else)
[15:33] <ddg_> thx will do
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[15:34] <ddg_> Im dealing with a problem where I need to detect VHF beacons transmitting in the 142-144MHz range (40 pulses per minute, each pulse 10ms long)
[15:34] Nick change: fl_0 -> fl_0|afk
[15:34] <ddg_> so been looking into SDR / spectrum analyser systems. But Im not really a radio guy
[15:34] Nick change: fl_0|afk -> fl_0
[15:34] <ddg_> and there are many choices out there, so just looking for some guidance
[15:35] <ddg_> a friend suggested I post here but apologies if this is felt like out of scope
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[15:45] <mfa298> for detecting manually one of the SDRs might do, They range from $10 for the rtlsdr's to a few hundred $ for some of the better ones.
[15:45] <mfa298> Funcube Pro+ / Airspy are probably the next best in terms of performace / price
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[15:53] <ddg_> @mfa298: thanks I had came across Funcube/Airspy and planned to contact each to check if they would fit
[16:04] <mfa298> It's likely to depend on how you're wanting to use them, With any of those three you can use the same software to look at the radio spectrum so the only difference is in what the hardware is like.
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[16:05] <mfa298> the rtlsdr's are cheap and aren't as sensitive as the other options (but they are very cheap). For your use case I'm not sure the Funcube would have much benefit over the Airspy.
[16:06] <ddg_> ok, gotcha, will dig a bit deeper into the airspy in any case
[16:07] <mfa298> For other things the Funcube goes to much lower frequencies and has dedicated filters for some bands (but for 142-144 you might be just outside the filter range)
[16:11] <ddg_> ok, any insight into the airspy community, documentation & how easy to program against?
[16:14] <craag> ddg_: Out of interest, are you the same guy currently lurking in #g3kmi on ECS server?
[16:17] <ddg_> ah yes, sorry, lost track of that window :)
[16:17] <craag> :)
[16:17] <craag> you from the uni?
[16:17] <ddg_> used to work at uni
[16:17] <craag> ah
[16:18] <craag> re: your question, easiest thing would be to interface to the dongle with something like 'sdr#', then process the demodulated audio output from that
[16:18] <ddg_> In any case thanks all for the info, it is enough to get me going another level
[16:18] <craag> saves you messing around with dongle drivers and i/q maths
[16:19] <ddg_> indeed. Note though I am space/power constrained and was planning to do this via a RPi / Odroid or similar
[16:19] <craag> ah i sse
[16:19] <craag> you're just after an on/off signal?
[16:20] <ddg_> no experience with sdr#, seems c#, windows requirement?
[16:20] <craag> have a look at rtl_fm
[16:20] <craag> yes
[16:20] <craag> rtl_fm is command line (mostly linux used) thing
[16:20] <ddg_> Just need to be able to detect the prescense of the different beacons
[16:20] <craag> more suited to rpi
[16:20] <craag> how are the beacons different?
[16:20] <craag> freq or code?
[16:21] <mattbrejza> well depending on how wide or strong these beacons are you could just do LNA -> SAW -> diode -> LPF -> threshold -> out
[16:23] <ddg_> beacons transmit at around 5mW (200m range in jungle environment with handheld receivers used currently)
[16:23] <ddg_> each beacon has a different frequency (10Hz increments)
[16:24] <mattbrejza> did you need to tell the difference betwen different beacons?
[16:24] <mattbrejza> either way, my idea is probably a bit too crude
[16:25] <ddg_> the fact that each beacon has a different freq, just knowing if the beacon is there or not (ideally some kind of heatmap with signal strength) is good enough
[16:25] <ddg_> and we know in advance which beacons to expect. Just not where they are.
[16:26] <mattbrejza> if the beacons sent small packets of data you could use a generic ISM reciever IC instead
[16:26] <ddg_> just a vhf pulse unfortunately
[16:26] <mattbrejza> if any of them expose RSSI and its fast enough you might be able to monitor that
[16:27] <ddg_> Not sure what RSSI is but they are really simple devices so doubt they do anything fancy but a vhf pulse
[16:28] <mattbrejza> i was referring to any small reciever ICs exposing rssi (signal strength)
[16:28] <ddg_> ok
[16:28] <ddg_> unfortunately I have to run and catch my train now.
[16:28] <ddg_> Thanks for the info, progress definitely. Will put braincells to work :)
[16:28] <mattbrejza> np :)
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[16:34] <daveake> recovered
[16:35] <daveake> several times actually :p
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[16:39] <mattbrejza> several times?
[16:39] <SpacenearUS> New vehicle on the map: 03KC9YMN - 12http://tracker.habhub.org/#!qm=All&q=KC9YMN
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[16:58] <daveake> "could you find it again for camera please"
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[17:09] Nick change: sumie-dh -> sumie_away
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[17:19] <SpacenearUS> New position from 03PYSY after 03a day silence - 12http://tracker.habhub.org/#!qm=All&q=PYSY
[17:19] <SpacenearUS> New vehicle on the map: 03PYSYchase - 12http://tracker.habhub.org/#!qm=All&q=PYSYchase
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[17:45] <SpacenearUS> New vehicle on the map: 03DC2EH-9 - 12http://tracker.habhub.org/#!qm=All&q=DC2EH-9
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[18:00] <colin1> Can anyone help with a problem getting a gps string through to DI fldigi. The string prints to serial okay, and bits of the string get through at the begining of each transmission, but what follows is gobledegook. I suspect some timing problems, but don't know enough about programming to be sure . Colin
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[18:17] <colin1> Hi Mark, I have been using straodene 3, managed to send the gps string to serial, produce rtty signal on SDR sharp, but when that translates to DI fldigi I only get a sensible result on the first few (six or so) letters - what follows is gobbledegook. Ant suggestions (I am using an Arduino and a radiometrix NTX2B-FA (434.300)Uno with)
[18:18] <Lunar_Lander> hello
[18:24] <Geoff-G8DHE_> colin1, can you do a screen grab of d-fldigi and sdr# whilst the data is coming in ?
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[18:49] <MarkIreland> Hi All
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[18:54] <colin1> Hi Geoff, I have the screen shot, How do I get it to you?? I am very new to freenode.
[18:54] <Geoff-G8DHE_> usually put it up on imgur.com or the like, then post a link here
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[19:02] <SpacenearUS> New vehicle on the map: 03KF6WBV_chase - 12http://tracker.habhub.org/#!qm=All&q=KF6WBV_chase
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[19:08] <DL7AD> hi
[19:09] <DL7AD> has anyone ever tried to receive DVB-S with a RTL-SDR stick on amateur radio bands?
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[19:23] <Lunar_Lander> guitar antenna
[19:23] <Lunar_Lander> https://drive.google.com/file/d/0B1lke6hPHKJDVWItZFVZQ3VZdUU/view?usp=sharing
[19:24] <colin1_> Geoff, the screenshot can be found at: http://imgur.com/uJ38FpF
[19:24] <DL7AD> Lunar_Lander: can you play songs with it? :D
[19:25] <Lunar_Lander> :D
[19:25] <Lunar_Lander> yea songs that fit on 434 MHz :P
[19:25] <Geoff-G8DHE> Ah yur missing the all important righthand side of dl-fldigi, that has the levels and other controls
[19:28] <DL7AD> Lunar_Lander: :D great
[19:28] <DL7AD> Lunar_Lander: for what did you make it? a new balloon?
[19:29] <Lunar_Lander> yea, the second flight that hopefully will happen soon :)
[19:35] <colin1_> Geoff, the screenshot can be found at: http://imgur.com/uJ38FpF
[19:35] <Geoff-G8DHE> Ah yur missing the all important righthand side of dl-fldigi, that has the levels and other controls
[19:36] <Geoff-G8DHE> It might be as simple as needing the Rv switch operated as I can see a repeating pattern
[19:37] <Geoff-G8DHE> the sdsr# side looks OK, so just the full window of dl-fldigi
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[19:38] <colin1_> Geaff! Yes!!!!!!!!!!!!
[19:38] <colin1_> I have a transmission!
[19:39] <Geoff-G8DHE> You have the tones reversed in that case.
[19:41] <colin1_> The string prints in full - though because I am indoors I do not have a GPS fix. Manythanks for your input. Is the reversed tones a problem?
[19:43] <Geoff-G8DHE> Other than causing confusion no ;-) Best to invert the waveform before it leave the processor, otherwise everyone tracking will have to think twice !
[19:44] <colin1_> How might I do this? is it a simple operation?
[19:44] <Geoff-G8DHE> What exactly is the setup you have ?
[19:45] <colin1_> Excuse this question, but what do you mean by 'setup'.?
[19:46] <Geoff-G8DHE> well what computer, transmitter are you running pwm or a simple resistive divider between them
[19:48] <SpacenearUS> New vehicle on the map: 03MOD2 - 12http://tracker.habhub.org/#!qm=All&q=MOD2
[19:50] <colin1_> Radiometrix NTX2B-FA 434.300 - but using divider resistors (4k7, 4k7, 47k). My radiopin is 9 (pwm, I think).
[19:52] <Geoff-G8DHE> OK sounds like you have the 1/0 outputed round the wrong way, you need to invert them in the software, as the tones are the wrong way around
[19:57] <colin1_> I have switched the digital leads. This produces a different DLflidigi waterfall lines - does that amount to the same thing?
[19:58] <Geoff-G8DHE> Umm, you only have one Tx lead so it can't be swopped around, which leads have you reversed ? Its the voltage levels that need changing not the physical leads ?
[19:59] <colin1_> the tx/rx leads
[20:00] <Geoff-G8DHE> that won't help, the Tx lead from the computer has the output on it, the other is the Input lead which won't be used as the tracker only sends data it doesn't receive data
[20:01] <Geoff-G8DHE> have you designed this yourself or are you using an existing design if so which one ?
[20:02] <colin1_> I will lookat the programme and come back to you, if I may. But thanks for your help - I have been stuck in this problem for weeks.
[20:02] <Geoff-G8DHE> OK nps there is normally someone around on the channel
[20:03] <colin1_> I have been using Mark's stratodene 3 with interrupts.
[20:05] <Geoff-G8DHE> OK well I think that uses a simple resistive divider to feed the transmitter, not sure if its hardware of software serial he uses, but if you have changed the code then the output needs inverting so that a 1 is sent when you currently send 0 and vice-a-versa
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[20:33] <SpacenearUS> New vehicle on the map: 03NERDTEST - 12http://tracker.habhub.org/#!qm=All&q=NERDTEST
[20:40] <SpacenearUS> New vehicle on the map: 03NERDPI - 12http://tracker.habhub.org/#!qm=All&q=NERDPI
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[22:37] <ntx2> howdy
[22:37] <ntx2> anyone has a general estimate of the ascent and descent rate to be expected on a HAB flight?
[22:39] <craag> ntx2: 5m/s ascent is an easy value to aim for
[22:40] <craag> 5m/s descent at sea level is also good :)
[22:40] <ntx2> thanks
[22:41] <ntx2> about 2 hours of upward flying to reach about 33-34 km
[22:41] <ntx2> i am trying to simulate the flight to see if the batteries will make it
[22:42] <ntx2> how long the descent should take? about the same time?
[22:43] <craag> descent will be quick at first as it'll freefall without atmosphere for the parachute to work on
[22:43] <craag> about 30 mins descent maybe?
[22:43] <craag> try: http://predict.habhub.org/
[22:45] <ntx2> thanks
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[00:00] --- Sat Aug 8 2015