highaltitude.log.20141207

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[00:21] <esculca> hi everyone
[00:22] <esculca> hey, has anybody been playing around with RF98H in FSK mode?
[00:22] <esculca> just to send RTTY?
[00:22] <esculca> any example?
[00:23] <esculca> I am srting the frequencies but it seems that I am not getting them in SDRSHarp
[00:23] <esculca> in Lora Mode I manage to send data across successfully
[00:24] <craag> matt got it to work, but by using it in (300bps?) FSK mode and sending 0000000011111111100000000011111111
[00:25] <craag> Doesn't switch frequency while in tx like the rfm22
[00:25] <esculca> really?
[00:25] <esculca> but what do you mean sending 0000000011111111100000000011111111?
[00:26] <esculca> you have to fill the buffers prior to TX=?
[00:26] <craag> so using the built-in FSK
[00:26] <craag> but then it doesn't go slow enough for 50 baud
[00:26] <esculca> noany example?
[00:26] <esculca> any example code?
[00:26] <esculca> oh I see
[00:26] <esculca> 300 bps
[00:26] <esculca> damm
[00:27] <esculca> i was hopint to get lora and rtty mode
[00:27] <esculca> and change them throughout the flight
[00:27] <craag> https://github.com/suspaceflight/lora-tracker/blob/master/liblora/radio.c
[00:27] <esculca> I guess many people thought about doing the same
[00:27] <craag> That lib does lora and rtty
[00:27] <esculca> ok, tks
[00:27] <esculca> I will have a look
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[00:39] <mattbrejza> or you can use the async input
[00:39] <mattbrejza> providing you connected it in advance of making your pcb...
[00:50] <Darkside> heh
[00:50] <Darkside> mattbrejza: rework wire!
[00:50] <mattbrejza> no need, software fixed ;)
[00:50] <Darkside> :P
[00:51] <Darkside> anyway, my code is slowly taking shape: https://github.com/darksidelemm/RFM98Arduino
[00:52] <mattbrejza> these things are pretty annoying though
[00:53] <mattbrejza> i tried to do uplink, so swtiching between tx and rx
[00:53] <mattbrejza> for some reason the uplink packet error rate is really bad
[00:53] <Lunar_Lander> good night!
[00:53] <mattbrejza> it sees the preamble but fails to see the header
[00:53] <mattbrejza> sigh
[00:53] <Darkside> bleh
[00:54] <mattbrejza> job for tomorrow
[00:54] <Darkside> if you figure it out let us know..
[00:54] <mattbrejza> and i have another module that seems damaged
[00:54] <Darkside> i'm sure we're all going to hit the same problem
[00:54] <mattbrejza> when nothing appears to be working, reading the stat register is insightful
[00:55] <Darkside> yeah, my code dumps that out
[00:55] <Darkside> every second
[00:55] <Darkside> so you see it detect a signal, get sync, find the header
[00:55] <Darkside> i want to make a nice little python gui with little'LEDs' showing the status
[00:55] <mattbrejza> yea, but the uplinked header is rarely found
[00:56] <Darkside> mmk
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[00:56] <mattbrejza> i have a 3rd module that hears the downlink and uplink, and that rarely decodes the uplink too
[00:57] <Darkside> well i'm one breakout from being able to test uplink
[00:58] <mattbrejza> hve you got it programming nicely now?
[00:58] <Darkside> no
[00:58] <Darkside> still screwed
[00:58] <Darkside> so im going to make another rework wire breakout
[00:58] <Darkside> plug it into a seeduino or something
[00:58] <Darkside> 3.3v
[00:58] <mattbrejza> at least one thing mine is doing is programming, but i really need another programmer
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[01:05] <mattbrejza> right, im off
[01:07] <Darkside> gnight
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[10:20] <paul_HABnoob> Hey every - been working on my first HAB project. Got a GPS / GSM tracker working and want to extend it out to UHF with the NTX2B on 434.075Mhz - Q: Where can I find the messaging schema used for RTTY location messages please? Thanks in advance...
[10:23] <Geoff-G8DHE-Lap> !wiki communications protocol
[10:23] <SpacenearUS> 03Geoff-G8DHE-Lap: No results for your query
[10:23] <Geoff-G8DHE-Lap> http://ukhas.org.uk/communication:protocol?s[]=ukhas&s[]=protocol
[10:24] <paul_HABnoob> Thats perfect - thank you!
[10:24] <mfa298> and ask on here when you get stuck.
[10:25] <Geoff-G8DHE-Lap> crc16_ccitt is best for checksum as well
[10:25] <paul_HABnoob> Thanks!
[10:26] <paul_HABnoob> oh that page is so cool. Thats saved me months of work.
[10:26] <mfa298> you may also find http://ukhas.org.uk/guides:linkingarduinotontx2 useful as a start to connecting an ntx2b radio module to something and sending basic rtty strings
[10:26] <Geoff-G8DHE-Lap> But still best to code it yourself rather than rely on what's been done before
[10:28] <paul_HABnoob> I'll be happy just to get it working!
[10:28] <paul_HABnoob> do people normally use 1/4 wave whips on HABs?
[10:29] <Geoff-G8DHE-Lap> Inverted ground planes are best
[10:29] <Geoff-G8DHE-Lap> 4 radials and a center whip
[10:29] <Geoff-G8DHE-Lap> keeps the radiation pattern lower
[10:30] <paul_HABnoob> Thats great thanks. I should have come on here months ago. could have saved acres of research.
[10:30] <paul_HABnoob> Currently running a UNO, FONA + Ultimate GPS Shield - it works ok so far...
[10:30] <Geoff-G8DHE-Lap> There's lots on the wiki its the normal problem of finding it but just aask away on here if its not obvious
[10:31] <mfa298> There's a guide on the wiki for building a payload antenna
[10:31] <paul_HABnoob> Awesome!
[10:32] <Geoff-G8DHE-Lap> !wiki payload antenna
[10:32] <SpacenearUS> 03Geoff-G8DHE-Lap: No results for your query
[10:32] <Geoff-G8DHE-Lap> duh
[10:32] <mfa298> you might want to check what chipset the GPS Shield uses, A lot don't work above 18km (Ublox is the tried an tested GPS and can be configured for up to 50km)
[10:32] <Geoff-G8DHE-Lap> !wiki payload aerial
[10:32] <SpacenearUS> 03Geoff-G8DHE-Lap: No results for your query
[10:32] <paul_HABnoob> just read it :)
[10:32] <mfa298> http://ukhas.org.uk/guides:payloadantenna
[10:32] <paul_HABnoob> Checked it out and it said tested to 40KM
[10:33] <paul_HABnoob> in its wiki...
[10:34] <paul_HABnoob> https://learn.adafruit.com/adafruit-ultimate-gps-logger-shield/faq
[10:34] <mfa298> If that's the Adafruit one it might work but I don't think anyone here has actually tested on (apart from a very early version which got lost)
[10:34] <paul_HABnoob> Looks like I'll be a guinea pig then :)
[10:35] <paul_HABnoob> but before I can do anymore I have to wait for a dab USB stick to turn up :-/
[10:37] <paul_HABnoob> Thanks for help so far - I'll save this message thread and readup.
[10:37] <Geoff-G8DHE-Lap> There is always the logs as well http://habhub.org/zeusbot/
[10:37] <mfa298> depending on where you are and what your flying you may be able to borrow a backup tracker from someone or piggyback on another launch which removes some risk from trying a new thing
[10:38] <paul_HABnoob> Both great ideas!
[10:39] <Upu> paul_HABnoob check the firmware
[10:39] <Upu> it *may* be 40km
[10:39] <Upu> it *may* be 27km
[10:40] <Upu> if its 27km on you're going to have an annoying day
[10:40] <paul_HABnoob> good point
[10:41] <Upu> or just get one of the ublox from my shop job jobbed :)
[10:41] <Upu> I tested their prototype and it worked to at least 38km
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[10:42] <Upu> what radio are you using ?
[10:42] <paul_HABnoob> I was planning to use an NTX2B
[10:42] <Upu> ok certainly get that from my shop as it will be cheaper and frequency agile
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[10:43] <paul_HABnoob> your shop?
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[10:44] <Upu> http://ava.upuaut.net/store
[10:44] <Lunar_Lander> hello
[10:44] <Upu> sent you a PM too
[10:57] <mclane_> paul_HABnoob: and go away from 434.075MHz - with upu's NTX2B-FA you can tune to a frequency which is less disturbed by ISM devices
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[11:18] <paul_HABnoob> thanks mclane
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[12:24] <Ian_> Not read it yet, but http://stakeholders.ofcom.org.uk/binaries/consultations/420-470-mhz/summary/420-470-mhz.pdf
[12:24] <Ian_> Might be worth a look
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[13:57] Action: SpacenearUS is going for a nap.
[13:57] Action: SpacenearUS is back!
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[20:54] <amell> got a pi cam in the mail today, suspicious - can anyone tell me if they think this is a chinese knock off of the real thing? http://i.imgur.com/Gt7VwHN.png http://i.imgur.com/mqbVEsg.png?1
[20:55] <amell> not had one before so cant tell...
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[20:57] <adamgreig> https://www.google.com/search?q=raspberry+pi+camera&tbm=isch
[20:58] <daveake> I'm suspicious that you got mail on a Sunday :p
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[20:59] <amell> came yesterday. hard to tell if these are real or not.
[20:59] <amell> im primarily concerned that substandard parts have been used.
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[21:00] <edmoore> it has the tell-tale serif fonts
[21:00] <edmoore> so beloved of asian pirates
[21:00] <daveake> And that dodgy red tag on the lens cover
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[21:02] <amell> i bought this: http://www.ebay.co.uk/itm/291180948837
[21:02] <mfa298> all the pi cam's i've had have a green (ish) tag on the lense not red
[21:02] <fsphil> the label on the cmos connector is different too
[21:02] <fsphil> and no vias on your chinese one
[21:02] <adamgreig> also the resistors on the south
[21:03] <amell> wonder if the real camera uses Omnivision 5647 and BCM2835 because thats what the seller claims in the ebay listing
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[21:04] <mfa298> bcm2835 sounds like the Processor for the Pi not something on the camera board
[21:04] <daveake> er, the 2835 is the pi SOC
[21:05] <mfa298> and as I recall pretty much only one camera module will work as there's not support for any others in the binary blob for the gpu
[21:05] <amell> yeah. Custom designed and manufactured by the Raspberry Pi Foundation in the UK, the Raspberry Pi Camera Board features a 5MP (2592×1944 pixels) Omnivision 5647 sensor in a fixed focus module. The module attaches to Raspberry Pi, by way of a 15 Pin Ribbon Cable, to the dedicated 15-pin MIPI Camera Serial Interface (CSI), which was designed especially for interfacing to cameras. The CSI bus is capable of extremely high data rates, and it exclusivel
[21:05] <amell> carries pixel data to the BCM2835 processor.
[21:05] <amell> Does that claim its manufactured by pi foundation...
[21:05] <Upu> why didn't you just buy from an authorised distributor ?
[21:05] <amell> debating whether to make an issue of it with the seller
[21:06] <Upu> £25 from Pimorini
[21:06] <amell> upu: the way the ebay item description reads i thought it was genuine
[21:06] Action: Upu shrugs
[21:06] <Upu> price would indicate otherwise
[21:07] <fsphil> ebay would indicate otherwise :)
[21:07] <fsphil> but hey if it works then don't worry about it
[21:08] <daveake> Always worth checking history ... http://feedback.ebay.co.uk/ws/eBayISAPI.dll?ViewFeedback2&userid=lightintheshop&myworld=true&items=25&iid=-1&de=off&which=negative&interval=365
[21:08] <fsphil> you could do a comparason against a foundation version
[21:08] <amell> yeah, i will try it out.
[21:12] <Maxell> Upu: intresting check out the second photo http://www.wired.com/2013/02/raspberry-pi-camera-module/
[21:14] <amell> there seems to have been a number of versions and manufacturers
[21:14] <daveake> At one point (before release) I was offered the 14MP camera to test
[21:14] <daveake> I pointed out that they might not get it back
[21:14] <daveake> It was the only one they had
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[21:19] <Maxell> daveake: they did not dare? ;)
[21:19] <daveake> They did I didn't
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[21:25] <fsphil> to be fair, a 14MP camera with that little lens wouldn't make much sense
[21:26] <fsphil> unless it had better optics than the one finally released?
[21:26] <edmoore> yeah - there's a understand-of-nyquist fail when people do that
[21:26] <edmoore> understanding*
[21:27] <edmoore> hey guys, i've low-pass filtered this audio to 2khz but i'm going to sample it with this amazing 96khz sound card so it'll sound great!
[21:28] <fsphil> I remember discussing with someone how re-encoding their 64kbit/s mp3 to 160kbit/s wasn't really improving it...
[21:28] <fsphil> they where convinced it sounded better
[21:28] <edmoore> lol
[21:28] <Maxell> fsphil: do people still derp that?
[21:28] <edmoore> no helping audiophiles
[21:28] <fsphil> Maxell: not recently, this was a good few years ago
[21:28] <Maxell> ah
[21:29] <Reb-SM0ULC> evening!
[21:29] <fsphil> but it didn't quite sink in for them, in the same way the megapixel thing isn't now
[21:29] <fsphil> "but it's a bigger number, it MUST be BETTER!"
[21:30] <mattbrejza> also, this screen is HD, it must be better
[21:30] <mattbrejza> reason laptop resolutions have lowered
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[21:44] Action: SpeedEvil stbas.
[21:46] <Maxell> Balls on escalator https://www.youtube.com/watch?v=c5P-c7rc4bA
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[21:55] <fsphil> with a description like that, not sure I should click :)
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[21:56] <qyx_> safe :P
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[21:59] <fsphil> ooch
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[22:08] <SpeedEvil> Laurenceb_: unrecognised hazards to balloons https://www.youtube.com/watch?feature=player_detailpage&v=ugOpM3FgC5o#t=344
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[22:18] <SpacenearUS> New vehicle on the map: 03rohit_chase - 12http://habhub.org/mt/?focus=rohit_chase
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[22:48] <Babs_> Evening - I have an atmega 328, an LED, 2 i2c temperature sensors, an SD card reader and a ublox m8 running off it. At the risk of someone writing "just read the datasheets" this shouldn't kill it in terms of too much current being drawn should it?
[22:48] <adamgreig> kinda depends on your current source
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[22:48] <adamgreig> bit much for a potato
[22:48] <adamgreig> probably fine for an energizer lithium primary cell
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[22:49] <daveake> not many currants in a potato
[22:49] <Babs_> its just that unless i place the power leads for the m8 close to the voltage regular so it gets first dibs on the juice, the voltage that is being passed to it has dropped to c.3v and won't power it
[22:49] <Babs_> i have 4 duracells
[22:50] <adamgreig> that's weird
[22:50] <chrisstubbs> Babs_ is this breadboarded?
[22:50] <Babs_> yes chrisstubbs
[22:50] <Babs_> does the copper heat up?
[22:51] <chrisstubbs> check you dont have a load of cheap chinese jumpers chained up giving you a high resistance
[22:52] <chrisstubbs> what is the voltage at the ublox?
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[22:52] <Babs_> about 3.9
[22:53] <adamgreig> 3.9V from four cells?
[22:53] <Babs_> altough that is 3.9 going into one of upus breakout boards
[22:53] <adamgreig> maybe you should get new batteries :P
[22:54] <chrisstubbs> As I understand thats 3.9v from a 5v regulator right? Going into the 5v breakout board with the level converters
[22:55] <Babs_> surprisingly good photo of it just taken
[22:56] <Babs_> https://www.flickr.com/photos/91049302@N00/15945067276/
[22:56] <fsphil> the resistance between the gps vcc pin and the output pin on the vreg must be pretty high
[22:56] <adamgreig> what's the voltage out of the battery pack? or the voltage regulator?
[22:56] <Upu> hmm ?
[22:56] <Upu> those have 3.3V regulators onboard
[22:56] <fsphil> * the board's vcc pin
[22:58] <Babs_> 5.57 into the voltage regulator
[22:58] <Babs_> 4 ish out
[22:58] <chrisstubbs> is it a 7805 regulator?
[22:59] <fsphil> you need more volts going in :)
[22:59] <Upu> lm1117
[23:00] <Babs_> chrisstubbs - got 7805 written on it
[23:00] <chrisstubbs> you need at least 2v more going in than the output voltage ideally
[23:00] <chrisstubbs> unless you use a low dropout regulator
[23:00] <Babs_> thanks fsphil...
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[23:01] <mattbrejza> i once found a 7805 worked better with vin and vout switched
[23:01] <mattbrejza> in reverse you get about 1V drop which was what was needed
[23:01] <mattbrejza> in forward it was 2V which was too much
[23:01] <Babs_> ok, but with a 9V battery it is even worse
[23:01] <fsphil> really?
[23:02] <fsphil> didn't expect that
[23:02] <chrisstubbs> 9v batteries dont supply a whole lot of current
[23:02] <chrisstubbs> also, is the regulator getting hot?
[23:02] <Babs_> nope
[23:02] <chrisstubbs> good :)
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[23:04] <fsphil> try measuring the voltage going in when using the 9V
[23:04] <Babs_> nteresting - the mattbrejza workaround worked
[23:05] <fsphil> it may be dropping quite a bit
[23:05] <Babs_> is there any way of determining what is vin and vout on the regulator
[23:06] <Babs_> EDIT: have i just been using it the wrong way around?
[23:06] <chrisstubbs> https://www.fairchildsemi.com/datasheets/LM/LM7805.pdf
[23:06] <chrisstubbs> image on page 1
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[23:06] <mattbrejza> Babs_: i wouldbt suggest you actually do that, it doesnt regulate in reverse
[23:10] <Babs_> was using it the right way around
[23:10] <Babs_> it just doesn'twork the right away around
[23:10] <Babs_> or doesn't work as well
[23:10] <fsphil> it is, the voltage just isn't high enough for it to regulate
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[23:11] <mattbrejza> can you poewr it off the ftdi?
[23:11] <mattbrejza> assuming 3.3v ftdi
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[23:11] <fsphil> do you have capacitors on the input and output of the 7805?
[23:11] <fsphil> I've seen regulators do very odd things without capacitors
[23:12] <Babs_> matbrejza, yes. i'm trying it in "field mode"
[23:12] <Babs_> yes fsphil
[23:12] <Babs_> is that right?
[23:13] <Babs_> they are one way capacitors, with +ve on the positive pin of the vin, an +ve on the positive pin of the vout, with common ground
[23:13] <fsphil> perfect
[23:13] <fsphil> just bad vcc in maybe
[23:13] <chrisstubbs> Babs_, do you have anything >7v to power it off?
[23:14] <chrisstubbs> RC lipos or anything
[23:14] <Babs_> only the 9v battery christstubbs
[23:14] <fsphil> try measuring the voltage out of that battery while it's connected
[23:14] <Babs_> sorry, chrisstubbs - didnt mean to deityify you
[23:15] <fsphil> lol
[23:15] <Babs_> i've got some rc lipos yes actually
[23:15] <Babs_> can try one of those
[23:15] <chrisstubbs> one thing to note: the more volts you put in the more heat the regulator will produce
[23:15] <chrisstubbs> it has thermal protection but just bear that in mind to avoid head scratching
[23:16] <Babs_> as in put through 11.6V, if it gets hot but outputs 5v, then i know I have to just give it more oomph
[23:16] <Babs_> ?
[23:16] <Babs_> oomph = volts
[23:17] <fsphil> yes
[23:17] <chrisstubbs> yeah try that
[23:19] <Babs_> cool. will do. thanks. in the meantime, bearing maths. https://www.flickr.com/photos/91049302@N00/15970973475/
[23:19] <Babs_> if the GPS is getting a little lower than ideal voltage, will i struggle to find lock as easily?
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[23:20] <Babs_> (i' getting valid checkdigits), it just seems to take longer locking under battery power than through ftdi
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[23:21] <Lunar_Lander> good night
[23:21] <Babs_> where i live has little clear view of the sky, so locking is never easy, it just feels longer typically under battery power
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[23:29] <chrisstubbs> Babs_, possible that or noise will affect it
[23:30] <Babs_> noise?
[23:32] <chrisstubbs> the 7805 will produce some ripple/noise on its output
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[23:33] <chrisstubbs> I expect upu's board has filtering caps anyway on its own regulator
[23:34] Action: chrisstubbs looks at the photo - yes it does
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[23:35] <Babs_> ok thanks all - really great help - off to bed now
[23:35] <chrisstubbs> good luck, laters!
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[00:00] --- Mon Dec 8 2014