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[02:17] <Laurenceb_> http://i.imgur.com/XZURkKb.png
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[03:25] <SpacenearUS> New position from 03DL7AD-12 after 038 hours silence - 12http://tracker.habhub.org/#!qm=All&q=DL7AD-12
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[04:18] <lburton> manterolat: we recovered it :) a few hours back ... might have video issues but we have telemetry .. was reasonably easy to find, it was beaconing on ground and we drove to last and got an exact fix
[04:19] <lz1dev> good to hear
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[04:34] Nick change: daey_ -> daey
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[04:38] <DL7AD1> good morning
[04:38] Nick change: DL7AD1 -> DL7AD
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[05:52] <DL7AD> fsphil: there's a huge mess on the map
[05:53] <edmoore> DL7AD: this is what happens if you lock fsphil in at night
[05:53] <edmoore> you must remember to let him out
[05:53] <DL7AD> hm?
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[08:24] Nick change: SA6BSS-Mike|2 -> SA6BSS-Mike
[08:25] <PE2BZ> GM all. Happy Easter !
[08:25] <PE2BZ> !flights
[08:25] <SpacenearUS> 03PE2BZ: Current flights: 03Pecan SSDV Tracker 10(e3a9)
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[08:35] <SpacenearUS> New vehicle on the map: 03160000.0302.002_chase - 12http://tracker.habhub.org/#!qm=All&q=160000.0302.002_chase
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[10:04] <jakeio> Hello, I was just wondering, when ordering from Uputronics, it states to specify the frequency of the NTX2B, should I do this on the checkout page where it asks for you to "Add Comments About Your Order"? Happy Easter by the way!
[10:07] <SpacenearUS> New position from 03Legionowo after 039 hours silence - 12http://tracker.habhub.org/#!qm=All&q=Legionowo
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[10:09] <Upu> hey jakeio
[10:09] <Upu> morning
[10:09] <Upu> We'll supply a random one (you can change it) or you can specify what you want on the comments part of the check out cheers
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[10:51] <SpacenearUS> New vehicle on the map: 03chase - 12http://tracker.habhub.org/#!qm=All&q=chase
[10:52] <fsphil> DL7AD: how'd you manage that? :) no contact for a while :/
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[11:20] <craag> Nice pics from DL7AD
[11:20] <craag> (yesterday)
[11:20] <craag> Is that an ov2640?
[11:20] <fsphil> ov9655
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[11:22] <fsphil> I believe they're trying the 2640 next
[11:22] <craag> ah ok and then sw jpeg encode?
[11:22] <fsphil> yeah
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[11:22] <craag> I've got an ov2640+stm on the desk from another project - would be good to try that up
[11:23] <fsphil> I've got one ordered, from china so who knows where it is
[11:23] <fsphil> they seem to have a much higher image quality
[11:24] <craag> yes the encoder on them is really good, mozjpeg barely makes a scratch at improving it.
[11:24] <fsphil> ah good, that was the bit I was wondering about
[11:24] <craag> their low-lihgt performance is terrible which made it useless for what I wanted it for though.
[11:24] <craag> tis an old module though
[11:24] <fsphil> the 9655 is quite bad even in a brightly lit room
[11:25] <SpeedEvil> I wish that some of the USB devices specced the chip they had driving
[11:25] <SpeedEvil> http://www.aliexpress.com/item/Max-Resolution-8MP-3264X2448-SONY-IMX179-CMOS-12mm-lens-MJPEG-YUY2-Mini-CCTV-USB-board-Android/32589036460.html - say
[11:26] <SpeedEvil> you can get docs on the IMX part
[11:26] <SpeedEvil> but not the driver - to see if you can do long exposure say
[11:29] <DL7AD> fsphil: how did i manage what?
[11:29] <fsphil> the map glitch
[11:29] <DL7AD> craag: please help me.... i'm already struggling for weeks to get the OV2640 to work :P
[11:30] <DL7AD> fsphil: no idea
[11:30] <DL7AD> .hysplit DL7AD-12
[11:30] <SpacenearUS> 03DL7AD: HYSPLIT for 03DL7AD-12 - 12http://spacenear.us/tracker/hysplit_cache/160327-10_18381_DL7AD12.gif
[11:34] <DL7AD> i hope the balloon will arrive in israel today before sunset
[11:37] <DL7AD> i'm surprised. the balloon did not reset at night. the sequence id did not start again at 1.
[11:38] <DL7AD> so it was running all the time without GPS and transmissions.
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[11:39] <DL7AD> found this: https://www.facebook.com/amsatuk/photos/a.555434137832973.1073741826.208113275898396/1031505863559129/?type=3&theater
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[12:07] <SpacenearUS> New vehicle on the map: 03RN6HI - 12http://tracker.habhub.org/#!qm=All&q=RN6HI
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[12:28] <SpacenearUS> New position from 03SP6NVB-11 after 0311 hours silence - 12http://tracker.habhub.org/#!qm=All&q=SP6NVB-11
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[13:33] <pb0ahx> !flights
[13:33] <SpacenearUS> 03pb0ahx: Current flights: 03Pecan SSDV Tracker 10(e3a9)
[13:35] <pb0ahx> !dial SP6NVB-11
[13:35] <SpacenearUS> 03pb0ahx: Can't find a flight doc matching your query
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[14:13] <SpacenearUS> New vehicle on the map: 03SP9UOB - 12http://tracker.habhub.org/#!qm=All&q=SP9UOB
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[14:52] Nick change: Steffanx -> Steffann
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[15:02] <SpacenearUS> New vehicle on the map: 03ORCA - 12http://tracker.habhub.org/#!qm=All&q=ORCA
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[16:04] <daey> does anyone know a tool that makes it easier to figure out an unknown protocol? basically map different bitlength/stopbits/paritybits over a given bit string? e.g. "11110101111100110101100110111011100110110111"
[16:05] <Ian_> It's called a UART :)
[16:06] <daey> thats just the general name for the protocol
[16:06] <daey> it still leaves open a lot of variables
[16:08] <daey> in a logic analyzer program i could simply analyze the bits by putting a mask over it, and the program would highlight errors. but as i dont have the data in such a program i dont have that luxury
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[16:14] <Ian_> If it's asynchronous, then it's going to have a start bit and probably one or two stops bits. Likely to be seven or eight bit data.
[16:15] <Ian_> If it's baudot, then the stop bits are likely to be one start bit, five data bits and 1.5 units long
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[16:16] <daey> Ian_: yeah that was my thought as well. i logged a few transmissions. everyone had 44bits. but the last transmitted bit also changes, so i assume its some proprietary protocol that doesnt even use stop bits :/
[16:17] <BrainDamage> pulseview has decoding error highlights
[16:17] <Ian_> If it's synchronous then It may have a frame structure. I guess that you will be looking for repeating patterns that will give the game away.
[16:18] <Ian_> What sort of telegraph speed are we talking and what sort of RF frequency is the signal to be found upon?
[16:18] <daey> Ian_: well the basic data structure looks obvious. the end heavily changes and therefore likely is some form of CRC. the beginning is likely a unique id as it doesnt change at all
[16:18] <daey> Ian_: its 433Mhz and most likely a temp/ maybe humidity transmitter
[16:18] <daey> and ook
[16:19] <Ian_> Ah well at least it isn't likely to be a military encrypted transmission then.
[16:19] <daey> ;D
[16:20] <russss> I don't think those things tend to have start/stop bits
[16:21] <Ian_> What, military?
[16:21] <russss> no, random sensor things
[16:21] <Ian_> Right, just packed binary packets
[16:21] <russss> daey: you may find this helpful https://github.com/merbanan/rtl_433
[16:22] <daey> russss: already looked through it :>
[16:22] <russss> aha well I have no additional advice then
[16:23] <Ian_> DF it and then knock the door and ask :)
[16:23] <russss> I would tend to go at this kind of thing via gnu radio but that is my preference. Ultimately you will end up trying to decode the bits by eye though
[16:23] <russss> it's much more difficult when you can't control the transmitter
[16:24] <daey> i exported the wave files via gqrx then looked at them in audacity
[16:24] <daey> y if i could modify it i would simply heat it up or freeze it down
[16:24] <russss> my One Weird Tip which I learned from some germans who are better at this than me: replace the 0s with underscores, it's easier to see the differences by eye.
[16:25] <jakeio> Has anyone got any experience using: https://store.uputronics.com/index.php?route=product/product&path=60_64&product_id=83
[16:25] <Ian_> Yes, I guess that if it's largely temp and humidity the readings would stay much the same, with a bit of bobble but as the evening came on the trend would change.
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[16:28] <daey> the thing that amazes me is how often these transmitter seem to transmit. im receiving multiple of them and some update in 30s intervalls
[16:29] <Ian_> Nice device jakeio, what's the question?
[16:29] <jakeio> Really, just if there's anything untoward that I should know about!
[16:30] <Ian_> No, the Sarantelle antenna is much better than the chip antennas
[16:30] <jakeio> Thanks!
[16:30] <Ian_> I have the 5V version as I intend to use it with an Atmega328p
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[16:38] <jakeio> Ian_: Ah, I'm using it with a Raspberry Pi Zero so the 3.3V version is for me!
[16:40] <jakeio> Ah, I have a really odd question, can anyone recommend any particular soldering iron? If not, I'll just go for a good value Screwfix one!
[16:40] <russss> depends on your budget
[16:40] <Ian_> I use an Antex X25 and have done for many years, but there are a lot of good modern irons out there
[16:41] <jakeio> Well, I'd prefer not to get anything particularly expensive. I just need something that'll do the job!
[16:41] <Ian_> that people speak very highly of. Avoid the 1/4 inch copper rod bit type of yesteryear though.
[16:42] <gonzo_nb> you could do worse than a basic weller for a budget iron
[16:43] <Ian_> Why Antex, well the bits are available and interchangeable.
[16:43] <gonzo_nb> all the bits are avain, lots of top options and temp ranges
[16:43] <russss> yeah. Antex or Weller is probably the best in the <£50 price range
[16:43] <Ian_> +1
[16:43] <gonzo_nb> top=tip
[16:43] <adamgreig> weller>antex ime
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[16:43] <adamgreig> not much in it though
[16:43] <gonzo_nb> all my wellers are chuck outs from work
[16:43] <adamgreig> there are a few more modern or less famous brands that probably have good things at the same price point. tenma probably.
[16:44] <gonzo_nb> mostly just scruffy or failed mag temp switches (replaced off ebay)
[16:45] <russss> I am slightly tempted by this thing. http://www.banggood.com/TS100-Digital-OLED-Programable-Interface-DC-5525-Soldering-Iron-Station-Built-in-STM32-Chip-p-984214.html
[16:46] <gonzo_nb> my main iron is a 25yr old magnalock weller. Thing they went out of production years ago. Like the magnastst, but with a Pt temp probe up the tip and some eletronics to control it
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[16:46] <gonzo_nb> you plug in little inderts to set the temp range
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[16:47] <gonzo_nb> the weller magnastats have a magnet in the tip, that loses it's magnetism at a certain temp, and pulls a mag switch in the handle
[16:47] <Ian_> I used a Weller with a temp controlled magnetic bit years ago. Plated bit that eventually got dressed when the plating pinholed and lost copper from underneath the plating.
[16:47] <Ian_> I was on a small island at the time however, in the Indian Ocean
[16:48] <Ian_> Curie point set the temperature
[16:48] <gonzo_nb> those type you can quickly change the bits, so different shape or temp range
[16:48] <Ian_> Just a drop in as I recollect
[16:49] <gonzo_nb> most of the works ones were chucked iut when they had to go lead free. Even though it is only the tip that needed changing
[16:49] <gonzo_nb> but as I harvested them all I didn't complain
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[16:50] <gonzo_nb> got some for me and a load for tnhhe radio clubb
[16:50] <Ian_> My experience with BangGood is that they tend to deliver on the long side of the delivery window, but the goods always turn up.
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[16:50] <miek> russss: it's good
[16:51] <russss> yeah, I've heard reasonable things about it
[16:51] <gonzo_nb> a good 50W temp controled iron is very usable. Quick to pump heat into a joint. Non temp are just a waste of time
[16:51] <russss> I don't have much workspace at home so I'm keen on something fairly small.
[16:51] <arjunnaha> Are there any Weller/Antex soldering stations within the £50> price?
[16:52] <gonzo_nb> the weller basic stations, the base is just a 24vac transformer. So a cheap ebay used one should be fine
[16:53] <gonzo_nb> elements and the mag switches do go, but are replaceable
[16:53] <miek> russss: i've paired it with a 4S lipo for mobile use, but i end up using it at home instead of my weller cause it works really well
[16:53] <russss> miek: good to know. I have a chunky lithium battery pack with a 19V output which would work too. So I may go for one.
[16:54] <gonzo_nb> I did buy a cheepo, £20? temp controled station from maplin. was not that bad. The most annoying was that the cable wasn't as flexible as the silicon ones that the wellers have. So was a little clumsy to use
[16:55] <gonzo_nb> still lives in the garage in case I can't be arsed getting one form the workshop
[16:56] <russss> if you're buying a station then you can get a Hakko for <£100
[16:56] <miek> daey: if you upload a baseband recording you might nerdsnipe a few people :)
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[17:02] <AdiOltean> Hi all, thanks all again yesterday for the habhub trascker integration! Recovery was a success! habhub rules.
[17:02] <AdiOltean> This was for KG7WFR-11
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[17:03] <jakeio> Ian_ do you think this will suffice? http://www.maplin.co.uk/p/antex-12w-mains-soldering-iron-yu90x
[17:05] <daveake> 12W? Waste of money.
[17:05] <daveake> If you can stretch to something with more power and temperature controlled, it'll be much more useful
[17:06] <russss> yeah 12W is not great
[17:07] <mfa298> I'm pretty sure cpc have a 50W adjustable temp soldering iron for about £5 (probably ex VAT)
[17:09] <jakeio> mfa298: I'm just looking for this!
[17:10] <russss> they have some cheap Tenma ones
[17:10] <jakeio> mfa298: Is this the one you meant? http://cpc.farnell.com/duratool/d00803/soldering-iron-50w-variable-temp/dp/SD01674
[17:11] <russss> that's probably better than the 12W antex
[17:13] <mfa298> jakeio: this is the oen I was thinkging of, http://cpc.farnell.com/duratool/d02265/soldering-station-48w/dp/SD01867
[17:14] <adamgreig> I'd much rather a good 12W than a crappy 50W
[17:14] <adamgreig> but in this case both are probably crappy so.. :P
[17:15] <russss> oh yeah that one mfa298 posted is a bit of a classic
[17:15] <mfa298> for cheep and cheerful that one is ok (I got a similar one from maplin)
[17:15] <jakeio> mfa298: Thanks. Would you recommend this for an entry level soldering iron? I mean, I'll only be using this for very very few things, mainly just the linking of the radio and GPS to my pi zero.
[17:16] <mfa298> but these days I'd spend a bit more for somethign better
[17:18] <jakeio> mfa298: thanks!
[17:18] <mfa298> jakeio: it really depends on how much you want to spend, I've got one thats similar that does ok for through hole stuff, but there are much better ones if you can afford a bit more.
[17:19] <jakeio> mfa298: well, I'd rather not spend any more as it's only going to be used for some very simple bits and bobs.
[17:21] <mfa298> the one you found is potentially as good, although you'd want to get a stand and something to clean the tip (often a wet sponge on cheaper setups)
[17:22] <jakeio> mfa298: well, as the one you recommended has a stand and a sponge already, I shall stick with that. In the past I've never used one with variable temperature, always just had a simplistic pencil one!
[17:23] <mfa298> I decent temperature controlled iron lets you set the temperature to something known, those ones just let you go hotter or colder
[17:24] <jakeio> Ah, so unless I've got a thermometer around I'll be as clueless as if I were using a non-temp controlled one...
[17:25] <mfa298> you won't know what temperature it is, but you can at least have some adjustment which is a step up from no control
[17:25] <Ian_> A good start is http://www.my-tool-shed.co.uk/p1093022/Antex_Xs25-230v_25w_Solder_Iron__Plug_S582470/product_info.html?utm_source=googleversafeed&vfsku=1093022&gpla=pla&gclid=Cj0KEQjwid63BRCswIGqyOubtrUBEiQAvTol0WD6P5NB9QXbbVLwDqqJjM7wefu8BDv-5psDNebMI9waAtU98P8HAQ
[17:26] <jakeio> Ian_ this one isn't temperature controlled though?
[17:26] <Ian_> At a later date you can go temperature controlled but the XS25 is a good basic model with a range of bits universally available.
[17:26] <Ian_> No it's quite basic. What do you know at this point in time about soldering temperatures?
[17:28] <Ian_> I rest my case - for now. With experience you will want a more refined iron, but unlike the ones that you linked earlier, this has a wrap around bit and not a 1/4 inch copper rod that I mentioned earlier
[17:29] <jakeio> Thanks!
[17:30] <Ian_> I might get a temperature controlled iron . . . one day. My X25 I have had for 30 years
[17:32] <jakeio> daveake: I've been reading about using the raspberry pi as a microcontroller for a HAB, and I've frequently referenced your article on the UKHAS website, at one point you mention setting a voltage offset with a bias resistor, and a frequency gap with a series resistor. I've got a query regarding this, what is the frequency gap, and why is it necessary? Additionally, what resistance should the resistors be? Thanks!
[17:34] <daveake> !wiki ntx2+arduino
[17:34] <SpacenearUS> 03daveake: No results for your query
[17:35] <daveake> That should cover it
[17:36] <Ian_> That covered the pwm method and not the bias resistors dave
[17:36] <daveake> grrr
[17:37] <daveake> OK, the NTX2 is an FM transmitter, the frequency of which is controlled by a voltage input
[17:37] <daveake> If you drive that directly from an output pin on a Pi or whatever, form 0 to 3.3V, the output frequency will change by several kHz
[17:39] <daveake> We need the change to be a few hundred Hz only, a) so it's within the audio passband of typical radio receivers, and b) within the range listened to by dl-fldigi (4kHz max)
[17:39] <daveake> So we want to divide that 3.3V range down to a fraction of a volt
[17:39] <daveake> hence the resistor
[17:39] <jakeio> OK, thanks.
[17:41] <daveake> pwm is a mistake for that tutorial
[17:43] <jakeio> And the bias resistor just ensures the voltage is positive rather than being between -V and +V? Or has stackexchange failed me!?
[17:44] <jakeio> By shifting the voltage up or down?
[17:45] <SpeedEvil> http://www.spaceflight.com/schedule-pricing/ okaaaaay
[17:45] <SpeedEvil> ah - nvm
[17:46] <daveake> It can't go -ve anyway it can only be set somewhere between 0V and 3.3V
[17:47] <daveake> Bias is probably pointless but everyone does it
[17:48] <daey> is it common that the long signals are '0' and the short ones are '1'? http://imgur.com/QD19DvN
[17:51] <Ian_> daey, I think that the run in and run out will be the mark tone, usually the higher frequency tone.
[17:51] <jakeio> OK, I'll do some Maths now and work out what voltage I should be using... Am I right in saying the NTX2 will change by about 2kHz per V?
[17:53] <Ian_> At logic levels, mark is low and the spacing condition is high. The first space (high) excurtion is the start pulse, 7 or 8 data bits and then 1 or 2 stop bits - per character.
[17:54] <Ian_> Not sure jakeio, but seem to think that when the bit of circuitry with the bias resistors was around 4k7 and 47k were the resistor values.
[17:54] <jakeio> Thanks Ian_
[17:56] <Ian_> 4k7 + 4k7 Vcc to Gnd and 47k from the Arduino data pin. All joined at the centre and off to the NTX2B data pin.
[17:56] <Ian_> Obviously changing the value of the 47k will adjust the frequency shift.
[17:56] <Ian_> I'll endeavour to find that old diagram somewhere.
[17:56] <daveake> See the datasheet - that will tell you the min/max deviation per V
[17:57] <jakeio> Thanks again!
[17:57] <Ian_> If in any doubt, daveake trumps my knowledge by more than a few magnitudes
[17:58] <jakeio> Haha!
[18:04] <Ian_> https://alienproject.wordpress.com/tag/ntx2/ Different values, but this gives the sense of things.
[18:12] <Ian_> http://blog.jgc.org/2011/01/voltage-divider-calculator-for.html use the configuration link for more info.
[18:12] <jakeio> Thanks!
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[18:18] <Ian_> Seems like some adjustment is likely to be required, but you have a starting point.
[18:18] <miek> daey: yeah, that's pretty common. usually referred to as PWM encoding (on top of OOK)
[18:19] <Ian_> The PWM technique was to save messing with extra components, but then the pin and clocks that got tied up became more of an issue.
[18:20] <Ian_> The PWM merely produces an apparent voltage of the right magnitude.
[18:20] <fsphil> daey: what's that from?
[18:21] <Ian_> I read around phrases that I don't understand fsphil . . .
[18:22] <Ian_> The NTX2B is essentially not OOK as it's always on during the transmission and the information is imparted by shifting it's frequency - fsk
[18:23] <miek> Ian_: i think we've got two conversations crossing over a bit, daey is talking about reverse engineering an unknown signal
[18:24] <fsphil> ah, unknown. fun :)
[18:24] <Ian_> Ah, sorry about that. yes, I'm all crossed wires. I'm done now all resistored out.
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[18:27] <fsphil> my wireless mains switch does something similar
[18:27] <miek> mine too :)
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[18:35] <Vaizki> daey: yea that looks like a weather station transmitter or similar where they just send long pulse for 0 and short for 1
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[18:41] <fsphil> looks like there's a value counting up in it
[18:41] <Vaizki> horribly inefficient way to transfer data but...
[18:44] <Vaizki> I have temperature transmitters in the house that send a preamble to establish timing for the receiver and then use transitions to signal 0/1.. so if signal stays at same level for one "clock", it's a 0, if it changes level then it's a 1
[18:46] <Vaizki> not sure if that type of encoding even has a "name" .. :)
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[18:48] <R34lB0rg> if it has a name, it probably has a patent
[18:48] <fsphil> pulse length encoding
[18:48] <fsphil> (I just made that up)
[18:48] <R34lB0rg> the faster patents expire, the faster progress can be made
[18:48] <Vaizki> no sorry I just recalled.. every clock cycle causes a level shift but if there is an additional level shift inside the cycle then it's a 1, otherwise a zero
[18:49] <R34lB0rg> sounds like bar codes
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[18:51] <Vaizki> I should probably get a NRX2 and try to make my own receiver ;)
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[18:56] <fsphil> yeah it's a weather station
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[19:16] <fsphil> last sample says it was 12.8c :)
[19:17] <fsphil> http://www.f6fbb.org/domo/sensors/tx3_th.php
[19:19] <Vaizki> bcd! \o/
[19:19] <fsphil> havn't seen that since the 6502
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[19:23] <fsphil> the parity bit in the samples doesn't always seem to be valid
[19:23] <fsphil> but definitly received correctly
[19:26] <Vaizki> checksum matches but parity bit doesn't?
[19:27] <fsphil> the parity only covers the address/id
[19:28] <fsphil> didn't check the checksum
[19:28] <fsphil> by received correctly, I mean it's clear which are short and long pulses
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[20:01] <daey> fsphil: awesome. thanks for the link.
[20:04] <daey> fsphil: how does one figure that out.. i mean i got a certain amount correct.. but thats not even remotely close to what that guy managed to do ;_;
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[20:06] <fsphil> when you have one at hand you can usually do more with it
[20:06] <Lunar_Lander> evening
[20:06] <fsphil> since you can see the data on the screen, you know something about what's in the packet
[20:07] <daey> but e.g. the start sequence...why is that even in there?
[20:07] <fsphil> the receiver is listening out for that
[20:07] <daey> why not simply listen for the sensor address
[20:08] <daey> youve gotta pair them anyhow
[20:08] <fsphil> the first part is a preamble, gives the receiver something to sync to
[20:08] <fsphil> allows AFC/AGC to do its thing
[20:09] <fsphil> the rest just helps ensure it's listening to the right data
[20:10] <gonzo_nb> and it must help the decode get in sync and flush out noise from the pre-tx period
[20:11] <gonzo_nb> for 8bit start-stop async, three nulls is about optimal for clearing the uart functionality
[20:11] <fsphil> for OOK the pre-amble just helps it get the levels correct
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[20:15] <gonzo_nb> ok, didn't catch the context
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[20:20] <daey> fsphil: so the sensor does only transmit temp or hygro. in one frame?
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[20:21] <fsphil> seems to yeah
[20:21] <fsphil> the frames you had in your screenshot where all temperature
[20:22] <daey> yeah i just got it.. i guess im very lucky then ioi
[20:22] <daey> i captured 12 frames. all temp. i guess it only sends temp here
[20:22] <fsphil> I didn't check the very bottom one
[20:23] <daey> ironically i managed to find another way to mask the data bits to also get a reasonable temp :P but its wrong
[20:23] <Lunar_Lander> what are you reading out?
[20:24] <daey> well if you simply convert 8 databits to dec. you can get something like 123. > 12.3C
[20:24] <daey> over 12 readouts it made perfect sense as the temp decreased as it should. but the masking had the issue that i couldnt get past 25.6 C :p
[20:26] <fsphil> that's where knowing the actual value helps
[20:26] <fsphil> I would never have thought of BCD
[20:27] <fsphil> Lunar_Lander: mystery signal, which has turned out to be a mystery weather station
[20:27] <daey> true
[20:27] <daey> fsphil: yeah me neither
[20:29] <Lunar_Lander> ;) nice
[20:29] <Ian_> Doesn't the DS18B20 us BCD coding?
[20:30] <daey> so now that im able to decode it by hand. is there a simple way to do it automatically?
[20:30] <daey> can fldigi decode that?
[20:31] <fsphil> nope
[20:31] <fsphil> code it :)
[20:32] <daey> that was my plan. but ive no idea where to start tbh.
[20:32] <fsphil> at a very minimum, you find the min/max values over a period of samples
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[20:32] <fsphil> then measure how long it stays above the average
[20:32] <daey> well first of all i need to have the data to work with
[20:33] <fsphil> how have you recorded it so far?
[20:33] <daey> by hand with gqrx
[20:34] <fsphil> are you familiar with gnuradio at all?
[20:35] <daey> ive heard the name. is it a complete toolset to decode signals?
[20:35] <daey> sounds like it is
[20:37] <fsphil> it's like a radio toolkit
[20:38] <fsphil> quite useful for testing out ideas
[20:38] <fsphil> "gnuradio companion"
[20:38] <fsphil> is a gui for experimenting with it
[20:38] <daey> from what i can tell, theres a python library for it
[20:38] <daey> which should allow me to do what im trying to do correct?
[20:38] <fsphil> python is the glue for it. behind the scenes it's all C++
[20:39] <fsphil> there are modules for reading from your radio, and other modules for doing things like filtering or demodulation
[20:39] <fsphil> you can use it to give you the signal you see in audacity
[20:40] <daey> well im sure measuring the length of each peak shouldnt be the hardest part in that right?
[20:41] <Ian_> Michael Osman of 'Great Scott Gadgets' has a video tutorial series that will give you a good overview before you get to grips with code.
[20:41] <Ian_> https://greatscottgadgets.com/sdr/
[20:43] <fsphil> oh yes good link Ian_
[20:43] <fsphil> that's a great series
[20:44] <russss> yes, very good videos all of those
[20:44] <miek> i'm working on a tool that'll hopefully make it easier/faster to do these first steps of looking at a new signal (instead of audacity etc.) - https://www.youtube.com/watch?v=9QyGKjt8zkE
[20:44] <fsphil> my airspy seems to have decided to no longer work :/
[20:44] <fsphil> inspectrum is your work miek?
[20:45] <miek> yup
[20:45] <fsphil> nice. used it a few times, it's really handy
[20:45] <miek> ah cool :)
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[20:50] <Ian_> Not something that you did to it fsphil, just failure in service?
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[20:53] <fsphil> something I did it seems. reboot cleared it
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[20:57] <fsphil> you have me looking at ISM signals now daey :p
[20:57] <Lunar_Lander> :)
[20:58] <fsphil> there is a loud blip every few minutes, what are the odds it's the same kind of weather station
[20:58] <Vaizki> pretty high
[20:58] <daey> fsphil: :D
[20:59] <daey> its a nice quiz, that one even can permanently benefit from when beating it :>
[20:59] <fsphil> oh and a slow one that sounds like an atari 2600 game
[21:00] <daey> i think i can receive at least 5 transmitters that send on the 433.8Mhz band once a minute. its really busy here
[21:00] <fsphil> very quiet here. just these two that are loud
[21:01] <fsphil> no, it's 48-bits. same OOK keying though
[21:05] <daey> fsphil: http://i.imgur.com/cVYRt9O.jpg the little circle is the signal from earlier
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[21:08] <Lunar_Lander> damn UV physics
[21:08] <fsphil> a bit clearer here
[21:08] <fsphil> http://i.imgur.com/ZCVUetl.jpg
[21:10] <daey> fsphil: what receiver do you use?
[21:11] <fsphil> airspy
[21:18] <daey> fsphil: ah neat, the airspy is available from within the eu. i thought all those things need to be imported from the usa
[21:20] <fsphil> nah
[21:21] <fsphil> all of the samples of this I've caught so far are identical
[21:21] <daey> the temp already dropped. you missed the evening
[21:22] <fsphil> possibly. I'll sample it again in an hour
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[21:23] <prog> airspy ftw!
[21:23] <fsphil> at 48-bits long it's more likely to be 9 bytes
[21:23] <fsphil> rather than the oddball 4-bit bcd thing
[21:24] <daey> prog: how does it compare to the hackrf? the ADC is much better. Freq. range limitation isnt an issue i think. But the bandwidth is only half as big
[21:24] <prog> I'm being a bit biased here: It rocks.
[21:24] <adamgreig> it can't transmit
[21:24] <prog> but it rocks..
[21:24] <adamgreig> which is quite a big deal compared to the hackrf if you want to transmit :P
[21:25] <fsphil> can't transmit, probably safer in the presence of stronger signals
[21:25] <adamgreig> it does otherwise excel as a receiver
[21:25] <daey> adamgreig: :P
[21:25] <fsphil> and it's unlikely you'll need more than 10 mhz bandwidth
[21:25] <daey> as i ve no interest in transmitting that wouldnt matter to me
[21:25] <miek> but transmitting is so fun :<
[21:27] <adamgreig> it is indeed
[21:29] <daey> why is the airspy so much better as a receiver? lower noisefloor? does the higher res. adc make such a big difference?
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[21:31] <daey> btw. are there that many interesting signals sub 24Mhz that it justifies the extra Spyverter?
[21:33] <fsphil> found a potential match online for my blip. if it's a weather station, the sample is saying 5.1c. which would match what it feels like out there
[21:33] <fsphil> humidity is 0xFF. huh
[21:33] <fsphil> that's a percentage
[21:33] <fsphil> guess 100%. well, it is raining
[21:34] <fsphil> http://lucsmall.com/2012/04/29/weather-station-hacking-part-2/
[21:34] <fsphil> slightly better protocol
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[21:41] <Vaizki> fsphil: how do you decode the ook btw?
[21:44] <fsphil> for these, just by eye in audacity
[21:58] <daey> fsphil: well and if its not raining, its foggy :p
[22:00] <fsphil> further down on that page it mentions the range should be 0-100 decimal
[22:00] <fsphil> so 0xFF could be an error
[22:00] <fsphil> maybe the sensor is faulty
[22:01] <fsphil> it might not even be one of these weather stations. will capture another sample, see if it's got colder
[22:01] <daey> yeah. 100% humidity sounds odd
[22:03] <fsphil> yeah, 4.3c
[22:07] Nick change: MoALTz_ -> MoALTz
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[22:49] <Ian_> are there that many interesting signals sub 24Mhz that it justifies the extra Spyverter? Well, most of the HF band can't be all bad.
[22:51] <prog> sure, you have CRI propaganda and HAMs!
[22:52] <Ian_> Lots of utility and military
[22:58] <Ian_> What's CRI?
[23:01] <fsphil> china radio
[23:01] <fsphil> don't forget radio romania!
[23:02] <fsphil> there's little commercial/public broadcasting on SW now
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[23:02] <fsphil> which is kinda sad
[23:03] <Ian_> There are lots of data type signals on HF if only you can figure out what they are about
[23:04] <fsphil> some weather services too, and pilots
[23:04] <Ian_> Good to hear that your Airspy was only having a wee hissy fit and not damaged at all.
[23:04] <fsphil> though the aircraft signals seem to be very very weak here
[23:05] <fsphil> yeah I was messing around with linux, suspect it was that
[23:05] <Ian_> That's where HF really sucks. No tiny high gain antennas!
[23:06] <prog> there are
[23:06] <Ian_> Active antenna?
[23:06] <prog> yep. the one from rfspace is really good: https://twitter.com/pd0swl/status/671793475130650624
[23:07] <Ian_> E Field, is that what looks a bit like a collection of tin cans?
[23:08] <Ian_> Obviously my powers of description are somewhat lacking
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[23:10] <fsphil> they don't seem to be selling them
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[23:17] <SpacenearUS> New position from 03Legionowo after 0310 hours silence - 12http://tracker.habhub.org/#!qm=All&q=Legionowo
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[23:20] <SpacenearUS> New position from 03SP6NVB-11 after 0310 hours silence - 12http://tracker.habhub.org/#!qm=All&q=SP6NVB-11
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[23:51] <dbrooke> fsphil: for my (long since broken) weather station I made use of https://github.com/jimstudt/ook-decoder
[23:58] <schoppenhauer> hi. I am still in a pure research phase. currently I wonder: To get a big balloon up, one needs a large amount of helium. but on the internet, I only find small "party-balloon" suppliers with some integrated faucet to fill small balloons. I'd imagine that any serious attempt for a high altitude balloon flight would need something with a pressure balancer and a long sleeve, right?
[00:00] --- Mon Mar 28 2016