highaltitude.log.20160828

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[00:16] <Ian_> M0RJX I just had a look and see a Uno with 2 x 22pF but seem to think that I used 2 x 18pF. I also believe that the values are not unduly critical - within reason -
[00:18] <Ian_> They are there to provide reactive loading for the crystal and could also be used to trim the frequency slightly - that might be a consideration you should bear in mind.
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[01:13] <SpacenearUS> New position from 03MYM after 039 days silence - 12https://tracker.habhub.org/#!qm=All&q=MYM
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[04:11] Nick change: daey_ -> daey
[04:23] <SpacenearUS> New vehicle on the map: 03DC2EH-11 - 12https://tracker.habhub.org/#!qm=All&q=DC2EH-11
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[05:25] <SpacenearUS> New position from 03SP5RZP-11 after 033 days silence - 12https://tracker.habhub.org/#!qm=All&q=SP5RZP-11
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[05:56] <Darkside_> so yes, i have kind of planted a FSK SSDV transmitter in a park
[05:57] <Darkside_> >_>
[06:03] <Upu> can't you get arreseted for stuff like that ?
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[06:16] <Darkside_> Upu: >_>
[06:17] <Darkside_> well im now 35km away from the transmitter
[06:17] <Darkside_> 19200 baud is still coming through OK
[06:17] <Darkside_> seems to be a little bit too weak for 115200
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[06:25] <Darkside_> ok with some gain tweaking it works better
[06:33] <Darkside_> ok, 115200 works with a yagi
[06:33] <Darkside_> not with the omni tho
[06:33] <Darkside_> boo
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[06:53] <SpacenearUS> New vehicle on the map: 03tt_chase - 12https://tracker.habhub.org/#!qm=All&q=tt_chase
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[09:08] <SpacenearUS> New vehicle on the map: 03ZURG - 12https://tracker.habhub.org/#!qm=All&q=ZURG
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[09:13] <jakeio> Hey, do you think that if I contact the CAA by phone on Tuesday, they might extend the window and allow me to fly again next weekend? I really want to have a successful SSDV flight to talk about in my personal statement!
[09:16] <daveake> Worth a try; depends on staffing and how much they have on
[09:16] <jakeio> I'll give it a go.
[09:17] <daveake> They're doing the permanent permissions this week so might be busy
[09:17] <jakeio> People have permanent permission!?
[09:17] <daveake> Some do yes
[09:17] <daveake> Permanent permission, with notams issued on request
[09:18] <jakeio> Wow, didn't know that was a thing, I assume CUSF have that?
[09:18] <daveake> There used to be some sites with permanent notams but pilots complained of "a wall of notams at Cambridge" :/
[09:19] <edmoore> cusf have that yes
[09:19] <edmoore> the permenant notam was a nice thing
[09:19] <edmoore> the legacy of my great friendship with david miller
[09:19] <daveake> :)
[09:20] <jakeio> Is he the only one who does the permissions?
[09:21] <jakeio> As he's the only one I've spoken to or who has emailed me in my 2 flights (not a great sample size I know).
[09:21] <daveake> In practice, pretty much
[09:21] <daveake> His boss can do them too
[09:21] <daveake> But the notams can be done by several people there as it's automated
[09:21] <daveake> tap tap permission reference tap tap time and date tap tap done
[09:22] <jakeio> What does he have to do to give us permission? I assume it's quite a lot as there's such a delay.
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[09:22] <daveake> I don't know exactly, but his boss told me "it'd take me 30 minutes to show someone"
[09:23] <pb0ahx-weg> !flights
[09:23] <SpacenearUS> 03pb0ahx-weg: Current flights: 03SKIPI and SKIPI2 Launch 10(36e5), 03PS-68 434.650 OLIVIA 8/250 Enable RSID 10(b3db)
[09:24] <daveake> jakeio does your notam/permission say "one flight only"?
[09:24] <jakeio> Yeah...
[09:24] <jakeio> Unfortunately.
[09:24] <daveake> shame otherwise you could launch today or tomorrow
[09:24] <jakeio> I have no more balloons though.
[09:24] <daveake> you may have a stockist 20 mins away
[09:25] <jakeio> Well, I'll try on Tuesday, as I highly doubt he works on bank holiday weekends!!
[09:26] <daveake> er no
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[09:48] <M0RJX> upu please be there !!!
[09:49] <Upu> sup ?
[09:50] <M0RJX> just txted
[09:51] <M0RJX> The isp gives an error 0x0c
[09:51] <M0RJX> any ideas Same on yours and mine
[09:51] <Upu> got it the right way round ? Pin one is next to <
[09:51] <M0RJX> Seems to happen after I flicked to external crystal
[09:51] <M0RJX> spent 4 hours debuging yesterday
[09:51] <Upu> can you read fuses in ATMEL Studio ?
[09:52] <M0RJX> pluged yours intoday to see what I have done wrong and same error
[09:52] <M0RJX> No
[09:52] <Upu> try that
[09:52] <M0RJX> Thats the prob AVRISPMKII
[09:52] <M0RJX> Woks fine before changing the fuse settings
[09:53] <M0RJX> and then bang 0X0C
[09:53] <M0RJX> I have a dragon I could try
[09:53] <M0RJX> Waht is intersting is that its the same prob on both
[09:54] <M0RJX> I thought it was me unitll just now
[09:54] <M0RJX> I thougth the rfm module might be competing with the atmega
[09:54] <fsphil> good quote to use out of context: "<M0RJX> I have a dragon I could try"
[09:55] <M0RJX> :-)
[09:55] <M0RJX> Upu, what programmer do you use?
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[10:06] <Upu> Sorry rob baby stuff bbl
[10:07] <SpacenearUS> New vehicle on the map: 03maverick_chase - 12https://tracker.habhub.org/#!qm=All&q=maverick_chase
[10:07] <Upu> Olimex Avr 500 job
[10:08] <M0RJX> ok im pretty sure it's the hope rf on the line I have a 10K pullup but not enough should I make it larger or smaller
[10:08] <M0RJX> Upu, chers
[10:08] <Upu> Check you can read fuses first
[10:12] <M0RJX> This is tp do with spi and chip select I'm sure of it
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[10:23] <SpacenearUS> New vehicle on the map: 03HORUSLORA - 12https://tracker.habhub.org/#!qm=All&q=HORUSLORA
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[10:40] <SpacenearUS> New position from 03PS-68 after 0320 hours silence - 12https://tracker.habhub.org/#!qm=All&q=PS-68
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[11:02] <SpacenearUS> New position from 03IV3SRD-11 after 039 hours silence - 12https://tracker.habhub.org/#!qm=All&q=IV3SRD-11
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[11:06] <SpacenearUS> New position from 03KD2EAT-8 after 0312 hours silence - 12https://tracker.habhub.org/#!qm=All&q=KD2EAT-8
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[11:51] <SpacenearUS> New position from 03K6RPT-11 after 0311 hours silence - 12https://tracker.habhub.org/#!qm=All&q=K6RPT-11
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[13:16] <SpacenearUS> New position from 03KD0HIP-7 after 03a day silence - 12https://tracker.habhub.org/#!qm=All&q=KD0HIP-7
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[13:26] <SpacenearUS> New vehicle on the map: 03OK1RPL-11 - 12https://tracker.habhub.org/#!qm=All&q=OK1RPL-11
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[14:30] <SpacenearUS> New vehicle on the map: 03BLACKOPS_chase - 12https://tracker.habhub.org/#!qm=All&q=BLACKOPS_chase
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[14:48] <SpacenearUS> New vehicle on the map: 03UBSEDS20 - 12https://tracker.habhub.org/#!qm=All&q=UBSEDS20
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[15:19] <Geoff-G8DHE> richardeoin, Nothing critical but noticed that the dl-fldigi 3.25.12 doesn't appear to allow export of the waterfall PNG, accepts a path but nothing appears...
[15:29] <Geoff-G8DHE> I guess really ^^^^ applies to jcoxon thinking about it!
[15:30] <richardeoin> Geoff-G8DHE: not too surprising there's some niggles, but yes I could have a look
[15:31] <richardeoin> you're on windows I guess?
[15:32] <richardeoin> If you fancy putting in a issue on jcoxon's github for it that'd be great, otherwise will try to have a look anyhow
[15:32] <mfa298> I finally managed to get a test going of both versions on windows, both seem to be doing ok on windows with 300 baud :)
[15:33] <mfa298> just going to bump it to 600
[15:34] <mfa298> and I've got enough distance to make it a reasonably weak signal
[15:35] <Geoff-G8DHE> Yup Windows, I was going to but he seems to have the Issues button not available ...
[15:36] <Geoff-G8DHE> but no don't worry its not critical, just my habit to log the png's to the folder with the rest of the data, but its not critical at all.
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[15:40] <mfa298> richardeoin: 600 baud test the new version isn't doing as well as the old one, but not much in it. Certainly much better than when the decoder was bad.
[15:40] <mfa298> this could be down to errors in timing in my code (pi bitbanging the rtty)
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[15:57] <jakeio> So, daveake
[15:57] <jakeio> you have BUZZ and ZURG...
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[16:15] <SpacenearUS> New vehicle on the map: 03UBSEDS19 - 12https://tracker.habhub.org/#!qm=All&q=UBSEDS19
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[16:30] <kemsp> hi guys, i am running into a bit of trouble with building a reciver from ausb SDR. Any good links for me?
[16:32] <SpeedEvil> what trouble?
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[16:48] <Ian_> M0RJX what values of caps are you using with your crystal - did you copy my comment last night?
[16:49] <M0RJX> Opps no I got to the bottom in the end I think it was poor soldering as I did another board and it worked.
[16:49] <Ian_> I don't know if you use a boards.txt file with your setup or just set the fuses?
[16:49] <M0RJX> I'm now moving to a stencil and oven :-)
[16:49] <M0RJX> Just set the fuses
[16:50] <M0RJX> 0XFF 8mhz 64 iirc
[16:50] <Ian_> Right, your first answer there was just a bit of distraction eh?
[16:50] <M0RJX> Ian_, opps :-)
[16:51] <M0RJX> I thought it was the second spi device
[16:51] <M0RJX> but no ! Doh!
[16:52] <Ian_> It's all well swapped out in my memory, but the last fuse has an anomaly. Some 1 fill the top byte and some 0 fill. Your programmer may not like one or the other.
[16:52] <Ian_> Give me a moment and I'll did up the url of the program that I use to understand things.
[16:54] <M0RJX> Thanks
[16:54] <Ian_> http://www.engbedded.com/fusecalc/ select your device from the miniscule drop down list and give it a whirl.
[16:54] <Ian_> You didn't answer the capacitor question!
[16:55] <SA6BSS-Mike> 16pf usuly works well
[16:57] <Ian_> I know but that wasn't the question. What values are you using M0RJX?
[16:58] <Ian_> 16pF, 18pF, 22pF the value doesn't seem overly sensitive, but at some point you will luck out maybe at 27pF - who knows.
[16:58] <Ian_> The other thing is that the value will have some small bearing on the exact frequency I would imagine!
[16:58] <Ian_> Crystal pulling being another subject entirely.
[16:59] <Ian_> But thanks SA6BSS-Mike your input is appreciated.
[17:02] <Ian_> The pull down menu actually responds if you type in the name Atmega328p (presumably)
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[17:02] <Ian_> A little easier on the eyes - I view a 19" monitor from 1.7m
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[17:10] <kemsp> using a nooelec R820T SDR but windowze refuses to start it (code 10) when I use the zadig tool to put in the drivers
[17:16] <SA6BSS-Mike|2> tried another usb port
[17:16] <SA6BSS-Mike|2> anothe computer
[17:16] <SA6BSS-Mike|2> ?
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[17:45] <Laurenceb__> http://www.aero-news.net/images/content/general/2016/Klyde-Aug-26-2016.jpg
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[17:57] <SpeedEvil> yeah - it was utterly underwhelming :)
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[18:00] Action: Laurenceb__ was reading about hydrogen safeing for airships
[18:00] <Laurenceb__> https://www.youtube.com/watch?v=Bv_Dgt-6Frg
[18:00] <Laurenceb__> also firewalls are possible
[18:01] <SpacenearUS> New vehicle on the map: 03BALLOONOLO-CHASE_CAR - 12https://tracker.habhub.org/#!qm=All&q=BALLOONOLO-CHASE_CAR
[18:02] <Laurenceb__> people have used really fine water mist in H2, it seems to be possible to stop it burning without a massive decrease in lift
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[18:04] <SpeedEvil> I doubt that. A number of german airships filled with H2 caught on fire, and a fine mist spray diddn't help at all.
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[18:06] <Laurenceb__> huh they didnt have any fine mist spray to hand
[18:07] <SpeedEvil> Sorry - too subtle.
[18:07] <SpeedEvil> Mist = poop in german.
[18:07] <SpeedEvil> (ish)
[18:07] <Laurenceb__> oh
[18:08] <Laurenceb__> I'm unconvinced by the airlander thing, it needs to be bigger to gain efficiency
[18:08] <Laurenceb__> container freight by supermassive H2 airship seems to make economic sense
[18:08] <SpeedEvil> The airlander is ~1 container?
[18:09] <Laurenceb__> yeah
[18:09] <Laurenceb__> prob 15 to 20k containers is possible with E-glass framed H2 airship
[18:09] <SpeedEvil> I can see it being useful where a helicopter is just too small
[18:09] <Laurenceb__> yeah
[18:09] <SpeedEvil> And a hell of a lot safer in some ways.
[18:10] <Laurenceb__> 2km long and 450m diameter or so, with marine diesel power
[18:10] <craag> that'd be fun to anchor in a breeze
[18:10] <SpeedEvil> If everyone here threw in a tenner, we could ... actually - never mind
[18:10] <Laurenceb__> heh
[18:10] <Laurenceb__> craag: larger airships are actually easier to contrl
[18:10] <SpeedEvil> that's the annoying part about ideas that don't scale
[18:11] <Laurenceb__> a 2km long thing wouldnt even need a hanger
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[18:11] <SpeedEvil> do you have a rough guesstimate as to cost vs a large ship to buy?
[18:12] <Laurenceb__> but yeah, supermassive airships are very nice and practical, but kind of expensive in absolute terms
[18:13] <Laurenceb__> I was going to work this out and make a ROI optimiser script.. then proper work intervened
[18:13] <Laurenceb__> but E-glass stood out as by far the best construction material
[18:13] <SpeedEvil> The above could also invoke an entirely new kind of passenger travel
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[18:14] <SpeedEvil> Though I'm struggling to see how it'd actually be marketable for that
[18:14] <SpeedEvil> :)
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[18:15] <Laurenceb__> the main problem would be fibreglass market elasticity
[18:16] <Laurenceb__> building an airship would use about an order of magnitude larger fraction of global e-glass production than an equivalent ships fraction of steel
[18:17] <SpeedEvil> yea - it's possibly at the point you find a struggling e-glass manufacturer, and make them an offer they can't refuse
[18:17] <SpeedEvil> e-glass gigafactory
[18:17] <Laurenceb__> heh itd be almost on that scale
[18:17] <SpeedEvil> There are confused reports about Musk doing that with CF in various ways
[18:17] <Laurenceb__> price would prob be about 4x ship cost, but speed would be ~4 times faster
[18:18] <Laurenceb__> and energy use would be 4 times lower
[18:18] Action: SpeedEvil wonders about beamed power.
[18:18] <Laurenceb__> marine diesel has the advantage of lots of waste heat
[18:18] <Laurenceb__> that solves the ballast problem
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[18:19] <SpeedEvil> ah
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[18:20] <Laurenceb__> https://i.sli.mg/RoNY06.png
[18:21] <SpeedEvil> I assume you need ballast for load variation?
[18:21] <Laurenceb__> I got as far as simulating internal fibreglass insulated ballonettes heated with exhaust heat exchangers
[18:21] <Laurenceb__> yes
[18:22] <SpeedEvil> Simulation is fun.
[18:22] <Laurenceb__> hot H2 ballonettes outperformed hot air, even if the hot H2 had a N2blanket
[18:22] <Laurenceb__> y axis should be tonnes
[18:22] <SpeedEvil> You can get ~200km from a battery-powered man-carrying dolphin thing at 10km/h or so.
[18:23] <Laurenceb__> H2 lift is 1.14Kg/m^3, so it works really well
[18:23] <SpeedEvil> Bit less than that I guess at operating altitude
[18:23] <Laurenceb__> also it only needs to be at ~150C, so cheapish plastics can be used
[18:24] <SpeedEvil> that's pretty much at kapton type levels
[18:24] <Laurenceb__> or even some sorts of mylar
[18:24] <Laurenceb__> as its a reducing atmosphere
[18:25] <Laurenceb__> with thermal ballast control you can use pressurised water and reaction engines style heat exchangers to change bouyancy with little energy loss
[18:26] <SpeedEvil> Interesting
[18:26] <Laurenceb__> seems a much better idea that the aeroscraft compressed He
[18:26] <SpeedEvil> 'OMG OMG OMG - Hydrogen - run away'
[18:26] <Laurenceb__> I should add some horizontal lines to the plot for aeroscraft with CF and glass fibre tanks
[18:27] <SpeedEvil> Every investor thinks they know about the lessons from the hindeberg
[18:27] <SpeedEvil> Also, I suspect many safety officials.
[18:33] <SpacenearUS> New vehicle on the map: 03BALLOONOLO-7_LORA - 12https://tracker.habhub.org/#!qm=All&q=BALLOONOLO-7_LORA
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[18:59] <Ian_> Interesting about the droplets from the misting in a hydrogen atmosphere, how's about charge build ups from that?
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[19:15] <SpacenearUS> New vehicle on the map: 03iv3iim_chase - 12https://tracker.habhub.org/#!qm=All&q=iv3iim_chase
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[19:17] <SpeedEvil> https://www.youtube.com/watch?v=xbiqoAKvjlY - these things are getting silly.
[19:17] <SpeedEvil> (fpv brushless teeny)
[19:19] <SpeedEvil> Shows how far electronics and sensors have come - utterly uncontrollable manually
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[20:23] <M0RJX> Can you reflow without a stencil?
[20:24] <Ian_> You can but it's likely to be laborious, hit and miss and stressful
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[20:24] <M0RJX> worse thatn soldering small cihps by hand
[20:28] Action: Laurenceb__ as been trying to solder a load of LSM9DS1 sensors
[20:28] <Laurenceb__> not fun
[20:28] <Laurenceb__> got about 70% failure rate with reflow, then even with some manual touch up it often took several attempts
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[20:32] <mattbrejza> Laurenceb__: 0.5mm LGA?
[20:32] <Laurenceb__> 0.38 or so
[20:32] <Laurenceb__> and 24 pins
[20:33] <mattbrejza> oh, ive only used the two package ST 9 axis IMU solkution
[20:33] <mattbrejza> thats 0.5mm though
[20:33] <Laurenceb__> the main pain is that the pads tend to oxidise rather than tin
[20:33] <Laurenceb__> so you end up with nice looking reflowed solder but dry joints
[20:33] <mattbrejza> cant say i even assembled any of these anyway...
[20:35] <Laurenceb__> I have one board that works
[20:35] <Laurenceb__> until it doesnt
[20:35] <Laurenceb__> I suspect intermittent dry joint on the address pin
[20:36] <Laurenceb__> half my problem is probably trying to reflow with hot air
[20:36] <Laurenceb__> it just doesnt work very well
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[20:42] <SpeedEvil> I was looking at reflow using 0% O2.
[20:43] <SpeedEvil> It looks interestingly more workable in some cases
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[20:44] <Laurenceb__> nice idea
[20:45] <Laurenceb__> hmm
[20:45] <Laurenceb__> hot N2 tool?
[20:45] <Laurenceb__> N2 can be generated quite easily with membrane separators too
[20:45] <Laurenceb__> this could be an interesting tool
[20:46] <SpeedEvil> I was more meaning in an oven
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[20:47] <SpeedEvil> From memory, you need under 1% to get much solderability benefit
[20:47] <Laurenceb__> yeah, but thats prob harder to pull off
[20:47] <Laurenceb__> ah ok
[20:47] <SpeedEvil> It's a pity you can't really use active reducing gasses, but the chemistry isn't really there
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[20:48] <Laurenceb__> hot H2 tool
[20:48] <Laurenceb__> what could possibly go wrong
[20:50] <samme> Hi. What type of altitude does TinyGPS++ provide?
[20:53] <DoYouKnow> hi. has anyone here decoded NUDET?
[20:53] <DoYouKnow> GPS L3
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[20:54] <DoYouKnow> I was thinking of breaking each signal into 11 different pieces, then trying to xor each piece with the data 2^(11-1) times
[20:55] <DoYouKnow> trying each pattern like 11111111111 11111111101, etc
[20:55] <DoYouKnow> sory 1111111111 1111111101
[20:55] <DoYouKnow> added an extra 1 there
[20:56] <DoYouKnow> then for each pattern like that, computing the signal strength
[20:56] <DoYouKnow> and doing that every timestep
[20:56] <SpeedEvil> The length of the spreading code is too long
[20:56] <DoYouKnow> there are 1024 different combinations
[20:56] <DoYouKnow> it only flips every 93 bits
[20:57] <DoYouKnow> probably won't be possible in realtime
[20:58] <DoYouKnow> maybe it will be
[20:58] <DoYouKnow> with a fast computer
[20:58] <Laurenceb__> you mean decoding GPS ?
[20:58] <DoYouKnow> decoding GPS L3
[20:58] <DoYouKnow> not L1
[20:58] <Laurenceb__> as in SDR
[20:58] <DoYouKnow> the NUDET payload
[20:58] <Laurenceb__> oh
[20:58] <DoYouKnow> yes, with an SDR
[20:58] <Laurenceb__> I'm not familiar with it
[20:58] <DoYouKnow> well, it basically broadcasts time series of pulses
[20:58] <Laurenceb__> I looked at SDR on arm cortex a couple of years ago
[20:59] <Laurenceb__> prob doable but a lot of work
[20:59] <DoYouKnow> well, I'm trying to modify gnss-sdr
[20:59] <DoYouKnow> I just want it to loop through each of these patterns for every PRN
[21:01] <DoYouKnow> then instead of processing each chunk as a the whole prn it's a 93-bit truncated PRN
[21:01] <DoYouKnow> instead of 1023 bits
[21:01] <DoYouKnow> so it's smaller in some ways
[21:03] <DoYouKnow> then I guess the result would be XOR subsequent 93-bit PRNs
[21:03] <DoYouKnow> well, the output of the correlator
[21:03] <DoYouKnow> XOR the output of the correlator for each 93 bit Data+code segment
[21:03] <edmoore> This sounds like gps chat
[21:04] <DoYouKnow> yes, edmoore
[21:05] <edmoore> I have seen correlations against smaller chunks of prn before
[21:05] <edmoore> For resource limited things
[21:05] <SpeedEvil> you need enough SNR though
[21:05] <edmoore> Yes
[21:06] <SpeedEvil> From memory, I thought the L3 signals were days long
[21:06] <SpeedEvil> (repeat)
[21:06] <SpeedEvil> I may have been thinking of L2
[21:07] <DoYouKnow> L3 signals are short bursts
[21:07] <DoYouKnow> like a few seconds long
[21:07] <DoYouKnow> they occur every few seconds
[21:08] <DoYouKnow> I think
[21:08] <SpeedEvil> What signal description have you found
[21:09] <russss> I've been looking at RTK stuff recently
[21:09] <DoYouKnow> http://arxiv.org/pdf/1007.1801v2.pdf
[21:10] <Laurenceb__> SpeedEvil: you are thinking of L2
[21:10] <Laurenceb__> but L3 might be similar, never looked at it lol
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[21:11] <SpeedEvil> L3 is implied to be simple on-off-keyed C/A code modulated 1381.05MHz
[21:11] <SpeedEvil> https://books.google.co.uk/books?id=lvI1a5J_4ewC&pg=PA73&lpg=PA73&dq=GPS+L3+signal+NUDET&source=bl&ots=k7tcNpKWBu&sig=_qN_Dek_aJwWcU_TIWaNFPvwbBI&hl=en&sa=X&ved=0ahUKEwiu_pOPguXOAhWMKcAKHYSrBOIQ6AEIVTAJ#v=onepage&q=GPS%20L3%20signal%20NUDET&f=false
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[21:11] <SpeedEvil> In principle it would be trivial to decode, given you're locked to L1
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[21:13] <Laurenceb__> interesting
[21:13] <Laurenceb__> civilian ionospheric correction
[21:13] <SpeedEvil> I would be surprised if it wasn't modulated very similarly to L1, with a 50bps signal
[21:14] <SpeedEvil> encrypted with a key of its own of course.
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[21:17] <SpeedEvil> https://upload.wikimedia.org/wikipedia/commons/9/96/Global_Positioning_System_satellite.jpg pizzasat
[21:18] <SpacenearUS> New position from 03MYM after 0320 hours silence - 12https://tracker.habhub.org/#!qm=All&q=MYM
[21:18] <DoYouKnow> SpeedEvil: I read online that you can't trust the output of the correlator for the full 1023 bit sequence, since each PRN chip is longer than the data rate
[21:19] <DoYouKnow> each PRN sequence rather
[21:19] <SpeedEvil> I don't understand what you mean.
[21:19] <SpeedEvil> the PRN sequence is completely predictable for each chip
[21:19] <DoYouKnow> the data rate is at 11000 Bits/sec, 1.023 Mbit sec/1023 = 1 kHz
[21:20] <DoYouKnow> so 11000 Bits/sec vs. 1 kHz
[21:20] <DoYouKnow> this flips the phase of the PRN
[21:20] <DoYouKnow> midway through
[21:20] <DoYouKnow> about 11 times in the full prn
[21:20] <DoYouKnow> each flip can last 93 bits
[21:20] <SpeedEvil> What do you mean the data rate is 11000bps - it's 50bps, multiplied by 20.
[21:20] <SpeedEvil> for each sat
[21:21] <SpeedEvil> (multiplied by 20 as each bit is transmitted 20 times)
[21:21] <DoYouKnow> oh, for L3?
[21:21] <SpeedEvil> No, for L1
[21:21] <DoYouKnow> I was talking about for L3
[21:21] <SpeedEvil> Stating random info isn't helpful - do you have a specific document on L3?
[21:24] <DoYouKnow> http://arxiv.org/pdf/1007.1801v2.pdf
[21:25] <DoYouKnow> "However, when the L3
[21:25] <DoYouKnow> modulation kicks in, the coherence length drops from 1 ms to 90.9 ┬Ás and the 1 ms measurement
[21:25] <DoYouKnow> drops dramatically, while the other measurement remains unchanged. This detection method has
[21:25] <DoYouKnow> been demonstrated with sampled data taken during one of the L3 system-wide tests."
[21:25] <SpacenearUS> New position from 03PS-68 after 0311 hours silence - 12https://tracker.habhub.org/#!qm=All&q=PS-68
[21:26] <DoYouKnow> I also have a ppt printed out
[21:27] <DoYouKnow> this is it: http://www.astron.nl/rfi/presentations/RFI2010.session.7.3.Nigra.pdf
[21:27] <DoYouKnow> try visiting there SpeedEvil
[21:27] <Vaizki> so are you done hunting for government mind control signals in the SDR noise floor then?
[21:27] <DoYouKnow> lol
[21:28] <Vaizki> indeed
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[21:28] <SpeedEvil> Simply put a very, very modest dish on your SDR
[21:28] <SpeedEvil> this will let you directly decode the 11kbps
[21:29] <SpeedEvil> (when pointed at a sat)
[21:33] <DoYouKnow> I want to receive it indoors, though
[21:34] <Vaizki> I want cake
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[21:35] <SpeedEvil> If you are trying to do astronomical and sigint stuff and won't put an antenna outdoors - just give up.
[21:40] <DoYouKnow> well, my dad won't let me do it
[21:40] <DoYouKnow> he said "no"
[21:40] <DoYouKnow> and I have work tomorrow
[21:41] <DoYouKnow> I have the dish, but he hasn't been letting me use it
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[21:42] <DoYouKnow> for weeks
[21:43] <Laurenceb__> http://i.imgur.com/Pn9TxBM.gif
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[21:46] <M0RJX> http://i.imgur.com/CULfa9c.jpg
[21:47] <M0RJX> lol
[21:47] <M0RJX> This is my new dev board for icarus 4
[21:48] <M0RJX> saves all those cables
[21:48] <M0RJX> wires even
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[21:53] <amell> edmoore: heard anything from Scotland?
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[21:54] <amell> adamgreig: are you in Scotland?
[21:57] <fsphil> that happens in scotland stays in scotland
[21:57] <fsphil> especially haggis
[21:58] <amell> Lol.
[21:59] <amell> I was there yesterday. Cusf were allegedly still fettling their rocket
[21:59] <amell> Wanted to know if it actually got launched
[22:04] <SpacenearUS> New position from 03VK3YT-11 after 03a day silence - 12https://tracker.habhub.org/#!qm=All&q=VK3YT-11
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[22:29] Nick change: nigelvh -> Guest68387
[22:29] Nick change: Guest68387 -> nigelvh
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[23:15] <SpacenearUS> New position from 03IV3SRD-11 after 039 hours silence - 12https://tracker.habhub.org/#!qm=All&q=IV3SRD-11
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[00:00] --- Mon Aug 29 2016