highaltitude.log.20160207

[00:00] <SpacenearUS> New position from 03D-9 after 0310 hours silence - 12http://tracker.habhub.org/#!qm=All&q=D-9
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[00:36] <Darkside>
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[05:46] <SpacenearUS> New vehicle on the map: 03joey@2164_chase - 12http://tracker.habhub.org/#!qm=All&q=joey%402164_chase
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[11:08] <SpacenearUS> New vehicle on the map: 03HB9HFJ-11 - 12http://tracker.habhub.org/#!qm=All&q=HB9HFJ-11
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[11:59] <SpacenearUS> New vehicle on the map: 03Iw2ofo_chase - 12http://tracker.habhub.org/#!qm=All&q=Iw2ofo_chase
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[14:18] <astrobiologist> afternoon all
[14:18] <astrobiologist> has anybody connected to the uBlox8 using spi or i2c?
[14:22] <adamgreig> yea
[14:23] <adamgreig> i2c
[14:27] <astrobiologist> is there any example arduino code adamgreig?
[14:27] <adamgreig> no idea
[14:27] <adamgreig> I don't use arduinos, sorry
[14:27] <adamgreig> I imagine some exists somewhere
[14:28] <astrobiologist> ah
[14:28] <astrobiologist> the ublox8 manual says their i2c is not bidirectional
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[14:29] <adamgreig> uh
[14:29] <adamgreig> it is
[14:29] <astrobiologist> well, to be exact it says it can only be one direction at a time
[14:29] <amell> bi-unidirectional then?
[14:29] <adamgreig> that's how i2c works
[14:29] <adamgreig> it's half duplex
[14:30] <astrobiologist> so how in practice do you switch it over? I.e set flight mode etc and then switch over?
[14:30] <adamgreig> but that's entirely normal i2c
[14:30] <adamgreig> no
[14:30] <adamgreig> the switchover is jsut part of the i2c protocol
[14:30] <adamgreig> one bit of the address the master sends out is read/write, if it's read then the master will continue sending clock pulses but won't assert data, so it can read data asserted by the slave
[14:31] <astrobiologist> I guess I need to look at some example i2c arduino code
[14:31] <adamgreig> additionally at the end of each transmitted byte, the receiver sends an acknowledge bit (or not)
[14:31] <adamgreig> might help
[14:31] <adamgreig> I'd read the wikipedia entry on i2c
[14:31] <astrobiologist> I am looking at a slightly weird arduino chip that doesn't have serial
[14:32] <craag> a microcontroller without serial
[14:32] <craag> what is this abomination?
[14:32] <adamgreig> are you sure it doesn't have serial?
[14:32] <astrobiologist> to be exact, it only has Bluetooth ble
[14:33] <adamgreig> "only"?
[14:33] <astrobiologist> and Bluetooth ble doesn't have serial (Bluetooth classic does)
[14:33] <adamgreig> as in, it only has one serial port, and that serial port is in use to talk to a BLE modem?
[14:33] <astrobiologist> yes
[14:33] <adamgreig> so whether BLE has serial or not is kind of irrelevant?
[14:34] <adamgreig> what exactly are you using?
[14:34] <astrobiologist> light blue bean
[14:34] <fsphil> good to know there are people worse at naming things than I am
[14:35] <adamgreig> I see
[14:35] <adamgreig> yes
[14:35] <astrobiologist> there's definitely no serial, except a virtual bluetooth serial that only works on macs
[14:35] <adamgreig> you can use i2c on that to talk to a ublox 8 no problem
[14:35] <adamgreig> well like
[14:35] <adamgreig> the BLE serial isn't the concern
[14:35] <adamgreig> it's that the microcontroller's serial peripheral is connected to the bluetooth modem
[14:35] <adamgreig> and so can't be used to talk to the ublox
[14:35] <adamgreig> you could use software serial as an alternative, that'd work
[14:36] <astrobiologist> you mean bitbashing?
[14:37] <astrobiologist> https://punchthrough.com/bean/guides/getting-started/tech-specs/
[14:38] <adamgreig> yes, bitbanging the serial
[14:38] <adamgreig> i'd probably go with i2c over that
[14:38] <astrobiologist> this is first and foremost a bluetooth-centric device for making remote sensors, wearables etc
[14:38] <amell> is there any spi?
[14:39] <astrobiologist> yes
[14:39] <amell> how are you uploading code to this device?
[14:39] <astrobiologist> what I like about it is that it is _programmable_ over bluetooth as well
[14:39] <astrobiologist> so the entire shebang is wireless
[14:40] <astrobiologist> all you need is an android phone or an ios device that has ble
[14:40] <amell> sure, but entirely useless if it cant talk to gps.
[14:40] <astrobiologist> true amell, hence my questions today
[14:40] <amell> dont you need a radio interface too?
[14:40] <astrobiologist> but presumably an arduino i2c or spi library would get it talking to the ublox8
[14:40] <fsphil> bluetooth is a radio interface
[14:41] <amell> but its not a LoRA interface
[14:41] <astrobiologist> amell it has pwm pins etc so it should be easy to get it to work with an ntx2b
[14:41] <amell> okay.
[14:41] <amell> wait.
[14:41] <amell> if it can talk to a ntx2b, it can do serial
[14:42] <astrobiologist> I have very little space, or time, to prototype so a board that needs no physical connections at all to program is fun to play with
[14:42] <astrobiologist> I could use my 'phone!
[14:42] <fsphil> developing on a phone sounds horrible ;)
[14:42] <astrobiologist> amell I don't think there is any way to get at its uart
[14:42] <astrobiologist> so you would have to try i2c or spi
[14:42] <amell> softwareserial?
[14:42] <fsphil> just use i2c
[14:43] <astrobiologist> I find them both quite scary when I read up on them
[14:43] <fsphil> it's known to work
[14:43] <astrobiologist> on the ukhas pages it says the ubloxs are fussy about timings so software serial was not advised
[14:43] <amell> i assure you it works.
[14:44] <astrobiologist> but willing to try i2c particularly if anybody could point me in the direction of some example code (same goes for bitbashing serial for that matter :-)
[14:45] <astrobiologist> it's a strange beast because it throws in for free some other things like a temperature sensor and accelerometer, and some custom C commands.
[14:46] <astrobiologist> I found the naked Apk for the compiler and uploader on the 'net and they run on my Blackberry, so not impossible to type in... for £20 I might try it
[14:46] <amell> what is this board?
[14:46] <amell> oh i see it now
[14:46] <fsphil> yeah trying to do actual dev with an on screen keyboard would drive a person mad
[14:47] <amell> light blue bean
[14:48] <amell> https://punchthrough.com/bean
[14:48] <amell> looks interesting
[14:48] <craag> terrible colour
[14:49] <astrobiologist> I think you'll find that's a light shade of.... blue, craag
[14:49] <craag> It's the blue equivalent of ragworm's orange
[14:49] <astrobiologist> what's this groove connector malarkey?
[14:49] <fsphil> it's the EE logo
[14:50] <amell> ok. why dont you just develop in dropbox
[14:50] <amell> read the info. you can upload progs into dropbox and the iOS loader will load them into the board via BLE
[14:51] <astrobiologist> frankly, I have so little time these days that I was thinking of testing during my commute etc
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[15:23] <SpacenearUS> New position from 03PS-58 after 037 hours silence - 12http://tracker.habhub.org/#!qm=All&q=PS-58
[15:42] <DL7AD> morning
[15:46] <SpacenearUS> New vehicle on the map: 03W5BTR-11 - 12http://tracker.habhub.org/#!qm=All&q=W5BTR-11
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[17:28] <Geoff-G8DHE-Lap> Wow, PS-58 is moving!
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[19:20] <AlvaroPelon> Hello, does anyone have a 5W VHF Amplifier schematic?
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[19:44] <nick___> 7
[19:44] <mattbrejza> 8
[19:44] Nick change: nick___ -> nick_
[19:44] <nick_> Oops
[19:45] <mfa298> AlvaroPelon: you may have more luck from google, a lot of us find 10mW is more than enough
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[19:48] <R34lB0rg> "I am not Google" would make a nice shirt
[19:48] <fsphil> got a link?
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[19:50] <fsphil> AlvaroPelon: 5W is quite a lot of power, if you mean to fly it on a balloon
[19:50] <R34lB0rg> fsphil, https://teespring.com/googleisfree
[19:50] <AlvaroPelon> Yes
[19:50] <mfa298> alternatively there's always http://lmgtfy.com/?q=5W+VHF+Amplifier+schematic
[19:50] <AlvaroPelon> I have a 300mw HX1 VHF Transmitter
[19:51] <AlvaroPelon> And I want to amplifie it to 5W
[19:51] <AlvaroPelon> Is 300mw enough?
[19:51] <fsphil> it's been used successfully before
[19:52] <AlvaroPelon> Range?
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[19:52] <mfa298> I think Leo was doing aprs at 10mW successfully.
[19:52] <SA6BSS-Mike> usulu 10mW aprs 350km and rtty +600km
[19:53] <fsphil> don't recall the exact range, but I don't remember any issues
[19:53] <SA6BSS-Mike> yep, got one of leos over 350km
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[19:53] <mfa298> AlvaroPelon: remember balloons are high up so have good LoS to various igates for aprs
[19:53] <SA6BSS-Mike> 600+ from a 30000m ballon
[19:53] <fsphil> if you have a nearby mountain/tall hill then you might like to try some range tests, just to be confident that it will work
[19:53] <SA6BSS-Mike> 350km from a 9000m floater
[19:54] <AlvaroPelon> Okey, and wich anten
[19:54] <AlvaroPelon> antenna for VHF?
[19:54] <mfa298> the more power you want to transmit the more batteries you need to carry making the payload heavier so more expensive to launch
[19:54] <SA6BSS-Mike> I gor a X300 duaband
[19:54] <fsphil> SA6BSS-Mike: for the payload ;)
[19:54] <SA6BSS-Mike> *duoband
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[19:55] <Vaizki> x300 is a base station antenna though
[19:55] <mfa298> for the payload you can make a larger version of the one on the wiki
[19:55] <mfa298> !wiki payload antenna
[19:55] <SpacenearUS> 03mfa298: Wiki page 03payload_antenna (guides) - 12http://ukhas.org.uk/guides:payload_antenna
[19:55] <SpacenearUS> 03mfa298: Wiki page 03projects:picoatlas:picoatlasi - 12http://ukhas.org.uk/projects:picoatlas:picoatlasi?s[]=payload&amp;s[]=antenna
[19:55] <SA6BSS-Mike> its always a 1/4 wave antennas used
[19:55] <fsphil> !wiki !wiki
[19:55] <SpacenearUS> 03fsphil: Wiki page 03dokuwiki (wiki) - 12http://ukhas.org.uk/wiki:dokuwiki
[19:55] <SpacenearUS> 03fsphil: Wiki page 03syntax (wiki) - 12http://ukhas.org.uk/wiki:syntax
[19:55] <SpacenearUS> 03fsphil: Wiki page 03welcome (wiki) - 12http://ukhas.org.uk/wiki:welcome
[19:55] <SA6BSS-Mike> :)
[19:55] <fsphil> worth a try
[19:56] <mfa298> better than the internet breaking :p
[19:57] <fsphil> been i while since I broke something on the intenret
[19:57] <fsphil> my keyboard on the other hand
[19:57] <SA6BSS-Mike> simple doi antenna that would work on a payload http://www.movl.net/blog/2009/03/my-homemade-2m-14-ground-plane-antenna/
[19:57] <SA6BSS-Mike> https://www.google.se/search?q=quarter+wave+144+mhz+antenna&espv=2&biw=1920&bih=945&tbm=isch&imgil=8ILlqdTH3eodBM%253A%253BwA0RZqszf2EEOM%253Bhttp%25253A%25252F%25252Fwww.mds975.co.uk%25252FContent%25252Famateur_radio_antennas_06.html&source=iu&pf=m&fir=8ILlqdTH3eodBM%253A%252CwA0RZqszf2EEOM%252C_&usg=__oVKlY25ZvVPhgfwBc8JDg_D9u70%3D&ved=0ahUKEwjU96zat-bKAhXCkSwKHfjrDwsQyjcIOg&ei=c6G3VpTyGMKjsgH41
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[20:14] <Vaizki> hmm.. http://store.redpitaya.com/calibrated-diagnostic-kit.html
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[20:14] <Vaizki> I've wondered about the pitaya.. should I have one.. but it seems a bit half baked somehow
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[20:15] <SA6BSS-Mike> thats the one they turned into a sdr tranceiver :)
[20:15] <fsphil> not a fan of the shape of it
[20:15] <Vaizki> it has a 125MSPS 14bit ADC yet somehow the SDR app for it only has 1.2MHz bandwidth
[20:16] <SA6BSS-Mike> its not realy designede as a sdr
[20:16] <fsphil> it's basically a USB ADC, not much else
[20:16] <Vaizki> SA6BSS-Mike: yes, apparently it's not bad as a DUAL receiver and DUAL transmitter :)
[20:16] <fsphil> but that's still very useful for other things
[20:16] <Vaizki> well it's also FPGA + gigabit ethernet
[20:17] <SA6BSS-Mike> that its main purpuse
[20:17] <fsphil> forgot about the gbit ethernet
[20:17] <Vaizki> I don't see why you couldn't direct sample the whole 0-50MHz band with it.. apparently there must be a reason because nobody's done it :)
[20:17] <fsphil> indeed
[20:18] <fsphil> maybe the noise increases as the sample rate goes up
[20:19] <SA6BSS-Mike> but it was just a proof of concept turning it to a sdr, it realy need some more devolpment in the extio a premap and som filtering
[20:19] <Vaizki> fsphil: they are linear parts.. http://cds.linear.com/docs/en/datasheet/21454314fa.pdf
[20:19] <Vaizki> not a cheapskate part either
[20:21] <Vaizki> SA6BSS-Mike: the thing that I wonder about is that Pavel put in a lot of configurable bandwidths for the digitization but they cap at 1.25MHz or something
[20:21] <Vaizki> so there must be a hard limit due to the design there, otherwise why not just go all out with 10,20,50..
[20:22] <SA6BSS-Mike> bc he hacked a redely avalible extio?
[20:22] <Vaizki> ah. hmmmm.. could be!
[20:22] <SA6BSS-Mike> it probably could not be done without a lot of more work
[20:23] <Vaizki> but he did do gnu radio blocks for it also
[20:23] <fsphil> they seem to have linux support, all open source
[20:23] <fsphil> even gnuradio blocks
[20:24] <fsphil> neat
[20:24] <fsphil> you could probably double the price of this, and sell it as an audiophile sound card
[20:24] <fsphil> "you have never heard it properly until it's sampled at 48MHz"
[20:25] <Vaizki> the gr-osmosdr source blocks are also capped at 1.25MHz
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[20:28] <distrtedpuppy> hello?
[20:28] <distrtedpuppy> Ive come across an old Lockheed diagram & Im looking to find more information about it
[20:28] <distrtedpuppy> Titled Geometric and Dynamic Properties of Ideal Trajectories
[20:29] <distrtedpuppy> its by G.B Dirksen of the Satellite Systems Planning, and is dated Janurary, 1960
[20:29] <R34lB0rg> distrtedpuppy, try http://ntrs.nasa.gov/
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[20:33] <distrtedpuppy> R34lBOrg: thanks  no luck there
[20:34] <distrtedpuppy> Perhaps I can dive into the references of the pre-1965 articles and see if Dirksen pops up
[20:34] <distrtedpuppy> cant seem to find any info anywhere else
[20:39] <Vaizki> fsphil: ah found one limitation.. the pitaya inputs are 1Mohm...
[20:39] <eroomde> distrtedpuppy: do you have a copy of it?
[20:40] <distrtedpuppy> hanging up on my wall
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[20:44] <distrtedpuppy> eroomde: http://ibin.com/2WBSOSRHulMp
[20:44] <distrtedpuppy> scratch that
[20:45] <distrtedpuppy> http://ibin.co/2WBSOSRHulMp
[20:45] <eroomde> what sort of additional information are you looking to glean?
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[20:49] <distrtedpuppy> really just trying to see if there are any publications by Dirksen or his colleagues
[20:50] <distrtedpuppy> this was early enough that I think it was used for the Atlas missions
[20:50] <distrtedpuppy> I think maybe STS-1
[20:51] <distrtedpuppy> I just cant seem to find out who D.B. Dirksen was
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[23:01] <SpacenearUS> New vehicle on the map: 03DK6GB _chase - 12http://tracker.habhub.org/#!qm=All&q=DK6GB%20_chase
[23:03] Nick change: mattbrej1a -> mattbrejza
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[23:58] <SpacenearUS> New vehicle on the map: 03EW1ADX_chase - 12http://tracker.habhub.org/#!qm=All&q=EW1ADX_chase
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[00:00] --- Mon Feb 8 2016