highaltitude.log.20151101

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[00:20] <Laurenceb_> yeah people often get confused by this
[00:21] <Laurenceb_> spread spectrum techniques dont actually make the "real" channel wider in the Shannon capacity sense
[00:21] <chris_99> from what i've just read, it looks to me, CSS supports 2 symbols, unless i'm misunderstanding it
[00:21] <Laurenceb_> nary-MFSK does
[00:21] <Laurenceb_> and something like PSK with lots of FEC does too
[00:22] <Laurenceb_> so a near optimal link for HAB would probably look like ~10kbps BPSK with a load of FEC
[00:22] <Laurenceb_> that would give you a few kbps of throughput
[00:23] <chris_99> interesting
[00:24] <chris_99> do you think im right in thinking it only supports 2 symbols
[00:24] <Laurenceb_> dunno
[00:24] <Laurenceb_> there is an opensource LORA SDR decoder on github
[00:24] <Laurenceb_> somewhere...
[00:25] <chris_99> i was just linked to http://lists.gnu.org/archive/html/discuss-gnuradio/2015-10/msg00291.html which is rather interesting
[00:25] <Miek> https://github.com/hexameron/rtl-sdrangelove/tree/master/plugins/channel/lora
[00:25] <Laurenceb_> ah yeah there is it
[00:25] <Laurenceb_> Dr Rangelove
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[00:29] <Laurenceb_> ah so it measures up or down chirp then decodes in rather standard spread spectrum style
[00:30] <chris_99> i'm curious how it compares to 4-FSK or something
[00:30] <Laurenceb_> well the chirp stuff wont buy you anything
[00:31] <Laurenceb_> I imagine its similar to something midway between 2FSK and BPSK
[00:31] <chris_99> ah, what's the magic then, the datarate?
[00:31] <Laurenceb_> BER curve wise
[00:31] <Laurenceb_> there is FEC and there is a proper optimal modem
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[00:31] <Laurenceb_> also the chrip decoder allows very good pull in with xtal error
[00:32] <Laurenceb_> but if you look at 200bps throughput and compare to silabs with a proper AFC implementation then its almost equivalent
[00:32] <Laurenceb_> but below 200bps it gains over silabs as the silabs filtering cant go narrow enough
[00:33] <chris_99> sorry whatcha mean by silabs?
[00:33] <Laurenceb_> there is nothing amazing about LORA that cant be done with a normal 2FSK system using good AFC
[00:33] <Laurenceb_> si446x
[00:33] <Laurenceb_> I get -136dBm sensitivity with si446x at 200bps
[00:33] <chris_99> ah gotcha, AFC=?
[00:33] <Laurenceb_> automatic frequency control
[00:34] <Laurenceb_> so I pull in to the packet header frequency
[00:34] <Laurenceb_> using a ~1khz filter
[00:34] <Laurenceb_> then go to <400hz for the packet decode
[00:36] <Laurenceb_> if I tried to go really narrow bandwidth with silabs i wouldnt be able to narrow it up enough
[00:36] <Laurenceb_> thats the main place LORA wins
[00:37] <chris_99> ah i think i get you
[00:38] <Laurenceb_> itd also be possible to add FEC to silabs, but CRC is good enough. With HAB you have multiple listeners so there is a bit less gain from FEC
[00:38] <Laurenceb_> the chirp is a distraction, it is not "real" extra bandwidth
[00:38] <Laurenceb_> https://en.wikipedia.org/wiki/Channel_capacity#AWGN_channel
[00:39] <Laurenceb_> logarithmic in power and approximately linear in bandwidth
[00:39] <Laurenceb_> but that bandwidth is almost irrelevant
[00:39] <Laurenceb_> its about twice the bitrate for LORA and around the bitrate for silabs and 2FSK
[00:39] <Laurenceb_> so there is only a little difference there
[00:40] <chris_99> i just noticed, the silabs can transmit up to 1Mbps which seems pretty suprising
[00:40] <Laurenceb_> but if the modem front end bandwidth is excessively wide you lose a load of performance
[00:40] <Laurenceb_> thats where silabs really loses at <200bps
[00:40] <Laurenceb_> nothing to do with Shannon
[00:41] <chris_99> gotcha
[00:43] <chris_99> how could you determine the max bit rate you could get from a silabs, via a HAB, i was thinking you could get the HAB to listen if you've correctly recieved something, letting you control the datarate
[00:44] <Laurenceb_> already done it
[00:44] <chris_99> oh cool :) using that method?
[00:45] <Laurenceb_> https://github.com/Laurenceb/STM32_Launcher/tree/master/Silabs
[00:45] <Laurenceb_> kind of
[00:45] <chris_99> oh you're using an stm32, neat :)
[00:47] <chris_99> so what max datarate did you hit?
[00:47] <Laurenceb_> I only ran 200bps
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[00:49] <chris_99> did you use one of the Chinese modules, or the chip itself, and then added the xtal etc. yourself?
[00:49] <Laurenceb_> chip itself
[00:49] <chris_99> cool
[00:52] <chris_99> i think i'm gonna order some of the modules to play with now, thanks for the info on lora! toodles
[00:52] <Laurenceb_> with TCXO
[00:52] <Laurenceb_> cya
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[07:56] <PE2BZ> !flights
[07:56] <SpacenearUS> 03PE2BZ: Current flights: 03Chetflight3 10(f44e)
[07:56] <PE2BZ> !payload f44e
[07:56] <SpacenearUS> 03PE2BZ: Payload 03CITA 10(f44e) 03$$CITA - 03434.45 MHz USB 03RTTY 50/850Hz ASCII-7 none 2
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[08:13] <SM0ULC-Reb> morrn
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[10:23] <SpacenearUS> New position from 03CITA after 0318 hours silence - 12http://tracker.habhub.org/#!qm=All&q=CITA
[10:23] <Chetic> filling up the balloon :D
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[10:39] <fsphil> new gps antenna?
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[10:41] <Chetic> launch aborted - not enough helium in the tank
[10:42] <chris_99> :(
[10:42] <chris_99> that sucks
[10:42] <daveake> cylinder not filled properly?
[10:43] <SA6BSS> darn!
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[10:50] <Chetic> exactly daveake
[10:51] <Chetic> faar from full
[10:52] <daveake> what capacity is it and how much did you need ?
[10:54] <Chetic> 10L 200bar
[10:54] <Chetic> all of it
[10:56] <Upu> Chetic
[10:56] <Upu> what was hyour order number ?
[10:56] <Upu> or have you sorted it ?
[10:57] <Chetic> driving atm :p
[10:57] <Upu> lol
[10:57] <Chetic> its sorted
[10:57] <Upu> ok cool
[10:57] <Chetic> thx
[10:57] <Upu> drive
[11:00] <daveake> OK that's about 1.8 cubic metres, if my calc is right
[11:00] <daveake> So that's a pretty small cylinder
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[11:16] <michal_f> !flights
[11:16] <SpacenearUS> 03michal_f: Current flights: 03Chetflight3 10(f44e)
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[12:26] <arjunnaha> Just quickly, I paid for a 5.21m3 tank and got a 20L tank, does that add up?
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[12:29] <Oddstr13> 1L = 10cm3
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[12:31] <arjunnaha> with regards to above conversation, how can 10L be 1.8m3?
[12:33] <SpacenearUS> New vehicle on the map: 03DL1NBR-12 - 12http://tracker.habhub.org/#!qm=All&q=DL1NBR-12
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[12:45] <mfa298> arjunnaha: the other critical bit of information there is likely 200bar.
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[12:54] <arjunnaha> mfa298: It's 300bar
[12:57] <mfa298> that's not what was said earlier
[12:57] <mfa298> 10:54 < Chetic> 10L 200bar
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[12:59] <arjunnaha> Sorry, I can't understand this. Is there a formula of sorts to convert gas measurements?
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[13:02] <mfa298> the 10L number will be the space it's using when compressed. Uncompressed it will use more space which I think is where daveake's 1.8m^3 comes from
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[13:02] <mfa298> there's probably a couple of formulae you need to get from the initial numbers to the 1.8m^3
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[13:08] <arjunnaha> Ah, that makes sense
[13:10] <arjunnaha> I think it's Boyle's Law
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[13:29] <SpacenearUS> New vehicle on the map: 03DC2EH-11 - 12http://tracker.habhub.org/#!qm=All&q=DC2EH-11
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[14:44] <Flippylosaurus> any HAB's coming up near the Netherlands?
[14:45] <Flippylosaurus> - or, is there any way to see upcoming launches
[14:48] <mfa298> Flippylosaurus: most flights are announced on the mailing list and may also appear on the calendar (depending on when the flight doc is requested and approved)
[14:48] <mfa298> https://groups.google.com/forum/#!forum/ukhas
[14:49] <mfa298> ical feed http://habitat.habhub.org/calendar/
[14:57] <Flippylosaurus> k, thanks.
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[15:10] <SpacenearUS> New vehicle on the map: 03BENNY_1 - 12http://tracker.habhub.org/#!qm=All&q=BENNY_1
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[15:27] <SpacenearUS> New vehicle on the map: 03VA6BER-11 - 12http://tracker.habhub.org/#!qm=All&q=VA6BER-11
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[15:50] <fsphil> anyone catch the fireball last night? https://www.youtube.com/watch?v=7xaaxz0yWnE
[15:50] <fsphil> seems to have been visible from poland and germany
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[16:40] <daveake> Woo LORA1 has been found
[16:40] <Geoff-G8DHE-Lap> Ohh anywhere close to where it appeared to land ?
[16:41] <daveake> yup
[16:41] <daveake> Strange there was no signal when I went
[16:41] <daveake> also that I couldn't see it
[16:41] <Geoff-G8DHE-Lap> Odd!
[16:41] <daveake> very
[16:41] <daveake> anyway it's being posted back
[16:41] <Geoff-G8DHE-Lap> Ah so no verification!
[16:42] <daveake> All I know is "we found it in one of our fields"
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[16:42] <Geoff-G8DHE-Lap> Ah well. starnger things have happened!
[16:42] <Geoff-G8DHE-Lap> stranger
[16:49] <daveake> It might just be the battery didn't last quite as long as the other 2, and it was hiding behind a sheep
[16:52] <daveake> Only the 2nd time I've had someone find a payload for me
[16:53] <daveake> Other time was one that landed in front of someone :p
[16:56] <Geoff-G8DHE-Lap> Ah yes, it reappered when he opened the boot and took it out!
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[16:57] <daveake> No, that one he drove off straightaway
[16:57] <daveake> Then put it in his garage
[16:57] <daveake> We got the signal when we caught up with him
[16:57] <daveake> Including black SSDV pix of the inside of his garage
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[17:06] <fsphil> so now you can .. repeat .. the flight
[17:06] Action: fsphil lets himself out
[17:07] <TIBS01> any balloons flying in the uk ?
[17:07] <fsphil> not right now
[17:07] <TIBS01> boohoo
[17:07] <TIBS01> go and launch some :)
[17:08] <fsphil> I've got one ready...
[17:08] <TIBS01> where you launching them from ?
[17:08] <fsphil> but have to wait for other stuff first :)
[17:08] <TIBS01> gps boards etc ?
[17:08] <fsphil> I'm rewriting the software a bit
[17:09] <TIBS01> ahh
[17:09] <TIBS01> linux software ? or raspberry pi u chucking in with it
[17:09] <fsphil> the met office launch some at 11pm if you really want to track something :)
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[17:09] <fsphil> yeah my next one will have a pi
[17:09] <TIBS01> ahhh i have 3 of them
[17:09] <chris_99> can you decode met office balloons easily?
[17:10] <TIBS01> depends if they run aprs ?
[17:10] <fsphil> yeah. FM receiver that covers 401-405 MHz, and some software called sondemonitor
[17:10] <chris_99> ah neat
[17:10] <TIBS01> ahh
[17:10] <Geoff-G8DHE-Lap> http://www.coaa.co.uk/sondemonitor.htm
[17:10] <TIBS01> stick some porn mags in with it hopefully whoever picks it up will enjoy they got it lol
[17:12] Action: Laurenceb_ wonders about introducing a pronboard composite
[17:12] <Laurenceb_> laminated porno mags
[17:12] <TIBS01> LOL
[17:12] <TIBS01> yer or have a mini lcd monitor with women scrolling across it lol
[17:12] <TIBS01> running from the pi lol
[17:13] <chris_99> Laurenceb_, out of interest did you use 4-FSK with your silicon labs chip?
[17:14] <Laurenceb_> no
[17:14] <Laurenceb_> in theory it would give a slight performance boost
[17:14] <Laurenceb_> but from the silabs specs it appears their modem implementation isnt so good
[17:14] <TIBS01> do any of the balloons run aprs or they just run a tracker for the site ?
[17:14] <Laurenceb_> so you maybe lose a dB
[17:14] <Laurenceb_> thats why I didnt bother
[17:14] <chris_99> ah interesting
[17:15] <fsphil> UK flights can't use amateur radio frequencies
[17:15] <TIBS01> they have used 70cms in the past
[17:15] <TIBS01> because there low freq transmitters
[17:15] <murb> fsphil: unless they're in space!
[17:15] <Laurenceb_> chirs_99: what are you planning?
[17:15] <fsphil> the license-exempt part of 70cm yeah
[17:15] <chris_99> oh also, i was wondering, is it possible to bypass it's packetisation stuff, and just send raw FSK data, and do the packetisation etc. yourself
[17:15] <TIBS01> true
[17:15] <fsphil> but there's really no point on using APRS there, nobody's listening
[17:15] <Laurenceb_> chris_99: sure, you can use raw mode
[17:16] <Laurenceb_> I use it to send RTTY in my code
[17:16] <chris_99> ah sweet
[17:16] <fsphil> APRS's only one single plus is the existing receiver network
[17:16] <TIBS01> why dont u launch a balloon running like wspr
[17:16] <fsphil> everything else about APRS is awful
[17:16] <Laurenceb_> heh 2 true fsphil
[17:16] <TIBS01> or cw beacon
[17:16] <Laurenceb_> yeah someone needs to trythat
[17:16] <fsphil> CW? let a machine decode it :)
[17:16] <Laurenceb_> CW with multiple listeners
[17:17] <Laurenceb_> that would be fun
[17:17] <chris_99> Laurenceb_, one other thing, did you use 868MHz @ 500mW, or the ~400MHz frequency?
[17:17] <fsphil> don't involve humans
[17:17] <Laurenceb_> chris_99: 434
[17:17] <fsphil> wspr would be neat, but the long antenna is a concern
[17:17] <chris_99> aha, i was thinking of getting the 868MHz for the high power
[17:18] <fsphil> there are license-exempt HF frequencies so it would be possible -- but same flaw as APRS, few receivers on the non-amateur frequency
[17:18] <Laurenceb_> chris_99: what are you trying to do?
[17:18] <Ian_> offset by the greater path losses
[17:18] <TIBS01> do it on 446
[17:18] <TIBS01> thats license exempt
[17:18] <fsphil> voice only iirc
[17:18] <chris_99> not sure yet, launch a HAB at some point, i've only got a H2 reg thus far though heh, so i've got a lot of electronics to sort out
[17:22] <chris_99> i wouldn't mind playing with different data rates, to see whats the max you could hit, possibly by just cycling through them
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[17:22] <amell> adamgreig: the RSPB will be onto you... http://i.imgur.com/fVUPEe9.png
[17:23] <Ian_> Another aviator not checking their NOTAMs
[17:24] Nick change: fl_0|afk -> fl_0
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[18:21] <Laurenceb_> typical irc lair
[18:21] <Laurenceb_> http://www.eevblog.com/forum/chat/whats-your-work-benchlab-look-like-post-some-pictures-of-your-lab/?action=dlattach;attach=149162;image
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[18:22] <eroomde> hello, I'm from the internet
[18:22] <Lunar_Lander> hello
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[18:43] <fab4space> hi
[18:57] <fsphil> ok I feel better about my untidy desk now. it's rather well organised compared to that
[18:59] <chris_99> haha
[19:00] <Lunar_Lander> nice :D
[19:00] Nick change: fl_0 -> fl_0|afk
[19:01] <chris_99> theres nowhere to even put your feet in that image
[19:04] <fsphil> the chair is just for decoration
[19:04] <chris_99> heh
[19:06] <Lunar_Lander> XD that photo
[19:06] <Laurenceb_> any freecad users here?
[19:07] <Lunar_Lander> tbh how can one work in there?
[19:10] Action: Laurenceb_ wants to import a gerber into freecad
[19:10] <Laurenceb_> its not going well :-/
[19:12] Action: LazyLeopard has seen worse...
[19:12] <Lunar_Lander> oh ok
[19:13] <LazyLeopard> ...though, TBH, the only way of dealing with that worse case was whith a skip and a shovel...
[19:17] <Laurenceb_> nvm fixed it - turns out there is an eagle ULP to do what I want
[19:17] <Laurenceb_> eagle ULPs are pretty useful
[19:18] <chris_99> ULP?
[19:18] <Laurenceb_> user language program
[19:18] <Laurenceb_> little macro thingies
[19:19] <chris_99> ah interesting, didn't know eagle had macros
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[19:41] <chris_99> anyone used http://www.waveshare.com/OV2640-Camera-Board.htm i notice, it's got code for STM32F429
[19:42] <Laurenceb_> theres nots of helpful things hiding in eagle macros
[19:42] <Laurenceb_> yeah an F4 based SSDV would be nice
[19:42] <Laurenceb_> unfortunately F4 camera interface is a bit slow
[19:42] <chris_99> i'm not sure it actually uses the camera interface
[19:42] <Laurenceb_> well - a few % slower than Rpi in terms of pixels/second
[19:43] <Laurenceb_> but there is F7 not, I need to look at the specs
[19:43] <Laurenceb_> itd be nice to have an opensource high speed camera
[19:43] <chris_99> the F7 disco looks cool, but it's not cheap
[19:48] <fab4space> Laurenceb, chris_99 I have bougth the ALCAM OEM board based on STM32F407
[19:48] <Laurenceb_> googling
[19:48] <chris_99> oh let me have a looky
[19:49] <fab4space> it includes a https://www.kickstarter.com/projects/1359959821/alcam-oem/description
[19:49] <Laurenceb_> looks nice
[19:49] <fab4space> OV3640 3MP Image Sensor
[19:49] <fab4space> that 's a niece piece of hardware
[19:49] <Laurenceb_> nice and simple
[19:49] <Laurenceb_> I like it
[19:50] <fab4space> and my goal was to interface it to a radio module using SPI and send SSDV images with a lightweight HAB
[19:50] <fab4space> I have the 1.5 hardware version
[19:50] <fab4space> unfortunately it is not an open source project yet...
[19:50] <Laurenceb_> but only 30fps :-/
[19:50] <fab4space> my goal was to modify the firmware to interface it with a radio module
[19:50] <chris_99> ah pity that its not OSS
[19:50] <fab4space> but the firmware is closed
[19:51] <fab4space> I have asked them several times eitheir to open the firmware source or to provide a library with API
[19:51] <fab4space> so that we can customise the end user application
[19:51] Action: Laurenceb_ was after something to rival GoPro3
[19:51] <fab4space> it is here sitting on my desk waiting for the source to be opened :)
[19:51] <Laurenceb_> 240fps at VGA res
[19:52] <fab4space> I may still include it in my next hab launch to check the quality of pictures in hab environment (auto exposure, ...)
[19:53] <fab4space> there is still the possibility to use their hardware and start from scratch to rewrite another firmware for it
[19:53] <fab4space> but it may take a long time :)
[19:53] <chris_99> Laurenceb_, well http://nofilmschool.com/2015/03/xiaomi-yi-action-camera-china-gopro-hero-price-cost looks rather intriguing
[19:53] <chris_99> if it is actually that price
[19:56] <chris_99> looks like you can get it for ~£47
[19:56] <Laurenceb_> only 120fps
[19:57] <chris_99> 240fps @ 480p
[19:57] <fab4space> and my ultimate goal would be to build a PocketQube with this kind of board :)
[19:57] <Laurenceb_> http://i.imgur.com/IEJtwyn.gifv
[20:00] Nick change: fl_0|afk -> fl_0
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[20:05] <Lunar_Lander> ohh gps jammer galore
[20:05] <Lunar_Lander> (:D)
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[20:56] <SpacenearUS> New vehicle on the map: 03BGE_chase - 12http://tracker.habhub.org/#!qm=All&q=BGE_chase
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[21:20] <chris_99> does anyone know the highest baud rate, used on HABs in the UK is?
[21:21] <Geoff-G8DHE> 600baud is used for SSDV but that also runs FEC
[21:21] <Geoff-G8DHE> Some of the LoRa modes are faster, but again FEC
[21:22] <daveake> Tim in NL had some success with 1200 baud RTTY
[21:22] <chris_99> wow neat :)
[21:22] <daveake> I don't remember any UK flights > 600 baud
[21:22] <chris_99> was that using 2-FSK?
[21:22] <daveake> (rtty that is)
[21:24] <daveake> http://www.timzaman.nl/?page_id=1106
[21:24] <chris_99> cheers
[21:24] <daveake> Yeah standard stuff
[21:25] <chris_99> i'm confused in the image it says 0.12kbps and in the text 1200bits/s
[21:25] <daveake> definitely 1200 baud
[21:26] <chris_99> cool
[21:26] <daveake> LoRa is probably a safer option - it'll throughput equiv to rtty 1400 baud easily
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[21:27] <daveake> I did a dual 600 baud rtty flight once http://www.daveakerman.com/?p=1005
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[21:29] <chris_99> neat :)
[21:30] <chris_99> i'm quite interested in the silabs chip, looking into the 868MHz one atm, i'd be curious about trying 4-FSK
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[21:33] <mfa298> chris_99: is there a particular reason you seem determined to use 868MHz when almost everyone else in the UK goes for 434MHz
[21:34] <chris_99> not really, i could use the ~400MHz one, but the power output seems nice
[21:34] <Geoff-G8DHE> Your problem will be that there are only a couple of stations geared up to receieve 686MHz, so if you miss any data yourself .....
[21:34] <mfa298> but with the higher power I think you hit duty cycle limits and probably also fewer people able to listen
[21:35] <Geoff-G8DHE> 868Mhz
[21:36] <Geoff-G8DHE> Another factor might be temperarure stability, with only 10% time on you may find they drift as well.
[21:36] <chris_99> ah, what do most people tend to listen with? i was thinking most radios would support 868
[21:36] <Geoff-G8DHE> Which radios support 868MHz ? Its not an Amateur band so very few....
[21:37] <jarod> Geoff-G8DHE: https://www.youtube.com/watch?v=PCSNCs7bwCw you ever watched this?
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[21:37] <Geoff-G8DHE> Vaguely remember it why ?
[21:37] <mfa298> if it's lora they're using dedicated lora modules which will be band specific. With the more traditional modes lots of us use dedicated amateur rigs which do 434 really well but most don't do 868
[21:37] <jarod> uhm... you would remember it
[21:38] <jarod> Geoff-G8DHE: https://youtu.be/PCSNCs7bwCw?t=290
[21:39] <chris_99> ah, i was thinking of scanners/rtlsdr's
[21:41] <jarod> guess Geoff fell off this chair
[21:42] <Geoff-G8DHE> well not really, another boring car program, the name is quite common over here as well!
[21:42] <jarod> Oh come on.... nm then
[21:42] <jarod> jesus
[21:42] <jarod> fucking people these days.... laters o/
[21:42] <mfa298> chris_99: some of the better sdrs (fcd, airspy, hackrf) might do ok, but the rtlsdr isnt as sensitive, lots of people also have antennas setup for 434, very few will have a 868 antenna up
[21:43] <chris_99> gotcha, ok, i guess i could look at dual transmitters instead
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[21:45] <jcoxon> language jarod please
[21:46] <chris_99> i didn't realise rtlsdr wasn't that sensitive, that's a pain, (i've only used a scanner before for tracking)
[21:47] Nick change: fl_0 -> fl_0|afk
[21:47] <Geoff-G8DHE> There not that bad, but I haven't an aerial up for 868MHz, its not going to work very well on any of my existing aerials either, and there only seem to be a coiuple of beams around so probably make my own if needed.
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[21:48] <chris_99> can you use a discone antenna for HAB stuff, or would that not work?
[21:48] <Geoff-G8DHE> very low gain if you can call it gain ..
[21:48] <chris_99> heh
[21:48] <mfa298> It would certainly be interesting to have some more flights using 868 as a test to see how it does, but you probably want 434 as well.
[21:49] <chris_99> mmm
[21:50] <mfa298> There was one a couple of years ago on 868, but it didn't get many listeners (possibly as there were fewer sdr users) and I think the person doing it decided for continuous tx he could only use 5mW
[21:50] <daveake> yeah if you're experimenting it's good to have a standard reliable 434 tracker on their too
[21:50] <chris_99> the silabs one, would be fine at 433 right?
[21:51] <daveake> I did a lora one on 868, using 250kHz and 5mW
[21:51] <daveake> Quite a few lost packets but it was only me receiving
[21:51] <daveake> I have an lora uplink to request re-send of missing packets now, so I should try again
[21:51] <daveake> a
[21:51] <chris_99> oh neat
[21:52] <chris_99> i presume you can tx at like 500mW from the ground to the HAB
[21:52] <dbrooke> I put up a 1/4 wave GP for that 5mW 868 flight but only got partials the whole flight whereas my 434 setup with a colinear performs quite well (same rx, IC-R9000)
[21:52] <dbrooke> s/9000/7000/
[21:52] <daveake> You could use a different bandwidth/power/DC combo for uplink, yes
[21:53] <daveake> I don't currently but that would be worthwhile if using high bandwidth for the downlink
[21:53] <daveake> On 434 remember that, with a licence, you can uplink a lot more
[21:53] <daveake> (power)
[21:54] <chris_99> ah, how much can you transmit if you have a licence?
[21:54] <daveake> You'd think I'd know that :p
[21:54] <chris_99> heh
[21:54] <daveake> 400W probably
[21:55] <chris_99> wow!
[21:55] <daveake> I built a LoRa + 7W PA
[21:55] <mfa298> chris_99: depends on the license, and probably shouldn't be abused as it's potentially a legal grey area
[21:55] <Geoff-G8DHE> pep
[21:55] <daveake> But with LoRa both Matt and I have had uplinks from the ground at 10mW
[21:56] <fab4space> 120W in france chris_99
[21:56] <chris_99> what kind of antenna do you use for transmitting?
[21:56] <Geoff-G8DHE> same as you use for receiving!
[21:56] <daveake> On mine it was 3 balloons, each with the usual 1/4 wave + ground plane
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[21:57] <chris_99> gotcha
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[22:06] <Ian_> Max 400W in UK with a full licence
[22:06] <Ian_> Subject to a few geographical restrictions
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[22:45] <chris_99> just ordered the 433MHz silabs module :)
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[23:06] <SA6BSS> chris_99: if you going for 868 a regulat uhf tv antenna will work well as an rx-antenna
[23:06] <Laurenceb_> Upu: ping
[23:06] <chris_99> SA6BSS, aha that's interesting
[23:09] <gonzo_> as long as it is optimised for that part of the band
[23:09] <gonzo_> better to make ypour own though
[23:11] <Upu> hey Laurenceb
[23:11] <Darkside> https://github.com/mayeranalytics/pySX127x
[23:11] <Darkside> ooh cool
[23:13] <Laurenceb_> hi upu: wondering if you could help
[23:14] <Laurenceb_> I need to run an irc chatbot / logger
[23:14] <Laurenceb_> do you have a server I could run it on?
[23:15] <Upu> generally they are run on Tiamat or Kraken
[23:15] <Upu> whats it for ?
[23:16] <Upu> is it related to this sort of thing ?
[23:16] <Laurenceb_> yes
[23:16] <Laurenceb_> lol I havent followed any of the developments re servers
[23:16] <Laurenceb_> Ktaken rings a bell
[23:16] <Laurenceb_> *Kraken
[23:16] <Upu> have a chat on habhub
[23:16] <Upu> I just supply the hardware and the internetty bit
[23:18] <Laurenceb_> ok cool
[23:18] <Laurenceb_> thanks
[23:19] <Laurenceb_> theres no rush - my existing setup is running for a few more weeks
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[00:00] --- Mon Nov 2 2015