highaltitude.log.20160725

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[03:59] <SpacenearUS> New position from 03OM3BC-13 after 037 hours silence - 12https://tracker.habhub.org/#!qm=All&q=OM3BC-13
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[05:07] <SpacenearUS> New position from 03S-15 after 0311 hours silence - 12https://tracker.habhub.org/#!qm=All&q=S-15
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[06:28] <SpacenearUS> New vehicle on the map: 03OM3KKF-11 - 12https://tracker.habhub.org/#!qm=All&q=OM3KKF-11
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[06:50] <SpacenearUS> New position from 03SP5RZP-11 after 032 days silence - 12https://tracker.habhub.org/#!qm=All&q=SP5RZP-11
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[07:05] <SpacenearUS> New vehicle on the map: 03OM3KKF-9 - 12https://tracker.habhub.org/#!qm=All&q=OM3KKF-9
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[07:24] <AndyEsser> morning
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[07:46] <number10> morning
[07:49] <SpacenearUS> New vehicle on the map: 03PISKY4 - 12https://tracker.habhub.org/#!qm=All&q=PISKY4
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[07:55] <SpacenearUS> New vehicle on the map: 03PISKY5 - 12https://tracker.habhub.org/#!qm=All&q=PISKY5
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[08:07] <SpacenearUS> New vehicle on the map: 03PISKY6 - 12https://tracker.habhub.org/#!qm=All&q=PISKY6
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[09:39] <SpacenearUS> New vehicle on the map: 03MM8 - 12https://tracker.habhub.org/#!qm=All&q=MM8
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[10:15] <SpacenearUS> New vehicle on the map: 03LCARS_chase - 12https://tracker.habhub.org/#!qm=All&q=LCARS_chase
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[10:23] <samir_> Hi is there anyone here who can offer advice on using Habitat?
[10:42] <daveake> Just ask; it'll depend on the question on who's around
[10:42] <daveake> and
[10:43] <samir_> ok - there seems to be multiple instances of my payload / flight in Habitat - is this a problem? Also I'm trying to get the flight data submitted in Habhub, but getting a response from a bot.
[10:44] <daveake> Multiple payload ocs isn't a problem; in the absence of a live flight doc it'll use the latest
[10:45] <daveake> So check that you're uploading OK to the map (so you know that the latest payload doc is correct)
[10:45] <daveake> Then be careful to reference that payload doc in your flight doc
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[10:53] <samir_> ok thanks will have a play.
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[11:07] <SpacenearUS> New position from 03IV3SRD-11 after 038 hours silence - 12https://tracker.habhub.org/#!qm=All&q=IV3SRD-11
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[11:09] <pb0ahx> !flights
[11:09] <SpacenearUS> 03pb0ahx: Current flights: 03PICO-25 144.251 MHz CTSTIA32/1000 10(0b32)
[11:09] <pb0ahx> gm all
[11:14] <Ian_> Good afternoon pb0ahx
[11:14] <pb0ahx> hi
[11:14] <pb0ahx> any flight today ??
[11:14] <SpacenearUS> New position from 03VE2WMG-11 after 0311 days silence - 12https://tracker.habhub.org/#!qm=All&q=VE2WMG-11
[11:17] <Ian_> It doesn't look like it. daveake was testing PISKY4, PISKY5 and PISKY6 earlier ahead of tomorrows flight from Elsworth, Cambridgeshire, details in the mailing list https://groups.google.com/forum/?fromgroups#!topic/ukhas/q0W1bEgTUK8
[11:18] <Ian_> with RTTY and LoRa on 70cm plus 869.850MHz tomorrow
[11:18] <Ian_> Feed your beam antenna with data
[11:19] <daveake> Steve may fly something too
[11:20] <Ian_> It's a bit like bears and woods really.
[11:21] <swaledale> three at once eh daveake, guessing skycademy testing or zero stuff?
[11:21] <daveake> 1 tracker
[11:21] <pb0ahx> ok than i have time to put a other antenne in the tower
[11:22] <swaledale> RTTY, LoRa + 869 = The Works :)
[11:22] <gonzo__> pjm will probably be pleased to hear that.
[11:23] <daveake> :)
[11:23] <swaledale> with ssdv?
[11:23] <daveake> yup
[11:23] <Ian_> Do you find that RNLAF jets use your tower as a turning point - significant navigational landmark
[11:23] <daveake> If you're not on the mailing list, do join it
[11:23] <Ian_> pb0ahx
[11:23] <daveake> As all the details were posted there
[11:24] <swaledale> Well, I was, but for some reason havent had any lately :/ best check that out
[11:30] <swaledale> how odd, missed the last lot, left and rejoined lets see if that sorts it
[11:42] <pjm> ah is there a lora flight?!
[11:43] <daveake> yup
[11:47] <swaledale> might have to look into doing some 869 then. need to look at antennas
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[12:24] <fsphil> yes they work better if you watch them
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[12:24] <Vaizki> men who stare at antennae
[12:26] <AndyEsser> I'd totally watch that
[12:26] <fsphil> even better if you give them a little wave
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[12:27] <AndyEsser> fsphil: that was terrible...
[12:32] <gonzo__> the lengths some people will go to
[12:34] <Ian_> pb0ahx how much steering do you need to do when covering UK HAB flights, none after setup/acquisition or some?
[12:34] <Ian_> Antenna of course!
[12:38] <pb0ahx> Ian_, I do not know what you meant by steering my antennas
[12:38] <pb0ahx> I use here normally 19 ele tonna to 70cm 23 meters high from the street and direction usually at 270 degrees
[12:39] <pb0ahx> Ian_, u can see my set up on http://www.pb0ahx.nl
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[12:39] <number10> what sort of wave fsphil, 1/4
[12:42] <Ian_> pb0ahx I meant that during UK HAB flights, given your range, do you need to adjust the azimuth at all?
[12:42] <gonzo__> I'm not standing for that!
[12:43] <pb0ahx> i use habrotate prg to steering my rotators automatic
[12:43] <fsphil> random question, any of the geostationary weather satellites still send analogue data?
[12:43] <pb0ahx> also elevation aotomatic
[12:44] <Ian_> Ah OK, I was wondering if it required to adjust during the flight. Possibly more in elevation than in azimuth.
[12:45] <pb0ahx> Ian_, most of hab is no or max 3 deg elevation
[12:47] <Ian_> That's the info I was looking for, many thanks
[12:47] <pb0ahx> ok ur welcome
[12:48] <pb0ahx> my engels is not so good for fast translating in my head
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[12:49] <pb0ahx> i must reed it 2x for i understand
[12:49] <pb0ahx> some day[ 4x hiohihi fun
[12:50] <Ian_> I understand, I have no Dutch, so I am grateful for your language skills, as is the HAB community for your fantastic antenna support
[12:53] <pb0ahx> Ian_, I find those hab fun to do because then the reception of small signals can optimize your antennas and preams I also have some for the reception of satellite
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[12:56] <Ian_> More AZ/EL activity for the satellites
[12:56] <pb0ahx> yep
[12:56] <pb0ahx> I am now retired and was therefore time since December for a hobby
[12:57] <SpacenearUS> New position from 03WB8MSJ-12 after 0314 hours silence - 12https://tracker.habhub.org/#!qm=All&q=WB8MSJ-12
[12:57] <Ian_> Also retired but keep bees and help a bee farmer and waste a lot of time
[12:58] <AndyEsser> is not retired, nor has bees
[12:59] <Ian_> I crave the female company AndyEsser.
[12:59] <pb0ahx> AndyEsser, your time comes naturally
[13:01] <gonzo__> I thought all bees 9apart from the queen) were male?
[13:02] <AndyEsser> pb0ahx: if I get that far :P
[13:02] <AndyEsser> Ian_: there are websites for that
[13:02] <Ian_> Only the drones are male and they get the boot in the autumn
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[13:03] <Ian_> You wouldn't believe how short the cropping season is
[13:04] <Ian_> Working like demons today, all over in under two weeks for practical purposes.
[13:04] <Ian_> I am harvesting in ten days time
[13:05] <Ian_> It's my exercise regime. Heavy work a lot of the time.
[13:08] <AndyEsser> python peeps
[13:08] <AndyEsser> days = {some array of data}
[13:08] <AndyEsser> for x in range (0, 6):
[13:08] <AndyEsser> value = timedelta(days=x)
[13:09] <AndyEsser> what on earth is that 'days=x' bit ?
[13:10] <SpeedEvil> I would guess it calls timedelta with successive elements of days
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[13:14] <SpacenearUS> New position from 03K6RPT-12 after 039 hours silence - 12https://tracker.habhub.org/#!qm=All&q=K6RPT-12
[13:15] <AndyEsser> apparently days=x is setting a named parameter passed to timedelta
[13:17] <SpeedEvil> ah
[13:17] <AndyEsser> silly language
[13:17] <AndyEsser> :P
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[14:32] <daveake> Anyone set up for 868 lora who isn't far from Elsworth? Say < 50 miles?
[14:32] <dbrooke> probably
[14:33] Action: fsphil counts on fingers.... hmm, no
[14:33] <dbrooke> I now have a better antenna than before but haven't tested the new gateway
[14:34] <fsphil> is the lora the faster mode?
[14:34] <daveake> Fancy having a go at uploading ?
[14:34] <fsphil> I might head up the hill and have a listen
[14:34] <daveake> fsphil It's fast but not the fastest
[14:34] <fsphil> worth a try
[14:34] <daveake> Can double it and that's it
[14:35] <fsphil> I'm curious to see if I can see any trace of it on a waterfall
[14:35] <dbrooke> Yes, I can try uploading
[14:35] <daveake> Cheers
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[15:36] <samme> For the External Active Antenna (SMA), what does the 3-5V means?
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[15:43] <dbrooke> samme: it means you need to provide between 3 and 5 volts on the coax to power the amplifier in the antenna
[15:46] <samme> dbrooke: This is the module(https://www.coolcomponents.co.uk/antenna-gps-3v-magnetic-mount-sma.html). But my GPS module uses 5V (GPS module with antenna NEOM6MV2 GY-GPS6MV2)
[15:46] <samme> dbrooke: I intend to link those two using (https://www.adafruit.com/products/851)
[15:47] <samme> will it work?
[15:51] <daveake> First off, if you look at the datasheet for that antenna, it's happy being supplied with 5V. http://php2.twinner.com.tw/files/onshine/ANT555-2006-NEW.pdf
[15:52] <dbrooke> that antenna says 3V, so depends on whether your GPS module supplies 3V on its uFL,
[15:52] <daveake> Second, because your GPS board wants a 5V supply, doesn't mean that it sends 5V to the antenna
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[15:55] <samme> daveake: understood, 2.7-5V. So it is possible, great! :D Thanks
[15:56] <daveake> Which GPS module do you have ?
[15:57] <samme> daveake: http://www.ebay.co.uk/itm/GPS-module-with-antenna-NEOM6MV2-GY-GPS6MV2-for-Arduino-RPI-/172230364395
[15:59] <miek> looks like it's got a regulator on the board to drop down to the 2.7-3.6V that the NEO-6M needs
[16:00] <samme> although according to the description it mentions to do a conversion, then I found out this (https://www.youtube.com/watch?v=09sNLmoJ3HI)
[16:01] <samme> he directly plugs it into 5V
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[16:05] <daveake> Yes that partiocular board is happy with 5V
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[16:05] <daveake> It's still not sending 5V to the antenna (not that it would matter if it was)
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[16:08] <samme> daveake: so the antenna would work fine with Arduino and that particular GPS module?
[16:09] <daveake> I don't know. I don't know if that module sends DC to the antenna. This function is external to the NEO6 so it depends on what's on that board.
[16:09] <daveake> See P49 https://www.u-blox.com/sites/default/files/products/documents/LEA-NEO-MAX-6_HIM_(UBX-14054794).pdf
[16:10] <daveake> Do you have the GPS? If you have that and a meter you could check.
[16:15] <samme> daveake: 3.3V at the ufl
[16:15] <daveake> cool
[16:16] <samme> daveake: so should there be an issue? :S
[16:17] <daveake> I don't think so
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[16:17] <samme> daveake: thanks
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[16:41] <AndyEsser> evening all
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[16:42] <swaledale> evening
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[17:15] <AndyEsser> Anyone in here have any resources for writing low,high,bandpass filters in C/C++ for real-time incoming data in a complex IQ format?
[17:16] <adamgreig> read "understanding digital signal processing" by lyons
[17:17] <AndyEsser> ah yes, forgot we had a DSP guru in here :)
[17:17] <adamgreig> it won't tell you anything about C but it will tell you about DSP and you can figure out the C from that
[17:17] <adamgreig> it is the book to read, in my opinion
[17:17] <AndyEsser> going to force me to understand the maths, aren't you
[17:17] <AndyEsser> :P
[17:17] <adamgreig> you know what they say about engineering without numbers
[17:18] <adamgreig> it will explain complex IQ if you're not totally happy with it already, it will explain what a filter is and how they are implemented
[17:18] <adamgreig> it's a practical book and doing real DSP systems
[17:18] <AndyEsser> cheers
[17:18] <adamgreig> just it assumes you'll figure out the final implementation detail yourself, depending on what language you're using (and often DSP is done in hardware/FPGA/etc so..)
[17:19] <adamgreig> and it has a great final chapter on DSP tricks you'll want to know
[17:19] <AndyEsser> cheers
[17:19] <adamgreig> come back with specific questions :P
[17:19] <AndyEsser> adamgreig: please will you write the C code for a bandpass filter? :P
[17:20] <adamgreig> no
[17:20] <AndyEsser> not quite the sort of question you intended?
[17:20] <adamgreig> next question :P
[17:20] <adamgreig> in all seriousness https://github.com/adamgreig/sdr-rs/blob/master/src/fir.rs
[17:20] <AndyEsser> ha
[17:20] <adamgreig> efficient and fast rust FIR filter with design functions for bandpass filters
[17:20] <AndyEsser> ta
[17:21] <adamgreig> works on real or complex, fixed width or floating point
[17:21] <adamgreig> it's in rust though, so
[17:21] <adamgreig> do you know what an FIR filter is?
[17:21] <AndyEsser> Finite... Response
[17:21] <AndyEsser> as oppose to IIR
[17:21] <adamgreig> a bandpass filter is the same exact code as a lowpass or highpass, you just need a filter, what its frequency response is just comes down to a handful of numbers
[17:21] <adamgreig> implementing a naive FIR in C is very straightforward
[17:22] <AndyEsser> bandpass is a case off chainging a Low and High together?
[17:22] <adamgreig> do that, then use a filter design tool (eg scipy.signal.firwin in python) to get a set of coefficients
[17:22] <adamgreig> no
[17:22] <adamgreig> I mean you could do that but it's very inefficient
[17:22] <AndyEsser> I'd be happy with a first order FIR lowpass filter to start with
[17:22] <adamgreig> you just do a FIR filter with a set of coefficients that makes it bandpass instead of lowpas or highpass
[17:22] <AndyEsser> ah ok
[17:22] <adamgreig> great, write an FIR filter in C
[17:23] <adamgreig> a very simple one, don't do anything stupid to start with
[17:23] <AndyEsser> those coefficients are calculated once when you choose your filter frequencies, rather than each time, yes?
[17:23] <adamgreig> yes
[17:23] <AndyEsser> the coefficients are what actual determines the filters behaviour?
[17:23] <adamgreig> yes
[17:23] <AndyEsser> "anything stupid"?
[17:23] <AndyEsser> haha
[17:23] <adamgreig> do you understand the idea behind digital frequencies rather than actual frequencies?
[17:23] <adamgreig> your filter operates on 0 to 2pi radians/second
[17:23] <AndyEsser> probably not
[17:23] <adamgreig> pi is the highest frequency
[17:24] <adamgreig> it maps exactly to your nyquist frequency
[17:24] <AndyEsser> would it be better to move this to PM to avoid noise in the channel?
[17:24] <adamgreig> everything scales with sample frequency, but after you've sampled it's all done in terms of normalized frequency
[17:24] <adamgreig> no
[17:24] <adamgreig> this way anyone else interested can read as well and it's archived for posterity and it's kind of the point of the channel too
[17:24] <AndyEsser> sure
[17:24] <AndyEsser> :)
[17:25] <adamgreig> https://en.wikipedia.org/wiki/Normalized_frequency_%28unit%29 is that idea
[17:25] <adamgreig> it means your filter might have a cutoff frequency of pi/4
[17:26] <adamgreig> so if you feed it samples at 1k samples/second, it will cut off at 125Hz
[17:26] <adamgreig> but if you fed it samples at 10k samples/second, it cuts off at 1250Hz
[17:26] <AndyEsser> interesting
[17:26] <adamgreig> we consider it to be the same filter at the same frequency etc
[17:27] <adamgreig> anyway I have to run to dinner so can't give a mini dsp lecture right now
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[17:27] <adamgreig> but read that textbook, it will explain it better than I could
[17:28] <adamgreig> then implement an FIR in C, and use Python or an online tool to get some coefficients for a bandpass filter that does what you want
[17:28] <AndyEsser> no problem, thanks for the pointers
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[18:08] <Ian_> I think that I might go for the author's simpler tomb https://www.bookdepository.com/Essential-Guide-Digital-Signal-Processing-Richard-G-Lyons/9780133804423 and see how I do, then see if I can't pick up a second hand copy of the main event at a later date.
[18:10] <Ian_> It's a bit like designing analogue filters etc., but specifying impedances for the various components and by applying the required frequencies arriving at component values.
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[18:11] <Ian_> Or the fact that the Q of a circuit at audio is the same as that at VHF/UHF, which explains why a low IF is used for selectivity while a high IF is used to get rid of the image.
[18:12] <Ian_> Here we are working with Pi instead of impedances . . . :) over simplified, which is what I need.
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[18:37] <SpacenearUS> New vehicle on the map: 03M5 - 12https://tracker.habhub.org/#!qm=All&q=M5
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[19:21] <Ian_> upu Can you confirm customer details didn't make the trip so must reregister on uputronics?
[19:22] <Upu> confirmed
[19:22] <Upu> you've not bought anything from me since March
[19:22] <Upu> I am disappoint
[19:22] <Ian_> I will rectify that
[19:22] <AndyEsser> lol
[19:22] <Ian_> Many thanks
[19:22] Action: AndyEsser hopes Upu doesn't look
[19:23] <Upu> :)
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[19:46] Action: mfa298 reads scrollback, looks up book, fondly remembers when good text books were around £30.
[19:46] <fsphil> upu has a shop?!
[19:49] <lz1dev> bookshop?
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[19:57] Action: Ian_ considers second hand books for the price
[20:05] <AndyEsser> prog:
[20:05] <AndyEsser> prin
[20:05] <AndyEsser> ...
[20:05] <AndyEsser> apologies
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[20:31] Action: Laurenceb hates Qt
[20:31] <Laurenceb> http://i.imgur.com/nUTiuhV.png channel7, thats supposed to be regular
[20:31] <Laurenceb> so much jitter :(
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[21:30] <SpacenearUS> New vehicle on the map: 03JMHS - 12https://tracker.habhub.org/#!qm=All&q=JMHS
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[22:18] <M0rjx> Has anyone replaced the 32 MHz crystal on the hoperf modules with temperature controlled one?
[22:19] <M0rjx> I'm wondering if that will make it more stable at -40
[22:21] <M0rjx> Hum v quiet in here
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[22:22] <craag> Yes people have done on the rfm22 M0rjx
[22:24] <M0rjx> I'm thinking of giving this a go and see if it improves the temp sensitivity of the hoperf module
[22:24] <M0rjx> Evening mr Coxon
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[22:32] <fsphil> oh rob was here
[22:36] <daveake> Ah, didn't recognise the callsign
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[23:05] <SpacenearUS> New position from 03IV3SRD-11 after 039 hours silence - 12https://tracker.habhub.org/#!qm=All&q=IV3SRD-11
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[23:41] <SpacenearUS> New vehicle on the map: 03HORUSLORA - 12https://tracker.habhub.org/#!qm=All&q=HORUSLORA
[23:42] <Darkside> sweet
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[23:59] <SpacenearUS> New vehicle on the map: 03WHS - 12https://tracker.habhub.org/#!qm=All&q=WHS
[00:00] --- Tue Jul 26 2016