highaltitude.log.20140515

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[01:59] <arko> http://sat.wrh.noaa.gov/satellite/loopsat.php?wfo=sgx&area=west&type=vis&size=1
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[06:36] <ulfr> http://bifrostaurora.org/
[06:36] <ulfr> just a bit of a spam
[06:36] <ulfr> too bad the timing went wrong, but our launch is in few minutes, then again at 8:45 UTC
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[07:06] <Earthshine2> Morning
[07:07] <UpuWork> morning
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[10:43] <DL7AD_> hi
[10:43] Nick change: DL7AD_ -> DL7AD
[10:49] <sp2ipt> hi
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[11:16] <amell> ZURG1: Max. Altitude: 56133 m - seriously?
[11:16] <daveake> Just testing
[11:16] <daveake> Altitude faked to test cutdown logic
[11:17] <mfa298> trying to beat the mexicans at their own game?
[11:18] <daveake> :)
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[11:36] <gonzo___> MAFIA
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[11:38] <daveake> nah FBI
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[11:38] <mattbrejza> daveake: time to kit out the chase bike?
[11:39] <daveake> Don't even need that!
[11:40] <daveake> http://predict.habhub.org/#!/uuid=a21006bd7c032aadbca226a11252f67bc495a41a
[11:40] <mattbrejza> doesnt take much for it to go a few miles down the road
[11:41] <jonsowman> .7km
[11:41] <jonsowman> :D
[11:41] <mattbrejza> although you probably wouldnt want to cycle on those roads
[11:41] <mattbrejza> looks 60mph hilly country lane
[11:41] <daveake> it is
[11:42] <mattbrejza> even for hte novelity of first hab recovered by bike
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[11:44] <daveake> :)
[11:51] <mfa298> with that flight path there should be some reference to infinity in the flight (although with Buzz and Zurg I realise we're close anyway)
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[11:52] <daveake> "To somewhere and back to where we started"
[11:52] <Rebounder> :)
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[16:33] <DL7AD> hi
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[17:24] <ibanezmatt13> evening. In eagle I need to create my own pad for a transformer. Does anybody know on what layer you draw pads with the dimension tool?
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[17:30] <mikestir> what are you trying to do? just a solder pad?
[17:30] <ibanezmatt13> yeah
[17:30] <mikestir> well there are solder pads in the library
[17:30] <ibanezmatt13> see here http://pbrd.co/1lkgAn7
[17:30] <mikestir> so if size isn't critical then one of those would probably do
[17:30] <ibanezmatt13> they're not a standard shape
[17:31] <ibanezmatt13> for the underside of a transformer, inductor types arrangement
[17:32] <ibanezmatt13> so I've got my lines drawn on to show me where to start/stop the hexagonal shaped pads here: http://pbrd.co/1lkgLPg just need to work out the layer to draw them in
[17:32] <mikestir> oh so you're trying to do this in the library editor?
[17:32] <ibanezmatt13> yep
[17:32] <ibanezmatt13> (never done before)
[17:32] <mikestir> yeah I'm not sure how you create a non-standard pad shape. normally you'd just use the SMT pad tool which creates the whole padstack for you
[17:33] <ibanezmatt13> ah ok, no probs. I'm sure there'll be a layer for it. There's one called "pads" but it comes up a green colour, and sounds too obvious :)
[17:33] <mikestir> you'll need to draw in more than one layer I guess - copper, solder mask and paste
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[17:33] <ibanezmatt13> ah yeah never thought about that
[17:33] <ibanezmatt13> time for some googling :P
[17:33] <mikestir> and you'll somehow need to convince it to let you map your pins to the polygon
[17:34] <ibanezmatt13> yeah, I'll see if I can find something on the web, if there's something about custom pads all that should be detailed I think
[17:34] <ibanezmatt13> https://learn.adafruit.com/ktowns-ultimate-creating-parts-in-eagle-tutorial/creating-your-first-pad :)
[17:35] <ibanezmatt13> ah damn, only for normal pads
[17:35] <mikestir> it never used to be possible without DRC violations, but I have a feeling it is possible in EAGLE 6
[17:36] <mikestir> or you could just place 4 rectangular pads at 45 degree angles and don't worry about the excess
[17:36] <ibanezmatt13> yea, reckon I should just use large pads that stick out?
[17:36] <ibanezmatt13> yea
[17:36] <ibanezmatt13> that's most likely the best bet, good enough for this anyway (only a prototype)
[17:37] <mikestir> as long as you don't run into any spacing issues I'd be tempted to do that
[17:37] <mikestir> I take it you are hand soldering it anyway?
[17:37] <ibanezmatt13> most likely, though could use oven
[17:37] <ibanezmatt13> almost certainly hand soldering yea
[17:39] <mikestir> right. back in a bit, maybe someone else will have some ideas
[17:40] <ibanezmatt13> thanks, see you
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[17:51] <aadamson> ibanezmatt13, can't you just use the polygon tool on the *top* layer and draw a free form pad?, assign it a number/name and use it as a pad, then you can draw your silksceen or soldermask as you like
[17:51] <aadamson> been a while since I messed with Eagle, I'm all converted to diptrace now and never looked back :)
[17:52] <ibanezmatt13> not sure, that sounds feasible
[17:53] <ibanezmatt13> so a pad consists of the copper, a silk screen to go around it, and that's it?
[17:54] <aadamson> The typical way to draw an arbitrary pads shape is:
[17:54] <aadamson> - Place a PAD or SMD
[17:54] <aadamson> - Use POLYGON to draw the final pad shape
[17:54] <aadamson> - For a SMD typically in Layer Top
[17:54] <aadamson> - For a PAD you have to draw the final shape in all the layers you plan
[17:54] <aadamson> to use (Top, Bottom, Inner layers...)
[17:54] <aadamson> The PAD/SMDs center must be inside the polygon's area. Otherwise
[17:54] <aadamson> that polygon is not recognized as a part to the pad. Use a reasonable
[17:54] <aadamson> wire width for the polygon, which fulfils the Design Rules.
[17:54] <aadamson>
[17:54] <aadamson> http://www.element14.com/community/thread/17176/l/custom-pad-shape-creation
[17:54] <aadamson> about 3 or 4 posts down
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[17:54] <ibanezmatt13> oh wow, excellent, thanks! (why didn't I find this)
[17:54] <aadamson> a pad is the copper, the silkscree if any, the solder mask and the paste mask if wanted
[17:54] <ibanezmatt13> ah right
[17:54] <aadamson> and if it needs more than one layer, you'll just have to place those as well
[17:55] <aadamson> I did a google for "custom pads in eagle"
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[17:55] <ibanezmatt13> that's great I'll get right on with it, cheers!
[17:55] <aadamson> no problem have fun
[17:55] <aadamson> btw, most people for those inductors
[17:55] <aadamson> just use square pads :)
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[17:55] <ibanezmatt13> yeah, I may end up doing that yet :)
[17:56] <ibanezmatt13> http://www.coilcraft.com/pdfs/lpr6235.pdf
[17:56] <ibanezmatt13> it's a transformer, but same kinda land pattern
[17:56] <aadamson> hmm... what are you using that for?
[17:56] <aadamson> did was is specified in a datasheet
[17:56] <aadamson> most are using the 3015's
[17:56] <aadamson> for buck/boost applications
[17:57] <ibanezmatt13> yeah this part number was mentioned especially in the datasheet
[17:57] <aadamson> and I think Upu has a footprint for those in his library
[17:57] <ibanezmatt13> thermoelectric energy harvesting
[17:57] <aadamson> ah ok...
[17:57] <ibanezmatt13> yeah using the 3109 and a few others which uses a 1:50 transformer to amplify the voltage without any specific polarity
[17:58] <aadamson> it might be where the coil extends through the bottom of the form of the inductor that you'll want those *special* sized pads so you don't short anything internal to the inductor
[17:58] <ibanezmatt13> possibly yeah, I'd prefer to get the right pads done in an ideal world, shame no part exists :P
[17:58] <ibanezmatt13> checked farnell too
[17:58] <aadamson> yeah, I had to do my own in DT for the 3015's as well...
[18:04] <ibanezmatt13> looks like the transformers are fully sealed aadamson, a sligtly bigger rectangular pad should be ok
[18:04] <aadamson> ah good
[18:05] <aadamson> might be the easiest way
[18:05] <ibanezmatt13> yup
[18:05] <ibanezmatt13> so to start I should draw out the package, place the pads, then name the pads. I'll find out what to do after that later :)
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[18:09] <ibanezmatt13> bbl
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[18:35] <ibanezmatt13> aadamson, you know if i placed 3 rectangular pads so that they overlapped each other in an almost hexagonal way, and I named each pad under exactly the same name, a) do you think it would work as one single bad and b) is it likely to work on the schematic side of things? :)
[18:36] <ibanezmatt13> pad*
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[18:37] <aadamson> that I don't know... sri
[18:38] <ibanezmatt13> np, I'll give it a whirl
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[18:50] <Lunar_Lander> hello
[18:53] <ibanezmatt13> hey
[18:53] <ibanezmatt13> aadamson, http://pbrd.co/1lkBEKe
[18:54] <ibanezmatt13> so two corner squares and a bigger rectangle to join them. If this method works, I could form most of the original shape with many rectangles :)
[18:55] <ibanezmatt13> ok so I've worked out that it doesn't allow pads to have the same name. So I could just wire it up when I come to do the board and ignore the DRC errors
[18:56] <Lunar_Lander> interesting PCB shape
[18:56] <ibanezmatt13> yeah I'm having to make a footprint which has hexagonal shaped pads, so improvising :)
[18:56] <Lunar_Lander> cool!
[18:56] <Lunar_Lander> hexagon
[18:57] <Lunar_Lander> :)
[18:57] <ibanezmatt13> lol
[18:57] <Lunar_Lander> :P
[18:57] <Lunar_Lander> today there was a mouse in the lecture theater
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[18:59] <ibanezmatt13> well aadamson, it's within dimensions: http://pbrd.co/1lkDDhv :)
[18:59] <aadamson> ibanezmatt13, there ya go ;)... looks good
[19:00] <ibanezmatt13> haha, so each "pad" consists of 4 pads
[19:00] <ibanezmatt13> but eagle allows me to only name one of the 4 under the same name
[19:01] <aadamson> ya might want to fixt those little pointy corners too, they won't work very well when the copper is done :)
[19:01] <ibanezmatt13> so if I just name the one pad of the 4, then when I'm routing it out, if I just overrule the DRC and make sure I connect it all up, it might be ok, if it lets me get away with other pads being on top of each other :P
[19:01] <ibanezmatt13> Will do
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[19:01] <RB__> what happened to B-50?
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[19:05] <mikestir> woo. rf comes out of my tracker
[19:05] <Rebounder> :)
[19:06] <mikestir> aadamson: if only I'd actually read the API docs properly I would have noticed the "MSB of fcfrac must always be set to 1"
[19:07] <aadamson> hehe... you talking about the si parts... there are more little gotchas with those than I care to think about :0
[19:08] <aadamson> ah but congrats on RF, that's always exciting... I actually need to hook mine up and check the deviation and output
[19:10] <Rebounder> first light is always great :)
[19:10] <aadamson> I've got my dynamic day/night beacon rate working, now just working on some hysterisis on the low voltage detection on solar so I can say sleeping until volts come up above a little hystersis level from the low voltage cutoff
[19:13] <aadamson> once that is done I'm going to add the plan13 stuff so I can detect ISS and when/if to beacon through it :)
[19:13] <aadamson> I've got the point in polygon stuff done, just need to test it all with some actual passes
[19:15] <mikestir> I'm going to hook this up to the speccy analyser shortly to see what the output power is. I'm hoping I can drop vcc down to 2V and still get +10dBm
[19:17] <aadamson> you should be able, I run at 2v and while I've got a 446x onboard right now, I could go way up in power if I wanted
[19:17] <aadamson> at the expense of mA :)
[19:17] <mikestir> are you supposed to be able to change channel by issuing another start_tx while it's already transmitting?
[19:20] <aadamson> https://github.com/akadamson/STM32F3-SiRadio - a little outdated and for an F3, but check the drv_Si.c file for how I do it...
[19:20] <aadamson> oh wait
[19:20] <aadamson> that doesn't have it... hang on
[19:25] <aadamson> https://dl.dropboxusercontent.com/u/6730484/si446x.zip - mike an early version of my L1 code but it has the setChannel, setup, etc for the 446x in it.
[19:25] <aadamson> bottom line, you need to drop back to ready before you change channel
[19:25] <aadamson> if i remember right
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[19:33] <mikestir> ok that works ta
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[19:33] <mikestir> there's an audible break in the tx though - bit annoying
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[19:36] <aadamson> what are you listening on, and RTL or funcube
[19:36] <aadamson> ?
[19:36] <aadamson> if so it's related to that I believe
[19:36] <mikestir> no, an ar8200
[19:37] <mikestir> going back to ready will cause it to ramp down and back up again
[19:38] <mikestir> to do mfsk type modes well it really needs to retune on the fly
[19:38] <aadamson> ah ok, yea I've noticed that btw, I hear it to, always just blamed it on the dongle, but dl-fldigi decodes it just fine
[19:39] <aadamson> mikestir, I've not played with it, but look at the set mode command, it has some extensions that may allow what you want, if you figure out the right approach, share it, I'll incorporate it as well :)
[19:40] <mikestir> the other possibility is whether it can be fudged via some of the modulator registers
[19:41] <aadamson> yeah
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[19:54] <harvy> Hi!
[19:54] <harvy> Anyone want to talk coathanger antennas?
[19:56] <mfa298> probably depend how you want to talk them.
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[19:59] <Rebounder> :)
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[20:03] <Upu> harvy - no they are spikey and dangrous
[20:04] <Upu> use something more flexible
[20:04] <mfa298> could make a good yagi for use on land (not on the balloon)
[20:05] <mfa298> although not if you use a plastic coathanger
[20:05] <harvy> This is for tracking
[20:06] <harvy> I have the DVB dongle and I have all the software setup, so I was thinking if I just knock up a coathanger antenna, it should work?
[20:06] <Rebounder> better to build 1/4 gp
[20:06] <harvy> I am using this link http://homepage.ntlworld.com/lapthorn/coathanger.htm
[20:06] <Rebounder> harvy: it work for short distances
[20:07] <harvy> Short distance is fine. I just want to test first and then manybe buy a yagi later.
[20:08] <Rebounder> then you stock antenna i just "fine"
[20:08] <harvy> So would antenna in the link work? Is it just a matter of cutting up the coathanger in th right bits and moulding them together?
[20:09] <Rebounder> the moxon, it will work pretty ok i think
[20:09] <mfa298> don't think of it as a coat hanger antenna. There are various designs of antenna (Ground plane, Yagi, Moxon, etc) and various things you can make it out of (component wire, metal coat hangers, copper pipe etc)
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[20:11] <mfa298> using a coathanger to make a groundplane antenna (like the payload antennas) could work reasonably well if it's in a decent location (but as Upu said probably not a good idea to use on a hab)
[20:11] <harvy> So just to test my SDR dongle, a groundplane should work?
[20:12] <mfa298> the real key to a good antenna is a good location for it.
[20:12] <mfa298> and making it the right size for what you want to receive
[20:12] <harvy> http://www.eham.net/data/articles/7005/index3.png so something like this.
[20:13] <Rebounder> for testing and "no" distance any metalhting will work..
[20:13] <mfa298> or even http://ukhas.org.uk/guides:payloadantenna
[20:14] <mfa298> what sort of testing do you want to do with it ?
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[20:16] <harvy> So just to clear this up the recieving and transmitting antenna are the same?
[20:16] <mfa298> the only difference is from what their aim is.
[20:18] <mfa298> so a yagi on a payload probably isn't a good idea (it's directional so you'de loose the signal as the payload spins). But a yagi on the ground is useful for weak signals (the balloon won't be going around your house at any speed so it's possibly to keep the antenna pointing at it)
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[20:40] <aadamson> yet another CC430 project - http://pocketspacecraft.com/
[20:41] <harvy> The ukhas wiki payload aeticle has 164mm length.
[20:42] <harvy> Is that right?
[20:42] <Upu> yes
[20:42] <Upu> 1/4 wave length of 434Mhz
[20:42] <harvy> That's 65.5cm but I thought we need 69/70cm
[20:42] <Upu> 1/4 wave length in free air
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[20:43] <mfa298> harvy: the length depends on what freuency you're interested in. 164mm is the right length for 434MHz (it's not the right length for other bands although might work depending on the band)
[20:44] <harvy> If I'm building one, how tight do the tolerances on this?
[20:45] <mfa298> a few mm out probably won't make a real difference.
[20:45] <mfa298> expecially for the ground plane elements.
[20:45] <Upu> get it as close as you can but like mfa298 says don't get anal over sub mm's
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[20:45] <mfa298> the single driven element is the more critial part to get right (or as close as possible)
[20:46] <Lunar_Lander> good night
[20:46] <Upu> night lunar
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[20:49] <mikestir> aadamson: smooth tuning working
[20:49] <aadamson> how'd you fix it?
[20:49] <mikestir> turn the tx on and then use MODEM_FREQ_OFFSET to apply the modulation
[20:49] <mikestir> this seems to work without the short carrier drop
[20:49] <aadamson> ah, yeah that would work...
[20:49] <aadamson> oh, I never see a carrier drop on mine,
[20:50] <mikestir> surely you must if you go back to ready state?
[20:50] <aadamson> I do hear a distinct clicking of on off, but the carrier remains constant
[20:50] <mikestir> I think the click is probably the PA ramp down and back up again
[20:50] <aadamson> it may be happening, I just can't see it - oh probably because I have smoothing on on my funcube
[20:50] <aadamson> yeah
[20:50] <mikestir> it's probably too short to see
[20:51] <aadamson> I'm sure it's doing it... I'll look at the other option in a bit
[20:51] <mikestir> brb. I'm going to fit an sma connector
[20:51] <aadamson> my primary at the moment is aprs anyway
[20:51] <mikestir> well I'd like to see just how fast you can modulate by changing the offset frequency
[20:52] <mikestir> if you can get up to say 8 kHz updates then you can effectively do analogue fm
[20:52] <mikestir> although you might get some baseband images occurring - worth a try though
[20:53] <aadamson> hmm... I wonder if this would also remedy the need for a specifics crystal freq
[20:53] <aadamson> that determines the channel step size
[20:53] <mikestir> no the LSB of the frequency offset is the same step
[20:53] <aadamson> ah ok
[20:54] <aadamson> did you setup the modem differently?
[20:54] <aadamson> or just use the above in place of the channel change
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[20:56] <aadamson> yeah and run the SPI as fast you can... I'm running mine at 10mhz or whatever the multiple is at my HSE freq
[20:57] <aadamson> and I think you can push the spi if needed above 10mhz, but I've not looked at that
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[20:59] <aadamson> dang it's amazing how long it takes to drop .1v when you have all your power saving turned on - sheesh
[20:59] <aadamson> on a 200mah lipo that is
[20:59] <aadamson> it's be worse on a AA or AAA
[21:02] <mikestir> the only change I made to the modem config was to turn off DSM_LSB in MODEM_DSM_CTRL
[21:02] <aadamson> k
[21:03] <aadamson> ah so you set it to 0x03 instead of the default 0x07?
[21:07] <mikestir> yes
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[21:16] <mikestir> +8dBm at the end of a meter long RG174 patch lead with the PA set to 0x1a, which is quite low
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[21:17] <mikestir> so that doesn't seem too bad
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[21:17] <mikestir> 2nd harmonic 53dB down
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[21:24] <aadamson> sounds like you have a winner
[21:27] <mikestir> what are you doing about aprs? have you got a switchable output filter?
[21:27] <aadamson> made one last tweak to my stop mode current, I'm down too < 2ma (at the battery) when I'm asleep :)
[21:27] <aadamson> no, my filter is tuned for 20mmhz
[21:27] <aadamson> so 200
[21:28] <aadamson> so I can't go to 70cm at the moment
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[21:28] <mikestir> ahh right
[21:28] <mikestir> the harmonics are understandably severe
[21:28] <mikestir> like the 2nd and 3rd are over 0dBm
[21:29] <mikestir> so I won't be using this dual mode!
[21:29] <aadamson> yeah I suspect they are rather ugly
[21:29] <aadamson> at some point I'm going to play with that TI radio part and use s switchable LPF, we'll see... down the road some
[21:30] <mikestir> I suspect the easiest way to do it is just to use two 4060s!
[21:30] <aadamson> hehe... now there's an idea!
[21:30] <aadamson> with a T/R relay
[21:30] <mikestir> no, just two completely separate radios
[21:30] <aadamson> yeah, I mean at the antenna or use 2 antennas
[21:31] <aadamson> I should have said an RF switch
[21:31] <aadamson> there are some really nice ones that are really small
[21:31] <aadamson> sc70 package, etc
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[21:39] <mikestir> the carrier does drop by changing the channel the start_tx way
[21:39] <mikestir> for about 5ms
[21:39] <mikestir> shows up clearly on zero span
[21:39] <aadamson> ah so both way, but much quicker with the new way?
[21:39] <mikestir> no the new way there is no power ramp at all
[21:40] <aadamson> ah, ok, so you were just looking at what the actual drop is... good to know - with the wrong way :)
[21:52] <aadamson> Sats:4 AZ:155.26 EL: -44.73 RX: 145823402 TX: 145826598 Sat Lat: -51.18 Sat Lon: 317.73 RR: 3.29
[21:52] <aadamson> Sats:4 AZ:155.22 EL: -44.75 RX: 145823402 TX: 145826598 Sat Lat: -51.19 Sat Lon: 317.83 RR: 3.28
[21:52] <aadamson> whooo hooo, at least I didn't break my prior work :)
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[22:23] <amell> whats the azimuth and elevation for?
[22:23] <mikestir> this jlink is so fast - I'm impressed
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[22:26] <Rebounder> hello
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[22:31] <mikestir> domex16 working
[22:32] <Rebounder> cool
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[22:54] <g0pai_ian> I realise that you are probably working with other than Atmel328P, mikestir, but with domex16 are you using RSID and is there anywhere I can find the spec or a basic code example?
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[22:56] <g0pai_ian> I am playing with Upu's demo code and have no problem expanding the message to include the essential data fields, but would like to include RSID ahead of the telemetry string. Have you cracked that?
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[22:59] <Laurenceb_> http://shop.actionpro.de/epages/es10473279.sf/sec0c9a1b4d57/?Locale=en_GB&ViewObjectID=21797004
[22:59] <Laurenceb_> cheap
[22:59] <amell> for what use?
[23:00] <mfa298> g0pai_ian: for rsid you might need to dig into the fldigi sources although that may not be the easiest of tasks.
[23:00] <mfa298> you may also find it's more challenging to do with an atmega with the limited pwm.
[23:00] <Laurenceb_> amell: general balloon stuff
[23:00] <Laurenceb_> cheaper than gopro
[23:01] <amell> i would use moebius
[23:01] <amell> https://joovuu.com/gb/
[23:04] <amell> https://joovuu.com/gb/home/98-sj4000-camera.html - £69.99 makes more sense
[23:04] <Laurenceb_> i was after high fps
[23:04] <g0pai_ian> Thanks Laurencab_ and mfa298. Yes, the Arduino pwm does seem to be a bit crippled. I hadn't thought of the fldigi sources (thinking rx only duh!) but it would exercise the grey cells even if only forcing another jump to another processor, in time. All appreciated :-)
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[23:06] <amell> why would you need high fps in a hab?
[23:06] <Laurenceb_> secret projects
[23:06] <g0pai_ian> I think that maybe I'm LeoBodnar inspired, although he's playing well beyond my league.
[23:07] <g0pai_ian> Secret projects - almost thinking Keyhole . . . KML has Talent!
[23:09] <mfa298> once you find the right file in the fldigi sources it's probably not too hard to read - it's c++ like the arduino libs. you'll just need to re-write to use pwm rather than generating audio tones. The first step is probably getting to understand how the domino code and hardware works.
[23:13] <mfa298> although looking at Upu's DominoEX code we might have to teach him about static variables rather than using global variables like that.
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[23:31] <amell> league? hes above leagues
[23:41] <g0pai_ian> mfa298 - I couldn't possibly comment. It was a demo, aimed at a basic level of understanding - I believe! I value the discount offered and future advice, but take your point none-the-less. No point in producing and A class answer for a B class question though eh?
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[23:47] <mfa298> from what I remember of the writeup on Upu's post it does a pretty good job of explaining how dominoEX works and hopefully you can see how that translates into the code. Getting a suitable resistor value is (in theory) just a bit of simple maths (I just treated the pwm like a resistor divider when I did something similar with a Pi).
[23:48] <mfa298> from that if you can find something that describes how rsid works it shouldn't be too hard to apply the same logic to get code that works.
[23:49] <g0pai_ian> amell: yup, definitely a hard act to follow. Probably racking up bombs in B-52 as we speak. That will be one that just has to do the distance. Maybe worth a small sponsorship from Boeing?
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[23:49] <mfa298> the real challenge might be finding a suitable resistor value that works for dominoEX and rsid
[23:50] <g0pai_ian> I believe that a suitable resistor and an appropriate output from a DAC is possibly an easier way of getting an NTX2B to do MFSK. The weight penalty of extra components is unlikely to be an issue for me for a loooong time :)
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[23:53] <g0pai_ian> Using a suitable oscillator, find the basic TX output frequency and then measure the audio shift of the beat as everything wobbles around. Then choose the appropriate values and retest.
[23:53] <mfa298> a good DAC should remove the need for any resistor. I think Upu originally did something with a 12bit DAC which had more than enough resolution
[23:56] <g0pai_ian> I took the demo code and inserted a few Serial.print("A."), Serial.print("B.") etc. to check the basic calling structure. I really need to print it out and map what calls what. At the moment I have a good idea, but it's like touring Pairs looking through the slit in a tank - the whole picture isn't totally clear.
[23:56] <g0pai_ian> Doesn't look difficult to read . . . :)
[00:00] --- Fri May 16 2014