highaltitude.log.20141019

[00:01] <SpacenearUS> New position from 03VK3YT after 0310 hours silence - 12http://habhub.org/mt/?focus=VK3YT
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[00:31] <SpacenearUS> New vehicle on the map: 03vk2hab_chase - 12http://habhub.org/mt/?focus=vk2hab_chase
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[00:45] <SP3OSJ> # habhub
[00:46] <SP3OSJ> #habhub
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[01:14] Action: SpacenearUS is going for a nap.
[01:14] Action: SpacenearUS is back!
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[02:27] <SpacenearUS> New vehicle on the map: 03PYTIN-1 - 12http://habhub.org/mt/?focus=PYTIN-1
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[05:10] <SpacenearUS> New position from 03B-64 after 0312 hours silence - 12http://habhub.org/mt/?focus=B-64
[05:12] <arko> welcome home bud
[05:18] <lz1dev> !whereis b-64
[05:18] <SpacenearUS> 03lz1dev: 03B-64 is over 03Celtic Sea 10(49.6046,-8.63531) at 0312650 meters
[05:22] <arko> more like home
[05:22] <arko> :)
[05:22] <arko> most beautiful flight ever
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[06:06] <lz1dev> !hysplit run b-64
[06:06] <SpacenearUS> 03lz1dev: Your job has been added to the queue. Check in a few minutes
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[06:13] <arko> i hope the predicted lower latitude means theres a chance of it stopping by me :P
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[06:32] <Geoff-G8DHE> Oh good its back!
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[06:56] <G8FJG> looks like b4 is on 434.500 100 going hf
[06:56] <Geoff-G8DHE> Its there on 434.501
[06:57] <G8FJG> contessa ? its been so long
[06:57] <Geoff-G8DHE> partial decode - yes 64/1000
[06:58] <Geoff-G8DHE> $$B-64,421,065459,141019,51.2#79,-5.5731,?260G%G30&67<0K-/ >Y
[06:58] <Upu> yup listening here too
[06:58] <G8FJG> thats why! used 16/100
[06:58] <Geoff-G8DHE> rsid
[06:59] <DG0MG> wow 184 kmh
[06:59] <G8FJG> green
[07:02] <Geoff-G8DHE> yea green
[07:09] <Geoff-G8DHE> !dial B-64
[07:09] <SpacenearUS> 03Geoff-G8DHE: Latest dials for 03B-64 10(3afe): 03434.500175 MHz, 434.5 MHz, 432.649 MHz, 5.3985 MHz, 434.5001 MHz
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[07:14] <lz1dev> !payload b-64
[07:14] <SpacenearUS> 03lz1dev: Payload 03B-64 10(3afe) 03$$B-64 - 03Primary - 03434.5 MHz USB 03DominoEX with speed 0316
[07:14] <lz1dev> suprisingly some of those dials are correct
[07:15] <pc1pcl> looks like it might be receivable here in two hours or so. too bad I'll be out then..
[07:16] <lz1dev> what could be more important than a B flyby?
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[07:17] <nn> flights
[07:17] Nick change: nn -> Guest52358
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[07:17] <pc1pcl> planned outings with non-Blievers.
[07:18] <Guest52358> !flights
[07:18] <SpacenearUS> 03Guest52358: Current flights: 03JOTA1 10(ca7c), 03JOTA2 Launch 10(f24b), 03PS-23 10.142Mhz OLIVIA 8/250 JT65 picoscape.net 10(0c7f), 03PYTIN-1 434.500MHz 10(d8de), 03B-64 434.500 Contestia 64/1000 10(3afe), 03B-66 434.500 Contestia 64/1000 10(705b)
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[07:19] <Guest52358> !whereis B-66
[07:19] <SpacenearUS> 03Guest52358: I haven't got a clue
[07:19] <Geoff-G8DHE> Oh dear JOTA2 is also planning on being on 434.5MHz, good thing B-64 is up a bit !
[07:20] <lz1dev> pc1pcl: shun the nonbelievers
[07:20] <lz1dev> https://www.youtube.com/watch?v=nRB8Jor8tPs
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[07:20] <pc1pcl> :-)
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[07:36] <Upu> At the speed B-64 is going I doubt its going to be an issue
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[07:40] <Upu> my reciever is on the SDR Space Onair page now
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[07:42] <Upu> shame you can't share a radio
[07:44] <Upu> do you lot think this is on 434.501 ?
[07:46] <mikestir> 434.5005 for 2 kHz pips
[07:46] <G8FJG> 434,500760 1k pip
[07:47] <mikestir> I think my rig is about 500 Hz low on 70cm so that sounds about right
[07:50] <Upu> I think I need to calibrate http://i.imgur.com/ld6povq.png :)
[07:52] <Geoff-G8DHE> Yes mine is centered on 434.501.200
[07:52] <Geoff-G8DHE> i calibrated (as best you can in ppm) a few days ago
[07:55] <Geoff-G8DHE> <<2014-10-19T07:54Z Contestia @ 434500150+1000>> from RSID correction
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[08:00] <mikestir> how come it's still txing 2m aprs?
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[08:02] <SpacenearUS> New vehicle on the map: 03kp4arn-9_chase - 12http://habhub.org/mt/?focus=kp4arn-9_chase
[08:02] <Upu> its not
[08:02] <Upu> its doing it on 70cms
[08:03] <mikestir> it seems to be getting picked up by a lot of stations for that
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[08:04] <Upu> only one when I looked
[08:04] <Upu> sr&"Z8sr3w6QM_I6BV>{Ym>J ISM 10mW
[08:04] <Upu> All via G1DYQ-1
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[08:06] <mikestir> ahh yes - I'm looking at the "stations near" bit
[08:06] <mikestir> nvm. I'll go back to sleep
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[08:09] <Geoff-G8DHE> Wow 99days now ...
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[08:11] <Upu> Love Contestia makes me think I'm playing C-64 Paradroid
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[08:15] <Geoff-G8DHE> Time to grab breakfast before it crosses the launch meridian again!
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[08:20] <pfy_> what's the freq etc for B-64 please?
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[08:22] <G8FJG> 434.500100 contestia 64/1000
[08:22] <pfy_> ty
[08:23] <pc1pcl> is its 70cm aprs also at that frequency?
[08:23] <fsphil> wow it's in the uk already?
[08:24] <fsphil> I wasn't expecting that until tonight
[08:24] <pc1pcl> almost out again, doing 180 km/h it seems :)
[08:24] <pc1pcl> hmm, almost 200 even.
[08:25] <G8FJG> pc1pc1 yes
[08:27] <G8FJG> finger trouble should read 434.500800 for 1k pip aprs centre 200hz higher
[08:28] <fsphil> nice, got it
[08:28] <pc1pcl> might get something on that then.. going to leave on some receivers.
[08:29] <mikestir> I retuned my igate but nothing on there yet
[08:31] <fsphil> nice to see a bit receiver count on a B flight :
[08:32] <fsphil> :)
[08:32] <fsphil> big*
[08:32] <fsphil> arg
[08:32] <pc1pcl> one letter difference to reverse the meaning ;)
[08:32] <Lunar_Lander> hello
[08:36] <pc1pcl> :( time to go out.
[08:36] Nick change: pc1pcl -> pc1pcl-qrt
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[08:52] <mightymik> that's not contestia on 434500 ...
[08:52] <Geoff-G8DHE> it s now
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[08:54] <Haxxa> After extensive testing and 4 pcbs and two proto boards I found out today that my ssdcard reader was broken and my device was functional all along - a lot of wasted time :(
[08:54] <mightymik> some voice there on the websdr a few moments ago
[08:57] <Geoff-G8DHE> Its crossed the meridian so its now on the 7th loop of the earth!
[08:58] <[1]chrisstubbs> Morning all
[08:58] <[1]chrisstubbs> wow b-64 is going for it!
[08:59] <[1]chrisstubbs> 135mph
[08:59] <mightymik> i can't hear it on websdr
[09:01] <mightymik> just heard something... it's 64/100?
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[09:01] <mightymik> 64/1000*
[09:01] <Geoff-G8DHE> 64/1000 64 tones in 1000Hz bandwidth
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[09:08] <SpacenearUS> New vehicle on the map: 03JOTA2 - 12http://habhub.org/mt/?focus=JOTA2
[09:08] <chrisstubbs> going to launch shortly
[09:11] <mightymik> i actually got a b-64 decode
[09:11] <fsphil> my last decode was 40 minutes ago
[09:11] <craag> mightymik: o/
[09:11] <fsphil> oh it's really moving fast
[09:11] <fsphil> I'm out of the circle already
[09:12] <mightymik> $$B-64,489,090750,141019,53.7819,-0.4536,12532,10,1,3.89,0.55*CC7E
[09:12] <craag> well done!
[09:12] <db_g6gzh> So B-64 has reported 17430 positions, of which 13418 from APRS, 694 from log and 3318 from listeners (well a few more by now)
[09:13] <PE2G> !dial B-64
[09:13] <SpacenearUS> 03PE2G: Latest dials for 03B-64 10(3afe): 03434.5 MHz, 434.501588 MHz, 434.50076 MHz, 434.500906 MHz, 434.5001 MHz, 1.234 MHz
[09:14] <mfa298> Haxxa: that sounds like a good lesson in having suitable debugging tools on the board (flashing led), or the use of a logic analyzer / scope to check what's happening
[09:15] <Geoff-G8DHE> B-64 Flight path to date colour coded http://360.g8dhe.net/HAB_Flights/2014_Flights/B-64_20140712/index.php?ind=3
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[09:15] <mightymik> scope is too expensive
[09:15] <mikestir> you can buy a logic analyser for under a tenner
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[09:16] <mightymik> i just hacked a AM BCB reject filter from a board i dremeled a pattern on and then soldered it. SMA both ends.
[09:17] <Upu> 2014-10-19 08:41:48.303 M0UPU-1 R M0XER-4>APRS64:!/3S>pN)aBO Z93c%AZ8!^5'?2LXT4:^/_=-9y/A=041056 ISM 10mW|&6KM&X>b!,|
[09:17] <mightymik> cross my fingers and hope it works
[09:17] <Upu> got it on APRS :)
[09:17] <chrisstubbs> JOTA2 up
[09:17] <Upu> what frequency chrisstubbs ?
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[09:18] <mfa298> In terms of the amount of time spent trying to fix timing issues with things a Logic Analyzer is definetly money well spent - it's so much easier when you can see what's happening
[09:18] <Upu> 130mph fsphil :)
[09:18] <chrisstubbs> JOTA2 dial 4344.449
[09:18] <chrisstubbs> 434.449
[09:19] <fsphil> pretty windy on the ground too
[09:20] <Upu> yep
[09:21] <fsphil> oh yes, Mars has the comet flyby today
[09:24] <craag> Decode on JOTA2
[09:24] <craag> -0.3 elevation :)
[09:24] <Geoff-G8DHE> !dial JOTA2
[09:24] <SpacenearUS> 03Geoff-G8DHE: Latest dials for 03JOTA2 10(f24b): 03434.45 MHz, 1.234 MHz
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[09:24] <fsphil> hah
[09:25] <craag> 434.45
[09:25] <craag> hah just noticed 1.234 is me :P
[09:25] <Geoff-G8DHE> right in the middle of some hash :-(
[09:26] <craag> !dial JOTA2
[09:26] <SpacenearUS> 03craag: Latest dials for 03JOTA2 10(f24b): 03434.45 MHz, 1.337 MHz
[09:26] <craag> yay leet
[09:27] <chrisstubbs> I'm only picking up 1 $ on JOTA2, anyone else decoding?
[09:28] <mightymik> i'm on B-064 atm
[09:28] <G8FJG> ok here
[09:28] <craag> yep decoding fine here: $$JOTA2,...
[09:28] <Geoff-G8DHE> still below my horizon
[09:29] <craag> *very* string
[09:29] <craag> *strong
[09:30] <craag> very string, many strong
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[09:31] <chrisstubbs> hmm odd
[09:31] <chrisstubbs> ah squelch
[09:31] <chrisstubbs> sorted
[09:31] <chrisstubbs> not my radio :)
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[09:39] <Paul_M0PFX> what freq is the jota2 balloon on?
[09:39] <craag> 434.45
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[09:41] <Paul_M0PFX> cheers
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[09:42] <edmoore> nice photography: http://alastairphilipwiper.com/blog/copenhagen-suborbitals/
[09:46] <Lunar_Lander> very nice
[09:46] <db_g6gzh> you can't beat shed based manned spaceflight
[09:49] <PE2G> First greens from B-64 at 432 km -0.3 deg
[09:49] <edmoore> well you can, annoyingly
[09:49] <edmoore> needs lots of buck rogers to do anything
[09:49] <Haxxa> hey edmoore I finished my sensors
[09:49] <Haxxa> - antartica ones
[09:50] <edmoore> nice
[09:50] <edmoore> happy with the result?
[09:52] <db_g6gzh> yeah but I'm impressed by what they're doing
[09:52] <Haxxa> sort of.. my sdcard sensor has a broken trace on it - cause of issue and now only works with 5v line which has voltage regulator on it which wastes energy so now wait for a new sd card reader to arrive but otherwise all good to go
[09:52] <edmoore> db_g6gzh, yes me too. it's inspiring stuff. I have a couple of issues with the way they go about things but that's perhaps more down to taste. but i'm down with their ductus
[09:53] <edmoore> Haxxa, such is life
[09:53] <edmoore> how are you coming round to the idea of treating yourself to a decent multimeter?
[09:54] <Haxxa> well I just bought a new phone, watch, car, power supply so will come round to it but waiting a lot of expenses recently
[09:55] <edmoore> you can add an oscilloscope to the list too
[09:55] <fsphil> always need a good PSU
[09:55] <edmoore> best single electronics invetment
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[09:55] <DutchMillbt> !dial JOTA2
[09:55] <SpacenearUS> 03DutchMillbt: Latest dials for 03JOTA2 10(f24b): 031.337 MHz, 434.45 MHz, 434.44933 MHz, 434.44926 MHz, 434.449 MHz
[09:55] <mightymik> just find a friend that has on and drop in sometimes
[09:55] <Haxxa> oscilloscope - will come from school hopefully - I'll nudge them towards it
[09:56] <edmoore> good
[09:56] <Haxxa> Dave Jones did a recent review of $400 scope too
[09:56] <edmoore> the 1054
[09:56] <edmoore> ?
[09:56] <edmoore> basically get the rigol ds1054z if that's your budget
[09:56] <edmoore> as far as i can see, nothing else comes close to it for that price
[09:57] <Haxxa> why - the new one is the same but better screen etc.
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[09:57] <edmoore> the 1054z is the new one
[09:57] <Haxxa> oh ok opps
[09:57] <fsphil> 1052 is the old one
[09:58] <edmoore> although i know i want something with higher bandwidth for a reasonably proportion of my work, i'm still going to get one
[09:58] <fsphil> I have one and it's still good. but the screen is so tiny compared to the new ones
[09:58] <edmoore> and then i can save up for the 350-1GHz bandwidth scope at a more leisurely pace
[09:58] <Haxxa> Random question - Trailing Edge vs Leading Edge Dimmers for Leds I understand what it looks like not sure what is better and why? Anyone have resource I could read up or know
[09:59] <fsphil> the intensity gradient display looks nice too
[09:59] <edmoore> not my field at all i'm afriad, no idea
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[09:59] <Haxxa> fe
[10:00] <edmoore> right imma go and hit the market
[10:00] <edmoore> bbl
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[10:01] <PE2BZ> !payload jota2
[10:01] <SpacenearUS> 03PE2BZ: Payload 03JOTA2 10(f24b) 03$$JOTA2 - 03Normal Mode - 03434.5 MHz USB 03RTTY 50/450Hz ASCII-7 none 2
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[10:03] <PE2BZ> !payload b64
[10:03] <SpacenearUS> 03PE2BZ: Can't find a flight doc matching your query
[10:03] <PE2BZ> !payload b-64
[10:03] <SpacenearUS> 03PE2BZ: Payload 03B-64 10(3afe) 03$$B-64 - 03Primary - 03434.5 MHz USB 03DominoEX with speed 0316
[10:03] <mikestir> Haxxa: iirc, you want a trailing edge dimmer because it is less stressful on the lamp's power supply. A standard triac dimmer cuts off the leading edge of each cycle, so you get a very rapid increase in voltage at the point that the triac turns on so you get large current spikes
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[10:05] Nick change: [1]chrisstubbs -> chrisstubbs
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[10:10] <Haxxa> mikestir thanks I read up then I guess traling edge are more expensive otherwise while would leading edge exist
[10:12] <Herman-PB0AHX> $$JOTA2,276,10:11:75,51780148,01.247126l24w0.5.5v.51,1,1.40,9*91ED red line now
[10:12] <DutchMillbt> PE2BZ hi neighbor JOTA2 @ 434.448.76
[10:13] <bertrik> Herman-PB0AHX: nice, you're still outside the blue circle?
[10:13] <Herman-PB0AHX> yes i know thats happend lol
[10:14] <bertrik> "ducting" :)
[10:14] <Herman-PB0AHX> i think so
[10:14] <bertrik> !dial jota2
[10:14] <SpacenearUS> 03bertrik: Latest dials for 03JOTA2 10(f24b): 031 MHz, 1.337 MHz, 434.449 MHz, 434.44933 MHz, 0.01 MHz, 434.44906 MHz
[10:14] <Herman-PB0AHX> i have only 1 antenne in the tower now yesterday al other removed for revision
[10:15] <mikestir> Haxxa: you can make a leading edge dimmer from nothing more than a triac and a pot, so that's what pretty much all older dimmers intended for incandescent lighting will be because a hot filament doesn't care about the high slew rate
[10:15] <Herman-PB0AHX> GREEN $$JOTA2,291,10:15:05,51.804543,01.315619,2624.4,61.39,1,1.41,8*ED28
[10:15] <Haxxa> right it seems odd that they are the most sold at local hardware store
[10:16] <bertrik> I can see the signal very faintly in the waterfall, but not strong enough yet to decode
[10:17] <Herman-PB0AHX> 207 km now from me
[10:17] <Herman-PB0AHX> JOTA/JOTI 2014 - http://jotajoti.info/
[10:18] <mikestir> Haxxa: I guess because the cheapest LED lamps and most CFLs aren't dimmable anyway, so people are either still using incandescents in their dimmable fittings, or they've just got rid of the dimmer
[10:18] <Herman-PB0AHX> also from ballon hihihi fun
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[10:19] <Laurenceb_> oops
[10:19] Action: Laurenceb_ slept too long
[10:19] <Laurenceb_> should have got a scope out for B-64
[10:20] <Laurenceb_> clear sky here in Derby
[10:22] <Laurenceb_> wow B-64 is going fast
[10:25] <bertrik> finally got some jota2 green decodes, using a 440 Hz (instead of 450 Hz) shift by the way
[10:25] <PE2BZ> DutchMillbt Hi. Now I am running B-64, and the meteosonde from Cabauw. My third PC is in use by my wife...So now I mailed a new HAM in Hook of Holland to give the Jota2 a try....
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[10:27] <craag> Yep shift has narrowed a bit, so guessing ntx2[,b] :)
[10:28] <PE2BZ> Hi. Is there a prediction for the Jota2 somewhere ?
[10:28] <craag> yep http://ready.arl.noaa.gov/hypubout/117149_trj001.gif
[10:28] <fsphil> lol, half way over the north sea already
[10:29] <PE2BZ> craag Thanks! Going for lunch, brb
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[10:38] <Laurenceb_> so, in a few hours B-64 will be a viable loon candidate
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[10:41] <fsphil> just add wifi
[10:42] <Laurenceb_> lol
[10:42] <Laurenceb_> the wifi part of loon seems pretty stupid
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[10:42] <Laurenceb_> having said that they have some crazy loon to loon all optical mesh network in the patent
[10:42] <Laurenceb_> looks fairly unbuildable
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[10:45] <Laurenceb_> B-64 is back at 17500Pa
[10:46] <Laurenceb_> same as a week after launch
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[10:58] <craag> 5000m and still climbing :)
[11:06] <staylo> Is there a groundspeed figure anywhere?
[11:07] <Upu> yes
[11:07] <Upu> http://habitat.habhub.org/mobile-tracker/?filter=B-64;JOTA2
[11:07] <Upu> JOTA ~ 36m/s B-64 60m/s
[11:07] <edmoore> 130mph
[11:07] <Upu> good speed
[11:07] <edmoore> jetstreams are the place to be
[11:17] <PE2G> According to this news report, MetService NZ use a radar reflector to slow the descent of their met-sondes: http://www.nzherald.co.nz/wairarapa-times-age/news/article.cfm?c_id=1503414&objectid=11344054 (No mention of a parachute)
[11:17] <PE2G> Quote: "The balloon's biodegradable radar target measured about 40cm by 40cm and was made from cardboard and aluminium foil. It enabled radar tracking and slowed the descent to prevent property damage or injury "in the even more rare possibility that it landed on somebody".
[11:20] <Haxxa> Could I have a detector that detects when ballon is popped and lauches a hobby rocket has this been done before?
[11:20] <Laurenceb_> lol biodegradable
[11:21] <Haxxa> and it would it work?
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[11:22] <Laurenceb_> it wouldnt
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[11:22] <Laurenceb_> not enough air to keep the rocket pointing upwards
[11:22] <DutchMillbt> !dial B64
[11:22] <SpacenearUS> 03DutchMillbt: Can't find a flight doc matching your query
[11:22] <DutchMillbt> !dial B-64
[11:22] <SpacenearUS> 03DutchMillbt: Latest dials for 03B-64 10(3afe): 03434.5005 MHz
[11:24] <Darkside> PE2G: they do the same here
[11:24] <Darkside> i can gt a pic of the reflctor if you want
[11:25] <Darkside> http://rfhead.net/wp-content/uploads/2014/09/IMG_20140921_111131.jpg
[11:25] <Darkside> thats one model of reflector i've seen
[11:25] <Darkside> thats using polystyrene foam, with foil on the outside
[11:25] <Darkside> theres also a newer reflector model i've seen which is a cardboard reflector with foil
[11:25] <Vostok_> reflecting stupid sunlight back to where it came from
[11:25] <Vostok_> that'll teach the sun
[11:25] <PE2G> Darkside: Many thanks for the pic! Where are you?
[11:26] <Darkside> PE2G: Adelaide, South Australia
[11:26] <Darkside> PE2G: i'm after a RS41 for reverse engineering btw
[11:26] <Darkside> i've made a few posts to the sondemonitor group about thm
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[11:27] <Darkside> thy'r estill flying the RS92SGP's here, im not sure they have plans to switch to teh RS41s anytime soon
[11:27] <PE2G> Darkside: OK, missed that. Never seen such use of a radar reflector in Europe
[11:28] <Darkside> its because we used analog sondes for years
[11:28] <Darkside> and the retroreflector was for windfinding, using radar
[11:28] <Haxxa> Laurenceb_ some don't need oxygen to sustain propulsion chemical reaction
[11:29] <Darkside> PE2G: http://vimeo.com/19826431
[11:30] <Darkside> thats how they launched in the pure radar-reflctor days
[11:31] <Haxxa> So has anyone got to Stratosphere before?
[11:32] <Darkside> well
[11:32] <Darkside> sure
[11:33] <Darkside> most 'normal' flights will get >20km alt
[11:33] <PE2G> Darkside: Thanks for the vid. In the 80s and earlier, they used radar tracking here too, then LORAN-C (RS92-KL), and now GPS
[11:34] <Darkside> yeah
[11:34] <Darkside> i'm well familiar with the RS92SGPs
[11:34] <Darkside> did a bit of work gtting them onto what was our ham band
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[11:34] <Darkside> though we lost 420-430MHz a few years ago, and the PLLs wont lock >420.1MHz or so
[11:35] <Darkside> i'm very interestd in the RS41s, as they have lots of good parts we can use
[11:35] <Darkside> and if they havent locked down the STM32F100 uC on them, they are porentially re-usable
[11:35] <Haxxa> Darkside what laws in Australia do I need to consider?
[11:35] <Darkside> (if they have, we desolder the STM32F100 and put another one on)
[11:35] <Darkside> Haxxa: Part 101.E
[11:35] <Darkside> argh
[11:35] <Haxxa> Also retrieving surley I cannot enter onto some random person's property...
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[11:35] <SA6BSS-Mike> first aprs packet from m0cer 707km
[11:35] <Haxxa> of?
[11:36] <Darkside> Civil Aviation Regulations Part 101.E
[11:36] <SA6BSS-Mike> *m0xer
[11:36] <mattbrejza> can you erase protect them though, or just read protect?
[11:36] <Darkside> mattbrejza: nfi
[11:36] <Darkside> dont know enough about them
[11:36] <Darkside> but i'd love to get my hands on one to find out!
[11:36] <mattbrejza> i have the applicaiton open, lets have a look
[11:37] <Haxxa> Darkside anything key in there a lot of jargon I am working through
[11:38] <Darkside> Haxxa: balloon launch classes
[11:38] <Darkside> Small, Light, Medium, Heavy
[11:38] <Darkside> our regular launches fall somewhere betwen the Light and Medium categories
[11:38] <mattbrejza> theres an option to add and remove write protection, so who knows
[11:38] <Haxxa> So I need to let them know first?
[11:38] <Darkside> Medium category has a lot of requirements, like ADS-B and other stuff
[11:38] <Darkside> you need to talk to casa, get a launch site approved
[11:39] <Darkside> then when you get around to launching, get a NOTAM issued
[11:39] <Darkside> and on the day of the launch, you need to talk to local ATC and get final permission
[11:39] <Haxxa> Wow!
[11:39] <Darkside> you're also meant to tell them when the baloon bursts, but they generally dont care about it once it's in the air
[11:39] <craag> elevation -0.5 degrees on websdr and still decoding
[11:39] <Haxxa> Thats so much info
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[11:40] <Haxxa> So you really need to be dedicated...
[11:40] <Darkside> Haxxa: so the CASA regs have problems
[11:40] <Darkside> Haxxa: there are som econtradictions in them
[11:41] <Darkside> i.e. the :light" balloon category talks about balloons with payloads <4kg, but the balloon isn't allowd to have a diameter >2m
[11:41] <Darkside> which doesnt make sense, as any balloon which can lift a 4kg payload will be bigger than 2m at some point in the flight
[11:41] <Darkside> the medium category only covers weights betwne 4-6kg, and has a huge amount of requirements to follow (i.e. ADS-B and stuff)
[11:42] <Darkside> then you have Heavy... just don't go there
[11:42] <Haxxa> hmmm.. so there is no inspection so I guess go with light for ease of use
[11:42] <Haxxa> less annoyances
[11:42] <Darkside> so technically the light balloon category doesn't cover our launches
[11:42] <edmoore> Haxxa, on entering people's property
[11:42] <edmoore> 1) if it's like 2m from the side of the road we normally just grab it
[11:42] <Haxxa> freely enter and don't tell them I know
[11:42] <Darkside> but.. we told CASA what we launch, and they put us in the light balloon category
[11:42] <Darkside> lol
[11:42] <Haxxa> - joking
[11:42] <edmoore> but if it's definitely on someone's property, we've never actually had anyone not let us find it
[11:43] <Darkside> Haxxa: generally people are really intrstd
[11:43] <Darkside> espcially if you show them the payload aftr you recover it
[11:43] <edmoore> if you just knock on the door and apologise for disturbing them and explain what you're up to, they're usually quite pleased to let you have a look
[11:43] <edmoore> and want to come and see
[11:43] <edmoore> yeah, what Darkside said
[11:43] <Darkside> farmers are usually quite nice, so long as you don't trampl their fields
[11:44] <Haxxa> Well if some guy turned up to my house and said a thing from space has fallen into your garden I would A think they were mental or B be interested
[11:44] <Darkside> not space
[11:44] <Darkside> just say weather balloon
[11:44] <Darkside> most people have some idea of what a weather balloon is
[11:44] <edmoore> space would be lying
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[11:45] <Haxxa> is space only after exosphere
[11:45] <Darkside> >100km is the usual limit
[11:46] <edmoore> yeah, there's a concept called the Karman line at 100km which is the broadly accepted definition of the start of space
[11:46] <SA6BSS-Mike> !dial B-64
[11:46] <SpacenearUS> 03SA6BSS-Mike: Latest dials for 03B-64 10(3afe): 03434.5005 MHz
[11:47] <Haxxa> well we are more than half way 0.5 is rounded generally to 1 so logically in space
[11:47] <Darkside> no
[11:48] <Darkside> you dont even get half way
[11:48] <Darkside> you get to maybe 0.4 if you are *really* lucky
[11:48] <Haxxa> 2002 weathervallon did
[11:48] <Darkside> which is rounded *down* :P
[11:48] <edmoore> that wasn;t a conventional weather balloon
[11:48] <Darkside> maybe with a huge ZP envelope
[11:48] <Darkside> (zero pressure)
[11:48] <edmoore> basically, under precisely no circmstances can you say you're putting something in space
[11:48] <Darkside> you wont do that with a latex balloon
[11:48] <edmoore> if using a weather balloon
[11:48] <edmoore> sorry
[11:49] <Haxxa> ahhh but it would sound that much coooler
[11:49] <Darkside> "into the stratosphere" is probably the most tchnically correct statment
[11:49] <Darkside> sure, it sounds cooler. but it's also wrong
[11:49] <Haxxa> :(
[11:49] <edmoore> here we are men of science
[11:49] <edmoore> and women
[11:49] <Darkside> edmoore: we are men of women?
[11:50] <Darkside> some of us might be men of men
[11:50] <Darkside> which is totally OK
[11:50] <edmoore> i forgot how to BNF
[11:50] <Darkside> BNF?
[11:50] <Haxxa> I did a case study on gender bias and equal rights in science fields - long story short you might be correct in saying men - science culture and tech culture are terrible...
[11:51] <edmoore> backus-naur form
[11:51] <Haxxa> Science should be universal :(
[11:51] <edmoore> it's actually not relevent here with the english language
[11:51] <edmoore> i'm just being silly
[11:51] <Darkside> edmoore: tis ok
[11:51] <edmoore> basically i can;t grammar
[11:51] <Darkside> or use punctuation
[11:52] <edmoore> Haxxa, if you want to put stuff in space proper, i recommend getting into rockets
[11:52] <Darkside> but punctuation is kind of left at the wayside on IRC anyway
[11:52] <Darkside> edmoore: rocket scene here is a bit shit apparnetly
[11:52] <Darkside> sure, we have an *awesome* rocket range
[11:52] <Darkside> but its hard to use
[11:52] <Haxxa> hmmm no hobbist with less tghan 10,000$ has ever gotten to space
[11:53] <Haxxa> https://www.youtube.com/watch?v=-t96x5UGOLE - someone had same idea
[11:53] <Darkside> heh
[11:53] <Darkside> they forgot that it woudl be cold
[11:53] <Darkside> whoops.
[11:53] <edmoore> Darkside, yeah that's a shame
[11:54] <Haxxa> wow - lots have had - https://www.youtube.com/watch?v=q3KI3hIyaIU
[11:54] <Haxxa> and I thought I was original :(
[11:54] <Darkside> so you wont be able to do that in australia
[11:54] <Darkside> the rocket undr balloon part
[11:55] <edmoore> yeah rockoons have been about a bit
[11:55] <Darkside> CASA will not let you do that anywhere other than woomera
[11:55] <Haxxa> rockets - I lauch them all the time at local park
[11:55] <Darkside> i mean from a balloon, at high altitude
[11:55] <Darkside> they dont like things like that
[11:55] <edmoore> it's probably possible
[11:56] <Haxxa> rockets propelled from flying device - meh no harm
[11:56] <edmoore> but you have to not come across like a nerd from the internet in a garage
[11:56] <Darkside> lol
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[11:56] <Haxxa> got to go anyway night
[11:56] <Darkside> yes 11pm
[11:56] <Darkside> i should go to bed too
[11:56] <Haxxa> night then
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[12:07] <G8FJG> lost JOTA 2 @ -0.3 ...317km
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[12:21] <Jeeves> Hi all. Does anyone know what the meaning of the green and blue circles in the map is?
[12:22] <SA6BSS-Mike> 0° Radio Horizon and 5° Radio Horizo
[12:23] <Jeeves> Oh, right. Thanks!
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[12:37] <Rebounder> !flight B-64
[12:37] <SpacenearUS> 03Rebounder: Flight 10(3afe): 03B-64 434.500 Contestia 64/1000 10(1 payload) - Launch date 0331/08/2014 from 03Northamptonshire, UK 10(52.09598,-1.02228)
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[12:44] <SpacenearUS> New vehicle on the map: 03car_chase - 12http://habhub.org/mt/?focus=car_chase
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[12:56] <SpacenearUS> New vehicle on the map: 03iz7gll_chase - 12http://habhub.org/mt/?focus=iz7gll_chase
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[13:40] <qyx_> JOTA1 is going to hit the water?
[13:42] <Geoff-G8DHE> It did it yesterday
[13:43] <chrisstubbs> Geoff-G8DHE beat me, keyboard batteries ran out
[13:43] <chrisstubbs> ;)
[13:44] <chrisstubbs> scouts loved the event, made loads of radio contacts too by the sounds of it
[13:44] <qyx_> O_o 23 hours ago
[13:44] <chrisstubbs> http://www.essexham.co.uk/news/basildon-jota-day-one.html
[13:44] <Geoff-G8DHE> I was trying to do something on my server the other day, I changed from VNC on my machine to direct, and found the kbd batteries were flat!
[13:47] <Steve_G0TDJ_> Hey Guys
[13:47] <chrisstubbs> Hi Steve
[13:47] <Geoff-G8DHE> Afternoon
[13:47] <chrisstubbs> JOTA2 is going strong!
[13:48] <Steve_G0TDJ_> Good Afternoon - Yeah well cool. Just uploading launch video from Pete
[13:48] <Steve_G0TDJ_> chrisstubbs: Can you remember Pete's callsign?
[13:48] <chrisstubbs> M0PSX
[13:48] <Steve_G0TDJ_> Cheers! I knew it had an X in it LOL
[13:49] <chrisstubbs> I think this one needs to go on the wiki https://pbs.twimg.com/media/B0TOg3mIUAEESu9.png:large
[13:50] <Steve_G0TDJ_> LOL An interesting launch position :-)
[13:52] <Herman-PB0AHX> Steve_G0TDJ_: JOTA2 er very stble hier today nice
[13:52] <Steve_G0TDJ_> Cheers Herman-PB0AHX Thanks for your message on the list too :-)
[13:53] <Herman-PB0AHX> ure welcome
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[13:54] <Steve_G0TDJ_> It was quite hectic over the weekend, but fun. Really enjoyed it. chrisstubbs was invaluable helping me to float JOTA2
[13:55] <Herman-PB0AHX> JOTA2 is a better than JOTA1 more stable
[13:56] <Steve_G0TDJ_> ;-)
[13:56] <joem6jnj> Well done Steve, a very good flight
[13:57] <Herman-PB0AHX> from the 1170 lines i writing now 825 lines nice
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[13:59] <Geoff-G8DHE> Is JOTA2 in turbulence, height varying quite a bit both ways
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[14:00] <Herman-PB0AHX> now i lost him red lines now here
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[14:12] <Herman-PB0AHX> and green agn
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[14:17] <Steve_G0TDJ_> Cheers joem6jnj - Thanks for tracking Herman
[14:20] <Herman-PB0AHX> Steve_G0TDJ_: no problem i like to writing ballons ure team make a good job
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[14:21] <Steve_G0TDJ_> I just posted the launch video on YouTube: http://youtu.be/wFZgtTIJ9-M It's not very long but it shows me launching from 11m up
[14:22] <Lunar_Lander> thanks
[14:23] <Lunar_Lander> :)
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[14:28] <myier> hello
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[14:29] <myier> Steve_G0TDJ_: I believe you forgot the link to the video in your last tweet
[14:30] <Steve_G0TDJ_> myier: LOL Yeah, just too tired :-) Reposting
[14:30] <myier> :)
[14:31] <Steve_G0TDJ_> Hopefully that's better LOL
[14:31] <myier> yep ;)
[14:31] <Herman-PB0AHX> Steve_G0TDJ_: nice launch video
[14:32] <Steve_G0TDJ_> Thank, I was lucky to have Pete to film for me.
[14:32] <Herman-PB0AHX> Steve_G0TDJ_: some times u need lucky
[14:32] <Steve_G0TDJ_> So true
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[14:47] Nick change: Steve_G0TDJ_ -> Steve_G0TDJ
[14:48] <craag> Steve_G0TDJ: Fantastic signal, decoded down to -0.6 on the websdr
[14:48] <craag> ntx2?
[14:49] <Steve_G0TDJ> Yeah, NTX2B
[14:49] <craag> If you'd said rfm22, I'd have suspected you'd misprogrammed the power ;)
[14:49] <Steve_G0TDJ> LOL
[14:50] <Steve_G0TDJ> That was the whole point of designingVAYU-NTX for the stability
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[14:53] <craag> Certainly achieved that - one of the most stable I've seen for a while - and a 6km float is fantastic, well done!
[14:53] <Steve_G0TDJ> Cheers, but I hae to give Chris a lot of credit for helping me out with the float prep.
[14:54] <SA6BSS-Mike> jota2 predict. http://predict.habhub.org/#!/uuid=e7868502db5dc75ecd36089b8b30c9a530538df3
[14:54] <Steve_G0TDJ> Over a lot of water :-) Thanks Mike
[14:55] <Steve_G0TDJ> I'll have to design a solar powered payload (Whatch out Leo LOL)
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[15:00] <Steve_G0TDJ> Right guys, I'm going to get some rest! It's been a busy weekend. Many thanks to all the trackers - Blog entry and pics to follow
[15:01] <craag> Seeya!
[15:01] <Steve_G0TDJ> 73
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[15:18] <PE2G> I'm losing JOTA2 at 320 km, -0.4 deg.
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[16:14] <fsphil> B-64 within range of Russia already
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[16:16] <craag> It'll just keep accelerating until it can charge itself off the earth's magnetic field :D
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[16:23] <Speedevil> :)
[16:29] <Maxell> I heard B-64's battery might be dead, whats up with that?
[16:30] <craag> It's probably suffering a bit with cold temp cycles
[16:31] <craag> But most of the problem has been reduced solar power at northen latitudes I think
[16:31] <craag> Compared to mid-summer when it was launched.
[16:32] <SA6BSS-Mike> that be B-66 that ended up with a bad battery
[16:36] <SA6BSS-Mike> OZ1SKY_Brian: got a dial for jota2
[16:36] <OZ1SKY_Brian> Yes 434.449.0
[16:36] <Speedevil> craag: Well.
[16:37] <Speedevil> Another 3 months and it starts to fix itself
[16:37] <cm13g09> lol
[16:37] <cm13g09> how long do we reckon B-64 will stay up now
[16:44] <ulfr> only time will tell.
[16:45] <ulfr> I just noticed that b-64 hasn't gone over the equator.
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[16:47] <craag> Yeah, isolated wind systems in north/south hemisphere
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[16:51] <fsphil> it would be pretty unusual if it did
[16:51] <fsphil> though I'm sure it's not impossible
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[17:51] <Sputnik_> Hello!
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[18:05] <Lunar_Lander> hello
[18:08] <fsphil> yo
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[18:14] <fsphil> 15 minutes to mars and comet closest approach
[18:15] <ulfr> Is the life on mars in danger?
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[18:26] <fsphil> yes, it may leave the planet lifeless
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[18:27] <fsphil> closest now
[18:28] <ulfr> well, as martians are just robots, they might stand a chance.
[18:29] <x-f> they too die sometimes.
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[18:30] <x-f> i still miss Phoenix
[18:30] <ulfr> Well. Perhaps there'll be a chance in the future to save them.
[18:31] <ulfr> If we finally manage to build a settlement there.
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[18:56] <arjun_> Which antennas should I use for chase cars
[18:56] <ulfr> magnetic mount 1/4 ?
[18:56] <ulfr> That's my suggestion.
[18:56] <craag> or 70cm 5/8
[18:56] <ibanezmatt13> Diamond MR-77 is good
[18:56] <Upu> +1
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[18:57] <arjun_> Thx
[18:58] <ulfr> I wonder if the gain of the 5/8 is any good due to the lower angle of radiation.
[18:59] <craag> theoretically the 1/4 wave would be better, as in a chase car you want to be as underneath as possible
[18:59] <craag> but 5/8 are more common, and work fine
[18:59] <ulfr> mhm
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[19:03] <Upu> buy my ICOM for the car :)
[19:04] <craag> I use a 3/4 wave which works rather well underneath
[19:04] <craag> (full length 2m 1/4 wave)
[19:05] <craag> But loses it a noticeable few seconds early on the descent
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[19:09] <jcoxon> i didn't realise B-64 did a flyby
[19:10] <jcoxon> missed that
[19:10] <Upu> @ 160mph
[19:10] <Upu> didn't last long
[19:18] <LazyLeopard> Zoooooom!
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[19:39] <SpacenearUS> New vehicle on the map: 03kp4mcr_chase - 12http://habhub.org/mt/?focus=kp4mcr_chase
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[20:33] <SP9UOB-Tom> eneving All
[20:33] <SP9UOB-Tom> Evening ;-)
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[20:35] <Lunar_Lander> hello :)
[20:39] <Speedevil> SP9UOB-Tom: hellp
[20:39] <Speedevil> o
[20:39] <Upu> evening
[20:42] <SP9UOB-Tom> Speedevil: how can I help You ?
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[20:49] <SP9UOB-Tom> night all :-)
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[20:51] <edmoore> http://www.bbc.co.uk/news/uk-england-29684205
[20:51] <edmoore> whoops wrong window
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[20:51] <SP9UOB-Tom> https://www.youtube.com/watch?v=GcPYwPFZzAc
[20:52] <SP9UOB-Tom> ;-)
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[21:02] <ScottM85> evening
[21:05] <ScottM85> just wondering, my RTTY carrier shift isn't exactly 425, it's probably actually around 475. It doesn't seem to affect the tracking while I'm close but do you think it would as it got further away?
[21:05] <edmoore> not really
[21:05] <edmoore> it is what it is
[21:05] <edmoore> so long as the receivers are configured for the same spacing, you're ok
[21:05] <ScottM85> fldigi doesn't seem to have any problems tracking it but just thought I could probably get it better
[21:06] <edmoore> if being anal, you need slightly large receiver bandwidth to receiver a wider shift, which might suggest a slightly lower SNR
[21:06] <edmoore> but that's not really a thing with such tiny discrepancies and we're nowhere near channel limits anyway
[21:06] <edmoore> so, carry on as you are
[21:06] <ScottM85> OK thanks
[21:06] <edmoore> all good
[21:06] <mattbrejza> while we're being anal the shift should be a multiple of the baud rate
[21:07] <mattbrejza> but that matters less if youre at a few multiples of the baud rate
[21:07] <ScottM85> what's the purpose of that?
[21:07] <mattbrejza> it means the tones are 'orthogonal', so they dont interfere with each other
[21:09] <ScottM85> how do they interfere with each other when only one tone plays at a time? it goes high and low one at time right?
[21:10] <adamgreig> different frequencies are all orthogonal to each other always >.>
[21:10] <adamgreig> fourier transform decomposes into orthogonal basis functions etc
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[21:11] <mattbrejza> so the reciever looks for a signal at frequecy 1 and frequency 2, and whichever is larger defines 1/0, but if the signals are not orthognal then when transmitting one frequency some of its energy ends up in the other frequency's slot
[21:12] <mattbrejza> adamgreig: its for a similar reason that ofdm spaces at 1/Ts
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[21:12] <adamgreig> yes, but it's not because those tones become orthogonal :P
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[21:13] <mattbrejza> ok, orthogonal might not have been the correct word
[21:13] <ScottM85> ah right, so it's a timing thing? the previous tone not gone in time?
[21:13] <adamgreig> a bit like that
[21:14] <mattbrejza> if you look at the spectrum of a tone being turned on and off you see there is energy either side of the tone, but there are areas with no energy
[21:14] <craag> Isn't it that the harmonic of one tone can turn up where it would look for the other tone?
[21:14] <craag> harmonic is the wrong word
[21:14] <ScottM85> I might take a crack at getting it perfect, I've got a programmable resistor and I think I understand the voltage divider thingy
[21:14] <adamgreig> intermodulation product perhaps
[21:14] <mattbrejza> no harm if you cant get it exact though
[21:14] <adamgreig> ScottM85: you can just change the shift in dl-fldigi
[21:14] <adamgreig> it's customable
[21:14] <mattbrejza> i dont think its intermodulation
[21:14] <craag> for 50 baud, don't worry about it
[21:15] <craag> your spacing is many times baudrate
[21:15] <adamgreig> yea it's because you can't change from one tone to another very quickly because the channel itself is band limited
[21:15] <adamgreig> so in frequency you can't do a rectangle, it gets smoothed by the receiver response
[21:16] <adamgreig> which means your tones get wider as they get faster
[21:16] <ScottM85> ok, yeah, that works too
[21:16] <adamgreig> so 1/T is the minimum spacing. I think anything above that is fine though
[21:16] <adamgreig> doesn't have to be exact or a multiple
[21:16] <adamgreig> just not smaller
[21:16] <adamgreig> hmm
[21:17] <adamgreig> still not quite satisfied with that explanation because a very high bandwidth receiver would therefore in theory be better, which isn't true
[21:17] <mattbrejza> well the tx filter is non existant so there is plenty of energy past 1/Ts
[21:17] <adamgreig> there probably is a tx filter of sorts too, just way way above 50bd or 300bd
[21:19] <adamgreig> but I don't thiiiink it's the same as pulse shaping on ISI where you have to sample at just the right time (vv have just the right frequency shift)
[21:20] <mattbrejza> yea, i think thats different
[21:20] <mattbrejza> if you mix to baseband then integrate over a bit period the 'correct' frequency should integrate to something, while the other frequency should integrate to 0 if the condition is met
[21:21] <adamgreig> so your SPACE tone at say 1000Hz ends up spread out because of edge conditions, right
[21:22] <adamgreig> instead of being a pure spike in frequency it's a curvy bell shaped thing
[21:22] <mattbrejza> yea
[21:22] <adamgreig> because it's blipping on and off
[21:22] <adamgreig> and the width of that goes with the frequency it's being turned on and off
[21:22] <adamgreig> and if it's too wide, it will interfere with the MARK tone's frequency
[21:22] <mattbrejza> well because its a square wave it goes on infinitely
[21:23] <adamgreig> yea but a) not really a square wave b) negligable pretty fast
[21:23] <mattbrejza> but by spacing 1/Ts you put the other tone in the 'nulls' of the square wave
[21:23] <adamgreig> pretty sure my ntx2 can't do square waves in frequency
[21:23] <adamgreig> it has a LPF input on the modulator
[21:23] <mattbrejza> yea but the LPF is like 3kHz
[21:23] <adamgreig> yea
[21:23] <mattbrejza> and this isnt a square wave its a sqaure wave multiplied by a carrier
[21:24] <adamgreig> hmm yea I guess the nulls probs are at 1/T
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[21:25] <adamgreig> will they be
[21:25] <adamgreig> a T-wide rectangle has nulls at 2pi/T intervals
[21:25] <adamgreig> not 1/T
[21:26] <mattbrejza> a Ts signal has frequency 1/2T though
[21:27] <mattbrejza> http://i.imgur.com/Y6zRxSb.png (lovely template lol)
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[21:28] <adamgreig> lol radians
[21:28] <adamgreig> so yea
[21:29] <adamgreig> nulls from the fourier smearing of the modulating pulse are at 1/Ts from the carrier
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[21:29] <adamgreig> wfm
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[21:46] <Lunar_Lander> good night!
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[22:14] <qyx_> mhm, are saw filters bidirectional?
[22:14] <Speedevil> GEneraly, yes
[22:14] <Speedevil> IIRC
[22:15] <qyx_> because many pictures of internal structure suggest they aren't
[22:15] <qyx_> but i couldn't find any exact information
[22:16] <Speedevil> Read the datasheets
[22:16] <qyx_> i already did
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[22:25] <Ian_> mattbrejza how does the shift being required to be a multiple of the baud rate stack up historically with 50 and 75 baud, where shifts were variously 850Hz, 425Hz and 170Hz as receiver/transmitter stability improved over the years?
[22:26] <Ian_> In Accepted amateur terms of course. Oh and the 50 baud in Europe was actually 45.45Baud in the US
[22:26] <mattbrejza> well as shift is typcially quite a bit wider than baud, the difference will be minimal
[22:26] <mattbrejza> and people have flown 325 shift 300 baud fine
[22:26] <Ian_> Fair comment
[22:27] <mattbrejza> it just takes a few dB away from the SNR
[22:27] <mattbrejza> how many im not sure
[22:30] <fsphil> shouldn't be any problem with 325hz shift and 300 baud
[22:31] <mattbrejza> perhaps some simulations ar eneeded to work out what hte actual performance loss is
[22:31] <mattbrejza> but it wont be much
[22:32] <fsphil> though (quickly reading scrollback) you mean there might be some energy overlap because of the tone switching speed?
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[22:33] <mattbrejza> yea
[22:34] <fsphil> would GFSK help? I've read that it's slightly less efficient,
[22:35] <mattbrejza> well it wont help if you already have spaced everything at 1/T, but otherwise it might yea
[22:36] <fsphil> wouldn't spacing them apart at multiples of the baud rate not be the worst way to do it?
[22:36] <adamgreig> turns out, best way
[22:37] <adamgreig> sec
[22:37] <adamgreig> think a quick chart will explain
[22:39] <mattbrejza> http://i.imgur.com/Y6zRxSb.png might help
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[22:45] <g4zun> g4zun
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[22:50] <adamgreig> fsphil: mattbrejza: http://nbviewer.ipython.org/urls/agg.io/u/FSK%20Tone%20Spacing.ipynb
[22:50] <adamgreig> so we generate a 300Hz tone, then turn it on and off at 50bd
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[22:51] <fsphil> huh
[22:51] <fsphil> didn't expect that
[22:52] <adamgreig> http://nbviewer.ipython.org/urls/agg.io/u/FSK_Tone_Spacing.ipynb
[22:52] <adamgreig> updated ^
[22:52] <adamgreig> to include just the carrier and just the modulating signal's spectrum
[22:54] <fsphil> oh duh, highest frequency is sr / 2
[22:54] <fsphil> I was thinking it was sr
[22:54] <adamgreig> mm
[22:54] <adamgreig> though in this case all my frequency charts are manually set to 2kHz top
[22:54] <adamgreig> to make it easier to see
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[22:55] <fsphil> all makes sense now
[22:56] <adamgreig> science
[22:57] <fsphil> going well today. verified ohms law by accident earlier
[22:58] <adamgreig> hehe
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[22:58] <adamgreig> (in reality, the square wave i use to turn on/off the carrier is a lot smoother because the transmitter filters it)
[22:59] <adamgreig> (so this means its spectrum dies away quicker and is less spiky)
[22:59] <adamgreig> (but same general shape)
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[22:59] <fsphil> aye
[23:00] <fsphil> ipython is sweet
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[23:00] <adamgreig> it'd be a whole 'nother line of code to simulate the transmit filter :P
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[00:00] --- Mon Oct 20 2014