highaltitude.log.20150124

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[03:27] <estophilaeaeaeae> hei
[03:27] <estophilaeaeaeae> what is the time
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[07:22] <vk3pb> hi all again
[07:22] <vk3pb> my live mail had a meltdown
[07:22] <Darkside> use gmail?
[07:22] <Darkside> :P
[07:22] <vk3pb> is Andy's balloon still going?
[07:22] <Darkside> dunno
[07:22] <vk3pb> gmail is my backup
[07:22] <Darkside> !whereis ps-31
[07:22] <SpacenearUS> 03Darkside: 03PS-31 was over 03South Pacific Ocean 10(-49.974,155.937) at 038804 meters about 0321 minutes ago
[07:23] <vk3pb> hang on
[07:23] <vk3pb> one thing id ont understand
[07:23] <vk3pb> ps-31 transmits wspr and jt9
[07:23] <Darkside> yes
[07:23] <vk3pb> when or how is the altitude information sent?
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[07:24] <Darkside> vk3pb: i think he does something custom with the fields
[07:24] <vk3pb> thok
[07:24] <vk3pb> ok
[07:24] <Darkside> hence why you need his custom version of JT65/WSPR
[07:24] <vk3pb> ive got that
[07:24] <vk3pb> running at the moment
[07:25] <Darkside> k
[07:25] <vk3pb> ive yet to receivehis jt9 signal but wspr ive received
[07:25] <Darkside> mmk
[07:25] <vk3pb> and that just gave his grid code
[07:25] <Darkside> i havent tried yet
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[07:27] <Darkside> might see if it works in wine
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[07:54] <lz1dev> !hysplit add ps-31
[07:54] <SpacenearUS> 03lz1dev: Added 03ps-31 to defaults
[07:54] <lz1dev> !hysplit run ps-31
[07:54] <SpacenearUS> 03lz1dev: Your job has been added to the queue. Check in a few minutes
[07:56] <lz1dev> !hysplit ps-31
[07:56] <SpacenearUS> 03lz1dev: HYSPLIT for 03PS-31 - 12http://spacenear.us/tracker/hysplit_cache/150124-07_120915_PS31.gif
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[08:22] <SA6BSS> looks like ps-31 got a wspr spot through to Belgium
[08:22] <SA6BSS> and a couple to NA
[08:22] <Darkside> i havent heard it on JT9 yet
[08:23] <SA6BSS> whats your qth?
[08:23] <SA6BSS> VK?
[08:23] <Darkside> south australia
[08:23] <Darkside> VK5
[08:23] <SA6BSS> ok
[08:23] <Darkside> 20m should be about right
[08:23] <Darkside> but nothing yet
[08:23] <Darkside> ill have to try WSPR
[08:24] <SA6BSS> should be possible to run both simultaneously
[08:24] <Darkside> sure
[08:25] <Darkside> but i need to get it installed
[08:25] <Darkside> and the ubuntu PPA is broken
[08:25] <Darkside> and compiling WSPR is a right pain
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[08:25] <SA6BSS> ahh, curse of Linux
[08:25] <Darkside> might just run it under wine
[08:25] <Darkside> well
[08:25] <Darkside> its not the curse of linux
[08:25] <Darkside> its the curse of somoene using a crazy mix of C, python and FORTRAN
[08:26] <SA6BSS> hehe, understod :)
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[08:37] <SpacenearUS> New vehicle on the map: 03DL1NBR-11 - 12http://habhub.org/t/#!qm=All&q=DL1NBR-11
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[09:17] <guido___> !ping b-64
[09:17] <SpacenearUS> 03guido___: No contact from 03b-64
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[09:21] <edmoore> guido___, i admire your optimism
[09:21] <edmoore> keep a candle burning
[09:21] <guido___> ;-)
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[09:28] <Upu> it was removed yesterday
[09:28] <guido___> what?!!
[09:28] <Upu> from the map
[09:29] <guido___> terrible..
[09:29] <guido___> :-)
[09:30] <Upu> You can play it back from the database if you need to reminisce
[09:31] <guido___> yes it should be set in stone for historical purpose.. did b-64 actually break a record?
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[09:32] <Upu> many amateur records yes
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[09:45] <edmoore> well, distance and duration (2)
[09:45] <edmoore> i can't think of any others
[09:46] <lz1dev> highest number behind the callsign?
[09:46] <paul_HAB-P1> Damn gotta stop ordering uhf adapters after drinking...
[09:46] <lz1dev> oh wait there was b-66
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[09:48] <edmoore> plenty have launched more than 66 of some series of payload
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[09:48] <edmoore> though that might predate habitat
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[09:57] <Maxell> lz1dev: no XABEN would wil that though
[10:05] <edmoore> no Maxell
[10:05] <edmoore> see above
[10:06] <Maxell> ack
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[10:32] <SpacenearUS> New position from 03EDUPICDX1 after 032 days silence - 12http://habhub.org/t/#!qm=All&q=EDUPICDX1
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[10:51] <SpacenearUS> New vehicle on the map: 03PI_SKY_PLUS - 12http://habhub.org/t/#!qm=All&q=PI_SKY_PLUS
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[10:55] <jcoxon> PS-31 is speeding along
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[11:35] <OZ1SKY_Brian> hi
[11:38] <jcoxon> hey OZ1SKY_Brian
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[11:40] <GaryMortimer> Mornign all, I was wondering if there any launches in UK today I might try and decode via WebSDR down here in South Africa
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[11:41] <GaryMortimer> Have I just missed the one from Stroud?
[11:43] <Geoff-G8DHE-M> Nothing planned for today, worth getting the iCal feed from Habitat http://habitat.habhub.org/
[11:43] <jcoxon> GaryMortimer, no launches in the calender today
[11:44] <jcoxon> PS-31 though is south of new zealand on HF :-)
[11:44] <GaryMortimer> Thanks, looking. Hoping to loft some platforms here soon
[11:44] <GaryMortimer> Well not too soon
[11:44] <jcoxon> oh cool
[11:45] <jcoxon> there is a bit of balloon activity in south africa
[11:45] <jcoxon> usually by amateur radio operators
[11:50] <GaryMortimer> Yeah have read about a couple I like the non licence multi receiver route of 434. We have some great places to put some receivers and its all well jolly exciting
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[11:51] <jcoxon> awesome, well keep us updated
[11:54] <Reb-SM0ULC> Impressive transmissions ny PS31
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[11:58] <alxwntr> Hello all
[11:58] <alxwntr> could anyone recommend an Arduino data-logger?
[11:58] <alxwntr> there are several shields out there, but I was wondering if anyone had experience...
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[12:00] <alxwntr> I'd quite like to store any measured data rather than trust it all to the radio link - is that sensible?
[12:01] <Darkside> depends how important the data is
[12:01] <Darkside> the sd card doesnt work so well if th eradio link fails and you can't work out where it landed :-)
[12:01] <alxwntr> ah ok
[12:01] <Darkside> on that note, sd card is one way of saving data on an arduino
[12:01] <Darkside> there are som elibraries to save text files
[12:01] <Darkside> uses a lot of codespace though
[12:02] <alxwntr> sure - that was going to be another question - the code looks like it'll be fairly big as it is
[12:03] <alxwntr> so, do most people trust measurement of burst altitude to the transmitted packets?
[12:03] <alxwntr> it's just that I'm working on my first launch, so it would be nice to know for sure how it got on
[12:05] <Darkside> i'll let someon eelse answer that one
[12:05] <Darkside> i just transmit whatever the altitude was just before i start transmitting
[12:05] <Darkside> which is good enough
[12:06] <alxwntr> oh sure, but normally the radio link is always maintained one way or another all through a flight?
[12:07] <alxwntr> I guess I was wondering if it was a common thing for the link to be lost for periods here and there
[12:07] <alxwntr> if not, that makes it a lot easier and I won't bother with logging
[12:10] <Darkside> depends where you're flying right
[12:10] <Darkside> in the UK you'd probably be fine
[12:10] <alxwntr> ah, of course sorry
[12:10] <alxwntr> yes - probably Oxfordshire
[12:10] <Darkside> heh
[12:10] <Darkside> well there's a pretty big listener network in the UK
[12:11] <alxwntr> excellent
[12:11] <Darkside> doesn't mean you should rely on it
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[12:11] <Darkside> but if you ask nicely on the mailing list, i'm sure people will listen in
[12:11] <alxwntr> sorry for the basic questions
[12:11] <alxwntr> yes, the do seem like nice folk. :)
[12:11] <alxwntr> *they
[12:14] <alxwntr> I had another question about on-board heating
[12:14] <alxwntr> I saw a couple of pictures where the camera had fogged up
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[12:14] <alxwntr> apparently because of handwarmers or something
[12:15] <alxwntr> but I was wondering if I had a tiny heating element and a probe that switched it on to maintain the temp at, say -20C, would that cause any problems?
[12:15] <alxwntr> I thought it might mitigate freq shift, etc
[12:16] <alxwntr> good idea?
[12:23] <fsphil> foggy pics tend to be caused by a window between the camera and the outside world
[12:23] <fsphil> the condensation/ice forms on that
[12:23] <fsphil> not always though
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[12:25] <fsphil> happens a lot on telescopes. guess the warm scope vs. the very cold sky
[12:25] <edmoore> alxwntr, your intuition that constant temperature is helpful is correct, although from a frequency-shift point of view, the more normal technique now is to use TCXOs on the radio - temperature compensated crystal oscillators
[12:25] <edmoore> uses less energy than a heater to maintin a temp
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[12:27] <alxwntr> am I right in thinking that the NTX2B-FA has one of those?
[12:29] <Upu> correct it doe
[12:29] <Upu> s
[12:30] <alxwntr> hoorah
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[12:44] <infaddict> hi
[12:45] <infaddict> after some advice on Arduino boards. in very early stages of planning my project and looking at microcontroller options. anybody got any recommendations on boards please?
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[12:53] <infaddict> i notice mix of 3.3v and 5v plus varying amounts of serial connections through the range. i know i probably need to work out exactly what I'm connecting to it first.
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[12:58] <mfa298> lower voltage is likely to mean fewer batteries and may work with more parts (the prefered gps is 3v3 so if you have a 5v arduino you need a level converter for it)
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[13:08] <SpacenearUS> New vehicle on the map: 03PAYLOAD - 12http://habhub.org/t/#!qm=All&q=PAYLOAD
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[13:14] <SpacenearUS> New vehicle on the map: 03KP4AW-11 - 12http://habhub.org/t/#!qm=All&q=KP4AW-11
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[13:28] <infaddict> Thanks mfa298. the breakout GPS i found is 3.3 as you say...
[13:30] <Vaizki> I would go 3.3V parts throughout.. 5V is unnecessary
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[13:31] <mfa298> infaddict: hopefully that's from hab supplies
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[13:31] <infaddict> indeed
[13:31] <mfa298> excellent
[13:31] <infaddict> not sure if people buy the stock Arduino boards or the Arduino chips and make their own
[13:32] <infaddict> building up quite a shopping list from hab supplies ;-)
[13:32] <mfa298> a lot of people have bought bare atmega chips and make custom boards.
[13:32] <infaddict> but being new to all this, not gonna order till some kind folks on here review my choices
[13:32] <mfa298> however I think most have started off with one of the arduino boards and connected other things to it
[13:32] <infaddict> mmm i thought they might. i do prefer the thought of PCB with direct solder and less wires/plugs. less to disconnect under stress.
[13:33] <infaddict> so sounds like a 3.3V arduino based PCB is the way forward.
[13:34] <mfa298> this is the sort of thing people have made: http://ava.upuaut.net/?p=675
[13:34] <mfa298> but it usually takes a few attempts to get to that stage.
[13:36] <infaddict> yer i was thinking of getting a PCB design made for me, after proving on breadboard
[13:36] <infaddict> ok need to head out shopping (urgh), thanks for advice, appreciate it
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[13:42] <alxwntr> Is anyone able to offer me a hand with using the 'snprintf' funtion to form the broadcast sentences?
[13:42] <alxwntr> it doesn't seem to like several variable types...
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[13:45] <alxwntr> I'm trying to put in the Lat/Lon values, which come out of the TinyGPS++ library in various forms
[13:46] <alxwntr> I know snprintf doesn't like floats
[13:46] <alxwntr> so I have the whole degrees
[13:47] <alxwntr> and the billionths
[13:47] <alxwntr> but an integer up to a billion is too big for an int (I think), so it's a bit tricky
[13:47] <alxwntr> any ideas?
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[13:48] <mfa298> I think other people use dtostrf (or something like that) instead of snprintf
[13:48] <alxwntr> of right
[13:48] <alxwntr> thanks
[13:49] <mfa298> if you go down the route of seperating the float into two parts as integers be careful of zero padding the decimal part
[13:49] <alxwntr> I was going with the wiki, which is the first time I'd seen that function
[13:49] <alxwntr> yeah - that's what I was doing, but to get the precision, you need a very big int, no?
[13:49] <mfa298> leading zeros are important (but normally get trimmed off from integers as they don't matter there)
[13:50] <alxwntr> i.e. bigger than the int variable can handle
[13:50] <mfa298> that might depend on what level of presision you expect to get.
[13:50] <mfa298> there's little point providing the precision for mm accuracy if the gps is only accurate to 1m
[13:51] <alxwntr> how many decimal places on a degree is 1m?
[13:51] <mfa298> I'd suggest google will have the answer (that's all I'd be doing)
[13:51] <mfa298> but you probably don't need more than 4 or 5 dp from memory
[13:52] <alxwntr> because if an int can only handle 32,768 (or 64,535 if unsigned) that is only 5 dp
[13:52] <alxwntr> oh cool
[13:52] <alxwntr> that's fine then
[13:52] <alxwntr> :)
[13:52] <alxwntr> 4dp sorry
[13:53] <mfa298> similarly if the data has been stored as a float originally then you may have already lost some accuracy depending on how many bits were used to store it.
[13:55] <alxwntr> dtostrf seems like a much better way of doing things
[13:55] <alxwntr> thanks for that
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[14:49] <tweetBot> @AMSAT_UK: Phil Crump M0DNY Volunteer RF Engineering Consultant for #Southampton Uni UOS3 #Cubesat http://t.co/71dQTZwhNV #amsat #hamradio #hamr #ukhas
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[15:13] <SpacenearUS> New vehicle on the map: 03KF6RFX-3 - 12http://habhub.org/t/#!qm=All&q=KF6RFX-3
[15:13] <SpacenearUS> New vehicle on the map: 03KF6RFX-2 - 12http://habhub.org/t/#!qm=All&q=KF6RFX-2
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[15:19] <MarkIreland> Would have been nice if these guys mentioned UKHAS or the hard work from adamgreig / DanielRichman on the predictor!
[15:19] <MarkIreland> http://news.sky.com/story/1408090/final-frontier-sky-news-sends-cube-into-space
[15:19] <jcoxon> MarkIreland, is this send to space people?
[15:19] <MarkIreland> Yes
[15:19] <edmoore> they don't do ukhas
[15:19] <jcoxon> yeah i google searched their website for 'ukhas'
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[15:20] <jcoxon> 0 results
[15:20] <MarkIreland> Hmmm
[15:20] <edmoore> nor do they do space, though that doesn't seem to bother them
[15:20] <MarkIreland> Haha
[15:20] <MarkIreland> On the video he clearly shows the predictor
[15:23] <MarkIreland> I have a new job at the BBC so I have been pretty lacklustre on the hab stuff for a while! Need to get my act together lol
[15:23] <jcoxon> congrats on the new job
[15:24] <MarkIreland> Cheers, 1 hour each way commute is the killer at the mo though
[15:24] <jcoxon> drive or train?
[15:25] <MarkIreland> drive
[15:26] <jcoxon> know the feeling
[15:26] <jcoxon> oh well, got to earn to do hab
[15:27] <edmoore> or get work to pay for it
[15:28] <jcoxon> that as well
[15:28] <MarkIreland> Yeah they have spoke about it already which is good
[15:28] <Upu> they don't have a working radio tracker
[15:29] <Upu> congrats on the job Mark
[15:29] <MarkIreland> Cheers Upu.
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[15:37] <edmoore> wb
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[15:44] <SpacenearUS> New vehicle on the map: 03M0UPU-11 - 12http://habhub.org/t/#!qm=All&q=M0UPU-11
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[16:16] <SpacenearUS> New vehicle on the map: 03KD9AUK-11 - 12http://habhub.org/t/#!qm=All&q=KD9AUK-11
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[16:20] <hab1> Would someone be able to help me make sense of the airspace charts, I have not had any experience in this ( im looking at http://ukhas.org.uk/general:restrictions_legality)
[16:34] <Upu> Hi Hab1
[16:34] <Upu> are you ascertaining where you can launch from ?
[16:34] <hab1> yes, i just come across the page - i was researching launch locations
[16:35] <Upu> I wouldn't worry too much about the air charts, I mean if you're a mile from the end of Standsted you're not going to be able to launch from there
[16:35] <Upu> where abouts are you ?
[16:36] <hab1> i was thinking about launching from banbury, which is north from Oxford
[16:37] <edmoore> that will probably be ok
[16:37] <Upu> can't see that being an issue
[16:37] <Upu> only way to find out though
[16:37] <edmoore> the best thing to do is send in a notam when ready and see what happens
[16:37] <Upu> is to request a NOTAM
[16:37] <edmoore> i once helped with a luanch from uni parks in oxford, they had a stipulation to launch before 8am on the requestion day because of something at brize norton or kidlington
[16:38] <edmoore> requested*
[16:38] <edmoore> but banbury is clear of bot of those
[16:38] <edmoore> both*
[16:38] <Upu> you stolen my keyboard Ed ?
[16:38] <edmoore> must have
[16:38] <hab1> okay thank you guys
[16:38] <hab1> very true, only way to find out is to apply!
[16:39] <hab1> i just opened the PDF's and was abit taken back by the zones
[16:39] <hab1> so i ran here !
[16:39] <edmoore> yeah they're mostly jargon
[16:39] <edmoore> notam and see
[16:43] <edmoore> when are you hoping to launch hab1 ?
[16:43] <hab1> mid-march i believe
[16:44] <edmoore> and what sort of payload?
[16:51] <hab1> camera + various sensors, gps and gsm module
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[16:52] <daveake> hab1 No radio link ?
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[17:15] <Vaizki> how can PS-31 be received by multiple stations 3000+ km away..?
[17:17] <es5nhc> !payload PS-31
[17:17] <SpacenearUS> 03es5nhc: Can't find a flight doc matching your query
[17:17] <es5nhc> Aha... found info. Transponders are on shortwave, that's why
[17:19] <lz1dev> thats not helpful
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[17:30] <Vaizki> oh ok JT9
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[17:52] <Lunar_Lander> evening
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[18:31] <mclane_> hi lunar
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[18:41] <Lunar_Lander> hi mclane_
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[18:47] <mclane_> any plans for a launch in the near future?
[19:02] <infaddict> anybody know if its possible to replace the small antenna connector on a cheap SDR dongle with a female SMA instead? I've found a convertor lead but very thin so prefer to connect antenna direct to dongle via SMA.
[19:03] <edmoore> it is
[19:03] <edmoore> yes
[19:04] <edmoore> and people do exactly what you described for that reason you've identified
[19:04] <infaddict> thx edmoore - just checking as new to all this ;-)
[19:04] <edmoore> indeed! this is the place to get all the low-hanging fruit of community experience
[19:04] <infaddict> slowly building up my wish list of parts
[19:04] <infaddict> good fun
[19:05] <daveake> I wish I had a gadget to fix the weather
[19:05] <infaddict> ha
[19:06] <edmoore> ab aeroplane to a better country?
[19:06] <edmoore> an*
[19:08] <infaddict> sry another similar q. most mini mag antennas seem to have a BNC connection. Should this be replaced with SMA and if so, is it a cut and solder or conversion lead?
[19:09] <Upu> you can replace the bellinglee one and replace it with an SMA
[19:09] <infaddict> cheer Upu
[19:09] <Upu> I still have quite a few long SMA's from when I use to sell them modified
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[19:09] <Upu> got a pic of the inside of yours
[19:09] <Upu> ?
[19:10] <infaddict> nah still working out what I need to buy at the moment. only started this project yesterday so very early. but this group have been a big help so far. using habsupplies where i can.
[19:10] <edmoore> on the specific issue of your bnc magmount, i'd just buy a bnc-sma adaptor
[19:10] <edmoore> such things are always useful to own
[19:10] <Upu> yeah buttons on ebay too
[19:11] <infaddict> cool thx guys. as i'm a 1st timer, going for a cheap SDR dongle with habamp into a magmount for car and homemade yagi for direction finding. that sound ok?
[19:11] <edmoore> infact if you stick with this generally you'll want to have a few rf connector adaptors - N to bnc, bnc to sma, N to sma, in various gender combinations
[19:11] <edmoore> infaddict, sounds like just the thing
[19:12] <edmoore> you won't go wrong
[19:12] <infaddict> nice thx - i will step up to a funcube or more expensive radio if i get more into other stuff i guess (or dongle fails miserably haha)
[19:13] <SpacenearUS> New position from 03WB8ELK-1 after 037 days silence - 12http://habhub.org/t/#!qm=All&q=WB8ELK-1
[19:14] <SpacenearUS> New position from 03KJ4TDM-1 after 037 days silence - 12http://habhub.org/t/#!qm=All&q=KJ4TDM-1
[19:20] <SpacenearUS> New position from 03N4XWC-1 after 037 days silence - 12http://habhub.org/t/#!qm=All&q=N4XWC-1
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[19:41] <infaddict> any advice on home made yagi for payload finding in terms of boom length, number of elements etc? Guessing no more than about 1 metre long for practicality?
[19:41] <infaddict> Trying to find a decent online calculator to help with the design
[19:41] <Lunar_Lander> mclane_, working on it, yes
[19:45] <Geoff-G8DHE> infaddict, Check here http://widerimage.co.uk/docs/Mountain_Yagi_434_4Element.pdf
[19:45] <Lunar_Lander> and you?
[19:45] <Geoff-G8DHE> also ideas for changing the connectors on dongles http://360.g8dhe.net/hab_flights/HABAMP_and_DONGLE/
[19:48] <infaddict> Thanks Geoff! So that Yagi design will work ok for HAB payload detection at around 434Mhz?
[19:49] <Geoff-G8DHE> Yes no problem
[19:50] <mclane_> Lunar_Lander: we plan something for middle of February; however, due to the new regulation we may need to postpone it
[19:50] <Lunar_Lander> ah
[19:50] <Lunar_Lander> what is the new regulation?
[19:50] <infaddict> Cheers Geoff - nice link on the connectors too
[19:51] <mclane_> see here: https://groups.google.com/forum/?fromgroups#!topic/ukhas/eYI_Vee4fO8
[19:53] <Lunar_Lander> thanks
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[19:54] <SP9UOB-Tom> evening All
[19:56] <SP9UOB-Tom> anyone with hackvana experience ;-) ?
[19:56] <mclane_> yes: very good!
[19:56] <mclane_> Mitch is very helpfull
[19:56] <SP9UOB-Tom> on which layer should I draw restrict to not cover pads wih HAL finish (or make a gold immersion) - for Tag-connect
[19:56] <SP9UOB-Tom> connector
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[19:57] <mclane_> you should ask this directly in #hackvana
[19:59] <SP9UOB-Tom> mclane_: thanks
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[20:03] <OZ1SKY_Brian> Czesc tom
[20:03] <SP9UOB-Tom> hi Brian :-)
[20:04] <OZ1SKY_Brian> How is your house project comming along?
[20:04] <SP9UOB-Tom> i've just realiset that "hej" word in swedish has the same meaning in polish :-)
[20:05] <SP9UOB-Tom> OZ1SKY_Brian: floors done, doors done, bathrooms in progres :-)
[20:05] <OZ1SKY_Brian> And in danish too, spelled the same way too
[20:06] <OZ1SKY_Brian> Sounds very nice, so ready to move into soon?
[20:06] <SP9UOB-Tom> OZ1SKY_Brian: fireplace is almost ready, so we are about to move at the end of february
[20:07] <OZ1SKY_Brian> lovely, next to build antenna park HI
[20:07] <SP9UOB-Tom> then pneumatic 20 meter mast will be erected :-)
[20:07] <SP9UOB-Tom> good soviet military construction :-)
[20:07] <OZ1SKY_Brian> cool. still waiting for permit here.
[20:08] <OZ1SKY_Brian> If its soviet, it will last forever :-)
[20:08] <SP9UOB-Tom> i dont need the permit here it is my piece of eatrh ;-)
[20:08] <SP9UOB-Tom> earth
[20:09] <OZ1SKY_Brian> That must be nice to find such a place :-)
[20:14] <SP9UOB-Tom> OZ1SKY_Brian: 50 16.19'N 18 39.08'E
[20:16] <OZ1SKY_Brian> Thats going to be cold Tom, nothing there :-)
[20:16] <OZ1SKY_Brian> Oh wait, im wrong, i found your tower there Radiostacja widziana z Sikornika
[20:17] <SP9UOB-Tom> OZ1SKY_Brian: LOL thats 112 m tall woodden mast
[20:18] <OZ1SKY_Brian> Wood? wow
[20:18] <SP9UOB-Tom> OZ1SKY_Brian: that was the place where world war 2 was begun
[20:18] <SP9UOB-Tom> OZ1SKY_Brian: http://en.wikipedia.org/wiki/Gliwice_Radio_Tower
[20:18] <OZ1SKY_Brian> Really, interesting
[20:19] <SP9UOB-Tom> OZ1SKY_Brian: im going (with my ham radio friends) to re-run the antenna on 3.5 MHz
[20:21] <SP9UOB-Tom> OZ1SKY_Brian: thats us on the reconissance https://scontent-a.xx.fbcdn.net/hphotos-xfp1/t31.0-8/281018_553850057974094_334214262_o.jpg
[20:21] <OZ1SKY_Brian> I never heard this in school. "On 31 August 1939, the German SS staged a 'Polish' attack on Gleiwitz radio station, which was later used as justification for the Invasion of Poland"
[20:21] <OZ1SKY_Brian> Very nice, i hope to work you then, i got the polish antenna up now :-)
[20:22] <SP9UOB-Tom> OZ1SKY_Brian: thats nice
[20:22] <OZ1SKY_Brian> But the antenna seems to hear italy and spain better than poland :-)
[20:23] <SP9UOB-Tom> Lol :-)
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[20:32] <infaddict> silly question from a new guy. what is the difference between a 28ohm Yagi and 50ohm Yagi?
[20:33] <infaddict> apart from the ohms ;-)
[20:33] <Geoff-G8DHE> Its the impeadance matching, depending on the type of construction for the driven element
[20:33] <SP9UOB-Tom> infaddict: bandwidth and f/b ratio
[20:34] <SP9UOB-Tom> infaddict: also stacking
[20:34] <infaddict> is there any preference for HAB and hunting payloads?
[20:34] <Geoff-G8DHE> the impeadance will vary the cable is normally 50Ohm sometimes 75Ohm and its best if that aerial matches that, but in practice on Rx only don't worry about it!
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[20:35] <SP9UOB-Tom> infaddict: google for dk7zb - look for his antennas - there are lots of information about different antenna types
[20:35] <Delons> I've been intrigued by the Pico balloon flights that have been going on, specifically PS-30. A local ham club im in has launched HAB's before but are these pico ballons that travel this distance feasiable for the hobbiest?
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[20:36] <Geoff-G8DHE> There mostly launched by hobbiests!
[20:36] <infaddict> thanks Tom and Geoff. Yer its the dk7zb ones ive found and they come in 28 and 50 flavours
[20:36] <Geoff-G8DHE> see the B_xx series by Leo and the PS series
[20:36] <SpeedEvil> The key is finding the right material to make teh balloons from
[20:36] <SpeedEvil> Or finding a suitable stock balloon
[20:37] <SpeedEvil> >1 year is quite plausible@18km
[20:37] <Delons> We're planning on doing another public launch of a regular HAB in May, but they said to gather some details and we might try one of these instead.
[20:37] <Geoff-G8DHE> http://leobodnar.com/balloons/
[20:38] <SpeedEvil> An advantage is if the payload is at all times enclosed within a 2m sphere -you need no permission to launch
[20:38] <SpeedEvil> (though should still take care, and ensure you're not under a flightpath)
[20:39] <Delons> These things are really cool --- I might just do one my self....
[20:39] <Delons> When we launch our balloons we always file the proper paperwork and everything so...
[20:40] <Delons> Is HF the way to go for beacons?
[20:40] <Delons> I mean telemetry
[20:41] <Geoff-G8DHE> Not neccessarily, the B series all used 2m/70cms
[20:41] <mfa298> that 2m size restriction is for UK so if you're somewhere else you might have different rules.
[20:41] <SP9UOB-Tom> Delons: i did some HF telemetry
[20:41] <Delons> 2m wouldn't be trackable over the ocean..... which would be a shame, but it would be easier by the way it sounds......
[20:41] <Delons> Im in the US
[20:41] <Delons> This is really cool, I'm going to read up on them some more
[20:42] <SP9UOB-Tom> Delons: my ballon over Poland was received in Canada :-)
[20:42] <Delons> I really want to do this project --- 3-4 months in the air would be pretty cool - longer would be even cooler
[20:42] <Delons> what mode?
[20:42] <Geoff-G8DHE> Its only in the Southern hemisphere that you have mainly oceans, in the Northern Hemi. there are plenty of APRS gateways
[20:43] <SP9UOB-Tom> Delons: RTTY, second flight was domex 8
[20:43] <Delons> How much do the trasnsmitters normally cost for these?
[20:44] <SP9UOB-Tom> Delons: https://www.youtube.com/watch?v=pd0OU-LWoLA
[20:44] <Geoff-G8DHE> the B series of flights also kept a log of lat/long/time at lower resolution which it would send inbetween current position data so even when out of range it was able to relay its previous 5-10days worth of positions
[20:44] <Delons> Wow, that was a solid signal
[20:45] <SP9UOB-Tom> Delons: that was 1watt output @10 m band
[20:45] <Delons> And if one were to launch one would people help track them if it was HF?
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[20:45] <Delons> SP9UOB-Tom: how often did it xmit?
[20:46] <SP9UOB-Tom> Delons: every 2 minutes if i recall
[20:46] <SP9UOB-Tom> check the habitat logs :-0
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[20:46] <Geoff-G8DHE> You will need to have a HAM license of course
[20:46] <SP9UOB-Tom> Delons: im sute thah hams will help You track
[20:46] <SP9UOB-Tom> sure*
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[20:48] <Delons> If we were to go the 2m route would it be a transmitter you buy or something to build?
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[20:48] <Geoff-G8DHE> You would need to build from scratch, the weight of the Tx is very very low just 10-20 grams
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[20:49] <Geoff-G8DHE> Its not the sort of thing you will achieve on your first flight ;-)
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[20:50] <Geoff-G8DHE> Leo's B-64 (the first) to circumnavigate weighd in at 100grams and did 9 circumnavigations!!
[20:51] <Geoff-G8DHE> ha 11grams
[20:51] <Upu> was about to say :)
[20:51] <Geoff-G8DHE> Actually I wonder if its is still floating!
[20:52] <Delons> Last question :P Whats the estimated cost of each launch (minus the long amounts of time and testing for each flight)
[20:52] <SP9UOB-Tom> hi Anthony :-)
[20:52] <Geoff-G8DHE> Helium and balloon material I guess, solar cells, battery, chips, PCB
[20:53] <Upu> Hey Tom evening
[20:53] <edmoore> Delons, maybe £60 for a balloon, similar for hydrogen, a tank of petrol to chase, and you can put together a payload for about £100
[20:53] <edmoore> oh pico
[20:53] <edmoore> sorry
[20:53] <edmoore> balloon and hydrogen cheaper then
[20:53] <edmoore> no chasing
[20:53] <Upu> party helium £26
[20:53] <Upu> balloon £2
[20:54] <Upu> tracker depends really but £50 for a pico but that doesn't include the previous 14 versions to perfect it :)
[20:54] <SP9UOB-Tom> and you can make hydrogen by yourself :-)
[20:54] <Upu> yup
[20:54] <Geoff-G8DHE> by yourself is preferable when making Hydrogen ;-)
[20:55] <Delons> brb - be back with my IRC client - hate web chat
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[20:55] <Upu> oh he has an IRC client
[20:55] <Upu> he'll go far
[20:55] <Geoff-G8DHE> round the world ?
[20:55] <Upu> who knows :)
[20:55] <edmoore> hope it doesn't take 14 stabs to egt a flight computer design working :)
[20:56] <Upu> oh they all worked
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[20:56] <Upu> but I rarely changed more than 1 or 2 things each time
[20:56] <W1GIV> back, with my IRC client
[20:56] <Upu> wb]
[20:56] <Upu> ah American
[20:56] <W1GIV> (and a different nice)
[20:56] <W1GIV> nick*
[20:57] <W1GIV> Well, I'm going to work on a presentation for the club and a plan --- hopefully they like the idea. This sounds like a lot of fun and the trial and error part and the lots of testing seems like the best
[20:58] <Upu> You're in a bad place to launch, great for transatlantic attempts mind :)
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[20:59] <W1GIV> Worst case scenario it stays around here? or it comes down?
[20:59] <Upu> N2NXZ Jim is set up for 70cms in Rochester
[20:59] <Upu> http://predict.habhub.org/#!/uuid=19221ca2f3251a401c901b87a924ac91430e3cf0
[20:59] <Upu> Maybe ok
[21:00] <Upu> just have to pick a day when the winds are low
[21:00] <edmoore> new london
[21:00] <edmoore> didn't know there was such a place
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[21:01] <Upu> http://earth.nullschool.net/#current/wind/isobaric/70hPa/orthographic=-64.79,47.63,631
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[21:38] <Geoff-G8DHE> Upu is that LoRa board using RFM98 or the SX1276 devices ?
[21:39] <Upu> RFM98 which is an SX1276 or something
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[21:39] <Upu> its jsut the Semtec reference schematic
[21:39] <Upu> https://dl.dropboxusercontent.com/u/63720513/PDFS/LoRa-Reference-SchematicSX1276RF1JAS_e268v01a_sch.pdf
[21:39] <Geoff-G8DHE> Right OK just doing some reading up and was wondering which it was
[21:39] <Upu> if you're interested
[21:40] <Geoff-G8DHE> Yup, make sense
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[22:18] <SP9UOB-Tom> night all
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[22:18] <Geoff-G8DHE> gn
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[23:27] <SpacenearUS> New position from 03F6IPO-11 after 036 days silence - 12http://habhub.org/t/#!qm=All&q=F6IPO-11
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[00:00] --- Sun Jan 25 2015