highaltitude.log.20140623

[00:12] <malclocke> when sending rtty, do folks tend to leave a pause between each sentence, or do you just keep pumping them out?
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[00:18] <SpeedEvil> Both approaches have been used
[00:18] <SpeedEvil> Turning off the transmitter between sentances can save considerable power
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[00:45] <amell> McDonalds mission control?! :) http://spacecollege.org/isee3/video-nasa-tracks-zombie-spacecraft-from-office-space-inside-old-mcdonalds.html
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[02:25] Nick change: Willdude123 -> Flerb
[02:35] <DL7AD_> www.dl7ad.de/balloons/D-5/image/PICT0032.JPG will be launched on 28th June 09:00 UTC
[02:37] <DL7AD_> nick DL7AD
[02:37] Nick change: DL7AD_ -> DL7AD
[02:40] <ulfr> Cool
[02:57] <Reb-SM3ULC> morrn
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[03:04] <DL7AD> morning ulfr Reb-SM3ULC
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[03:31] <Reb-SM3ULC> DL7AD: looking forward to see the pics from your coming flight :)
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[05:28] <Maxell> LeoBodnar: wow, the last 80 packets send by m0xer-10 was digipeated first before it got igated
[05:28] <Maxell> WIDE2-1 is required over turkey
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[05:38] <Maxell> nice amell
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[07:04] <snelly> just released this: https://github.com/chrissnell/tnc-server
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[07:10] <ProSpectre> mornin gents
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[07:14] <ProSpectre> B-60 doin good
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[10:08] <Maxell> snelly: looks nice might even have a use case for this
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[10:32] <cuddykid> hi all - got some potentially good news on insurance front
[10:33] <SpeedEvil> Woo?
[10:33] <cuddykid> as Im sure most are aware, the situation at the moment is awful - the only people we could find to insure Fridays launch was J Bennett. This came at quite a high cost and a long process to obtain that insurance
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[10:34] <cuddykid> one of the senior people from J Bennett came along for Fridays flight & recovery
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[10:34] <cuddykid> after seeing exactly what goes on during a typical flight, hes now going back to his team to hopefully get the whole process sorted out for these balloon flights
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[10:35] <cuddykid> they seem keen to sort something out, so I hold a bit of hope that we can finally get something reasonable sorted out for flights :)
[10:36] <mfa298> that does sounds like it could be promissing
[10:36] <fsphil> or he was just being polite
[10:36] <mattbrejza> cuddykid: persumably your flights have no connection to your uni?
[10:36] <cuddykid> mattbrejza: correct
[10:38] <cuddykid> guess well have to see, but there is some hope at last
[10:39] <cuddykid> he pretty much agreed its just figure pulled out of thin air as theyve no real way of calculating the cost of insuring flights
[10:39] <cuddykid> i told him about the met office stats
[10:40] <SpeedEvil> cuddykid: Oooh!
[10:45] <daveake> Tell him to pull a price out of 1% air
[10:45] <daveake> See if that helps
[10:45] <daveake> re the met office stats, the ones that Chris Hillcox mentioned on the mailing list don't tally at all with what I remember being mentioned here ages ago
[10:46] <SpeedEvil> daveake: what was mentioned on the mailing list?
[10:48] <daveake> Just a sec .. might be on his blog not the mailing list
[10:50] <daveake> OK found it in his blog: "An article by the Daily Telegraph in 2010 revealed that the Met Office had paid out more than £25,000 in compensation since 2007 for damage caused by it’s radiosonde programme. The article,"
[10:51] <daveake> http://balloonnews.wordpress.com/2014/04/10/10-ways-that-a-high-altitude-balloon-flight-can-go-wrong/
[10:51] <daveake> Which is rather misleading
[10:52] <daveake> as it seems most of that was "Thousands more were paid out after Met Office staff were involved in road accidents."
[10:52] <craag> yep
[10:52] <craag> it was 200 quid a year on balloon-related damage iirc
[10:52] <craag> mainly greenhouse windows
[10:52] <daveake> yup that's what I remember
[10:52] <daveake> And that's what I quote in my standard response to risk assessment requests
[10:53] <cuddykid> yeah, thats what I told him
[10:53] <daveake> So, basically, we're more likely to have an accident on the way to recovering the balloon :p
[10:54] <SpeedEvil> Though I note that a #HA payload has hit a car
[10:54] <SpeedEvil> (did no damage though IIRC)
[10:55] <craag> That was Dave's teddy I think
[10:55] <daveake> Yes one of mine hit a car
[10:55] <daveake> Yup
[10:55] <craag> one of his many teddys
[10:55] <Darkside> i remembr that..
[10:55] <Darkside> i was there!
[10:55] <daveake> http://www.daveakerman.com/wp-content/uploads/2012/09/P1050268-e1346709067625-682x1024.jpg
[10:55] <daveake> That was hilarious
[10:56] <Darkside> knock on th edoor, step aside
[10:56] <SpeedEvil> hah
[10:57] <mfa298> this is probably the most useful quote in that telegraph article: Someone calls approximately once every six months saying that a radiosonde might have damaged their property, she said. To put this in context we launch around 3,000 a year.
[10:57] <daveake> Not every day that a teddy in spacesuit lands on your car
[10:58] <SpeedEvil> I read the FOIA request
[10:59] <SpeedEvil> It seemed a lot like many of these claims are likely to be 'a radiosonde landed next to my already broken greenhouse'
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[10:59] <daveake> yup
[10:59] <daveake> Wasn't one a (stationary) car windscreen?
[10:59] <daveake> Zero chance of that being true
[10:59] <SpeedEvil> https://www.whatdotheyknow.com/request/33885/response/87632/attach/html/3/0008950%20Taylor%20attach.pdf.html
[11:00] <daveake> Cheers very useful
[11:00] <SpeedEvil> And if your conservatory window smashes from a sonde - it's not going to stand up against a bird, or a severe storm
[11:01] <daveake> Yup. These things weigh how much? 200g ?
[11:01] <Maxell> < daveake> Yes one of mine hit a car
[11:01] <Maxell> < daveake> That was hilarious
[11:01] <Maxell> u wat
[11:01] <daveake> Parked car
[11:02] <Maxell> oh pfew
[11:02] <daveake> Owner thought it was great
[11:03] <daveake> The car was right in front of the front door to the house, so I stood in the way so he couldn't see the bear, knocked on the door, and when he answered I said "I seem to have landed this bear in your garden" and moved out of the way
[11:03] <Darkside> im standing to th eside trying not to piss myslf laughing
[11:03] <Maxell> daveake: 200g without shute is still going to hurt :p
[11:03] <daveake> lol
[11:04] <daveake> Well they do have a chute
[11:04] <fsphil> very good chute apparently
[11:04] <daveake> Yup I've got some here
[11:04] <Darkside> th ones around here have chutes *within* the balloons
[11:04] <Darkside> little plastic jobbis
[11:04] <Darkside> jobbies*
[11:05] <Jess--> I suppose it cuts down on the chances of the chute tangling during flight a little bit
[11:05] <fsphil> does make an unclean burst a worse problem
[11:06] <fsphil> guarantees the chute gets tangled
[11:06] <Darkside> yeah, but the met balloons are filled pretty routinly
[11:06] <Darkside> and in this case it was on an automatic launcher
[11:06] <fsphil> they're tiny balloons too
[11:06] <Darkside> so thres some guarantee its going to burst in a particular way
[11:06] <Jess--> my last payload came down with the chute very neatly tied up in the cord between the balloon and payload, totally useless
[11:06] <fsphil> the local one only gets to 24km
[11:07] <Maxell> https://balloonnews.wordpress.com/2014/04/10/10-ways-that-a-high-altitude-balloon-flight-can-go-wrong/ Adams said, who did not forecast the balloons flight path said  The balloon could have traveled anywhere from 40 to 250 miles away.
[11:07] <Maxell> lol
[11:08] <fsphil> oh dear
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[11:08] <Maxell> Deserved it?
[11:08] <SpeedEvil> Better tell Leo.
[11:08] <SpeedEvil> They only go 250 miles. That will be a blow.
[11:09] <fsphil> he'll have to quit now
[11:10] <Darkside> "Or if you operate it at a time of day when no one is listening then nobody will record the tracker location."
[11:10] <Darkside> uh
[11:10] <Darkside> *you* should be listening
[11:10] <Darkside> "Similarly, if your radio tracker lands in hilly terrain then the signal will not get out for listeners to receive"
[11:10] <fsphil> you'd think that
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[11:10] <Darkside> if *you* are listneing, you'd hear it down to a few km, and at least have some better idea of where to search
[11:10] <fsphil> seems we've all been doing it wrong
[11:11] <SpeedEvil> To be fair - several years ago...
[11:11] <SpeedEvil> I mean - I wouldn't say that launches are entirely routine - but if you read the FAQ, most of the 'don't do this' things have happened to someone
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[11:20] <Maxell> I lol'd quite hard when the man behind jnoss1 (collegue of hackerspace participant) came up to me with "hey you are the guy that did a HAB before right? I'm going to launch one tomorrow!"
[11:20] <Maxell> And I'm like, did you mail the ukhas mailing list?
[11:20] <Maxell> Uh no I just made the flight doc last year
[11:21] <Maxell> Also chase car had very limited RX/
[11:21] <Maxell> last two packets from RevSpace and PE2G not chase car itself etc
[11:21] <Maxell> Also gps fix issues :P
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[11:26] <Jess--> I think I've had most in the list, underinflation leading to a landing in the north sea, + 2 trackers not in flight mode (that launch was doomed I tell ya)
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[11:26] <Jess--> had to launch an hour early due to a change in schedule for the BBMF
[11:27] <Jess--> coding error leading to 1mw tx instead of 10mw
[11:27] <Laurenceb_> https://ready.arl.noaa.gov/hypubout/145345_trj001.gif
[11:27] <Jess--> and chute failure causing batteries to disconnect on impact (luckily they reconnected)
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[11:30] <daveake> That can happen with a full open chute ... batteries in holders are very prone to that
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[11:34] <Jess--> maybe I should document my flights as a what not to do ;)
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[11:35] <daveake> I think we could all contribute to that :/
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[12:04] <Maxell> Jess--: sounds fcked uo yo :p
[12:04] <Maxell> up
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[13:59] <Laurenceb_> B-60 heading out of range :(
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[14:04] <fsphil> heading into the (radio) dark
[14:06] <LZ1DEV> of the moon (earth)
[14:06] <Reb-SM3ULC> Laurenceb_: and back into the disc about hf-comms.. :)
[14:06] <fsphil> that nearly works
[14:06] <Laurenceb_> heh
[14:06] <Laurenceb_> WSPR is needed
[14:06] <fsphil> wspr combined with TOA
[14:06] <Reb-SM3ULC> HAB -> moonbounce, would be something...
[14:07] <Laurenceb_> its possible to stick a WSPR antenni onto a pico
[14:07] <Laurenceb_> using inductive loading
[14:09] <Laurenceb_> but everyone is using 20m
[14:09] <Laurenceb_> http://wsprnet.org/drupal/wsprnet/stats
[14:09] <Laurenceb_> which is annoying
[14:11] <Reb-SM3ULC> at least an existing infrastructure
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[14:12] <Reb-SM3ULC> very easy to jioin if one want to join and support
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[14:16] <Maxell> Laurenceb_: whats wrong with 20 meters?
[14:17] <mattbrejza> a 20m antenna wont fit within the 2m limit
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[14:17] <craag> * a decent 20 antenna won't fit
[14:17] <Laurenceb_> yeah, 10m is a lot nicer to build
[14:18] <Laurenceb_> the inductors start to get heavy at 20m
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[14:19] <Maxell> xyeah but at 10 meters allmost all hf magic is gone.
[14:19] <Maxell> Leo has done hf flights before right?
[14:21] <Laurenceb_> yeah
[14:21] <Laurenceb_> but 27mhz
[14:21] <Maxell> 10 meter bands is quite the same as the 11 meter band
[14:22] <Maxell> (condition wise)
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[14:34] <Maxell> Laurenceb_: on 27mhz is was still line of sight right?
[14:37] <Laurenceb_> yes
[14:37] <fsphil> the noise floor on 27mhz is much higher
[14:37] <mfa298> 27Mhz can have more propogation but it's going to vary with time (and 10mW might make skip interesting)
[14:38] <fsphil> last time I tried receiving somethign on the HF ISM bands they where totally drowned out by very powerful data signals
[14:38] <Maxell> well that would be true fsphil some neighbour here has power line comminucations and completly wipes out the 11 meter band
[14:38] <fsphil> thats horrible
[14:38] <Maxell> all of HF basicly
[14:39] <craag> Yeah was it APEX that tried a beacon on 40m?
[14:39] <Maxell> and on the ham bands they "notch" it.
[14:39] <fsphil> something similar happening here, except I think it's a faulty PSU nearby
[14:39] <craag> 10 minutes after launch we were hit with a 50KHz wide data signal
[14:39] <mfa298> most powerline adapters have some filters for the ham bands (but probably not for ISM or other interesting HF bands)
[14:39] <craag> went away an hour after it landed
[14:39] <fsphil> craag: that might have been the one
[14:39] <mattbrejza> that was astra
[14:39] <craag> Ah yes
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[14:39] <fsphil> or that one
[14:39] <craag> We were up on that roof
[14:40] <craag> with a 40m 1/4 wave
[14:40] <mattbrejza> i also think i forgot the conterpoise which didnt help...
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[14:40] <Maxell> mfa298: well yes but this filter won't be 60dB I guess
[14:40] <craag> mattbrejza: The rails should have worked better tbh
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[14:41] <craag> almost a ground plane
[14:41] <mattbrejza> as in balloon side
[14:41] <mfa298> if the neighbours powerline signals are that strong maybe you should try and get a matching unit and see if you can use their internet.
[14:41] <craag> ah
[14:41] <craag> I see
[14:41] <fsphil> hehe
[14:41] <mattbrejza> i put a 27MHz one up too but it was mid week so noone listened
[14:42] <Maxell> mfa298: those things do have some sort of linking with encryption going on :P
[14:42] <fsphil> they're basically wifi
[14:42] <mattbrejza> didnt seem worth it over 434 in the end
[14:42] <Maxell> mfa298: would be better to put some hf straight into the mains
[14:42] <Laurenceb_> 20m seems to regularly go round the world with WSPR and 10mW
[14:42] <mfa298> and I think the encryption (if enabled) is basicly wep (so not much of a barrier)
[14:43] <Laurenceb_> impressive reception
[14:43] <Laurenceb_> half way across the caspian
[14:43] <fsphil> I got received in australia with about 80mw
[14:44] <mfa298> I received an australian ham station one evening when mobile on the 2/70 magmount
[14:44] <fsphil> I wonder if there is a small increase in signal strength on the exact opposite side of the planet
[14:44] <fsphil> antipode
[14:44] <mfa298> it was also noticable when we drove past one of the telephone exchanges - the noise floor went right up briefly)
[14:45] <daveake> My first launch I had to drive past the local country show. Horrible RF noise there
[14:45] <fsphil> s/RF//
[14:45] <Maxell> mfa298: hf on magmount right
[14:45] <daveake> fsphil Also true :/
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[14:47] <mfa298> Maxell: yes, I think it was on 20m but with a 2/70 magmount - so not much good to tx on - and as that was with the 817 and no ATU I doubt much power would have got out if I tried to tx
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[14:58] <Maxell> More M0XER-10 packets coming in
[15:00] <Maxell> RZ6HSP at it again far behond horizon
[15:08] <Laurenceb_> https://ready.arl.noaa.gov/hypubout/152975_trj001.gif
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[15:10] <Laurenceb_> at least 4 days until more APRS
[15:10] <Laurenceb_> and risk of rain over japan
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[15:18] <Maxell> Laurenceb_: sucks and sucks :(
[15:19] <Laurenceb_> if it heads north over siberia there is some aprs
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[16:45] <ike> Hi guys
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[16:46] <ike> so my VHF module from china arrived
[16:46] <ike> and i'm looking for small 145MHz antenna
[16:46] <ike> any suggestions
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[16:47] <ike> 50cm is way too big for me
[16:48] <SpeedEvil> ?
[16:48] <ike> are there compact and good 145MHz antennas
[16:49] <Laurenceb_> dude how small is your house?!
[16:50] <myself> *snerk*
[16:51] <ike> it's not for house
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[16:53] <SpeedEvil> What's it for
[16:54] <mattbrejza> wanting a small but good antenna and picking a low frequency doesnt seem like a good mix
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[16:59] <ike> SpeedEvil for something like balloon
[16:59] <ike> mattbrejza -3dbi is OK
[17:00] <SpeedEvil> 50cm bare wire
[17:00] <SpeedEvil> with a loop on the end
[17:01] <ike> can we have a deal at 10cm?
[17:01] <ike> I know that I'm bending physics here
[17:02] <ike> but I know that is doable
[17:02] <ike> and there is one more thing
[17:02] <mattbrejza> do you have an RF anechoic chamber to hand?
[17:03] <ike> it should not detune if it's near human hand
[17:03] <ike> I don't have any RF equipment
[17:04] <LeoBodnar> lucky
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[17:08] <ike> can you recommend me good APRS project for atmega328 or msp430g2553?
[17:08] <ike> I'm looking for TX only
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[17:10] <LeoBodnar> transmit what?
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[17:11] <ike> GPS data
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[17:11] <ike> I would like to build GPS watch that send data via APRS
[17:11] <ike> there are GPRS watches
[17:12] <ike> but I want APRS one
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[17:12] <mattbrejza> just look at the spec?
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[17:12] <mattbrejza> its not much more than rtty, you just need to generate the 1200/2200 tones instead
[17:12] <LeoBodnar> you want to send GPS time data over APRS?
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[17:13] <ike> GPS long-lat over APRS
[17:13] <mattbrejza> also how big is your wrist?
[17:13] <ike> watch size APRS tracker
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[17:13] <LeoBodnar> why APRS?
[17:13] <LeoBodnar> send it via Bluetooth
[17:13] <bertrik> maybe you can do it with an RFMxx-like module to do all the RF stuff, not sure if they go that low though
[17:13] <LeoBodnar> BT LE
[17:14] <ike> big enough for 1000mAh nokia phone battery
[17:14] <LeoBodnar> what are you trying to achieve?
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[17:15] <ike> stand alone APRS tracker with watch size
[17:15] <LeoBodnar> that guaranteed fail
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[17:15] <ike> bertrik I get 30dbm RF module
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[17:15] <mattbrejza> is this incase you lose your wrist and need to track it?
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[17:16] <jonsowman> clearly target application is cat
[17:16] <ike> LeoBodnar I have trouble with antenna, you are right, but why would it fail?
[17:16] <daveake> job for an arm
[17:16] <LeoBodnar> strap this to your hand: http://www.yaesu.com/indexVS.cfm?cmd=DisplayProducts&ProdCatID=111&encProdID=64C913CDBC183621AAA39980149EA8C6
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[17:16] <ike> LeoBodnar that is overkill
[17:16] <mattbrejza> poor cat
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[17:17] <mattbrejza> lol arms
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[17:17] <jonsowman> I think you misunderstood when we said "arm processor"
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[17:18] <daveake> Just needs to be digital
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[17:19] <ike> so ... what do you use for APRS antennas on your balloons when you don't fly over UK?
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[17:19] <LeoBodnar> 2m dipole
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[17:20] <ike> and another thing It's 50ohm output and I don't what balluns
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[17:21] <ike> I was looking for something like one strap is some induction and other strap as ground for antenna
[17:22] <LeoBodnar> good idea
[17:23] <LeoBodnar> there is a special antenna type just for your application
[17:24] <ike> what type?
[17:24] <ike> inverted F are small
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[17:25] <ike> and there are ceramic antennas that are small but I don't think that there are made for 145MHz
[17:25] <LeoBodnar> you can fill thin conductive metal tube with mercury.
[17:25] <LeoBodnar> the results are *AMAZING*!
[17:25] <LeoBodnar> it's a well hidden secret
[17:26] <ike> yea right
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[17:27] <jonsowman> Geoff-G8DHE-M: sort connection out please
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[17:28] <ike> LeoBodnar paper clip is better antenna than tube with mercury
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[17:29] <ike> http://www.gizmag.com/go/5259/
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[17:29] <LeoBodnar> http://www.thenakedscientists.com/forum/index.php?topic=14129.5;wap2
[17:30] <LeoBodnar> "he got amazing signal that he could watch channels from poland, for that you would need a very high gain dish in a very good spot, he used an old soviet roof top antenna, but the fun didnt last long, he said that in about two hours a military "Uazik" came there, told him to take antenna off the roof, and warned him if he does that again he will be put in prison, they basically said that it was messing up all their signals..."
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[17:30] <jonsowman> Geoff-G8DHE-M: please!
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[17:31] <mattbrejza> lol
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[17:39] <fsphil> oh now everyone's at it
[17:39] <daveake> *daveake has quit (Having food)
[17:39] <jonsowman> I give up
[17:39] Action: jonsowman bans everyone
[17:39] <daveake> :)
[17:39] <jonsowman> ahh, silence
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[17:40] <ike> so ... TI have one 2m antenna that doesn't look big http://www.ti.com/graphics/tool/CC-Antenna-DK.jpg
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[17:40] <ike> but I don't know how good it is
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[18:04] <pnephos> Hello. Does anyone know how to calculate the range of a RF transmitter? I would like to know whether a transmitter can be suitable for my project or not.
[18:04] <Upu> which trasmitter and are you launching it on a balloon ?
[18:05] <pnephos> Well, I was speaking in general terms (calculate the range for any transmitter), but I will use the CC1101 one.
[18:06] <pnephos> And yes, I am launching it on a balloon. ;)
[18:07] <Upu> at altitude quite a fair way
[18:07] <Upu> I need to afk but 10mW does 500miles @ 38km
[18:07] <Upu> 500km
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[18:12] <pnephos> That's perfect for a balloon flight, then. Is the altitude range related to the mW of the transmitter?
[18:14] <DL7AD_mobile> No. You will receive up to the horizon.
[18:39] <Maxell> pnephos: in the habbing world having line of sight means recieving data, basicly.
[18:41] <pnephos> Maxell: Thank you. It's my first HAB project and I have still a lot to learn. ;)
[18:43] <Maxell> Learning. Something you will do a lot in the near future :P
[18:54] <chrisstubbs> Upu, did you use a flashing LED module on the flight on your youtube channel?
[18:56] <Upu> https://www.youtube.com/watch?v=uArr8e4gTes
[18:56] <Upu> Leos
[18:56] <chrisstubbs> Ah yes I knew I saw him and dave in a video somewhere
[18:57] <chrisstubbs> LeoBodnar, did you use a module?
[18:57] Action: mfa298 reads scrollback and thinks ike should probably read some of the HAM stuff from doing the tests again - or look at going up the license levels to learn a bit more about rf and antenna propogation.
[19:00] <mfa298> pnephos: generally the range will be affected by data rate and power. So for a higher data rate you need more power for a range. In general we use low powers (often it's a fairly low legal limit thats allowed without a license) so also a low data rate (50baud and 300 baud are common) the distances on most radio modules are usually based on much higher data rates and also at ground level both of which will impact the distance.
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[19:02] <LeoBodnar> Dave and Upu used two of the modules i made on their two balloons
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[19:02] <chrisstubbs> Ah yes sorry I remember the ones from the conference yes
[19:03] <LeoBodnar> did i bring one in? if so it would be the same
[19:04] <chrisstubbs> I think so, if not I remember seeing one at some point. Just found it on your website
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[19:52] <amell> chrisstubbs, are you around tomorrow/weds? Looks like we have a launch window.
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[20:18] <chrisstubbs> amell tomorrow afternoon yes, wednesday not at all i'm afraid
[20:18] <chrisstubbs> what are you thinking?
[20:19] <chrisstubbs> flying south for the summer? ;)
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[20:58] <malgar> mclane_: ping
[20:58] <mclane_> pong
[20:59] <malgar> mclane_: query
[20:59] <mclane_> yes, go ahead
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[21:59] <DL7AD_mobile> Evening
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[22:00] <malclocke> morning ;)
[22:00] <DL7AD_mobile> Not yet
[22:00] <DL7AD_mobile> Morn ^^
[22:01] <malclocke> well, it's very much morning here I'm afraid
[22:01] <fsphil> another hour here still
[22:03] <malclocke> coffee is starting to kick in though ...
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[22:08] <Laurenceb__> https://ready.arl.noaa.gov/hypubout/163555_trj001.gif
[22:10] <Laurenceb__> almost all hitting aprs
[22:10] <DL7AD_mobile> Weeeee
[22:10] <Lunar_Lander> good night everyone :)
[22:11] <DL7AD_mobile> Gn
[22:11] <DL7AD_mobile> Still driving train
[22:11] <DL7AD_mobile> Well... not myself
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[22:17] <fsphil> chase train
[22:17] <fsphil> that would be quite restrictive
[22:19] <Laurenceb__> i dont know
[22:19] <Laurenceb__> get on the trans siberian
[22:20] <Laurenceb__> looks like B-60 might hit aprs from Abakan
[22:20] <Laurenceb__> tomorrow morning
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[22:21] <Laurenceb__> the balloon to japan was received from there
[22:21] <DL7AD_mobile> The problem of the chassing software is, that it doea not support a train symbol ;)
[22:22] <fsphil> this can be fixed :)
[22:22] <Laurenceb__> heh
[22:22] <Laurenceb__> i thought of a use for picoballoons
[22:23] <Laurenceb__> launch three at the same time
[22:23] <Laurenceb__> then they will drift apart
[22:23] <aadamson> Laurenceb__, PM
[22:23] <Laurenceb__> whilst they are still in range of one another, provided they can be networked somehow, they could form a passive synthetic aperture sonar
[22:23] <Laurenceb__> to map out audio noise on the ground
[22:24] <fsphil> would there be much audio at 7km?
[22:25] <fsphil> other than the odd passing plane
[22:25] <Laurenceb__> yes
[22:25] <Laurenceb__> in fact you can hear a car on the ground with a decent microphone
[22:26] <Laurenceb__> the only annoyance is >500hz is heavily attenuated
[22:26] <Laurenceb__> so you need a long baseline due to the wavlength
[22:27] <Laurenceb__> i was wondering about a 2m long microphone boom, but not long enough at ~300hz :(
[22:27] <Laurenceb__> a cluster is annoying to network
[22:28] <Laurenceb__> but potentially it could be awesome
[22:28] <Laurenceb__> 2d visualisations of audio on the ground
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[22:56] <mikestir> ping aadamson
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[23:20] <aadamson> ah, missed him
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[23:32] <arko> https://www.youtube.com/watch?v=b_ILDFp5DGA&t=82s
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[23:48] <LZ1DEV> http://i.imgur.com/OIAgSUz.jpg
[23:53] <DL7AD> LZ1DEV: agree
[00:00] --- Tue Jun 24 2014