highaltitude.log.20150605

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[03:45] <SpacenearUS> New vehicle on the map: 03Sa0bsv_chase - 12http://tracker.habhub.org/#!qm=All&q=Sa0bsv_chase
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[05:35] <SpacenearUS> New position from 03DC2EH-11 after 03a day silence - 12http://tracker.habhub.org/#!qm=All&q=DC2EH-11
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[07:03] <Aernout> hi
[07:05] <Aernout> Flight GKC Thermal bottle test (payload GKCV3B is cancelled today.
[07:06] <Aernout> I posted this message on UKHAS mailinglist aswell
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[07:29] <Maxell> :(
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[08:05] <infaddict> Morning all. Friday random survey... what kit (receiver, computer etc) do you use for mobile HAB tracking?
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[08:07] <fsphil> diviner
[08:07] <infaddict> damn didnt think of that approach fsphil!
[08:07] <fsphil> :)
[08:07] <infaddict> Probably get better results than my recent long range test haha
[08:07] <daveake> Label on payload + frozen lake + blind luck
[08:07] <fsphil> laptop, SDR dongle (previously FCD, probably airspy now)
[08:08] <fsphil> backup physical radio with full batteries
[08:08] <fsphil> charger for laptop
[08:08] <fsphil> or inverter
[08:08] <fsphil> long pole for inevitible tree landing
[08:08] <fsphil> +a
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[08:08] <daveake> Main: car pc + touchscreen + Yaesu 817. Backup: Netbook with car charger, ICOM scanner
[08:08] <daveake> Actually shoudl do a wiki on this
[08:09] <infaddict> thx. i am familiar with computer based radio (e.g. dongle) a lot more than physical radio. i like seeing the waterfall. so deciding whether to stick with better dongle or get real receiver. perhaps i should have both really.
[08:09] <fsphil> yea
[08:09] <fsphil> you still have a waterfall with a traditional radio
[08:09] <daveake> If in doubt, take it
[08:09] <infaddict> yer daveake that would help new guys like me. the parts are spread around the wiki on different models, but perhaps a single page on tracking hardware combinations
[08:09] <fsphil> just not as wide
[08:09] <SpacenearUS> New vehicle on the map: 03Broadway_chase - 12http://tracker.habhub.org/#!qm=All&q=Broadway_chase
[08:09] <fsphil> 3khz does seem very limiting once you've used an sdr :)
[08:09] <infaddict> so this is where my knowledge is really lacking. how does a handhelf receiver show the waterfall?
[08:10] <daveake> Sooner or later everything will fail. On one chase even the car sat nav got lost, we had no mobile coverage so we needed a paper map to figure out where we were
[08:10] <fsphil> infaddict: dl-fldigi does
[08:10] <infaddict> right
[08:10] <SpacenearUS> New vehicle on the map: 03Broadway2_chase - 12http://tracker.habhub.org/#!qm=All&q=Broadway2_chase
[08:10] <infaddict> so you can see whatever range you are feeding to fldigi
[08:10] <fsphil> you use your ears to initially tune your radio
[08:10] <fsphil> which you'd hopefully have done at the launch site
[08:10] <infaddict> and to deal with drift, use ears (or will it scan and lock)?
[08:11] <daveake> yeah, just don't forget what frequency the payload was at when you launched
[08:11] <fsphil> some radios can be controlled by fldigi
[08:11] <fsphil> and it has an option to retune if it drifts too far
[08:11] <daveake> It's easy to tune around and lose track of what you had it set to originally
[08:11] <daveake> yeah must get round to doing the autotune thing in the car
[08:11] <daveake> I have the lead
[08:12] <fsphil> yes it's one less thing to worry about
[08:12] <infaddict> is that some sort of serial lead?
[08:12] <fsphil> basically
[08:13] <infaddict> i'm watching some entry level receivers on Ebay and hope to pick one up sub £100
[08:14] <fsphil> make sure it can receive SSB
[08:14] <mfa298> I suspect very few (if any) of the suitable sub £100 can be controlled in a useful way.
[08:15] <infaddict> fsphil: yes they can all receive SSB and the 70cm band. quite old models hence the cheap price.
[08:15] <fsphil> cool
[08:15] <fsphil> few handhelds can
[08:15] <infaddict> e.g. Yupiteru MVT-7100
[08:15] <infaddict> and an Icom IC-R20
[08:15] <mfa298> a suitable handheld, mobile radio (FT817) can be good for the final trek through the woods, much easier to carry than a laptop + dongle + antenna setup
[08:15] <infaddict> i *think* they do everything i need
[08:15] <daveake> R20 for sub £100??
[08:16] <infaddict> ssshh dont tell everybody
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[08:16] <infaddict> likely to rise as auction ends of course
[08:16] <fsphil> hah
[08:16] <daveake> yeah that won't go for <£100
[08:16] <mfa298> MVT-7100 would probably be sub £100, I think mine was ~£70 a couple of years ago
[08:16] <infaddict> so i have a cheap RTL-SDR dongle which seems to work great at short range
[08:17] <daveake> prices seem to have crept up
[08:17] <Vaizki> I was also wondering why so few handhelds have SSB..
[08:17] <daveake> however sometimes they go for less
[08:17] <daveake> specially if there's a fault
[08:17] <daveake> patience is key
[08:17] <fsphil> thinking of selling my ft790 mk 2
[08:17] <Vaizki> well, I got a few battery powered radios now with 70cm and SSB
[08:17] <infaddict> interestingly, with the HabAmp in my rig I do start to see small amounts of local stuff in the waterfall.
[08:17] <daveake> 790 is lovely
[08:17] <fsphil> it is
[08:18] <fsphil> but it doesn't get much use anymore
[08:18] <fsphil> though the batteries last forever
[08:18] <daveake> indeed
[08:18] <fsphil> compared to the 817
[08:18] <mfa298> my experience is that some of the handheld radios aren't much more sensitive than the dongles. The Amateur transcievers are much better and on a par with the FCD Pro+ (and I assume similar priced SDR dongles)
[08:18] <Vaizki> funny thing is, getting a portable spectrum analyzer that demodulates am, fm and ssb was cheaper than getting a handheld scanner with SSB.. :)
[08:18] <daveake> yeah I'll go with that mfa298
[08:19] <Vaizki> and the specan was new old stock, unopened box
[08:19] <infaddict> ok mfa298 so would i be better buying a AirSpy than a handheld receiver then?
[08:19] <infaddict> or FCDP+ or similar
[08:19] <mfa298> both :)
[08:19] <Vaizki> I think mfa298 means your RTL dongle should be ok or go for a FT-817ND
[08:20] <Vaizki> or similar transceiver instead of a scanner receiver
[08:20] <infaddict> yer well problem is the RTL dongle isnt working outside of 300 metres range.
[08:20] <infaddict> i've proved my PCB and antenna on payload are fine
[08:20] <infaddict> so i think is a RX problem
[08:20] <mfa298> a handheld radio and android phone with mobile tracker is much more portable than a laptop and dongle. But they all have their uses
[08:20] <Vaizki> I think your dongle is broken or the antenna connection is iffy
[08:21] <Vaizki> just doesn't make any sense that your waterfall is empty on 433.900 in an urban environment
[08:21] <infaddict> possibly Vaizki. i will prove that at weekend by 1) doing same test on Upus backup tracker (proving if my TX is issue)... 2) using spare dongle
[08:21] <infaddict> and likely 3) buying something expensive
[08:22] <mfa298> antenna location can make a big difference. Local obstructions really can kill a signal
[08:22] <Vaizki> if you had SMA connectors there I'd suspect you have a SMA female connected with RP-SMA female :) they thread nicely but there is no center pin connection
[08:22] <infaddict> mmm this was line of sight on a massive field mfa298 so even more worrying
[08:22] <gonzo_> I use 433.900 as a sanity check when I power up my kit. It's busy as hell in town
[08:23] <fsphil> here too now
[08:23] <fsphil> it wasn't when I started HAB tracking
[08:23] <daveake> infaddict to give you an idea, on flat ground I could pick up and just about decode a payload half a mile away, flat ground with a few trees in the way, with the payload aerial flattened between payload and ground
[08:23] <gonzo_> even using a handheld scanner on AM with the whip anyenna, 433.9 is still pretty active
[08:23] <daveake> that was with a scanner
[08:24] <infaddict> ok thx. i had my payload hanging from a tripod, so antenna was about 1 metre off ground. on a slight rise in a field many miles long.
[08:24] <daveake> And your goal is to be able to decode from the nearest road, which could definitely be rather more than 300m away
[08:24] <infaddict> yep exactly
[08:25] <infaddict> if i could borrow another receiver i could prove it 100%, but will do other tests first
[08:25] <Vaizki> if you have line of sight, it will not be ideal close to ground but you should still get a few kilometers?
[08:25] <infaddict> yer i'd expect at least 1 mile hopefully more with LOS
[08:25] <infaddict> when at ground level
[08:25] <gonzo_> any hams around you, or a club?
[08:25] <Vaizki> well actually on 70cm band if you have it 1m off the ground it should be just fine
[08:26] <Vaizki> as good as high up in the sky
[08:26] <infaddict> good q gonzo_ - i found the local ham club on the net yesterday so might pay them a visit and ask for a volunteer ;-)
[08:26] <fsphil> good luck
[08:26] <infaddict> as last resort i could buy online, test and return if needs be
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[08:28] <Vaizki> can you try your dongle in a windows pc just to rule out any issues with the mac + gqrx buils?
[08:28] <Vaizki> build
[08:28] <infaddict> now my distant launch date seems rather not too distant, with problems to address ;-)
[08:28] <infaddict> yep Vaizki i have a fairly old windows laptop (win 7) but still up to the job of tracking so can also try that
[08:29] <daveake> infaddict local ham clubs are useful ... many of the members will have lots of 70cm kit most of which never sees the light of day
[08:29] <fsphil> are you able to hear FM stations on the rtlsdr?
[08:29] <infaddict> yes fsphil
[08:29] <infaddict> BBC R1 very strong
[08:29] <infaddict> others audible but not as strong
[08:29] <fsphil> similar to here
[08:29] <fsphil> your issue might be something else
[08:30] <infaddict> the HabAmp is definitely helping. the signal is clearly stronger using that and I have to turn the gain down a bit.
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[08:30] <infaddict> in terms of TX checking, i have continuity between the SMA connetion (both parts) on PCB all the way to tips of ground plane and main antenna element.
[08:31] <Vaizki> if you have the payload + receiver inside the house, how much does the signal level jump up when you connect the receiving antenna?
[08:31] <infaddict> i also have continuity from correct PCB holes to the SMA output etc. so i think all that is good.
[08:31] <Vaizki> and when I say inside the house, I don't mean on the same desk but maybe 5 meters apart at least..
[08:31] <infaddict> i get no signal without an antenna Vaizki. i thought that was normal for cheap dongles.
[08:31] <Vaizki> what
[08:31] <Vaizki> hmm
[08:32] <infaddict> not even FM radio
[08:32] <infaddict> if i insert any wire (e.g. guitar wire), bang I get radio
[08:32] <fsphil> sounds fine
[08:32] <daveake> yup
[08:32] <Vaizki> well now that you mention it, I might not have tried it myself without an antenna
[08:32] <Vaizki> because my antenna has always been outside
[08:33] <Vaizki> so having the NTX2B inside with a tin roof in between is a good attenuator :)
[08:33] <daveake> my lora gateway rx's just fine without an aerial, , 1 metre from payload (with aerial), but then that does have a habamp on it
[08:34] Nick change: fl_0|afk -> fl_0
[08:34] <infaddict> my plan was to always upgrade to a AirSpy or FCBP+ later on, if i prove its the dongle i might jump earlier
[08:34] <Vaizki> grasping at straws.. what is the SnR like in dB when you are able to decode the transmission for example in the house?
[08:35] <Vaizki> difference between signal peak and noise floor
[08:35] <infaddict> at work at the moment, but will take some screen grabs for u later to show that
[08:35] <infaddict> including how it fades to nothing as i move away
[08:35] <infaddict> it could be a noise issue, i agree
[08:37] <Vaizki> have you tried with the dvb-t whip that came with the dongle? :)
[08:38] <Vaizki> I know it's not meant for 433 MHz but just for comparison
[08:39] <infaddict> yes all my initial testing was with the small magnetic antenna that came with it. works fine in the house, havent tried long distance with it tho.
[08:39] <fsphil> worth getting an airspy/fcd. you can always sell them again
[08:40] <fsphil> not sure how well they work on the mac though
[08:40] <Vaizki> airspy works fine on the mac with gqrx
[08:40] <fsphil> do you get it on the device list?
[08:40] <fsphil> I've noticed it doesn't get listed on mine, but if I type in "airspy" it works fine
[08:40] <day_> i ordered a second dvb-t stick. apparently thefirst one was indeed not broken. I think my walls are pure metal :"D
[08:41] <Vaizki> and while I applaud the effort in getting a straightforward gui for GR through gqrx, it's still frustrating compared to SDR Console 2.3 or SDRSharp
[08:41] <infaddict> fsphil, i'm starting to think a cheap netbook is the way forward. rather than taking my £1500 MBP out in the field. seems most hware/sware prefers Windows anyway.
[08:41] <Vaizki> fsphil, I do get it on the list yes
[08:41] <infaddict> and my £200 project of 5 months ago is now reaching £1000 hehe
[08:41] <fsphil> second hand thinkpad
[08:41] <fsphil> perfect
[08:41] <infaddict> welcome to HAB ;-)
[08:41] <day_> i think even the windows have metal coating. my gps receiver is unable to get a lock through them :D
[08:42] <infaddict> yep gonna scour ebay for some second hand laptop/netbooks i think
[08:42] <dbrooke> I just tried a test here, RTLSDR with nothing connected to MCX, can just see traces on waterfall in gqrx (linux) of breadboarded payload with 1/4 wave wire a few rooms away
[08:42] <infaddict> thx dbrooke - is that a NTX2B?
[08:43] <eroomde> second the 2nd hand thinkpad
[08:43] <eroomde> x201 is the second best machine i own
[08:43] <eroomde> best being the MBP obv
[08:43] <dbrooke> it's actuall LoRa since that was set up
[08:43] <infaddict> k thx
[08:44] <dbrooke> an NTX2 with just power and no antenna needs at least the supplied DVB-T antenna at the same distance
[08:45] <Vaizki> infaddict, I suggest a/b comparison between the dvb-t whip and the magmount 70cm/2m..
[08:45] <Vaizki> to rule out dodgy antenna, cable, adapters, what not
[08:45] <infaddict> dbrooke: yes that was my findings. my PCB alone (no antenna) would not be picked up (even 1 metre away) unless I added the DVB-T antenna
[08:45] <Vaizki> the magmount should clearly beat the dvb-t whip
[08:46] <infaddict> yep Vaizki - added that to my list of weekend testing to do. i agree mag mount should see better performance.
[08:48] <dbrooke> also in some previous testing I found that RTLSDR + HabAmp was about as sensitive as my IC-R7000 receiver (though more susceptible to interference from local 433.9 stuff)
[08:49] <infaddict> yep my initial long range test didnt involve HabAmp (as I stupidly left a cable in house). This weekend I will test that.
[08:49] <infaddict> hopefully by Sunday I will know the cause of issue and have some ideas on what to do next. Thanks to everybody for the great advice as usual.
[08:50] <dbrooke> HabAmp definitely helps, though I'd still have expected better than your findings without it
[08:51] <infaddict> i am really hoping its a RX issue which is easier to fix. If its TX and a problem with my PCB design I am goosed.
[08:51] <daveake> You had people here check out your layout? If so then it's not going to be that.
[08:52] <infaddict> yep many people
[08:52] <infaddict> Upu et al
[08:52] <infaddict> and multimeter says continuity all the way to antenna tips is good. and i am getting good decoded signal. just not at distance.
[08:53] <eroomde> i don't know an al's on this channel
[08:53] <eroomde> got a link to your layout?
[08:54] <infaddict> let me dig out it out - 2 secs
[08:54] <Vaizki> we straightened out his antenna traces.. literally.. :)
[08:54] <infaddict> http://gerblook.org/pcb/Gy2tzAR8RxYH3bN68BKHQR
[08:55] <daveake> infaddict Turns out that I already wrote an article on chasing :p https://ukhas.org.uk/guides:chasing_your_flight
[08:55] <eroomde> hmm it's hard for that to go wrong
[08:55] <eroomde> definitely no solder bridges from rf_out to a surrounding bit of gnd?
[08:55] <Vaizki> infaddict, so did you check that there is no continuity between antenna signal and gnd?
[08:56] <Vaizki> sync(eroomde)
[08:56] <eroomde> it's all clean and free of old bits of flux?
[08:56] <infaddict> Vaizki and eroomde, yep no continuity between GND and RF out (sure i checked that last night, but will do so again)
[08:56] <infaddict> thx daveake - will re-read that one
[08:58] <dbrooke> BTW eroomde the talk last night was fairly low on tech as predicted but still quite interesting to me from the wider overview of Skylon. Frost control is still a secret 8-)
[08:58] <Vaizki> when you say no continuity.. are you using the beep on the DMM or actually checking the resistance in ohms?
[08:58] <eroomde> dbrooke: i don't think it is a secret
[08:59] <Vaizki> wasn't that in the patent doc
[08:59] <eroomde> yes
[08:59] <dbrooke> well, he stated IP reasons for not disclosing
[08:59] <infaddict> Vaizki: both the beep and looking and readout. gonna check it all again at weekend.
[08:59] <eroomde> i won't talk about it just incase i'm not meant to but basically i'm pretty sure the patent is illuminating
[09:00] <dbrooke> oh, fair enough
[09:00] <dbrooke> I'll look it up
[09:00] <eroomde> rob is quite straight-laced about such things though :)
[09:03] <eroomde> infaddict: do you have a scope?
[09:03] <infaddict> eroomde: nope
[09:04] <Vaizki> now it's a £1200 hobby!
[09:04] <eroomde> you might wish to bodge some decoupling capacitors onto the various power lines
[09:05] <eroomde> (rigol 1054z - best money you'll spend ever in electronics if you get bitten by the bug)
[09:05] <Vaizki> yes, go go 1054z
[09:05] <Vaizki> amazing what you can get for 300 euros + vat
[09:06] <infaddict> come on guys. my wife is already wondering how i've acquired this amazing amount of components, kit and wires for under £200 ;-)
[09:06] <Vaizki> :D
[09:06] <dbrooke> one of those is on my list ...
[09:06] <daveake> wives need training
[09:06] <dbrooke> scope, not wife 8-)
[09:06] <daveake> :)
[09:07] <infaddict> ha!
[09:07] <eroomde> i would not be without my scope
[09:07] <Vaizki> my wife wonders why I need to have 3 oscilliscopes
[09:07] <eroomde> i feel you
[09:07] <eroomde> tho i have no wife
[09:07] <eroomde> and only 2
[09:07] <daveake> mine doesn't know I have 3
[09:07] <eroomde> i have an old analogue one which i use for times when i don't want to endanger my really nice one
[09:07] <Vaizki> actually I don't need 3.. one of them is crap.
[09:08] <eroomde> making homemade spark-plug ignition circuits and so on
[09:08] <dbrooke> I have an old rack mounted tek dual beam 10MHz ish
[09:08] <eroomde> i have 2 teks
[09:08] <eroomde> a 465
[09:08] <eroomde> and a rather newer one :)
[09:08] <Vaizki> tbh I would like to have 1054Z and then a high bandwidth old scope if I need to go beyond 100MHz
[09:09] <eroomde> my dso is 1GHz 4ch
[09:09] Action: eroomde looks smug
[09:09] <Vaizki> almost got a 500MHz TEK for under 300 but was 5mins too slow
[09:11] <eroomde> oh, russia
[09:11] <eroomde> http://siberiantimes.com/other/others/news/n0247-got-him-director-accused-of-fraud-at-new-spaceport-is-detained-in-belarus/
[09:13] <Vaizki> 75k usd? I thought they just had like 1.5B drop through the cracks in the russian space program
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[09:14] <infaddict> I mean, look at this car. Just look at it.
[09:14] <infaddict> Did he spend 75k on bling paint work?!
[09:15] <Vaizki> no, 300k
[09:15] <Vaizki> it says that in the article :)
[09:19] <day_> Vaizki: a digital one? :o
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[09:25] <Vaizki> day_, yes TDS 520A
[09:25] <dbrooke> think how much test gear 300k would have bought
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[09:34] <Laurenceb__> i like my trust $4 saleae clone
[09:35] <Laurenceb__> best tool ive bought
[09:35] <Vaizki> I like my original saleae..
[09:36] <Laurenceb__> innards are identical :P
[09:41] <zyp> makes sense you guys both like it then
[09:41] <daveake> I wonder if Salae will ever "do an FTDI"
[09:42] <Laurenceb__> not sure if they can
[09:42] <Laurenceb__> also there are open GUI tools now
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[09:43] Nick change: fl_0 -> fl_0|afk
[09:43] <Laurenceb__> http://essentialscrap.com/tips/arm_trace/theory.html
[09:45] <Laurenceb__> video is totally epic
[09:47] <Aernout> Hi, flight GKC Thermal Bottle test (payload (GKCV3B) is cancelled.
[09:47] <Laurenceb__> Thermal Bottle test
[09:47] <Laurenceb__> sounds interestingf
[09:49] <Aernout> I'm a physics teacher and some of my pupils (age of 14) designed different PET-bottles with different colors and isolation to determene which bottle configuration is the best for a payload casing
[09:49] <Aernout> using solar power
[09:50] <Laurenceb__> ah very good idea
[09:50] <Aernout> As a little contribution to the HAB-community
[09:51] <Laurenceb__> daveake: Saleae cant stop you using http://www.sigrok.org/blog/new-protocol-decoders-arm-tpiu-itm-etmv3
[09:52] <daveake> nice
[09:52] <eroomde> i have a salae but my new scope as a logic analyser now
[09:52] <eroomde> and it's a bit nicer
[09:52] <eroomde> (and live)
[09:52] <eroomde> shorter memory tho
[09:52] <Laurenceb__> the raw export is really useful
[09:52] <Aernout> Can I cancel the flight in habitat?
[09:52] <Laurenceb__> I've used it to trace race conditions in hardware
[09:52] <Laurenceb__> left running overnight then look at data in python
[09:53] <Vostok> race trace conditions
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[10:02] <infaddict> Aernout: I dont think you can delete from Habitat, things stay forever
[10:03] <adamgreig> Aernout: yea don't worry about it
[10:05] <eroomde> Aernout: shame about the cancellation - weather conditions?
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[10:34] <pc1pcl> eroomde: weather is fine, just wind => predicted landingspot is no good (according to the cancelation mail on the Dutch mailing list)
[10:36] <Laurenceb__> http://science.slashdot.org/comments.pl?sid=7507825&cid=49846553
[10:37] <pc1pcl> (landing predicted to be in urban area near power plant => flight to be replanned in a few weeks.)
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[10:53] <Laurenceb__> I just wrote an essay on american patriotism
[10:53] <Laurenceb__> you essay, you essay
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[11:05] <infaddict> anybody know of any Unix products that allow changing of system date/time per application? I.e. for past/future date testing of apps (but not whole box)?
[11:05] <infaddict> in my old mainframe days there was a good product called "HourGlass" which did exactly that
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[11:07] <LunarWork> hello
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[11:46] <day_> Vaizki: damn :O
[11:47] <day_> Vaizki: for how much do they usually sell?
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[11:48] <Vaizki> day_, I dunno really but I expect at least double that
[11:49] <day_> even duoble sounds cheap :/
[11:49] <Vaizki> depends on options etc
[11:49] <day_> a new one is like 2k+
[11:49] <day_> or was it 4k?
[11:49] <Vaizki> if you don't need more than 100MHz just get a rigol 1054z and hack it :)
[11:50] <day_> the 20xx is neat 300Mhz for 800 bucks
[11:50] <Vaizki> anyway, I have to run.. or actually drive.. 220km + boat to summer cabin
[11:50] <day_> sailboat?
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[12:38] Action: infaddict has bought an AirSpy
[12:40] <daveake> woo
[12:41] <infaddict> all the gear and no idea
[12:42] <infaddict> wonder whether HabAmp is still a good idea or just AirSpy alone
[12:42] <daveake> yes still helps
[12:43] <infaddict> ok, i will let you guys know about service/shipping from SecQuest - in case any others in UK gonna order
[12:44] <Upu> Habamp works well with the Airspy
[12:45] <infaddict> impressed with SecQuest so far. Mail within 5 mins of order saying will be dispatched today with signed for delivery tomorrow.
[12:46] Nick change: fl_0|afk -> fl_0
[12:46] <Upu> is that the UK disty ?
[12:46] <infaddict> Upu: yep
[12:46] <Upu> how much was it ?
[12:46] <infaddict> £160
[12:46] <Upu> ok
[12:46] <infaddict> so slightly more than a US import
[12:46] <fsphil> mine was about that after import duty was added
[12:47] <Upu> yep
[12:47] <fsphil> I should've bought it when I was in the US </duh>
[12:49] <infaddict> so tomorrow i can play with it and hopefully actually receive something on the 70cm band outside of my payload
[12:49] <infaddict> still keeping eye on a handheld for a bargain if i can find one
[12:50] <infaddict> also, I lied when I said I had zero radio experience. Tidying loft and found my VHF certificate/licence from 1992 hehe!
[12:50] <infaddict> forgot all about that, wasnt exactly hard.
[12:51] <adamgreig> still isn't
[12:51] <infaddict> It was from my yachting days. basicaly learned about channels and how to send mayday/panpan.
[12:51] <fsphil> you'll be able to receive pretty much the entire 70cm band in one go, minus the edges
[12:51] <fsphil> if it's anything like here, it'll basically be empty
[12:51] <gonzo_> the airspy is 10meg isn't it?
[12:52] <fsphil> yea, though it drops at the edges a bit
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[12:52] <gonzo_> rr
[12:52] <infaddict> fsphil: hoping in a fairly large town i will see something on it
[12:52] <adamgreig> the bladerf 40MS/s <3
[12:53] <fsphil> you'll see plenty of ISM stuff
[12:53] <adamgreig> much bandwidth, very channels
[12:54] <fsphil> http://i.imgur.com/g6hfsMA.jpg
[12:54] <infaddict> Vaizki: did you install any software for using AirSpy on OSX? Website mentions plug and play for Windows but nothing on Mac.
[12:54] <fsphil> that's a snapshot I took recently
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[12:54] <gonzo_> with a habamp, you should see some ar satellites too
[12:54] <infaddict> so 433.900 then
[12:54] <fsphil> yea lots around 433.9
[12:54] <infaddict> thats the carrier at 435?
[12:55] <gonzo_> as I said yesterday, 433.9 is used as a test on my system
[12:55] <fsphil> not sure, it's not data
[12:55] <infaddict> mmm
[12:55] <fsphil> possibly some noise coming of something in my house
[12:57] <fsphil> it's got enough bw to receive dvb-t signals. could turn it into an expensive rtlsdr :)
[12:58] <infaddict> fsphil, i see you are using Gqrx on either linux or osx. did you need any software for AirSpy?
[12:58] <fsphil> I'm on fedora linux, needed to build the airspy tools and rebuild gr-osmosdr
[12:59] <fsphil> still having awful trouble with pulseaudio. the audio output gets garbelled a lot
[13:01] <infaddict> ok thx
[13:01] <infaddict> i'm just using SoundFlower to direct audio from Gqrx to fldigi
[13:01] <infaddict> on OSX
[13:10] <fsphil> it's annoying how many audio problems I've had in linux
[13:13] <LunarWork> be back later
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[13:52] <eroomde> http://www.analog.com/en/products/digital-to-analog-converters/da-converters/ad9152.html
[13:52] <eroomde> so that's quite fun
[13:53] <SpeedEvil> neat
[13:54] <SpeedEvil> It's not evern very expensive
[13:55] <mattbrejza> 'low power'
[13:55] <SpeedEvil> And yes.
[13:55] <SpeedEvil> It's low power from the perspective of a wallplug
[13:56] <SpeedEvil> not so much for batteries
[13:56] <mattbrejza> true
[13:56] <SpeedEvil> But if you're wanting to push a gigabyte/s of data, then its power use is unlikely to be important
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[14:28] <Lunar_Lander> hello again
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[15:15] <SpacenearUS> New vehicle on the map: 03KC1DPF - 12http://tracker.habhub.org/#!qm=All&q=KC1DPF
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[15:30] <Lunar_Lander> so
[15:31] <_charlie> bonjour
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[16:12] Nick change: fl_0 -> fl_0|afk
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[16:28] <Vaizki> infaddict, no drivers needed for airspy. Congrats on gettting one
[16:28] <infaddict> thx Vaizki
[16:29] <Vaizki> also airspy can feed the power to habamp via the bias tee
[16:29] <infaddict> yer was just reading that. at the moment my habamp is in a enclosure with SDR dongle (getting powered from that). will have to think of a new way.
[16:29] <Vaizki> Upu confirmed it works even if not really in spec
[16:29] <infaddict> ah its on their website, was just reading it
[16:30] <infaddict> its mentioned on quick start guide: http://airspy.com/index.php/quickstart/
[16:30] <infaddict> 4.5v @ 50mA
[16:30] <Vaizki> There is also #airspy when you run into a wall :)
[16:31] <infaddict> ah ok cool
[16:31] <infaddict> guessing i could remove cheap dongle from enclosure and flick HamAmp switch to Bias-T
[16:32] <infaddict> anything special needed to use Bias power, or standard coax work fine?
[16:32] <SpacenearUS> New vehicle on the map: 03VORTEX5 - 12http://tracker.habhub.org/#!qm=All&q=VORTEX5
[16:34] <Vaizki> Normal coax yes
[16:34] <infaddict> ok i hiave some short SMA to SMA cables but quite thin, not the standard thicker stuff
[16:39] Nick change: pidpawel -> pid
[16:41] Nick change: heathkid|2 -> heathkid
[16:41] <SpacenearUS> New vehicle on the map: 03N0NQN-11 - 12http://tracker.habhub.org/#!qm=All&q=N0NQN-11
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[18:05] Action: SpeedEvil ponders compressed gas safety.
[18:05] <SpeedEvil> I'm pretty sure that parcelforce is not OK with you sending full 10l cylinders - even of argon - through the post
[18:05] <SpeedEvil> But yay ebay.
[18:14] <_charlie> As far as the general populous is concerned, any gas cylinder contains a highly inflammable gas and is liable to explode at the slight touch.
[18:15] <SpeedEvil> I mean - in practice - they're so robust, and this was so well packed, I'd be fairly confident it' be OK dropped from 20, not 2m
[18:16] <_charlie> hey
[18:16] <_charlie> if i can hide a cylinder in my room at halls, you can send one through the post :P
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[18:26] <SpacenearUS> New vehicle on the map: 03CALLSIGN123_chase - 12http://tracker.habhub.org/#!qm=All&q=CALLSIGN123_chase
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[18:59] <SpacenearUS> New vehicle on the map: 03YAM-1 - 12http://tracker.habhub.org/#!qm=All&q=YAM-1
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[19:36] <Reb-SM3ULC> Vortex has -281.4C external temp. Kiruna is darn cold even in summer.
[19:39] <gb73d> not that cold
[19:39] <_charlie> Vortex deserves Nobel prize
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[19:46] <gb73d> :)
[19:47] <gb73d> -28 more like
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[19:50] <_charlie> ah phew ;)
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[21:19] <sp5nvx_> Doc ID: 8723a99877470e60dd1e3e4060ca9bbf (sq5nwi)
[21:19] <sp5nvx_> approve pls
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[21:43] <_charlie> hi
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[21:48] <Laurenceb> xfce O_o
[21:48] <Laurenceb> its become sentient
[21:53] <_charlie> :O
[21:55] <_charlie> you familiar with eagle laurence?
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[21:59] <andew> Laurenceb sorry I didn't know that is already in use :)
[21:59] <Laurenceb> _charlie: yes
[22:00] <_charlie> Say I have a copper pool
[22:00] <_charlie> but there's an area within that which I do not want to be filled
[22:00] <Laurenceb> I think you can use keepout layers for that
[22:01] <Laurenceb> but i tend to just do a cut into the polygon
[22:01] <_charlie> Ah ok, will try that, thanks
[22:02] <_charlie> yep, worked thanks
[22:04] <_charlie> My plans to observe jupiter over the summer holidays have been ruined :(
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[22:20] <andew> does anyone know what kind of hardware is used in these balloons?
[22:20] <andew> http://picospace.net/?p=923
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[22:22] <_charlie> not in those ones specifically, but I'm just about finished editing a very similar payload on Eagle right now! :D
[22:22] <_charlie> I would be happy to share with you, let me get the original designer's permission first.
[22:24] <andew> It must be very light and sophisticated.. it's a pity that there is no images or tehnical details
[22:25] <andew> I would be glad if you'll share it :)
[22:25] <_charlie> yeah, a similar project had a payload that weighed 11g including battery
[22:26] <andew> wow
[22:26] <andew> Which GPS module did you use?
[22:27] <andew> https://ukamsat.files.wordpress.com/2013/10/sp3osj-pico-balloon-payload.jpg
[22:27] <_charlie> one of these http://www.u-blox.com/en/gps-modules/pvt-modules/max-m8-series-concurrent-gnss-modules.html
[22:27] <andew> This looks very interesting, but I don't know how solar cells are connected.
[22:28] <andew> looks like 2x 0,5V solar cell
[22:28] <andew> great I used GSM LEON-g100 from u-blox in my projects
[22:29] <andew> I'm very satisfied
[22:29] <_charlie> my guess is he's using the ground plane of his Tx on the PV cells ' ground
[22:29] <_charlie> nice one :)
[22:29] <andew> maybe, but he needs aditional wire for positive
[22:29] <_charlie> yeah
[22:30] <andew> probably there is dc-dc on the circuit board to step up the voltage
[22:31] <andew> _charlie What kind of radio transmitter do you use in your design?
[22:32] <_charlie> The design I edited uses a Si4060
[22:33] <andew> PS-46 was released at 7am 23/5/2015 AEST.. wow 14 days in the air..
[22:33] <_charlie> This is guy is awesome too http://www.leobodnar.com/balloons/
[22:34] <_charlie> hi B64 balloon spent more than 2 months up
[22:38] <andew> amazing
[22:38] <andew> mmm payload ~ 13g http://www.leobodnar.com/balloons/B-2/index.html
[22:41] <andew> I prefer lithuium 3,6V battery.. It is a little lighter and you don't need a DC-DC converter. http://www.leobodnar.com/balloons/B-2/Pages/4.html
[22:42] <andew> lol I'm stupid.. It's AAA battery.. it's amazing design
[22:42] <mfa298> and if you come to the ukhas conference you might get to hear from Leo about how to make balloons that stay up. https://ukhas.org.uk/general:ukhasconference2015
[22:43] <SpeedEvil> https://www.youtube.com/watch?v=4_sLTe6-7SE oh my god
[22:43] <SpeedEvil> that is _beautiful_
[22:43] <andew> interesting.. but I'm pretty bad in english :D
[22:43] <SpeedEvil> - SpaceX vid from recently recovered gopro on fairing
[22:44] <_charlie> i would be more interested seeing the burning up >:D
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[22:46] <SpeedEvil> yeah
[22:46] <SpeedEvil> I wonder if it stopped at that point - lack of power - or if they're not showing the rest
[22:47] <_charlie> yeah
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[23:08] <Laurenceb> i wonder if they encrypted the card
[23:08] <Laurenceb> maybe ITAR?
[23:09] <Laurenceb> I'm betting they have custom GoPro firmware
[23:09] <Laurenceb> I'd like to have it :P
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[23:17] <Laurenceb> is next spacex launch going to try on land recovery?
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[23:51] <SpeedEvil> Laurenceb__: not been announced yet AIUI
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[00:00] --- Sat Jun 6 2015