highaltitude.log.20090413

[00:01] <Laurenceb> back
[00:07] <Laurenceb> AD4350 looks perfect for my needs
[00:08] <Laurenceb> it wasnt around when I looked for parts before - looks perfect
[00:11] <Laurenceb> hmm its only avaliable from tomorrow
[00:12] <Laurenceb> just in time :P
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[00:17] <Laurenceb> gtg, cya
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[00:50] <edmoore> stilldave: you are american
[00:50] <edmoore> yep?
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[07:50] <natrium42> hey rjharrison
[07:51] <rjharrison> hi natrium42
[07:52] <rjharrison> Did the path get through to spacenear.uk ok
[07:52] <rjharrison> hehe us
[07:52] <natrium42> yep, worked great
[07:52] <rjharrison> Cool will have to have a better launch next time
[07:52] <natrium42> too bad about the payload
[07:53] <natrium42> hope you find it to see what the problem was
[07:53] <rjharrison> Yep I can't think what went wrong
[07:53] <natrium42> do you have backup components?
[07:53] <rjharrison> Mor or less yep
[07:53] <natrium42> for second payload?
[07:53] <rjharrison> I have all the components
[07:53] <rjharrison> Just need to solder the stripboard
[07:53] <natrium42> cool
[07:53] <rjharrison> Though I may make a pcb
[07:54] <natrium42> ah, good idea
[07:54] <natrium42> what kind of power connectors are you using, btw?
[07:54] <rjharrison> It will save a lot of time in the long run
[07:55] <rjharrison> wel the on/off is a jumper
[07:55] <rjharrison> ie push the jumper on to connect
[07:56] <rjharrison> I thought this would be more reliable
[07:56] <natrium42> so if the jumper falls off, your computer is not powered?
[07:56] <rjharrison> Yep
[07:56] <natrium42> ouch
[07:56] <natrium42> yeah, it's better to avoid single points of failure :)
[07:56] <rjharrison> But it is a tight fit
[07:57] <rjharrison> Do you have a dual powere source?
[07:57] <natrium42> what about the power connector itself?
[07:57] <rjharrison> IT a push fit pp3 connector to a power pack of 4 aa's
[07:57] <rjharrison> it's
[07:57] <natrium42> HALO3 used dual power source: one for GM862-GPS and one for SPOT/flight computer
[07:58] <natrium42> pp3?
[07:58] <natrium42> ah, the one 9V blocks use?
[07:58] <rjharrison> yep
[07:59] <natrium42> the connection between wire and the metal contacts looks dodgy on the ones i have
[07:59] <rjharrison> http://www.flickr.com/photos/30721501@N05/3168660274/in/set-72157612167714216/
[08:00] <rjharrison> This is the tracker
[08:00] <natrium42> hrm
[08:00] <natrium42> it does look quite solid
[08:00] <natrium42> it's really surprising that it failed
[08:01] <rjharrison> Payload was paced well with insulation blocks to hold every thing in place tightly
[08:01] <rjharrison> ie you caould shake it like mad and noting would move
[08:02] <rjharrison> http://www.flickr.com/photos/30721501@N05/3429333865/in/set-72157616505094071/
[08:02] <rjharrison> This is it nearly packed up save the camera
[08:03] <rjharrison> Notice the block of styrene holding the rx in place and the batteries
[08:04] <natrium42> yeah
[08:04] <natrium42> looks solid
[08:04] <natrium42> what does that TO220 device do?
[08:06] <natrium42> also, the batteries were zip-tied to the holder, right?
[08:06] <natrium42> can't see it from this angle
[08:08] <rjharrison> The only problem is that the antennas were very long this launch. Well the slim jim antenna was about 1.7m long
[08:08] <rjharrison> t0220 ?
[08:08] <rjharrison> I can't see that
[08:08] <natrium42> the power cables seem to be zip-tied to it
[08:09] <rjharrison> Oh that is the regulator
[08:09] <rjharrison> 3.3v
[08:10] <natrium42> so if the package disintegrates for and battery yanks on it, it can potentially twist the contacts of the regulator
[08:11] <natrium42> -for
[08:11] <rjharrison> Yep it's possible
[08:11] <rjharrison> But we are talking catastrophic failure
[08:11] <natrium42> yah, the package looks well made
[08:12] <natrium42> what glue did you use for the styro panels?
[08:12] <rjharrison> Given the packing I eould have thought it could tumble free fall to the ground with out a para and survive
[08:12] <rjharrison> Well at least till impact
[08:12] <natrium42> yeah :/
[08:13] <rjharrison> Low melt glue stick and then very well taped
[08:14] <natrium42> is it possible that the antenna cable got yanked for some reason?
[08:14] <rjharrison> Yep that is my best theory.
[08:14] <natrium42> it looks like it also loops around the regulator and could short circuit the legs
[08:15] <rjharrison> On my first launch the antenna for tx 434 was pulled so hard by twisting with the baloon that it ripped the sma connector from the board and dislodged the tx
[08:16] <rjharrison> Ignore that connector byt the reg that is the GPS antenna which is stuck fast to the box he says
[08:18] <rjharrison> http://www.flickr.com/photos/30721501@N05/2961202695/sizes/o/in/set-72157608235936214/
[08:18] <rjharrison> If you look just below the tx you can see the sma has been pulled from the board
[08:18] <natrium42> ouch
[08:19] <rjharrison> and that the tx has been lifted and angled from the board
[08:19] <rjharrison> That was just the balloon wrapping around the antenna it's the twisting round and round that can build such stong forces
[08:20] <natrium42> yeah, better make sure it's fixed for next launch :)
[08:20] <natrium42> so that the cable can't move inside the payload
[08:21] <rjharrison> need to make a cup of tea for wife. Morning time here :)
[08:21] <natrium42> kk, i am off to bed
[08:21] <natrium42> g'nite
[08:21] <rjharrison> Will do I'm going back to the design board
[08:21] <rjharrison> nights
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[09:17] <rjharrison> .
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[11:26] <rhjharrison> Mornnig ed
[11:27] <rhjharrison> Icarus should be quite weatherproof if we consider it still in one piece
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[11:35] <Laurenceb> hi
[11:36] <gordonjcp> hi
[11:36] Action: gordonjcp wonders if the term "half-witted Bengali clagnut" is too strong a term to use in a letter of complaint to Virgrim Media
[11:37] <rhjharrison> hi guys
[11:38] <rhjharrison> No news on icarus
[11:38] <edmoore> hi
[11:38] <rhjharrison> waiting for the phone to ring hopefully
[11:38] <rhjharrison> I think i will put the web address on the next one
[11:39] <rhjharrison> Payload will keep tx ing for about 18 hours
[11:39] <rhjharrison> So should be dead by now
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[11:45] <jcoxon> hey all
[11:47] <rhjharrison> hi
[11:47] <rhjharrison> How's it going
[11:47] <rhjharrison> Waiting for the phone to ring.
[11:49] <jcoxon> rjharrison, it might be a while
[11:49] <jcoxon> but its on land so it'll eventually be found
[11:49] <jcoxon> work started on icarus III?
[11:50] <Laurenceb> who makes RF ICs? apart from AD, Ti, Linear tech, Maxim and National? Have I missed any?
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[12:40] <gordonjcp> Laurenceb: CML
[12:40] <Laurenceb> CML, whats that stand for?
[12:40] <gordonjcp> Consumer Microelectronics Ltd
[12:40] <gordonjcp> or some such
[12:41] <gordonjcp> you want to look at their CMX589
[12:41] <Laurenceb> I'm looking for a wideband vector demodulator IC
[12:41] <shellevil> Laurenceb: ... I meant to say something...
[12:41] <shellevil> Ah
[12:41] <gordonjcp> they do one that's a complete GMSK modem for 400-odd MHz on a chip
[12:42] <gordonjcp> *kick ass*
[12:42] <shellevil> Some simple sums seemed to indicate that for the sampled IF idea earlier, the jitter seems to need to be under 4ns
[12:42] <Laurenceb> the ADL5387 is good, but it eats power
[12:42] <Laurenceb> - 180mA at 5v
[12:42] <shellevil> Laurenceb: remind m again what this is for? It's that SDR thingy?
[12:43] <Laurenceb> yes
[12:43] <Laurenceb> or a slimmed down version for balloon use
[12:43] <Laurenceb> takling RF and USB comms at the same time is a bit of a headache
[12:44] <shellevil> seen the bifferboard thing?
[12:44] <shellevil> looks interesting for balloons maybe
[12:45] <Laurenceb> yeah
[12:45] <Laurenceb> I was thinking, most HAMs dont need tons of bandwidth - they could get away with a slimmed down vesion with just a few KHz bandwidth
[12:46] <Laurenceb> so a direct conversion receive with AVR would the trick
[12:47] <Laurenceb> you could even *horror* stick the arduino bootloader on it and make some new arduino library stuff to support the hardware and allow PLLs, FLLs ect in software at low baud rate
[12:47] <Laurenceb> "ardradio"
[12:49] <Laurenceb> whats the baudrate on aprs?
[12:54] <Laurenceb> ooh thanks for the link gordonjcp
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[13:44] <edmoore> rcaron: how's tricks?
[14:02] <edmoore> rjharrison: ping
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[14:43] <sbasuita> Damn! Can't get any sms sent with at commands :(
[14:46] <shellevil> wiki.openmoko.org
[14:46] <shellevil> there is a send9ng SMS manually page
[14:55] <gordonjcp> sbasuita: run out of credit?
[14:58] <shellevil> yeah
[14:58] <shellevil> try in a normal phone
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[15:04] <sbasuita> gordonjcp, no, i'm on contract (it's practically bottomless) ; )
[15:04] <sbasuita> Trying to construct something using http://www.dreamfabric.com/sms/ , but the phone just doesn't like it :(
[15:06] <gordonjcp> oh well
[15:06] <gordonjcp> always worth checking the obvious
[15:07] <shellevil> why not ascii mode?
[15:08] <shellevil> http://wiki.openmoko.org/wiki/Manually_using_SMS
[15:10] <sbasuita> shellevil, PDU only on my phone
[15:10] <shellevil> ah
[15:10] <shellevil> you should get a freerunner.
[15:10] <sbasuita> It's pretty harsh
[15:11] epictetu1 (n=pattm@static-71-174-73-53.bstnma.fios.verizon.net) got lost in the net-split.
[15:11] Action: shellevil giggles helplessly.
[15:11] <sbasuita> The phone only tells you "OK" or "ERROR"
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[16:02] <sbasuita> Score!
[16:02] Action: sbasuita receives a return message from his partner in France: "Profit!"
[16:02] <sbasuita> : )
[16:20] <gordonjcp> sbasuita: nice
[16:21] <sbasuita> gordonjcp, well, the first text message I sent off contained "hellohello" - an already converted string lifted off the internet - which was fine. The second text contained my own string, which apparently I failed to encode properly
[16:21] <sbasuita> =/
[16:21] <gordonjcp> oh okay
[16:22] <sbasuita> Anybody spot a mistake?
[16:22] <sbasuita> text a l i e n 1
[16:22] <sbasuita> sept 1100001 1101100 1101001 1100101 1101110 110001
[16:22] <sbasuita> oct 11100001 11101100 11001001 11010101 11000110 1
[16:22] <sbasuita> hex E1 EC C9 D5 C6 01
[16:22] <gordonjcp> yeah
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[16:23] <gordonjcp> why is the upper bit set?
[16:23] <sbasuita> gordonjcp, upper bit?
[16:24] <gordonjcp> why is bit 7 in the code for "a" set?
[16:24] <gordonjcp> should be 97, you have 225
[16:25] <gordonjcp> (if you're sending ascii, which you might not be)
[16:25] <sbasuita> gordonjcp, it's a weird packed format
[16:25] <sbasuita> gordonjcp, http://www.dreamfabric.com/sms/hello.html
[16:25] <gordonjcp> oh, okay
[16:27] <sbasuita> Oh, damn.
[16:28] <sbasuita> I was taking the leftmost bits, instead of the rightmost bits in the conversion :P
[16:29] <gordonjcp> mmm-hm
[16:29] <gordonjcp> be careful of that
[16:30] <sbasuita> Just me being generally tired and careless as usual ;)
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[16:30] <shellevil> sbasuita: working now?
[16:30] <shellevil> lo edmoore
[16:30] <sbasuita> shellevil, yes, sending sms works
[16:31] <sbasuita> shellevil, just about to fire off a third one to see if i've got the actual text sorted
[16:31] <shellevil> :)
[16:31] <shellevil> t-mob is offering 1000 texts with a new PAYG SIM ATM IIRC
[16:32] <sbasuita> shellevil, yep
[16:38] Action: sbasuita sends off the third text
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[16:39] <sbasuita> Now we play the waiting game and see if Daniel is too cheap to fork out international text rates
[16:39] <sbasuita> He wasn't
[16:39] <sbasuita> It works
[16:40] <sbasuita> celebration
[16:50] <edmoore_> rjharrison: http://www.metro.co.uk/news/article.html?Cartoon_launched_into_space_for_alien_premiere&in_article_id=611366&in_page_id=34
[16:51] <sbasuita> edmoore_, blasted!?
[16:51] <edmoore_> at 4m/s, yes
[16:52] <edmoore_> and without any momentum exchange due to gas, yes
[16:52] <edmoore_> infact completely not blasted
[16:52] <sbasuita> "propelled high into the outer universe"
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[17:09] <jcoxon> afternoon all
[17:09] <jcoxon> natrium42, my pcb to olimex got accepted - i'm suprised!
[17:11] <shellevil> why
[17:13] <jcoxon> it was a first attempt
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[17:18] <shellevil> ah
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[17:25] Nick change: edmoore -> m0tek
[17:27] <rjharrison> Yo m0tek nice one
[17:27] <rjharrison> No wonder you wanted the payliad back
[17:27] <rjharrison> load
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[17:40] <m0tek> sorry rjharrison, was on the phone
[17:40] <rjharrison> hehe I know
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[17:40] <rjharrison> I tried to call
[17:40] <m0tek> yeah we are glad we got it back - had a lot riding on it
[17:44] Nick change: stilldave -> stilldavid
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[19:19] <jcoxon> rjharrison, ping
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[19:49] <m0tek> jcoxon: kd7lmo has passed away
[19:50] <m0tek> knocked off his bicycle by a drunk driver
[19:50] <icez> eek
[19:50] <m0tek> kd7lmo.net
[19:51] <m0tek> the guy was a first class engineer
[19:51] <icez> hey that's the guy that lives here
[19:51] <icez> never met him but I somewhat knew him from his ANSR
[19:57] <shellevil> :/
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[20:18] <jcoxon> m0tek, oh thats awful
[20:18] <m0tek> I know
[20:18] <jcoxon> he was an incredible engineer
[20:18] <jcoxon> the best
[20:19] <jcoxon> just got the email through
[20:19] <Hiena> What happend?
[20:20] <m0tek> right, I'm heading back to cambridge
[20:20] <m0tek> bac later
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[20:24] <Hiena> Hey, jcoxon what is the news?
[20:24] <jcoxon> kd7lmo has passed away
[20:24] <jcoxon> he was an american who was an expert in amateur ballooning
[20:24] <jcoxon> http://www.kd7lmo.net/index.html
[20:25] <Hiena> I know his site.
[20:26] <Hiena> What happend with him?
[20:28] <icez> <m0tek> knocked off his bicycle by a drunk driver
[20:28] <Hiena> Geeee...
[20:31] <Hiena> It's sad. Very-very, sad...
[20:32] <icez> and he pretty much had the _only_ ballooning group in the state
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[21:21] <Laurenceb> hello
[21:21] <shellevil> heloo
[21:21] <Laurenceb> anyone have an idea what the FM deviation is usually used by HAMS ?
[21:21] <sbasuita> aight
[21:21] <Laurenceb> on narrowband FM?
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[21:29] <stilldavid> I _should_ know :(
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[21:39] <jcoxon> ping rjharrison
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[22:12] <jcoxon> evening all
[22:12] <jcoxon> hows everyone?
[22:30] <natrium42> hey jcoxon
[22:31] <jcoxon> hey natrium42
[22:31] <jcoxon> hows it going?
[22:31] <natrium42> good, how are you?
[22:31] <jcoxon> not bad thanks
[22:32] <jcoxon> have had a good day
[22:32] <jcoxon> and got some new wire strippers :-)
[22:32] <natrium42> hehe
[22:32] <natrium42> did olimex say when they will ship your PCB?
[22:32] <jcoxon> yeah 3-5 days when i fax my card details
[22:33] <jcoxon> need to find a fax machine
[22:34] <natrium42> could split CC number across 2 emails
[22:36] <jcoxon> don't want to mess with olimex they might get grumpy
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[22:43] <SpeedEvil> I'm unsure if I've posted http://bifferos.bizhat.com/ before - network problems - 26 pound 486/1Watt/USB host
[22:47] <jcoxon> interesting
[22:48] <SpeedEvil> It's got sucky IO though, which is annoying.
[22:48] <SpeedEvil> But you can hook up cheap USB crap to it.
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[22:48] <jcoxon> its good value though
[22:49] <SpeedEvil> Mass-storage + webcams + USB soundcard + ...
[22:49] <jcoxon> :-)
[22:50] G8KHW (n=Steve@217.47.75.8) joined #highaltitude.
[22:50] <G8KHW> hey all
[22:51] <G8KHW> jcoxon: I have a DL format Q
[22:52] <G8KHW> I asssume each message is terminated with a LF and or CR to air
[22:52] <jcoxon> at present yes
[22:53] <G8KHW> and that empty fields need no space between commas
[22:53] <G8KHW> and that trailing fields may be ommited
[22:53] <jcoxon> no spaces
[22:54] <jcoxon> well its best to pre submit an example string to rjharrison as he'll update the server accordingly
[22:54] <jcoxon> the key is the starting $$
[22:54] <jcoxon> as thats how we split sentences
[22:54] <G8KHW> OK - i'll do that
[22:55] <G8KHW> what about additional fields like comments - e.g. pyro fired
[22:55] <jcoxon> thats no problem
[22:55] <jcoxon> we ignore it
[22:56] <jcoxon> but its in the raw data
[22:56] <jcoxon> so its accessible
[22:56] <G8KHW> I was thinking of adding a comment on the end of the line rather tan a seperate line
[22:56] <G8KHW> than
[22:57] <G8KHW> ?
[22:57] <jcoxon> yeah if possible keep it in a single string
[22:57] <jcoxon> well at present the DL system can't cope with more then one type of telem string
[22:59] <G8KHW> ta I'll submit a sample to rjharrison
[22:59] <jcoxon> great
[22:59] <jcoxon> i've got a few new ideas for the telem string
[22:59] <jcoxon> such as adding 'stop' character at the end
[23:00] <jcoxon> as it'll help us to search out strings embedded in junk
[23:00] <G8KHW> what about a checksum
[23:00] <SpeedEvil> FEC!
[23:01] <jcoxon> at present that will go direct into the raw data
[23:01] <Laurenceb> there reed solomon on the wiki
[23:01] <jcoxon> yeah perhaps a checksum and also have a null checksum for code that doesn't actually do checksums
[23:01] <G8KHW> sure - just ommit it
[23:02] <jcoxon> i'll speak to rob see what he thinks but i think its a good idea
[23:02] <jcoxon> as it give the option
[23:03] <SpeedEvil> reed solomon is pointless with ASCII encoding though
[23:03] <SpeedEvil> err
[23:03] <SpeedEvil> RS232
[23:03] <Laurenceb> why
[23:03] <jcoxon> but the thing is i want a character that i can search for
[23:04] <jcoxon> to make sure i've got the end of the string
[23:04] <G8KHW> what about *
[23:04] <SpeedEvil> Laurenceb: a bit error 2/8ths or so of the time will nuke a framing bit
[23:04] <jcoxon> yeah i was thinking that
[23:04] <G8KHW> like NMEA
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[23:04] <G8KHW> then 2 hex digits
[23:04] <SpeedEvil> Laurenceb: which means one or more missing chars
[23:04] <G8KHW> then crlf
[23:04] <Laurenceb> yes
[23:04] <SpeedEvil> Laurenceb: or malformed chars
[23:04] <jcoxon> $$callsign,data,*XX
[23:05] <G8KHW> or $$callsign,data*XX like NMEA
[23:05] <Laurenceb> thats the issue with protocols like rtty
[23:05] <SpeedEvil> Laurenceb: not so much RTTY
[23:05] <SpeedEvil> Laurenceb: RTTY + hard decoders
[23:05] <Laurenceb> at least the way they are treated with fldigi
[23:05] <SpeedEvil> yeah
[23:05] <jcoxon> G8KHW, well its comma seperated through out 'data'
[23:06] <jcoxon> $$<CALL SIGN>,<INCREMENTAL COUNTER ID>,<TIME HH:MM:SS>,<LATITUDE DD.DDDDDD>,<LONGITUDE DD.DDDDDD>,<ALTITUDE METERS MMMMM>,<CUSTOM DATA>,*<CHECKSUM>
[23:08] <G8KHW> sure - its a v minor pointbut the last comma is wasted becuase the sequence will always be ,*
[23:09] <jcoxon> true
[23:09] <G8KHW> they decided to despense with it in nmea
[23:09] <jcoxon> nmea has it
[23:09] <jcoxon> well in some sentences it does
[23:09] <G8KHW> name that sequence
[23:10] <jcoxon> http://www.gpsinformation.org/dale/nmea.htm#GGA
[23:10] <G8KHW> http://aprs.gids.nl/nmea/#allgp
[23:10] <SpeedEvil> The way I came up with to mitigate against noise would be something like 4 byte packets - first is a sync and packet type. Second and third are data, fourth is checksum. So you send rapidly packets for N and S fine position (+-32768m or so), altitude, and occasionally packets for coarse position.
[23:11] <G8KHW> actually thats comma space star HH
[23:11] <SpeedEvil> But that gets to the point that you might as well do something properly with FEC
[23:11] <G8KHW> for the GGA message
[23:12] <jcoxon> okay, i'm happy dropping the last ,
[23:12] <jcoxon> it does make sense
[23:13] <G8KHW> I think the last fiels in $GPGGA is "DGPS reference station id" which is oftem blank (space)
[23:13] <jcoxon> yeah it is
[23:14] <jcoxon> okay will run it by rob but i think its a better idea to have the * then rely on new lines
[23:15] <G8KHW> sure - I cant think of a reason to have * in the data
[23:15] <G8KHW> so its a good unique character
[23:16] <G8KHW> anyroad its not worth getting hung up about
[23:17] <jcoxon> :-)
[23:17] <G8KHW> night all guys
[23:17] <jcoxon> i'll update the client
[23:17] <jcoxon> night
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[23:20] <jcoxon> okay guys, need some volunteers for a little project for next weekend
[23:21] <jcoxon> basically its the PBH-9 ZP 50 hour endurance launch in the US
[23:21] <jcoxon> which is transmitting on 30m and 40m
[23:21] <jcoxon> I want to setup some form of the DL Client to track
[23:22] <jcoxon> so need some volunteers with radios to run the code
[23:23] <SpeedEvil> 30m - 10MHz?
[23:23] Action: SpeedEvil wonders about his broken scanner.
[23:25] <jcoxon> yeah
[23:25] <jcoxon> so 7MHz and 10MHz
[23:27] <stilldavid> where are they planning on it going? ... for 50 hours?!
[23:28] <Laurenceb> SpeedEvil: I picked up an icom for £150 on ebay
[23:28] <jcoxon> stilldavid, tis a good question
[23:28] <jcoxon> last time it floated out tosea and then north over newfoundland where they cutdown
[23:28] <jcoxon> to sea*
[23:29] <SpeedEvil> Laurenceb: yeah - ATM I'm really strapped for cash though.
[23:30] <stilldavid> not my direction unfortunately, but sounds like a crazy project
[23:30] <SpeedEvil> Laurenceb: existing scanner is somewhat deaf - and was ~1990 or so. I was wondering if I could fix the - possibly - busted front end.
[23:31] <Laurenceb> or... you could build a scanner
[23:31] <SpeedEvil> true.
[23:31] <jcoxon> stilldavid, well any help is great even if its not receiving
[23:31] <Laurenceb> I've got my design down to 5 ICs now
[23:31] <SpeedEvil> Laurenceb: it's not really complex.
[23:32] <SpeedEvil> Laurenceb: especially if you don't want digital out
[23:32] <Laurenceb> AD have solved all the issues
[23:32] <SpeedEvil> DCO of some form, mixer, IF
[23:32] <SpeedEvil> preamp, post-amp
[23:33] <jcoxon> stilldavid, where are you based?
[23:33] <stilldavid> jcoxon: northern california
[23:34] <stilldavid> wrong side of the US to be looking to the skies, unfortunately
[23:35] <jcoxon> oh certainly not
[23:35] <jcoxon> HAM?
[23:35] <jcoxon> Ham*?
[23:35] <Laurenceb> well LNA, ADL5387 6th order filter, dual channel differential amplifier IC, ATmega32U6 then an ADF4157 as a clock generator
[23:35] <stilldavid> just passed the test 2 days ago, looking to buy a radio... maybe this week? ;)
[23:36] <jcoxon> stilldavid, basically 40m at that altitude could defintiely be heard in california
[23:36] <jcoxon> considering last weekend we tested 400mW on the 40m band at an altitude of 60m
[23:36] <jcoxon> and it was received 1000km away
[23:36] <SpeedEvil> Laurenceb: what does the filter do - after the IF?
[23:36] <Laurenceb> low pass
[23:37] <SpeedEvil> on the antenna?
[23:37] <Laurenceb> its direct conversion
[23:37] <SpeedEvil> oh
[23:37] <Laurenceb> so its filtering the IF
[23:39] <Laurenceb> only issue is power consumption - ~1500mw
[23:41] <Laurenceb> with an milled alu usb stick its almost sensible
[23:42] <Laurenceb> gtg, cya all
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[23:45] <jcoxon> SpeedEvil, there are a number of kits that could be used
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[23:48] <jcoxon> SpeedEvil, ping
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[23:57] <jcoxon> shellevil, ?
[00:00] --- Tue Apr 14 2009