highaltitude.log.20100311

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[00:27] <ProjectCirrus> sorry i was away from pc fsphil
[00:27] <ProjectCirrus> things are good, all applications sent
[00:27] <MikeMc68> hi
[00:27] <MikeMc68> back from hackspace
[00:28] <ProjectCirrus> 5 applications were a pain, had to buy 34 quids worth of maps
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[04:36] Nick change: jos -> Jos
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[04:40] <natrium42> yo rjharrison_eee
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[06:15] <rjharrison> morning all
[06:15] <rjharrison> Trust were all well
[06:15] <rjharrison> we're
[06:16] <rjharrison> going to make T
[06:16] <natrium42> hey rjharrison
[06:16] <natrium42> what kind of T?
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[06:28] <rjharrison> natrium42 the Tea type :)
[06:29] <rjharrison> Long day at work today
[06:32] <rjharrison> Laters all
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[07:26] <natrium42> sbasuita!!!
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[07:26] <natrium42> how are the winds?
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[10:17] <jonsowman> morning all
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[11:27] <jonsowman> hi edmoore
[11:28] <pschulz01> juxta: Ping
[11:28] <edmoore> hi jonsowman
[11:28] <jonsowman> hows things?
[11:28] <edmoore> so we are keeping the basement room for a few months
[11:28] <jonsowman> oh right
[11:29] <jonsowman> is this a "we'll see what happens in a few months" or is there somewhere else planned for us?
[11:30] <edmoore> oh, lord knows
[11:30] <jonsowman> i see
[11:30] <edmoore> he's said we'll have an actual place designed for student projects
[11:31] <edmoore> but words and what actually happens have a very low correlation
[11:31] <jonsowman> so it would seem
[11:32] <jonsowman> havent seen the baker basement lab yet
[11:32] <jonsowman> is it key/card access?
[11:32] <edmoore> still, there'll be some ventillation fitted to the basement room
[11:32] <edmoore> key
[11:32] <edmoore> we'll be getting keys
[11:32] <jonsowman> right ok
[11:32] <jonsowman> well some ventilation is better than none
[11:33] <edmoore> quite
[11:33] <jonsowman> is all the stuff in the new lab now?
[11:39] <edmoore> we can't get in until monday as it's currently occupied by the bulk superconductivity group
[11:39] <SpeedEvil> Need to put the heating on after they're done. :)
[11:40] <jonsowman> edmoore: oh right
[11:40] <jonsowman> i'm leaving the day after tomorrow
[11:40] <edmoore> ok, not to worry
[11:40] <edmoore> though we will probs be in on friday
[11:40] <jonsowman> edmoore: ie. tomorrow?
[11:41] <edmoore> yes
[11:41] <jonsowman> could you let me know what times you'll be in when you know?
[11:41] <jonsowman> would like to see the new lab
[11:42] <edmoore> probably from 10ish tomorrow
[11:42] <jonsowman> okay cool
[11:52] <jonsowman> bbl
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[12:10] <MikeMc68_Mobile> howdy
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[12:25] <juxta> pschulz01: hey there
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[13:12] <pschulz01> juxta: Hello.. sorry for the delay. Still here?
[13:13] <juxta> yup
[13:13] <juxta> how's things?
[13:13] <pschulz01> Do you have any 'plans/notes' on the antenna that you are using?
[13:13] <pschulz01> juxta: I'm good.. hacking on xlog.
[13:14] <juxta> which antenna pschulz01? the magnetic mount on the roof of the car?
[13:14] <juxta> or the yagi?
[13:14] <pschulz01> both :)
[13:15] <pschulz01> Was there a reason you had the whip off?
[13:15] <juxta> ah - 2 antennas on that mount
[13:15] <juxta> one is a 1/4 wave, which is good when the balloon is up
[13:15] <pschulz01> I'm also interested in the yagi as well
[13:16] <juxta> the other is a 1/4 wave stacked with a 1/2 wave, more gain, but not so good when the balloon is up high
[13:16] <juxta> (the black one you saw me put up is the 1/4 + 1/2 stacked)
[13:16] <pschulz01> Ok. How high does it get?
[13:16] <juxta> it's more about the angle of elevation to the balloon
[13:16] <juxta> the 1/4 wave has maximum gain at say 45 degrees
[13:17] <juxta> the other one would be much lower
[13:17] <pschulz01> Is range an issue?
[13:17] <juxta> when the balloon is down low it is
[13:17] <juxta> at the time i was swapping antennas it was at about 1.5km
[13:17] <juxta> (and about 50km away)
[13:18] <juxta> so only 1 degree of elevation or so
[13:18] <juxta> I sent you an email with some yagi stuff in it, that simple little design in the image is really nifty
[13:18] <juxta> you could make it out of anything really
[13:18] <juxta> once the balloon is up high range isnt really a problem
[13:19] <pschulz01> That would be great.
[13:32] Nick change: juxta -> juxta|afk
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[14:18] Nick change: juxta|afk -> juxta
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[15:38] <Mikemc68_mobile2> Hi
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[15:42] <Mikemc68_mobile2> Anything happening this weekend?
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[16:45] <MikeMc68> haloa
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[16:48] Nick change: MikeMc68 -> EarthshineDesign
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[17:12] <DanielRichman> So: the plan was to build a slimjim on a piece of 2m+ PVC rigid white pipe with 1.5mm tinned copper wire - however, I spoke to someone today who reckoned that any length of unsupported PVC > 1m long, or perhaps 1.5 if moutned vertically, wouldn't cope very well and would deform very nastily over the course of a couple of summers and winters; he recommended using wood (dielectric properties or smth.?). Is this a real issue (anten
[17:12] <DanielRichman> na will be mounted on roof); is wood a viable alternative/any other material suggestions?
[17:13] <SpeedEvil> bamboo works
[17:13] <SpeedEvil> well
[17:13] <SpeedEvil> paint it
[17:13] <sbasuita> also you're helping the pandas
[17:13] <sbasuita> the 7 day prediction is messing around in france :(
[17:16] <EarthshineDesign> sbasuita are you in France ?
[17:16] <sbasuita> EarthshineDesign, nope
[17:16] <sbasuita> EarthshineDesign, i'm in southeast england
[17:16] <EarthshineDesign> ok
[17:16] <EarthshineDesign> same as me then
[17:17] <sbasuita> EarthshineDesign, http://www.srcf.ucam.org/cuspaceflight/hourly-predictions/ <--- this is set to the parameters of our ALIEN payload
[17:17] <sbasuita> (camb launch)
[17:17] <SpeedEvil> I have a ~7m bamboo mast - works well
[17:18] <SpeedEvil> (made out of 3 sections of 2.4m or so bamboo
[17:19] <EarthshineDesign> 7metre s?
[17:19] <EarthshineDesign> To go on the payloadf ?
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[17:20] <SpeedEvil> EarthshineDesign: no - to pick up 3G
[17:20] <DanielRichman> SpeedEvil, cool, ok. What supplier?
[17:20] <SpeedEvil> Focus.
[17:20] <EarthshineDesign> Pick up 3G on what ?
[17:21] <SpeedEvil> Or homebase, I forget.
[17:21] <EarthshineDesign> explain
[17:21] <SpeedEvil> 3G modem from vodafone
[17:21] <SpeedEvil> which gets no signal in my house.
[17:21] <EarthshineDesign> Ahh I see
[17:22] <russss> heh
[17:24] <EarthshineDesign> vodafone usually have good coverage
[17:25] <DanielRichman> SpeedEvil, by what means did you attach the 2.4m pieces together? Also - the painting is to insulate it, right? Any spray paint will do?
[17:33] <SpeedEvil> DanielRichman: no - weatherproofing.
[17:33] <SpeedEvil> DanielRichman: Baler twine
[17:33] <SpeedEvil> I have a V2 which is wired together.
[17:34] <SpeedEvil> But for under a fiver or so...
[17:34] <DanielRichman> ok
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[17:55] <DanielRichman> SpeedEvil, no hits on focus' or wickes' website for "bamboo" - but it did show a few "bamboo canes" which look like they're not the right stuff. (unless http://www.wickes.co.uk/Bamboo-Canes/invt/187767 is the stuff you meant.
[17:55] EarthshineDesign (~mmcrobert@bb-87-80-136-184.ukonline.co.uk) joined #highaltitude.
[17:55] <DanielRichman> B&Q does however show http://www.diy.com/diy/jsp/bq/nav.jsp?action=detail&fh_secondid=9426462&fh_view_size=10&fh_location=//catalog01/en_GB&fh_search=bamboo&fh_eds=ß&fh_refview=search&ts=1268329931533&isSearch=true
[17:56] <DanielRichman> I think I might use a bamboo mast but construct the antenna itself on a piece of pvc then attach the two together
[17:56] <EarthshineDesign> test
[17:56] <DanielRichman> pong!
[17:56] <EarthshineDesign> ping randomskk
[17:56] <SpeedEvil> Ordinary bamboo canes - sold for propping up plants and general garden purposes
[17:56] <SpeedEvil> Lashed together with string
[17:57] <DanielRichman> Ah, ok. I will have a look in the shop
[17:57] <SpeedEvil> they are very light for their strength.
[17:57] <SpeedEvil> All garden centres will have them
[17:57] <DanielRichman> Couldn't you disassemble the bundles and then 'stagger' them so that you don't need any actual connections
[17:57] <DanielRichman> ie move half of each bundle up by 0.5m and re-bundle
[17:58] <SpeedEvil> they were overlapped by ~0.7m or so IIRC
[17:58] <SpeedEvil> And tied together
[17:58] <SpeedEvil> 1 cane, then 3, then 5
[17:58] <DanielRichman> Ok
[17:59] <SpeedEvil> Selecting uncracked canes is a good plan
[17:59] <SpeedEvil> and paint helps it last several more years
[18:00] <DanielRichman> I see
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[18:04] <EarthshineDesign> test
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[18:26] <EarthshineDesign> anyone know how to use irssi ?
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[18:29] <JohnTed> http://www.beyond62.com/2010/01/21/high-altitude-photography/
[18:29] <JohnTed> Anyone rig up a picavet ever?
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[18:35] Nick change: mmcroberts1 -> EarthshineDesign
[18:38] <EarthshineDesign> hello
[18:45] <jonsowman> EarthshineDesign: what was it you wanted to know re irssi?
[18:46] <EarthshineDesign> scripts
[18:46] <EarthshineDesign> i load a script but nothing seems to happen
[18:46] <jonsowman> which script?
[18:46] <EarthshineDesign> nickcolor.pl
[18:46] <EarthshineDesign> actually now i see the nick's are different colours
[18:46] <EarthshineDesign> except your one was yellow and then next message was black
[18:47] <jonsowman> it will be yellow if i include your nick, to alert you that the message was for you
[18:47] <jonsowman> as follows
[18:47] <jonsowman> hi EarthshineDesign
[18:47] <EarthshineDesign> ahh
[18:47] <EarthshineDesign> no that stayed black
[18:47] <jonsowman> EarthshineDesign: hi
[18:47] <EarthshineDesign> that worked
[18:48] <jonsowman> sorry yeh, your name has to be said at the start of the message
[18:48] <jonsowman> EarthshineDesign: hi
[18:48] <jonsowman> works
[18:48] <jonsowman> hi EarthshineDesign
[18:48] <jonsowman> doesnt
[18:49] <EarthshineDesign> k
[18:49] <EarthshineDesign> thanks
[18:49] <jonsowman> np :)
[18:49] <jonsowman> ping edmoore
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[18:50] <EarthshineDesign> hmm
[18:50] <EarthshineDesign> a script called nicklist.pl isn't working
[18:51] <jonsowman> script load nicklist.pl
[18:51] <jonsowman> doesnt work?
[18:51] <EarthshineDesign> oh hang on i need to set up parameters first
[18:51] <EarthshineDesign> it's documented in the source code
[18:52] <jonsowman> ah right
[18:52] <EarthshineDesign> is there an easy way to change the background colour ?
[18:53] <jonsowman> of the chat window?
[18:53] <EarthshineDesign> yeah
[18:53] <jonsowman> hmm not that i know of actually
[18:54] <jonsowman> never looked through, i prefer black
[18:55] <EarthshineDesign> weird
[18:56] <EarthshineDesign> grrr
[18:59] <EarthshineDesign> hmm
[18:59] <jonsowman> http://www.irssi.org/themes
[18:59] <jonsowman> admittedly *most* have dark backgrounds
[18:59] <EarthshineDesign> ok i changed a theme that is meant to give a dark background
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[18:59] <EarthshineDesign> it changed the text to green but the background is still white
[18:59] <jonsowman> how odd
[19:00] Action: SpeedEvil is using xchat and pidgin
[19:00] <EarthshineDesign> unless it's a dodgy theme file
[19:00] <jonsowman> yeh could well be
[19:01] <jonsowman> could try another one, then "set theme xyz"
[19:02] <EarthshineDesign> hmm
[19:02] <jonsowman> any good?
[19:02] <EarthshineDesign> tried another one - fonts changed - background the same
[19:02] <jonsowman> is your default terminal background colour set to white?
[19:03] <EarthshineDesign> ahh
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[19:03] <EarthshineDesign> dumbass
[19:03] <EarthshineDesign> sorted
[19:04] <jonsowman> :)
[19:04] <jonsowman> good good
[19:04] <EarthshineDesign> DOH!!
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[19:05] <EarthshineDesign> cool
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[19:07] <EarthshineDesign> can someone PM me pls
[19:08] <EarthshineDesign> I want to see how PM's show up
[19:12] <EarthshineDesign> thanks
[19:12] <jonsowman> no probs
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[19:18] <EarthshineDesign> did someone say there wa a laucnh this weekend ?
[19:18] <jonsowman> icarus III and alien are both looking to launch this weekend
[19:18] <jonsowman> weather isnt looking great afaik
[19:18] <EarthshineDesign> cool
[19:18] <jonsowman> http://www.srcf.ucam.org/~cuspaceflight/hourly-predictions/#
[19:19] <jonsowman> that is set up for alien's payload parameters but you get the idea
[19:19] <EarthshineDesign> are these payloads for imaging or something else ?
[19:20] <jonsowman> alien is a GCSE group from surrey
[19:20] <jonsowman> http://ukhas.org.uk/projects:alien
[19:20] <jonsowman> not sure on the aims for icarus
[19:21] <EarthshineDesign> ok
[19:22] <sbasuita> alien def won't launch this weekend; and we're from berkshire ;)
[19:22] <jonsowman> sbasuita: hmm woops, sorry
[19:23] <jonsowman> sbasuita: not sure where i got surrey from
[19:23] <sbasuita> jonsowman, no worries ;P
[19:23] <jonsowman> sbasuita: why not this weekend? weather?
[19:23] <sbasuita> jonsowman, yep, also too short notice now anyway
[19:24] <jonsowman> yes fair enough
[19:24] <jonsowman> hopefully the weather will be better soon
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[19:38] <EarthshineDesign> hi rick
[19:38] <LazyLeopard> Hiya
[19:38] <LazyLeopard> New nick.
[19:41] <EarthshineDesign> yeah
[19:41] <EarthshineDesign> i might change it again
[19:41] <EarthshineDesign> lol
[19:41] <EarthshineDesign> hmm now scripts in irsso are not running at all
[19:41] <EarthshineDesign> irssi
[19:42] <EarthshineDesign> Irssi: Unknown command: scripts
[19:42] <LazyLeopard> Long nick is loooooong</lolcat>
[19:42] <jonsowman> /script load xyz.pl
[19:42] <jonsowman> im pretty sure /run xyz.pl works too
[19:42] <EarthshineDesign> did that
[19:43] <EarthshineDesign> unknown command
[19:43] <jonsowman> hmm weird, that should work
[19:43] <jonsowman> "script" not "scripts" yes?
[19:43] <EarthshineDesign> yeah
[19:43] <jonsowman> very odd
[19:44] <jonsowman> try restarting irssi maybe?
[19:44] <EarthshineDesign> k brb
[19:44] <jonsowman> ok
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[19:47] <mmcroberts1> unknown command script
[19:47] <mmcroberts1> wtf
[19:47] <jonsowman> thats really weird
[19:47] DanielRichman (~DanielRic@unaffiliated/danielrichman) left irc: Client Quit
[19:47] <jonsowman> what does just typing "/script" give?
[19:48] <mmcroberts1> same
[19:48] <jonsowman> odd
[19:49] <mmcroberts1> perl problem
[19:50] <jonsowman> man ln
[19:50] <jonsowman> oops wrong window
[19:50] <mmcroberts1> Irssi: Error loading module perl/core: dlopen(/opt/local/lib/irssi/modules/libperl_core.so, 10): image not found
[19:50] Nick change: mmcroberts1 -> Earthshine
[19:51] <jonsowman> Earthshine: what OS?
[19:52] <Earthshine> osx
[19:52] <jonsowman> ah, i see
[19:52] <jonsowman> output of "/load perl" please?
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[19:52] <Earthshine> as above
[19:52] <Earthshine> Irssi: Error loading module perl/core: dlopen(/opt/local/lib/irssi/modules/libperl_core.so, 10): image not found
[19:53] <jonsowman> how did you install irssi
[19:53] <Earthshine> macports
[19:53] <Earthshine> i think i need to set --with-perl=yes
[19:53] <jonsowman> ok you need to uninstall it and reinstall with perl
[19:53] <Earthshine> yeah
[19:53] <jonsowman> "sudo port install irssi + perl"
[19:53] <Earthshine> k brb
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[19:54] <jonsowman> ok
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[19:57] earthshine (~mmcrobert@bb-87-80-136-184.ukonline.co.uk) joined #highaltitude.
[19:57] <earthshine> success
[19:57] <earthshine> cool
[19:58] <jonsowman> earthshine: good good
[19:58] <earthshine> that's better
[19:58] <jonsowman> :)
[19:58] <earthshine> ok dinner time
[19:58] <earthshine> laters
[19:58] <jonsowman> cya
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[20:12] <Laurenceb> hi
[20:12] <SpeedEvil> hi
[20:12] <jonsowman> hi Laurenceb
[20:12] Action: SpeedEvil triwes tor emember what he meant to point laurenceb to.
[20:13] Action: Laurenceb has been very busy with other stuff
[20:13] <Laurenceb> building work etc
[20:13] <SpeedEvil> http://slashdot.org/
[20:13] <SpeedEvil> ah yes
[20:13] <Laurenceb> moved on to pcb layout now, but havent got too far
[20:13] <SpeedEvil> the ps3 controller reportedly has gyro+mag+accel
[20:14] Action: SpeedEvil has been playing with 2000W 50KHz transmitter.
[20:14] <Laurenceb> nice
[20:14] <Laurenceb> I'm getting confused by the silabs transceiver
[20:14] <SpeedEvil> (AKA induction hob)
[20:14] <Laurenceb> impedance matching
[20:14] <Laurenceb> interesting
[20:14] <Laurenceb> it seems the HopeRF moduls on sparkfun are utter fail
[20:15] <SpeedEvil> This is the one that you think you can get it to do sampling?
[20:15] <Laurenceb> no thtats the chipcon
[20:15] <Laurenceb> I have chipcon eval modules... another thing I need to get round to doing
[20:15] <jonsowman> edmoore: ping
[20:15] <Laurenceb> Im going for silabs as for uavs you dont need hundereds of Km range and crazy RF stuff going on
[20:16] <SpeedEvil> ah
[20:16] <SpeedEvil> I see
[20:16] <Laurenceb> but the impedance matching is a pain... you can use a Tx/Rx switch or have a network to do the matching
[20:16] <SpeedEvil> Laurenceb: why sparkfun bad?
[20:17] <Laurenceb> seems the design is quite clever - going switchless doesnt cost you much
[20:17] <Laurenceb> they dont have 180 degree phase imbalance on Rx negative and positive
[20:17] <Laurenceb> and screwed up the Tx impedance matching network
[20:17] <SpeedEvil> ah
[20:17] <Laurenceb> Rx its costing them 4.2dB, Tx 3
[20:18] <Laurenceb> I cant understand how they could be so stupid
[20:18] <Laurenceb> they took the design thats in the datasheet descrided as minimal BOM, useful for dual antenna
[20:19] <Laurenceb> then shoved an SPDT RF switch onto it
[20:20] <Laurenceb> silabs AN427 has a smith chart of the Rx frontend
[20:20] <SpeedEvil> that's what - 7dB if you're using both
[20:20] <Laurenceb> yes
[20:20] <SpeedEvil> So what - half the range?
[20:20] <Laurenceb> but youd be being naughty to use that much power in the UK
[20:20] <Laurenceb> yes
[20:21] <Laurenceb> so only the Rx loss, if you dont count the fact your using excessive current
[20:21] <Laurenceb> I've just done a layout for the matching network with no RF switch - from the datasheet
[20:22] <Laurenceb> looks like the entire thing is 10x20mm
[20:22] <SpeedEvil> how much is the SF module?
[20:22] <Laurenceb> with sma connector
[20:22] <Laurenceb> $12.50
[20:22] <SpeedEvil> not too bad.
[20:22] <Laurenceb> yeah not much over buying parts from mouser
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[20:23] <Laurenceb> the PA design is quite clever - just a NMOS fet
[20:23] <Laurenceb> driven with square wave
[20:23] <SpeedEvil> And a filter?
[20:24] <Laurenceb> yeah, but thats on the pcb
[20:24] <Laurenceb> filter and impedance matching
[20:25] <SpeedEvil> hmm
[20:25] <Laurenceb> it means you can get 100mw into 50 ohm with 3.3v supply
[20:25] <Laurenceb> and also when the Tx is off its just a parasitic capacitance
[20:25] <SpeedEvil> I'd have thought that that would be lots over limits at 3F
[20:25] <Laurenceb> so the matching network can accomodate that - so you dont lose RX performacne
[20:26] <Laurenceb> apparently not with the recommended filter network
[20:27] <Laurenceb> you seem to lose a bit of Tx efficency if you dont have a switch - as the RX pins in Tx mode present a resistive load
[20:27] <SpeedEvil> Ah. And it relies on people to actually check their designs for compliance...
[20:27] <Laurenceb> but that doesnt bother me as much
[20:27] <Laurenceb> yes
[20:27] <Laurenceb> atm I dont have any component values for the switchless matching network
[20:28] <Laurenceb> just smith charts for a network anylizer plugged into the pins that silabs provide
[20:29] <Laurenceb> I've got an icom pcr1000 that could be used to check for excessive RFI
[20:29] <Laurenceb> but yeah - the only advantage of the SF modules is that they are compliant
[20:29] <SpeedEvil> Do they actually say that?
[20:31] <Laurenceb> well - providing you set the power register to the correct level
[20:31] <Laurenceb> Hope RF have a test report
[20:31] <Laurenceb> it seems to show compliance
[20:32] <Laurenceb> it calls itself EN330-200
[20:32] <SpeedEvil> ah
[20:32] <Laurenceb> and was done by a German test lab
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[20:33] <Laurenceb> http://www.hoperf.com/rf_fsk/rfm22.htm
[20:33] <SpeedEvil> Sorry for making you dig - it was just an idle thought.
[20:33] <Laurenceb> lol at the RF22 IC
[20:34] <Laurenceb> thats just a repackaged si4432
[20:35] Action: Laurenceb realises he doesnt properly understand smith charts
[20:36] <Laurenceb> near to the circumference means the reflected wave has nearer to the same amplitude right?
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[20:36] Action: SpeedEvil knows they are wierd circularish things.
[20:36] <SpeedEvil> But little else.
[20:36] <Laurenceb> its just the normalised complex amplitude/phase of the reflected wave in the complex plane ?
[20:36] <Laurenceb> ok :p
[20:37] <SpeedEvil> Never done the mathematics of RF design.
[20:42] <Laurenceb> hmm the app note explains all the maths
[20:42] <Laurenceb> thats good
[20:43] <Laurenceb> take the reciprocal of the complex value from the chart then express it as a resistor in parallel with a cap or inductor, and thats the model for your pin
[20:43] <Laurenceb> seems to be it
[20:44] <SpeedEvil> that's quite simple
[20:44] <Laurenceb> then crunch through the network by hand/ use spice or something
[20:44] <Laurenceb> until it all matches
[20:44] <Laurenceb> thats the "fun" bit
[20:45] <SpeedEvil> Especially considering non-ideal components and PCB parasitics.
[20:45] <Laurenceb> yeah
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[20:51] <Laurenceb> bbl
[21:00] Nick change: Jos -> jos
[21:08] <earthshine> hey
[21:09] <jonsowman> yo
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[22:06] DoYouKnow (~c0cb88f6@gateway/web/freenode/x-vpwcxaqxppfsybvo) joined #highaltitude.
[22:06] <DoYouKnow> hi
[22:06] <jonsowman> hi DoYouKnow
[22:06] <DoYouKnow> hi jon
[22:07] rjharrison (~rharrison@vpn.hgf.com) joined #highaltitude.
[22:07] <rjharrison> Evening all
[22:07] <DoYouKnow> evening rjh
[22:07] <rjharrison> Just been on the M0 course
[22:07] <jonsowman> hi rob
[22:07] <jonsowman> nice
[22:07] <jonsowman> how did it go
[22:08] <rjharrison> hehe like the mane DoYouKnow
[22:08] <rjharrison> hi jonsowman
[22:08] <rjharrison> Oh fine'ish
[22:08] <jonsowman> good good
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[22:13] <earthshine> hi rjharrison
[22:13] <earthshine> oh he's gone
[22:14] jcoxon (~jcoxon@92.40.86.249.sub.mbb.three.co.uk) joined #highaltitude.
[22:14] <DoYouKnow> hi earthshine. cool nick
[22:16] <earthshine> :)
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[22:42] <earthshine> ji james
[22:42] <earthshine> *hi
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[22:56] <earthshine> night
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[23:09] natrium42 (~natrium@CPE000625d867e2-CM0014045885be.cpe.net.cable.rogers.com) joined #highaltitude.
[23:09] <natrium42> o/
[23:12] <jonsowman> hi natrium42
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[23:12] <natrium42> hi jon
[23:12] <jonsowman> hows you?
[23:13] <natrium42> good & you?
[23:13] <jonsowman> yeh fine thanks :)
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[23:14] <Randomskk> natrium42: so one of my friends here walked in and saw your name was like "wow are you talking to THE natrium42"
[23:15] <natrium42> omg, i is famous
[23:15] <jonsowman> Randomskk: ?
[23:15] <Randomskk> jonsowman: phil
[23:15] <jonsowman> intruiguing
[23:15] <Randomskk> wrt natrium42's exploits and adventures on the DS
[23:15] <natrium42> :)
[23:16] <jonsowman> i see
[23:16] <jonsowman> how cool
[23:16] <Randomskk> small world eh
[23:16] <Randomskk> well no, actually just that natrium42 is world famous
[23:16] <jonsowman> apparently so
[23:16] <natrium42> you guys :S
[23:17] <Randomskk> natrium42: well he's heard of you and is in another country
[23:17] <natrium42> i don't do much DS stuff lately, though
[23:17] <Randomskk> by definition...
[23:18] <natrium42> Randomskk, so... i kinda decided to go with python/pylons/extjs
[23:18] <natrium42> what do you think?
[23:18] Action: Randomskk <3 python
[23:18] <jonsowman> lol
[23:18] <natrium42> and probably sqlalchemy for ORM
[23:18] <Randomskk> sounds good
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[23:19] <natrium42> k, cool
[23:19] <natrium42> it will give me a chance to learn python better
[23:19] <natrium42> :)
[23:19] <fsphil> it's ssssimple
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[23:20] <jonsowman> fsphil: very good
[23:20] Action: fsphil gets his coat...
[23:20] <fsphil> sorry, bad habbit :)
[23:20] <jonsowman> haha
[23:20] Action: jonsowman shakes head
[23:20] Action: natrium42 stares in fsphil general direction
[23:21] <jonsowman> hahaa
[23:21] <fsphil> eep
[23:22] <fsphil> any electronics wizards here?
[23:23] <jonsowman> probably
[23:23] <jonsowman> what were you after? im sure someone here can help
[23:23] <fsphil> right.. let me see if I can explain this
[23:24] <fsphil> I've got a PWM signal, going through an RC filter to give me an analogue voltage between 0 and 3.3
[23:24] <fsphil> depending on the duty
[23:25] <fsphil> is there any way I can reduce the range to between say 1.0 and 1.2v
[23:25] <jonsowman> you mean 0% duty = 1V and 100% duty = 1.2V?
[23:25] <fsphil> yea
[23:26] <jonsowman> hmm nothing springs to mind straight away
[23:26] <jonsowman> ill have a think
[23:26] <jonsowman> bet someone else knows a quick and easy way of doing that
[23:26] <fsphil> I'm sure it's simple, but I can't think of it either
[23:26] <natrium42> add a voltage divider?
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[23:27] <Randomskk> I'm trying to remember how you do it so 0V input gives the 1V output
[23:27] <fsphil> that would bring the upper voltage down .. how do I get the lower voltage up a bit?
[23:27] <Randomskk> look into how R2R DAC ladders work, I think the theory may be similar
[23:29] <fsphil> true
[23:30] <fsphil> would the term "bias" be right, for increasing the minimum voltage?
[23:30] <jonsowman> yes i think so
[23:30] <jonsowman> not sure what else i'd call it
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[23:32] <Randomskk> fsphil: yea.
[23:32] <Laurenceb> SpeedEvil: the si4432 - looks like you fry the Rx
[23:33] <Laurenceb> if you use the no switch network and more than about 10dBm of Tx power
[23:33] <Laurenceb> as the nput impedance is 227 ohm, so the matching network from 50 ohm increases the voltage
[23:33] <SpeedEvil> Laurenceb: hmm.
[23:33] <Laurenceb> up to zero to 14v :(
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[23:34] <Laurenceb> the datasheet says low power only for the switchless design, but no specs
[23:34] <Laurenceb> just voltages
[23:34] <SpeedEvil> 10dBm is max legal anyway though?
[23:34] <Laurenceb> yeah
[23:34] <SpeedEvil> or were you wanting to use max power
[23:35] <Laurenceb> but if you have a frypocalipse if you misconfigure a register
[23:35] <Laurenceb> its not good at all
[23:35] <SpeedEvil> nope
[23:36] <SpeedEvil> how nasty is the required switch/
[23:36] <SpeedEvil> PIN?
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[23:42] <Laurenceb> 6 - SOT
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[23:42] <Laurenceb> its not too bad, uses up the GPIO pins on the si4432 - I was thinking of a flashing led but nvm
[23:43] <Laurenceb> http://uk.farnell.com/jsp/search/browse.jsp?N=1004534&Ns=PRICE_PLS_006_PRICE1|0
[23:43] <Laurenceb> top one looks fine
[23:43] <Laurenceb> also silabs have a proper app note for the split RX/Tx switched design, with component values etc, so nice and easy
[23:44] <Laurenceb> oh well time to zzz, cya
[23:45] <SpeedEvil> night
[23:45] <jonsowman> night Laurenceb
[23:45] <fsphil> g'night Laurenceb
[23:48] <fsphil> heading myself. thanks for the help guys - will experiment and report back :) g'night!
[23:48] fsphil (~phil@2001:470:1f09:483:21f:c6ff:fe44:b25b) left irc: Quit: Ka-boom!
[23:48] <jonsowman> see you
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[00:00] --- Fri Mar 12 2010