highaltitude.log.20100426

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[11:19] <Laurenceb> http://hackaday.com/2010/04/25/rf-transmission-in-the-9-khz-band/
[11:19] <Laurenceb> ^ different
[13:33] <jonsowman> Laurenceb: quite cool
[13:34] <SpeedEvil> yep
[13:35] <SpeedEvil> though a quick skim says it's possibly the wrong way
[13:35] <SpeedEvil> the pros do it through ground contact
[13:35] <russss> I'm sure if coiled transmitters were feasible the military wouldn't have massive VLF antennas
[13:37] <SpeedEvil> it's not a coiled antenna
[13:37] <SpeedEvil> it's a conventional antenna, the coil is merely a high voltage resonant circuit
[13:37] <SpeedEvil> AIUI
[13:38] <juxta> I'd like to see our VLF array in western aus
[13:39] <russss> ah yes
[13:39] <russss> that hackaday article is misleading
[13:40] <SpeedEvil> also - it's sloppy
[13:40] <SpeedEvil> it's not a concrete cylinder
[13:40] <SpeedEvil> it's a cardboard cylinder - used to form concrete cylinders
[13:40] <russss> yeah
[13:40] <juxta> heh, a concrete cylinder might be a little impractical, especially sitting atop a bucket
[13:41] Action: SpeedEvil wonders how long an antenna he could do.
[13:41] <SpeedEvil> I think ~1km
[13:42] <SpeedEvil> (wire to bottom of stream past house, cable running along the bottom, insulated
[13:42] <SpeedEvil> contact at far end
[13:42] <Randomskk> you want ELF, shove electrodes into the ground, use the earth as your antenna
[13:42] <SpeedEvil> yes
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[19:59] <SpeedEvil> Laurenceb: what was that 6 axis cheapish chip again - I forgot the number
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[21:38] <earthshine> Can someone go to my website please - http://www.earthshineelectronics.com/ - and click the CONTACT link at the top and tell if if it works
[21:39] <jonsowman> earthshine: yup works fine
[21:39] <jonsowman> do you actually want me to test the contact form?
[21:39] <earthshine> no, just make sure it goes to the form
[21:39] <jonsowman> it does indeed
[21:39] <earthshine> someone was reporting it pops up an error when they click it
[21:40] <earthshine> but i've tested it in XP and OSX on 3 machines and 3 different browsers
[21:40] <earthshine> thanks
[21:40] <jonsowman> nope getting nothing here, firefox 3.6 on windows 7 pro
[21:40] <earthshine> cheers
[21:40] <jonsowman> http://browsershots.org/
[21:40] <jonsowman> might be worth trying
[21:42] <earthshine> cheers i'll try that
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[22:02] <russss> I got an FT-817ND off ebay :)
[22:02] <jonsowman> russss: nice
[22:02] <jonsowman> how much?
[22:03] <russss> £406 inc PNP, so I only saved like £40
[22:03] <jonsowman> better than nothing - nice one
[22:03] <russss> I was prepared to go up to £410, but someone only bid me up to £406.
[22:03] <russss> their loss :P
[22:04] <fsphil> no warranty though :p
[22:05] <russss> meh, true
[22:05] <russss> it's in original packaging
[22:05] <russss> if it's out of warranty it probably won't break anyway
[22:07] <jonsowman> i really need to get a radio, cant afford one at the moment though :(
[22:09] <Laurenceb> SpeedEvil: LSM303DHL
[22:09] Action: Laurenceb just got back
[22:10] <Laurenceb> on the subject of VLF (sorry topic from ages ago) I made a tabletop receiver years ago that could pick up sub comms
[22:11] <Laurenceb> just a 10cm diameter copper sheets on the top and bottom of a perspex tube and some very good opamps
[22:12] <Laurenceb> picked up the russian timemarks and sub broadcasts
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[22:14] <Laurenceb> http://www.vlf.it/immagine/minimal_E.html
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[22:25] <SpeedEvil> ah
[22:26] <SpeedEvil> Laurenceb: neat. 10cm tx would be really neat :)
[22:28] <fsphil> there was a VLF transmitter on hackaday recently
[22:28] <fsphil> 8.9khz
[22:28] <jonsowman> fsphil: yeh that was interesting
[22:28] <jonsowman> ELF is where it's at
[22:28] <fsphil> everyone loves an elf
[22:28] <jonsowman> haha
[22:29] <Laurenceb> elf bowl
[22:29] <Laurenceb> anyone remember that?
[22:29] <jonsowman> 76Hz, awesome]
[22:30] <fsphil> wavelengths the size of planets
[22:31] <jonsowman> 3600km band
[22:31] <jonsowman> lol
[22:32] <fsphil> I tried transmitting 11khz with nothing more than a sound card and wire -- epic fail
[22:33] <jonsowman> we managed to get 36MHz out of an ARM PWMing a bit of wire
[22:33] <jonsowman> could pick it up a few metres away
[22:33] <jonsowman> transmitting morse
[22:33] <fsphil> any filtering?
[22:34] <jonsowman> nope
[22:34] <jonsowman> nothing at all lol
[22:37] <DanielRichman> is that an amateur band?
[22:38] <jonsowman> what, 36MHz?
[22:38] <DanielRichman> mmm
[22:38] <jonsowman> no its just half the ARMs core clock
[22:38] <DanielRichman> awesome you broke the law with PWM
[22:38] <jonsowman> it transmitted about 5metres at max though
[22:38] <jonsowman> and that was listening with an IC7000 which is v sensitive
[22:38] <DanielRichman> but GCHQ have biiig antennas; they're coming for you
[22:39] <jonsowman> haha
[22:39] <DanielRichman> they're also coming for sbasuita because he accidentally 20W rather than 10
[22:41] <sbasuita> i did?
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[22:42] <DanielRichman> actually I think it was more like 100W
[22:42] <sbasuita> i don't remember that
[22:43] <DanielRichman> Joe forgot to turn down the power on the HF transmitter
[22:43] <DanielRichman> and you started CQing
[22:43] <sbasuita> o
[22:43] <sbasuita> safe
[22:44] <DanielRichman> sbasuita, catce form
[22:52] <sbasuita> DanielRichman: when do we have to give it by?
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[23:00] <DanielRichman> sbasuita, you should give it in tomorrow
[23:01] <sbasuita> DanielRichman: nah not tommorrow ;P
[23:02] <DanielRichman> sbasuita, I'm serious
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[23:04] <sbasuita> wtf
[23:04] <sbasuita> they want my card details on the catce
[23:04] <sbasuita> but they don't even specify a price
[23:04] <sbasuita> i'm supposed to sign that?!
[23:05] <DanielRichman> sbasuita, cheque
[23:05] <DanielRichman> sbasuita, 27.50 iirc
[23:05] <DanielRichman> sbasuita, cheque or cash
[23:05] <DanielRichman> sbasuita, the deadline will be before next week's meet
[23:06] <sbasuita> DanielRichman: 4th may?
[23:06] <DanielRichman> sbasuita, just do it/
[23:06] <Randomskk> yea do cheques for catce
[23:06] <Randomskk> writing out card details is never fun
[23:06] <sbasuita> gave out my card details for first time today
[23:06] <sbasuita> amazon
[23:07] <sbasuita> was too easy to order stuff
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[23:07] <sbasuita> :/
[23:07] <DanielRichman> :D
[23:07] <DanielRichman> do amazon accept paypal?
[23:07] <sbasuita> forget paypal
[23:07] <sbasuita> they steal _everybody's_ money
[23:08] <DanielRichman> paypal is indeed a pile of ...
[23:08] <Randomskk> card details are fantastic
[23:08] <Randomskk> just wait until you get a credit card
[23:08] <DanielRichman> but then atleast you only have to trust one person with your card details
[23:08] <DanielRichman> google checkout mebe?
[23:08] <sbasuita> not more google mining
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[23:09] <sbasuita> i want barclays to call me every time somebody tries to take money off my card without pin
[23:09] <sbasuita> is that too much to ask? :P
[23:09] <DanielRichman> oh stop slitting your wrists; who would you rather trust, small business or paypal?
[23:10] <Randomskk> tbh you will find it is safer than you imagine
[23:10] <DanielRichman> sbasuita, you could set up an account linked to your card and transfer a small amount into the dodgey-account
[23:10] <DanielRichman> from your safe account
[23:10] <Randomskk> also barclays will be annoying and block transactions you actually want to go through even when you do their 3d secure thing
[23:10] <DanielRichman> oh I hate that
[23:10] <Randomskk> that's way more effort than it's honestly worth unless you have like, lots of money
[23:10] <Randomskk> in which case it should be invested or in savings anyway
[23:10] <DanielRichman> which you only brows from a virtualboxed xen super secure no javascript flash openbsd wipes changes on reboot
[23:11] <sbasuita> i called up barclays phone banking to ask my balance once
[23:11] <sbasuita> the guy was genuinely disgruntled that i didn't use the online service and my reason was 'meh, i prefer talking to somebody'
[23:11] <sbasuita> he mentioned it several times
[23:12] <SpeedEvil> sbasuita: he has to
[23:12] <SpeedEvil> sbasuita: he has a script
[23:12] <sbasuita> :(
[23:12] <SpeedEvil> sbasuita: most everyone you talk to in a call centre has a script
[23:12] <sbasuita> yeah i guess i shouldn't really complain if a call centre worker is grumpy
[23:16] <DanielRichman> sbasuita, see you tomorrow; don't forget your catce form. I'll get you an intermediate practical assessment form if I remember but that's not crucial
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[00:00] --- Tue Apr 27 2010