highaltitude.log.20100126

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[07:19] <Endeavour> Randomskk? What the deuce? :P
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[12:19] Action: Laurenceb_ has just finished a matlab sim of the chipcon transceiver
[12:19] <Laurenceb_> looks like 7dB noise figure
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[12:35] <SpeedEvil> Of the normal operating mode you mean?
[12:35] <SpeedEvil> based on the datasheet - or measurements?
[12:48] <Laurenceb_> based on datasheet
[12:48] <Laurenceb_> and peicing together how the dsp works
[12:52] <Laurenceb_> 3bit ADC then digital bandpass filter
[12:53] <Laurenceb_> interestingly there seems to be an issue with the way the FM discriminator works
[12:53] <Laurenceb_> as the modem and DSP filtering runs of multiples of the same clock
[12:54] <Laurenceb_> the datasheet recommends enabling frequency dithering on the transmitter, I'm guessing thats to reduce the issue
[12:55] <Laurenceb_> I worked out the noise figure based on replicating the datasheet specs with simmed hardware
[12:56] <SpeedEvil> ah
[12:56] <Laurenceb_> - so if you were to make a scanner by grabbing data from the front end using the spi interface, youd see 7dB noise figure on your processed data
[12:56] <SpeedEvil> that's not really horrible.
[12:56] <Laurenceb_> compared to say 2dB for the icom ic-7000
[12:56] <Laurenceb_> about the bast HAM kit
[12:56] <Laurenceb_> thats only 75% more range with the icom
[12:56] <SpeedEvil> yeah
[12:57] <Laurenceb_> there very cheap 1dB LNAs
[12:57] <Laurenceb_> *there are
[12:58] <Laurenceb_> but it might saturate the front end - not sure if its worth it
[12:58] <Laurenceb_> tho you could add an option to enable/disable the lna - the cc1020 even has a LNA pin for enabling an external lna
[13:01] <Laurenceb_> oh I discovered the issue with your N900 accels
[13:01] <Laurenceb_> its a problem with my code - when the gain is high it doesnt adjust the bias properly
[13:02] <Laurenceb_> need to rewrite it to use http://en.wikipedia.org/wiki/Moore%E2%80%93Penrose_pseudoinverse
[13:02] <Laurenceb_> rather than the dodgy vector technique I was using
[13:04] <SpeedEvil> with a filter - ...
[13:04] <SpeedEvil> ah
[13:05] <SpeedEvil> I mean - with a filter on the NA
[13:11] <Laurenceb_> gtg
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[13:18] <rjharrison> Hey edmoore
[13:18] <rjharrison> How was Avatar
[13:31] <edmoore> hi rjharrison
[13:31] <edmoore> very good thanks
[13:31] <edmoore> gave me all I wanted
[13:31] <edmoore> how are you?
[13:31] <edmoore> am only doing a flying visit btw. domestic half hour before getting back to work
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[17:34] <jcoxon> evening all
[17:34] <Randomskk> heya
[17:34] <sbasuita> hey jcoxon
[17:34] <sbasuita> jcoxon, sent your package ;)
[17:36] <jcoxon> sbasuita, oh thanks
[17:36] <jcoxon> haven't seen that radio in quite a while :-p
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[20:04] <MikeMc68> evening all
[20:09] <jcoxon> hey MikeMc68
[20:36] <MikeMc68> What's new guys?
[20:37] <jcoxon> :-) still not much new
[20:37] <jcoxon> still running sims on my flight computer
[20:37] <SpeedEvil> sims, or sims II?
[20:40] <MikeMc68> lol
[20:41] <jcoxon> though to make it more useful i've not got it graphing the various bits
[20:42] <jcoxon> now*
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[21:45] <jcoxon> evening ro
[21:45] <jcoxon> RocketBoy, *
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[22:13] <Laurenceb_> jcoxon: just got the sim results back from Rodger Farley
[22:14] <Laurenceb_> I'm just looking through... I'll send it along to you
[22:14] <jcoxon> oh yeah
[22:14] <jcoxon> brilliant - good work in contacting him
[22:14] <jcoxon> seems keen to help out
[22:14] <Laurenceb_> looks like 1.2Kg ballast drop per night
[22:14] <Laurenceb_> thats better than I was expecting
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[22:15] <jcoxon> Laurenceb_, do you have skype for tomorrow?
[22:16] <Laurenceb_> no mic :-/
[22:16] <Laurenceb_> I could buy one I guess
[22:16] <Laurenceb_> sent it to you
[22:17] <jcoxon> thanks
[22:18] <Laurenceb_> the bobbing period is interesting AIUI the sim code has no gravity waves
[22:18] <Laurenceb_> so that bobbing occurs even in the absence of gravity waves
[22:19] <Laurenceb_> I'm quite enthusiastic now - before I thought SNOX failed as its hard to control
[22:20] <Laurenceb_> but Rodger Farley thinks its not too hard for us to stay up for a few days
[22:20] <Laurenceb_> and so SNOX probably failed for some other reason
[22:21] <jcoxon> hmmm well they really didn't have much control
[22:21] <jcoxon> their ballast control was based on time of the solenoid being open
[22:21] <Laurenceb_> Rodger reacons you can do it with their drip technique
[22:22] <Laurenceb_> and its been done on scientific flights
[22:22] <Laurenceb_> with success
[22:22] <jcoxon> drip technique?
[22:22] <Laurenceb_> open solenoid and let it drip out
[22:22] <Laurenceb_> lol dont know why I called it that
[22:23] <Laurenceb_> I think he said "calibrated hole"
[22:23] <jcoxon> as in a constant drip through out the flight?
[22:23] <Laurenceb_> no, just using the time the valve is open
[22:24] <Laurenceb_> and ground calibrating
[22:24] <jcoxon> well with the peristaltic pump is a lot more accurate
[22:24] <Laurenceb_> yeah - he thinks its a much better way to do it
[22:24] <jcoxon> Laurenceb_, could you fw me your whole email correspondance - just out of interest
[22:24] <jcoxon> if its no hassle
[22:25] <MikeMc68> Where did you get the pump James ?
[22:26] <jcoxon> http://www.williamson-shop.co.uk/
[22:28] <MikeMc68> Cheaper than expected
[22:28] <MikeMc68> thank
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[22:31] <Laurenceb_> jcoxon: sent
[22:31] <Laurenceb_> think I included everything
[22:32] <Laurenceb_> I dont get why his sim only ran for 48hours
[22:34] <jcoxon> great
[22:37] <Laurenceb_> looks like we can realistically do it
[22:38] <jcoxon> i've always had faith
[22:38] <Laurenceb_> how long for the crossing were you looking at with hysplit?
[22:38] <jcoxon> about 4 days
[22:38] <Laurenceb_> so 3 nights?
[22:38] <jcoxon> well thats how long i ran it for
[22:38] <jcoxon> we could do it in 2 nights, 3 days quite easily
[22:39] <Laurenceb_> looks like we can easily float for 3 nights
[22:39] <Laurenceb_> but its be nice if he could rerun the sim for longer
[22:42] <Laurenceb_> hmm yeah looks like 4Kg ballast will easily give us 3 nights
[22:42] <Laurenceb_> that leaves us with 1.4Kg for hardware
[22:43] <Laurenceb_> pump is 300g ? then I was looking at about 650grams of lithiums
[22:43] <Laurenceb_> 950+ the insulation + the tronics hardware
[22:44] <jcoxon> yeah sounds about right
[22:44] <jcoxon> good to set some limitations
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[22:49] <jcoxon> right night all
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[00:00] --- Wed Jan 27 2010