highaltitude.log.20090827

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[20:02] <rjharrison_home> Hi SpeedEvil
[20:03] <SpeedEvil> hi
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[22:06] <rjharrison_home> hhhhhi edmoore
[22:07] <rjharrison_home> heh
[22:07] <rjharrison_home> e
[22:07] <edmoore> hi rjharrison_home
[22:07] <rjharrison_home> weird
[22:07] <rjharrison_home> Sorry thought the girl on phone was gf
[22:07] <rjharrison_home> You got the order OK then
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[22:07] <edmoore> yes thank you - got back at lunch today
[22:07] <edmoore> yep, def not my gf :)
[22:09] <rjharrison_home> edmoore on here http://www.robertharrison.org/images/rtty/TEK0009.JPG there are some small spikes that alternate up then down I'm thinking it's not the oscilator at 8MHz... Any idea what that might be?
[22:09] <rjharrison_home> I guess I should unplug everything elase
[22:09] <rjharrison_home> else
[22:10] <rjharrison_home> The spikes are about +-10mv
[22:11] <edmoore> hrm, where are you metering from?
[22:12] <rjharrison_home> the input into the RM module
[22:13] <rjharrison_home> Don't worry about it too much it just seems a very consistant wiggle up and doen
[22:13] <rjharrison_home> windy tonight
[22:15] <SpeedEvil> what width are the spikes
[22:19] <rjharrison_home> SpeedEvil they are at 50 Hz
[22:19] <rjharrison_home> I love my scope :)
[22:19] <rjharrison_home> That was easy
[22:20] <rjharrison_home> 20ms
[22:20] <rjharrison_home> between peaks
[22:20] <rjharrison_home> up down spike every 10ms
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[22:25] <edmoore> rjharrison_home: how do you drive it?
[22:25] <edmoore> the voltages
[22:26] <rjharrison_home> mains :) Hence 50Hz nice one
[22:26] <rjharrison_home> I guess the smoothing isn't perfect
[22:26] <edmoore> i mean driving the input to the radiometrix
[22:27] <rjharrison_home> Part of the rectification process from ac to dc then
[22:27] <rjharrison_home> Oh 2 pins on the atmega
[22:27] <edmoore> what's on each pin?
[22:28] <rjharrison_home> Resistors!
[22:30] <rjharrison_home> http://www.robertharrison.org/images/rtty/TEK0010.JPG
[22:30] <rjharrison_home> I'll sample the Vcc tomorrow
[22:30] <rjharrison_home> I'm off to bed in a sec
[22:30] <rjharrison_home> http://www.robertharrison.org/images/rtty/TEK0010.JPG
[22:30] <rjharrison_home> Here is the spikes zoomed in
[22:30] <edmoore> ok cool
[22:31] <edmoore> odd
[22:31] <rjharrison_home> Could it be the source
[22:31] <edmoore> maybe some kind of inductance somewhere :)
[22:31] <rjharrison_home> 50hz might point to the mains
[22:31] <edmoore> does it have a height, the peak?
[22:32] <rjharrison_home> it's very sharp up and down so posibly not the power supply
[22:32] <rjharrison_home> 16mv up
[22:32] <rjharrison_home> and -16mv
[22:32] <rjharrison_home> No woories
[22:33] <rjharrison_home> Have fun all
[22:33] <rjharrison_home> nights
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[22:40] <SpeedEvil> Fun cal source - http://www.nationalgrid.com/uk/Electricity/Data/Realtime/Demand/Demand60.htm gives grid freq to 1mHz
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[23:35] <sbasuita> Runtime error on that nationalgrid :(
[23:38] <SpeedEvil> works for me
[23:38] <sbasuita> SpeedEvil, looks like they fixed it
[23:39] <russss> fwiw, there's more fun national grid data here: http://www.bmreports.com/
[23:41] <SpeedEvil> yeah
[23:41] <SpeedEvil> You only need about 20Kw-days - to be visible in that data with an appropriately psuedorandomly modulated signal.
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[00:00] --- Fri Aug 28 2009