highaltitude.log.20090416

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[07:31] <jcoxon> morning
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[08:44] <gordonjcp> mornin
[08:44] <gordonjcp> g
[08:45] <mc-> mornings
[08:46] <mc-> have you used 6m ever?
[08:46] <gordonjcp> me? no
[08:46] <gordonjcp> I've used 4m
[08:46] <gordonjcp> apparently 6m is pretty cool
[08:47] <mc-> im trying to build a preamp
[08:47] <mc-> but dont know how to switch between tx and rx
[08:48] <mc-> are relays used at 50MHz?
[08:52] <gordonjcp> yes
[08:53] <gordonjcp> my 144MHz pre/power amp has relays
[08:53] <gordonjcp> at 50MHz you can probably get away with "ordinary" relays
[08:53] <gordonjcp> what kind of antenna are you using?
[08:53] <mc-> thats good
[08:54] <mc-> just a whip, though am
[08:54] <gordonjcp> ah
[08:54] <mc-> working on a dipole
[08:54] <gordonjcp> wouldn't bother with a preamp then
[08:56] <mc-> it can be used for rx on a balloon
[08:56] <mc-> no tx on a balloon
[08:58] <gordonjcp> if you're not transmitting then you don't need relays
[08:58] <gordonjcp> also, I suspect a preamp on a whip would mostly just increase noise floor
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[09:58] <Laurenceb> hi
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[20:25] <rjharrison> humm learning a bit about caps
[20:37] <shellevil> LEARNING ABOUT CAPS YOU SAY?
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[22:02] <Laurenceb> yello
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[22:29] <shellevil> purple
[22:37] <stilldavid> <<insert additional color here>>
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[22:57] <Laurenceb> any luck with the transceiver modules?
[22:59] <stilldavid> nope, can't get them to do anything but spit out their software rev.
[22:59] <stilldavid> Laurenceb: where are you located?
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[23:00] <Laurenceb> UK
[23:00] <Laurenceb> midlands
[23:00] <stilldavid> was going to offer, if you want to pay shipping... I'm pretty fed up with them and don't have time/energy to mess with them anymore
[23:01] <stilldavid> I'm in california, though
[23:01] <Laurenceb> its fine thanks
[23:02] <Laurenceb> I need to put in an order with sparkfun soon anyway
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[23:08] <stilldavid> well, back on the shelf they go. maybe I'll strip the radios out after all
[23:08] <rcaron> stilldavid: what transceivers are these?
[23:08] <stilldavid> a pair of these: http://www.sparkfun.com/commerce/product_info.php?products_id=155
[23:09] <stilldavid> I feel quite dumb, but I can't for the life of me get them to work, even after pouring over each data sheet as well as multiple threads in the SFE forum
[23:11] <rcaron> strange, they look straightforward enough, they had caught my eye previously
[23:12] <stilldavid> that's why I got them, they look easy to use! might have to find a working oscope and have another go at 'em
[23:14] <rcaron> I'm in LA and have an oscope; should be an easy thing to diagnose
[23:15] <rcaron> at least whether its the radio or the microproc that's toast
[23:16] <stilldavid> well, the uP prints the version number on boot/reset, so I'm quite sure it's still working
[23:16] <stilldavid> but I can't get them to talk to each other. one is at TTL on com1, the other RS232 on com2.
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[23:24] <rcaron> yeah, pretty much any kind of debugging requires an oscope
[23:29] <Laurenceb> theres always soundcards
[23:29] <Laurenceb> or your ears
[23:30] <rcaron> what's the sampling frequency of your ears?
[23:30] <Laurenceb> it doesnt really work like that
[23:30] <rcaron> :P
[23:31] <Laurenceb> lots of descreet filters and logorythmic amplitude detectors
[23:31] <Laurenceb> also the filter bandwidth increases logarythmically with frequency
[23:31] <Laurenceb> so you hear pink noise as being "white"
[23:31] <Laurenceb> up to ~20KHz
[23:32] <Laurenceb> my hearing used to go up to ~25KHz ... not sure these days
[23:35] <Laurenceb> also its "compressed" - hence why MP3 works
[23:35] <Laurenceb> it attempts to emulate the compression so you dont notice it
[23:57] <SpeedEvil> and psychoacoustical masking
[23:57] <SpeedEvil> you can't forex hear a 1.01KHz tone 40dB under a 1KHz tone
[23:58] <SpeedEvil> so you can delete the 1.01KHz tone without audible effect
[00:00] --- Fri Apr 17 2009