highaltitude.log.20220323

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[05:59] <SpacenearUS> New position from 03PE2BZ-4FSK after 0313 hours silence - 12https://tracker.habhub.org/#!qm=All&q=PE2BZ-4FSK
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[06:28] <SpacenearUS> New position from 03SA6BSS-8 after 03a day silence - 12https://tracker.habhub.org/#!qm=All&q=SA6BSS-8
[07:59] <SpacenearUS> New position from 03NOB11 after 0315 hours silence - 12https://tracker.habhub.org/#!qm=All&q=NOB11
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[08:02] <SpacenearUS> New position from 03SP6HD-4FSK after 03a day silence - 12https://tracker.habhub.org/#!qm=All&q=SP6HD-4FSK
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[08:12] <SpacenearUS> New position from 03BSS43 after 0317 hours silence - 12https://tracker.habhub.org/#!qm=All&q=BSS43
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[09:01] <SpacenearUS> New position from 03VORTEX1 after 038 days silence - 12https://tracker.habhub.org/#!qm=All&q=VORTEX1
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[09:44] <SpacenearUS> New position from 03SA6BSS-7 after 03a day silence - 12https://tracker.habhub.org/#!qm=All&q=SA6BSS-7
[10:05] <SpacenearUS> New position from 03KD2FOU-11 after 0313 hours silence - 12https://tracker.habhub.org/#!qm=All&q=KD2FOU-11
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[13:02] <SpacenearUS> New position from 03NOB12 after 0312 hours silence - 12https://tracker.habhub.org/#!qm=All&q=NOB12
[13:48] <SpacenearUS> New vehicle on the map: 03DK2MT - 12https://tracker.habhub.org/#!qm=All&q=DK2MT
[14:36] <SpacenearUS> New position from 03GSN-TS-4FSK after 0315 hours silence - 12https://tracker.habhub.org/#!qm=All&q=GSN-TS-4FSK
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[15:53] <SpacenearUS> New vehicle on the map: 03SSTAR0476 - 12https://tracker.habhub.org/#!qm=All&q=SSTAR0476
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[19:56] <SpacenearUS> New vehicle on the map: 03KC1EAI-11 - 12https://tracker.habhub.org/#!qm=All&q=KC1EAI-11
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[21:06] <Guest67> Hey, can anyone answer a few questions I have about launching my first HAB?
[21:07] <daveake> Go ahead
[21:08] <SpacenearUS> New position from 034FSKTEST after 034 days silence - 12https://tracker.habhub.org/#!qm=All&q=4FSKTEST
[21:09] <Guest67> How on earth do I get the data down from the baloon, most the data on the UKHAS site is quite old. I've got my head around the recieving, but what do I need on the baloon.
[21:10] <Guest67> My main aim is getting pos data, all the other sensor data can wait until recovery
[21:11] <daveake> Which country will you launch from ?
[21:11] <Guest67> UK
[21:11] <daveake> Cool. OK so here we can only use low poer license-free radio transmitters in the "ISM" bands
[21:12] <daveake> which pretty much means around 434MHz, 10mW max
[21:12] <daveake> You have a choice of modulation i.e. how the data is encoded in the radio signal
[21:12] <daveake> Which mostly boils down to RTTY or LoRa
[21:13] <Guest67> any perticuluar advantages, or just as you please
[21:13] <daveake> Are you going to build and/pr program the tracker yourself?
[21:13] <Guest67> I'm happy to, but if a pre-packaged solution is a better option I'm open to it
[21:14] <daveake> Depends what you mean by "better" :)
[21:14] <daveake> It's cheaper and more educational to DIY
[21:14] <Guest67> go with the DIY :)
[21:14] <daveake> And I say that as someone who sells (indirectly) balloon trackers
[21:15] <daveake> You learn more plus you get the satisfaction of having your code running in the stratosphere
[21:15] <Guest67> very true
[21:16] <daveake> SoRTTY - with this you write some code to waggle a pin that controls the frequency of the radio transmiiter
[21:16] <daveake> Essentially you set the pin high or low to send a 1 or 0 over the radio
[21:16] <Guest67> right, makes sence
[21:17] <daveake> This has to be for a fairly tightly controlled time of the order of milliseconds so you'd use a timer interrupt for that
[21:17] <daveake> Also you need to send start and stop bits around the data bits
[21:18] <daveake> That way the receiver knows where each byte starts
[21:18] <daveake> Essentially this is like an olde RS232 serial port, but over the radio
[21:18] <Guest67> what level of microcontroller would you need for that, simple arduino or something a bit bigger like an RPI
[21:19] <daveake> Either, but on the Pi you'd use a real serial port as the timing is tricky
[21:19] <daveake> If you just want to send telemetry, then almost any microcontroller will do it.
[21:19] <daveake> Arduino, ESP32, whatever
[21:20] <Guest67> great, i'll stick to an esp
[21:20] <daveake> A Pi makes it easy to send image data too, but then you've got a larger device, larger batteries, operating system, more complexity
[21:20] <Guest67> Image data I'm fine getting after the landing
[21:20] <daveake> Plus waiting for the thing to boot after power up
[21:21] <daveake> Great
[21:21] <daveake> Have a look at https://ukhas.org.uk/guides:linkingarduinotontx2
[21:21] <daveake> The NTX2 is old but there are later models that do the same thing but better
[21:21] <Guest67> Thanks
[21:21] <daveake> And if you get stuck I have some NTX2s spare
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[21:23] <daveake> On the receiver side, unless you happen to be a radio ham with UHF kit, then an SDR (software defined radio) connects to a PC over USB, so you can receive with that using suitable PC software
[21:23] <daveake> Or a Mac
[21:23] <Guest27> Yeah, I've grasped (just about) the concept of SDR
[21:23] <Guest27> (I'm the same person as before just on my phone)
[21:24] <daveake> Just be aware that the cheap RTL SDRs are a bit on the deaf side so you might want to invest in a better one, or a pre-amp
[21:24] <Guest27> Got it
[21:24] <daveake> For general HAB advice have a read of http://www.daveakerman.com/?p=1732
[21:25] <daveake> For receiving/decoding RTTY see https://ukhas.org.uk/guides:sdr_tracker
[21:25] <daveake> On the tracker you'll need the ESP, a UBlox GPS, and the NTXB /NTX2B / MTX2
[21:26] <Guest27> Great! Thank you very much for all your hel0
[21:26] <daveake> Plus battery power supply - use primary lithium cells (Energizxer Lithiums) as they work when cold
[21:26] <daveake> np
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[22:40] <SpacenearUS> New position from 03NOB9 after 0315 hours silence - 12https://tracker.habhub.org/#!qm=All&q=NOB9
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[23:54] <SpacenearUS> New position from 03DG4NOB-7 after 033 days silence - 12https://tracker.habhub.org/#!qm=All&q=DG4NOB-7
[00:00] --- Thu Mar 24 2022