highaltitude.log.20150509

[00:49] <SpacenearUS> New position from 03SP3OSJ after 036 days silence - 12http://tracker.habhub.org/#!qm=All&q=SP3OSJ
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[02:01] <Professor> http://pastebin.com/e6cf9zjV
[02:01] <Professor> boom. got the gps to work.
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[02:03] <SP3OSJ> #habhub
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[03:57] <SP3OSJ> Hi please enter: Doc ID:93359cd67831488e2dc6fe75b21bd9ee
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[05:46] <SP3OSJ> Hi please enter: Doc ID:93359cd67831488e2dc6fe75b21bd9ee
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[07:07] <SP3OSJ> hello
[07:07] <SP3OSJ> Do you hear me?
[07:12] <x-f> morning
[07:12] <x-f> have you tried #habhub, doing it before the launch and in sensible hours of the day?
[07:12] <SpacenearUS> New vehicle on the map: 03CALLSIGN123_chase - 12http://tracker.habhub.org/#!qm=All&q=CALLSIGN123_chase
[07:16] <SP3OSJ> Hi Spacenear please enter: Doc ID:93359cd67831488e2dc6fe75b21bd9ee
[07:17] <Reb-SM3ULC> morrn
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[08:31] <Upu> morning
[08:35] <zeta> does anyone know why there is no prediction for where SP30SJ will land?
[08:37] <Upu> !track SP30SJ
[08:37] <SpacenearUS> 03Upu: Here you go - 12http://tracker.habhub.org/#!qm=All&q=SP30SJ
[08:37] <Upu> not on the map yet ?
[08:37] <Upu> oh ignore me
[08:37] <Upu> !track SP3OSJ
[08:37] <SpacenearUS> 03Upu: Here you go - 12http://tracker.habhub.org/#!qm=All&q=SP3OSJ
[08:38] <Upu> its floating
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[08:41] <zeta> thanks upu, i still can't see the landing prediction though? isn't that normally show along with the live tracking?
[08:41] <Upu> usually and if I'm being honest i'm not sure
[08:41] <Upu> but as there is no ascent or decent going on I wonder if it just doesn't bother
[08:43] <zeta> ah yes like you said its floating, so technically there is no way to know if it does not ascend to bursting point
[08:45] <craag> habmap is showing the prediction - but it seems to think it's on the descent.
[08:45] <craag> So not very useful :P
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[08:46] <craag> live float predictions are in the works I believe...
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[08:52] <zeta> i guess the rate of helium leakage can be predicted
[09:00] <x-f> it is insignificant, Leo's balloon floated around the world for four months
[09:01] <zeta> dont aviation authorities get annoyed? :)
[09:02] <craag> The main focus is predicting the path based on wind direction as a constant-pressure altitude.
[09:02] <craag> *at a
[09:31] <michemto> Hey! I have question about payload antenna...
[09:34] <Geoff-G8DHE-M> 181 Users wait with baited breath.....
[09:34] <daveake> 15 of those have the UKHAS payload antenna URL in their clipboards
[09:35] <Geoff-G8DHE-M> Ah goodpoint hangin
[09:35] <Geoff-G8DHE-M> !wiki payload aerial
[09:35] <SpacenearUS> 03Geoff-G8DHE-M: No results for your query
[09:35] <Geoff-G8DHE-M> !wiki aerial
[09:35] <SpacenearUS> 03Geoff-G8DHE-M: No results for your query
[09:35] <craag> !wiki payload antenna
[09:35] <SpacenearUS> 03craag: Wiki page 03payload_antenna (guides) - 12http://ukhas.org.uk/guides:payload_antenna
[09:35] <SpacenearUS> 03craag: Wiki page 03projects:picoatlas:picoatlasi - 12http://ukhas.org.uk/projects:picoatlas:picoatlasi?s[]=payload&amp;s[]=antenna
[09:36] <daveake> craag wins :)
[09:36] <craag> \o/
[09:36] <Geoff-G8DHE-M> \o/
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[09:42] <michemto> Yea yea yea, got that guys :D I didn't even formulate my question :D
[09:43] <daveake> 11 minutes so far; how complicated is it ?
[09:43] <michemto> Anyway, would I use one cat5 wire as a singlecore wire?
[09:44] <daveake> For the aerial itself, yes
[09:44] <daveake> But you still need coax to feed with
[09:45] <michemto> Yeah, have that pigtail part which came with pits
[09:45] <michemto> Just checking if cat5 1 wire is enough or i need something thicker
[09:45] <daveake> It's fine
[09:46] <SpacenearUS> New vehicle on the map: 03DL9UL-1_chase - 12http://tracker.habhub.org/#!qm=All&q=DL9UL-1_chase
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[09:59] <Lunar_Lander> hello
[10:07] Nick change: Herman_ -> PB0AHX-Herman
[10:09] <PB0AHX-Herman> !flights
[10:09] <SpacenearUS> 03PB0AHX-Herman: Current flights: 03SP3OSJ 437.7MHz RTTY100/470/7n2 10(d9ee)
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[13:07] <W1GIV> Hi guys, so I;m finishing up a 20m CW Balloon and now I'm thinking about antennas. What would you guys reccomend? Vertical with ground plane? dipole? cophased dipole?
[13:08] <craag> dipole is ideal if you can do it
[13:08] <craag> one leg underneath, one leg going up the string towards the balloon
[13:08] <craag> omnidirectional, efficient, resonant impedance...
[13:08] <W1GIV> Hm... that would work, although it would have to be a fraction of the wavelength
[13:09] <W1GIV> Thats a good idea
[13:09] <craag> What's your size limit?
[13:09] <W1GIV> Um, not sure. We're kinda winging this and trying it out as we go
[13:09] <craag> 20m dipole is only 2x 5m
[13:10] <craag> We often use >20m of cord on our flights
[13:10] <W1GIV> So 16ft hanging down from the bottom of the balloon and then 16ft to the balloon.....
[13:10] <W1GIV> Trying to use a smaller balloon since the transmitter is very small
[13:10] <W1GIV> The entire thing is on a piece of protoboard
[13:10] <craag> what size balloon?
[13:11] <W1GIV> We have from small party balloons to full size weather balloons
[13:11] <W1GIV> We're going to use whatever will lift everything
[13:11] <craag> Well some thin wire won't weigh too much
[13:12] <W1GIV> We are very new to this --- We've launched one full size one before with a 2m APRS transmitter but now we're trying to get smaller and less expensive launches
[13:12] <Lunar_Lander> guitar string was once named
[13:12] <craag> Lunar_Lander: Not for this
[13:12] <Lunar_Lander> ah
[13:12] <SpeedEvil> For this, thin copper would work fine.
[13:12] <W1GIV> Like magnet wire?
[13:12] <SpeedEvil> yes
[13:12] <SpeedEvil> ~0.3mm or so.
[13:12] <W1GIV> I have some 26 AWF wire on hand
[13:12] <W1GIV> AWG*
[13:13] <craag> Have 16ft of it attached the cord between balloon <-> payload
[13:13] <craag> And the other 16ft hanging underneath
[13:13] <craag> Ideal dipole :)
[13:13] <W1GIV> Here's a dumb question now (well, not dumb to me :P) both legs hooked up to the output of the crystal?
[13:13] <W1GIV> Or one on ground?
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[13:14] <craag> So you've got a 50 ohm unbalanced output right?
[13:14] <W1GIV> I have a crystal out to a low pass filter
[13:14] <W1GIV> And then out from there
[13:14] <craag> Ok, so you've got an RF pin, and a ground pin?
[13:14] <W1GIV> Yup
[13:14] <adamgreig> hopefully a 50 ohm match too :p
[13:14] <craag> Ok, so that's called unbalanced.
[13:15] <craag> As all the voltage is on one side
[13:15] <craag> for a dipole, you want to voltage on both sides equally
[13:15] <craag> ie. balanced :)
[13:15] <craag> So you need a balun
[13:15] <craag> A little 1:1 transformer on a little ferrite should do it
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[13:15] <craag> RF+Gnd on one side
[13:16] <W1GIV> Lets see.... I have a 14T core on hand
[13:16] <craag> dipole-A + dipole-B on the other
[13:16] <craag> I'm not familiar with those sizings offhand
[13:17] <craag> what's the diameter?
[13:18] <craag> 14mm :P
[13:18] <W1GIV> Oops, lol, I mean T37 - uh It's
[13:19] <W1GIV> yea 9.525mm
[13:19] <craag> How much output power are you pushing?
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[13:20] <craag> If it's less than about 3W you should be fine.
[13:20] <W1GIV> Yes
[13:20] <W1GIV> Much less
[13:21] <craag> :)
[13:21] <W1GIV> I don't know the exact --- looking at oscillator data sheet
[13:23] <W1GIV> Hm... looking at this, that power is pretty low
[13:24] <adamgreig> if you just have an oscillator going to an antenna, with no amplifier, it will probably be very low power indeed
[13:24] <W1GIV> Maybe I should look into an amp to get it up to atleast 1w
[13:24] <SpeedEvil> What 'oscillator' are you using
[13:25] <W1GIV> SG 531P
[13:25] <W1GIV> http://pdf.datasheetcatalog.com/datasheet/epson/SG-531P.pdf
[13:25] <craag> 100mW into a dipole would do well I reckon
[13:25] <craag> at altitude!
[13:25] <W1GIV> Yea, that does help
[13:25] <craag> Could do that with a simple transistor amp
[13:26] <W1GIV> My favorite thing about these balloon projects is how much you learn. I mean, so many things go wrong that need solutions. Been focused on software and GPS side of things, now that we're moving to transmitter and antenna everything changes
[13:28] <W1GIV> Yea, I think a small amplifier is needed since that power is too low
[13:34] <W1GIV> I have a couple of these http://www.onsemi.com/pub_link/Collateral/P2N2222A-D.PDF
[13:34] <craag> 2n2222 is very commonly used for this kind of thing
[13:35] <craag> on the balun front - might be worth looking to see if you have any small binocular cores kicking around - they have a far higher inductance/turn.
[13:37] <craag> I have limited practical experience with little HF stuff - but looked at the schematic for my Softrock RXTX Ensemble and it uses an output balun with a binocular core, giving 16uH for each winding.
[13:37] <W1GIV> Ok, I'll pick one up later at the store and go with a dipole antenna.... thats a great idea
[13:38] <W1GIV> Now I'll do some research online regarding the 2n2222, see what I can find.
[13:38] <craag> To get that on a T37, you need... 73 turns
[13:38] <craag> :P
[13:39] <W1GIV> yea......... no thanks
[13:39] <craag> The softrock used this little thing: http://toroids.info/BN-61-2402.php
[13:39] <craag> With 4 turns per winding
[13:42] <craag> The idea is that the reactance of the winding (2*pi*F*L), should have an insignificant effect when in parallel with the antenna impedance.
[13:42] <W1GIV> Well, now my day got busier with regards to this --- I'll have to redesign what I had in mind with regards to the transmitter
[13:42] <craag> eg.. 2*pi*(14MHz)*(16uH) = 1407 ohms
[13:44] <W1GIV> This is getting too complex for my understanding lol
[13:44] <W1GIV> Reading about these transistors and such
[13:45] <craag> One step at a time then, amp first. There's plenty of example circuits out there.
[13:47] Nick change: W1GIV -> W1GIV-AFK
[13:48] <W1GIV-AFK> lemme go hunting
[13:48] <W1GIV-AFK> for circut ideas
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[14:02] <W1GIV-AFK> I wonder how well the crystal would work without an amp
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[14:02] <W1GIV-AFK> at that altitude
[14:03] <craag> If you're happy to try it, go for it :)
[14:04] <W1GIV-AFK> I like the amp, but looking at all these circuts require a bunch of different capicators and resistors which I dont have. My local store has a limited option and waiting for shipping isn't a great option
[14:04] <craag> worst case is that you'll know it doesn't work, and can try again
[14:04] <W1GIV-AFK> Yea, next version
[14:05] <W1GIV-AFK> We've gotten everything else down to a cheap and consensed unit
[14:07] <craag> What telemetry is it sending?
[14:07] <W1GIV-AFK> CW gps data and chip data
[14:07] <craag> Cool, got any pics of the transmitter?
[14:08] <W1GIV-AFK> Not at the moment. Once I get the transmitter working again and onto a protoboard I'll send a pic
[14:09] <W1GIV-AFK> Using an 328p for the code, 555 for a nice tone, then that goes out to the oscillator then to the filter. Minus the balloon, the entire thing costs about $25
[14:10] <craag> sweet
[14:10] <W1GIV-AFK> Okay, heading out to the store.
[14:10] <craag> couldn't you generate the tone on the 328 too?
[14:12] <Geoff-G8DHE> Could the GPS or the 328p oscillator not provide the RF sinal source as well ?
[14:12] <Geoff-G8DHE> signal
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[15:45] <SpacenearUS> New vehicle on the map: 03VE6JBJ-13 - 12http://tracker.habhub.org/#!qm=All&q=VE6JBJ-13
[16:01] <alxwntr> Hiya all
[16:01] <alxwntr> I'm having an issue with my tx ISR
[16:02] <alxwntr> it all seems to work fine, but there is a problem registering the first bit
[16:02] <Laurenceb> hehe http://hackaday.com/2015/05/08/hackaday-prize-entry-an-em-drive/
[16:02] <alxwntr> which means that the string always starts with 'R$' instead of '$$'
[16:03] <craag> alxwntr: Good debugging! Is your code posted up anywhere?
[16:03] <alxwntr> :) cheers
[16:03] <alxwntr> yep - it's here
[16:03] <alxwntr> https://github.com/alxwntr/ballooon/blob/take2/ntx.cpp
[16:04] <alxwntr> or at least that's the bit with the ISR in it
[16:07] <alxwntr> Laurenceb: "If you strap a nuclear reactor to an EM drive, youÂ’ll be seeing attack ships on fire off the shoulder of Orion, and C-beams glitter in the dark near the Tanhauser Gate."
[16:07] <alxwntr> love it
[16:07] <alxwntr> :)
[16:10] <craag> alxwntr: Have you got any delay between strings? I can't work out why that would happen only on the first char of the line otherwise
[16:10] <alxwntr> yeah, it's weird
[16:11] <craag> It might be dl-fldigi not quite locking on at the start
[16:11] <alxwntr> hmm
[16:11] <alxwntr> if the line is held high when not transmitting, surely the zero start bit should kick things off
[16:12] <alxwntr> just can't see where the issue is
[16:12] <craag> yeah it should... but lol fldigi code
[16:12] <alxwntr> I guess an oscilloscope would help...
[16:12] <craag> You could add an extra $ onto the start of the string
[16:13] <craag> A lot of people send 4, so fldigi has two characters to lock on
[16:13] <craag> (back from before people started using ISRs)
[16:13] <alxwntr> sure - we considered that. I think it might end up being the easiest solution
[16:13] <alxwntr> I guess I just wondered if anyone had encountered anything like this before
[16:14] <alxwntr> great, well if thast's a standard technique that won't cause any receivers any problems, that's probably what we'll do
[16:15] <alxwntr> thanks for the help
[16:15] <craag> You'll need to discount any extra $s from the CRC
[16:15] <craag> As the crc calc only uses the last 2
[16:15] <alxwntr> oh of course! thanks for reminding me :)
[16:16] <craag> np :)
[16:17] <SpacenearUS> New vehicle on the map: 03KD4STH-8 - 12http://tracker.habhub.org/#!qm=All&q=KD4STH-8
[16:18] <SpacenearUS> New vehicle on the map: 03KD4STH-9 - 12http://tracker.habhub.org/#!qm=All&q=KD4STH-9
[16:18] <SpacenearUS> New vehicle on the map: 03KD4STH-7 - 12http://tracker.habhub.org/#!qm=All&q=KD4STH-7
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[16:26] <lahyouh> hi
[16:27] <chrisstubbs> hi lahyouh
[16:27] <lahyouh> do any one has a ready pilot sonde solution : transmitter + gps module + ... ?
[16:28] <edmoore> yes
[16:28] <edmoore> but generally it's avoided
[16:29] <edmoore> as unless someone else is putting a lot of external time pressure on you (e.g. you're a teacher wanting to do an experiment with your class), there's no good reason not to learn how to build a flight computer yourself
[16:29] <edmoore> and most people do the latter and enjoy it a lot
[16:30] <lahyouh> i don't want to buy, i want to build it myself
[16:30] <edmoore> oh cool!
[16:31] <edmoore> great
[16:31] <lahyouh> just want to have a practical view after having some theory
[16:31] <edmoore> well a guy on here (upu) has a very good shop where you can buy all the bits you need
[16:31] <edmoore> habsupplies.com
[16:31] <edmoore> he also sells off-the-shelf
[16:31] <edmoore> e.g. habduino or PiInTheSky
[16:31] <edmoore> but he sells of the individual parts. there is a *lot* of help in this channel available if you want to build your own
[16:32] <edmoore> with software, pcb design and so on
[16:32] <lahyouh> great
[16:32] <lahyouh> that's what i m looking for. support
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[16:32] <edmoore> if you want a safe option and well performing option, the ublox 8 gps units are great and work at high altitudes
[16:32] <edmoore> the mtx2 radios are also very very well proven in many flights
[16:33] <edmoore> the choice of microcontroller is up to you - if you know a particular microcontoller already then i'd just use that
[16:33] <edmoore> if you want recommendations for a micro to learn then we can help there too
[16:33] <Laurenceb> wow these guys are heavy http://royalsocietypublishing.org/data-sharing
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[16:33] <Laurenceb> not that i disagree with them
[16:34] <SpacenearUS> New vehicle on the map: 03A1 - 12http://tracker.habhub.org/#!qm=All&q=A1
[16:34] <edmoore> good Laurenceb
[16:35] <edmoore> no messing about
[16:35] <Laurenceb> yeah indeed, others should follow their example
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[16:35] <lahyouh> u are right edmoore, ublox is what i found best from my search
[16:35] <edmoore> they are well-proven
[16:35] Nick change: Randy -> Guest73418
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[16:36] <lahyouh> in fact i was looking to use one of www.dorji.com transmitters. what do you think ?
[16:36] <lahyouh> DRF4463D20
[16:38] <edmoore> i'm not familiar wiht it specifically but it looks like it's based on an si4463
[16:38] <edmoore> which i think can be persuaded to transmit our normal 434mhx rtty format
[16:38] <edmoore> Laurenceb might be able to help more with that
[16:39] <Laurenceb> yeah, personally I've done it using usart and the "direct mode"
[16:39] <Laurenceb> so 50 baud uart to one of the GPIO pins
[16:39] <Laurenceb> aiui Leo has done it using spi and lots of interrupts, which is obviously more complex to set up
[16:40] <Laurenceb> theres lots of example code from myself and others of github
[16:40] <Laurenceb> *on
[16:41] <W1GIV-AFK> Geoff-G8DHE: I can generate the tone on the 328p... good idea. As for the RF signal source? What do you mean?
[16:42] <lahyouh> ok. just to let you know that i m a newbie starting learning
[16:42] <lahyouh> so don't get all thing you said
[16:42] <lahyouh> that's why i asked for some materials
[16:43] <Laurenceb> https://github.com/tkrahn/PecanAva/blob/master/Si446x.cpp
[16:43] <W1GIV-AFK> craag: Just got back with some new goodies from the store :)
[16:45] <lahyouh> edmoore and Laurenceb : is it best to use the mtx2 radio for such solution ?
[16:45] <edmoore> maybe not 'best' but if you're new to this you might find the mtx2 easier to get up and running
[16:46] <lahyouh> edmoore and Laurenceb : could you point me some materials to start reading ?
[16:46] <Laurenceb> yeah, easier to get up and running, but heavier, less capable and cant do uplink
[16:46] <Laurenceb> the ukhas wiki?
[16:47] <edmoore> https://ukhas.org.uk/guides:linkingarduinotontx2
[16:47] <edmoore> ntx2b and mtx2b are basically the same in this context
[16:50] <lahyouh> in case of the radio sonde using the ntx2 with arduino, isn't it too heavy to be sent over the air ?
[16:50] <lahyouh> or is there any ... ?
[16:52] <edmoore> no, you can easily lift a payload of say 1kg to over 30km with weather balloons
[16:52] <edmoore> a simple arduino-based tracker and batteries and a camera might only be about 150g
[16:57] <lahyouh> ok
[17:00] <lahyouh> what are you using in the receive side ?
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[17:06] <lahyouh> hi chrisstubbs, sorry, just noticed your hi
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[17:08] <chrisstubbs> edmoore's advice looked sound (until my broadband died)
[17:09] <edmoore> lahyouh, software-defined radios are increasingly popular
[17:09] <edmoore> rtl-sdr, funcube pro, airspy
[17:10] <edmoore> traditionally ham radio receivers like the yeasu ft-817
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[17:12] <lahyouh> yeh, i know about them. but seen them a while before expensive.
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[17:13] <lahyouh> what's the cost of sradios you are using ?
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[17:18] <lahyouh> ok it makes sence. it's cheap.
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[17:41] <W1GIV-AFK> These are all so complicated. What's the simplest way to use a 2N222 as an RF amp
[17:43] <edmoore> W1GIV-AFK, you probably won't be doing any amplification at 434mhz with a 2n2222
[17:44] <edmoore> but i suppose a class a amplifier is the simplest way to use a transistor
[17:44] <adamgreig> 20m
[17:44] <edmoore> it's also the quickest way to use your batteries
[17:44] <W1GIV-AFK> ^^^ 20m
[17:44] <edmoore> oh sorry
[17:44] <edmoore> did i miss context?
[17:44] <adamgreig> 14MHz radio
[17:44] <W1GIV-AFK> A little while ago
[17:44] <W1GIV-AFK> 14Mhz Crystal --- people suggested power would be too low
[17:45] <W1GIV-AFK> I've spend some time looking
[17:45] <edmoore> apologies
[17:45] <edmoore> carry on
[17:45] <W1GIV-AFK> Everything is very complex
[17:45] <W1GIV-AFK> Well, complex for what I want
[17:45] <W1GIV-AFK> I have a simple CW 328p and Crystal Oscillator transmitter
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[17:46] <W1GIV-AFK> I have a bunch of resistors, not many capicators
[17:47] <edmoore> what kind of output power would you like W1GIV-AFK ?
[17:47] <W1GIV-AFK> Well, I was going to be happy with the 10 or so mW that the oscillator provided
[17:47] <W1GIV-AFK> But maybe 100mw?
[17:47] <W1GIV-AFK> 50mw?
[17:47] Nick change: W1GIV-AFK -> W1GIV
[17:47] <W1GIV> Anything more
[17:48] <craag> 10mW should be ok LoS - depends how far away you're wanting to track this.
[17:48] <edmoore> what kind of thing do you want to send with your transmitter - morse?
[17:48] <edmoore> rtty?
[17:49] <W1GIV> It's set up for cw
[17:49] <craag> There was a polish 20m transmitter on the balloon that managed x-atlantic with not much power
[17:49] <W1GIV> Don't have a crystal in the data range so I'm limited.
[17:49] <craag> meh who cares about bandplans ;)
[17:49] <W1GIV> Uh, part 97 is a little more required than a bandplan :)
[17:50] <edmoore> http://makerf.com/posts/mighty_simple_shortwave_transmitter
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[17:51] <craag> Which freq are you transmitting on W1GIV ?
[17:51] <W1GIV> 14.318
[17:52] <craag> Ah fair
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[17:52] <craag> But then part 97 doesn't authorise morse there?
[17:52] <craag> "Phone, image"
[17:52] <W1GIV> 97.305
[17:52] <craag> ah a)
[17:52] <W1GIV> yup :)
[17:52] <W1GIV> Not conventional but allowed
[17:53] <craag> interesting
[17:53] <W1GIV> We dont have a crystal for other frequencies so
[17:53] <craag> I wonder where ssdv comes in that...
[17:53] <craag> (images over rtty)
[17:55] <craag> Most of the bands in the UK don't have specific mode requirements
[17:55] <W1GIV> That simple transmitter one isn't bad
[17:55] <craag> Only those that are 'recommended' by the rsgb
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[17:57] <W1GIV> I'm going back in forth between amp or no amp
[17:57] <W1GIV> i dont know
[17:58] <craag> If it's 10mW without, I'd try without.
[17:58] <W1GIV> Somebody will hear it
[17:58] <W1GIV> and send it to us
[17:59] <W1GIV> I'd hope
[17:59] <craag> make sure it sends something that when typed into google brings up info on it, and how to contact you
[18:00] <craag> like the callsign :P
[18:00] <W1GIV> Our plan is: W1HLO CLUB BALLOON 5 VOLTS 22.90C 41.9382N 72.38430W 5280FT SK
[18:02] <craag> your website is timing out
[18:02] <craag> other than that, looks good!
[18:03] <W1GIV> Here's he transmitter in action
[18:03] <W1GIV> https://www.youtube.com/watch?v=JZ90iH52J1I
[18:04] <craag> :)
[18:06] <SpacenearUS> New vehicle on the map: 03WB8ELK-1 - 12http://tracker.habhub.org/#!qm=All&q=WB8ELK-1
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[19:05] <SpacenearUS> New vehicle on the map: 03DL9UL-1_chase - 12http://tracker.habhub.org/#!qm=All&q=DL9UL-1_chase
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[19:43] <Geoff-G8DHE-M> W1GIV, I mentioned creating RF from328p Oscillator, what frequency are you running the processor at ? Could it be derived from a 14MHz crystal divided by 4 say ?
[19:44] <Geoff-G8DHE-M> or could your GPS generate a signal in the HF range and be multiplied/divided to give the 14MHz signal ?
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[19:47] <SpacenearUS> New vehicle on the map: 03DL9UL-2_chase - 12http://tracker.habhub.org/#!qm=All&q=DL9UL-2_chase
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[20:29] <jet__> Hello, I was wondering if anybody would be able to advise me on a radio antenna I can use for receiving payload signals with an SDR dongle?
[20:29] <jet__> Or will the aerial supplied be sufficient as long as I place it on a car or other large metal.
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[20:33] <Geoff-G8DHE> The aerial that comes with the dongles is normally pretty useless other than for local testing!
[20:34] <Geoff-G8DHE> For home use a co-linear aerial something like an X50 is best, omni directional, reasonable gain, easy to mount, but yes it needs to go outdoors...
[20:34] <Geoff-G8DHE> Like this http://www.diamondantenna.net/x50a.html
[20:35] <Dread> new x50?
[20:36] <Dread> Geoff-G8DHE: or better x510 ;)
[20:36] <Dread> much longer and with much more gain
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[20:37] <Geoff-G8DHE> Depends what you want to spend and can you mount it easily, it varies
[20:37] <Dread> i think the person who can afford mounting x50 can also mount x510
[20:37] <Geoff-G8DHE> For Cars I use this one quite satisfactorily http://www.nevadaradio.co.uk/amateur-radio/antennas/mobile-antennas/comet-sbb2
[20:38] <Dread> i use rh770.
[20:38] <Dread> standard 5/8 for 2m
[20:38] <Geoff-G8DHE> Yup there are lots out there, the X50 is just an example
[20:38] <Dread> oh, it isn't even rh770
[20:39] <Dread> cause produced by lafayette ;D
[20:41] <Geoff-G8DHE> Might be alright for a handheld where you want a horizontal pattern but for HAB you might be better with an aerial that has best gain at about 30-45 degrees above the horizon
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[21:27] <Ian_> [15:08] <W1GIV-AFK> Using an 328p for the code, 555 for a nice tone, then that goes out to . . . That wouldn't be CW but Tone Modulated, uses more bandwidth, isn't as pokey but can be received on an AM radio.. I guess that you realised that already?
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[21:38] <SpacenearUS> New vehicle on the map: 032E0EDJ - 12http://tracker.habhub.org/#!qm=All&q=2E0EDJ
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[21:58] <SpacenearUS> New vehicle on the map: 03k_chase - 12http://tracker.habhub.org/#!qm=All&q=k_chase
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[22:10] Nick change: fl_0 -> fl_0|afk
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[22:35] <SpacenearUS> New vehicle on the map: 03KG7IXX-11 - 12http://tracker.habhub.org/#!qm=All&q=KG7IXX-11
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[23:13] <Ian_> From the GB2RS broadcast - http://rsgb.org/main/blog/news/gb2rs/headlines/2015/05/08/greek-amateur-high-altitude-balloon-launch/ 0800Z Sunday 10 May 2015
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[00:00] --- Sun May 10 2015