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| {{Project
| | #REDIRECT [[RevRadio]] |
| |Name=HAB Tracker Station
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| |Status=In progress
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| |Contact=User:Costyn_van_Dongen, Maxell, Bertrik
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| }}
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| Project page for the high altitude balloon tracking/listening station we are setting up in the space.
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| == Overview ==
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| [[File:RevSpaceHABtracker.png|500px]] | |
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| == Done ==
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| === Acquired Hardware ===
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| * "ezcap USB 2.0 DVB-T/DAB/FM" dongle, RTL2838U, Fitipower FC0013 tuner, Supported gain values (23): -9.9 -7.3 -6.5 -6.3 -6.0 -5.8 -5.4 5.8 6.1 6.3 6.5 6.7 6.8 7.0 7.1 17.9 18.1 18.2 18.4 18.6 18.8 19.1 19.7
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| * VK5QI HABamp
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| * Raspberry Pi
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| * Test payload, RFM22b sending RTTY strings on 434.250MHz. Code here: https://github.com/costyn/rfmtest/blob/master/rfmtest.pde
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| === Software ===
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| * Sending test payload --> '''works!'''
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| * Sending data from rtl_tcp on RasPi over the network --> '''works!''' (1024000 samples/second seems to go fine when both are on a wired connection)
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| * gqrx to listen to audio --> '''works!'''
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| * dl-fldigi RTTY decoding --> '''works!'''
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| * Testing VNC performance with gqrx and dl-fldigi --> '''usable with JPEG compression and 8 bits of color'''
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| '''Todo'''
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| * Setting up a virtual machine with gqrx and dl-fldigi
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| <code>
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| revspace@habraspi:~$ rtl_tcp -a 10.42.43.20
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| Found 1 device(s).
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| Found Fitipower FC0013 tuner
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| Using ezcap USB 2.0 DVB-T/DAB/FM dongle
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| </code>
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| [[File:Finaltestonpi.png|800px]]
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| == The roof ==
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| * Currently there is no lightning protection installed. We need to figure out how we are going to ground the antenna.
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| * POE seems doable, also makes it easy to restart the setup.
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| * Penetrating the roof would increase the risk of any leakage
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| ** Our best option is to guide the UTP-cable down the drainpipe, in a separate PVC-pipe.
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| == Todo ==
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| * Currently we have no antenna. Well need some heavy duty (directional?) antenna.
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| ** Do we make one or do we buy one?
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| ** What kind of antenna? (keep in mind we only have line of sight towards south/southwest) http://www.handelsondernemingveenstra.nl/webwinkel/diamond-50-p-309.html
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| ** How do we mount it? Something like this:
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| http://i.imgur.com/X3xsd.jpg with tiles in the corners to weigh it down
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| * Find and buy IP56 enclosure: http://www.conrad.nl/ce/nl/product/531547/Hammond-Electronics-Kunststof-behuizing-IP66-1554KGY-ABS-kunststof-l-x-b-x-h-160-x-90-x-90-mm-Lichtgrijs-RAL-7035/SHOP_AREA_14740&promotionareaSearchDetail=005
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| ** How do we deal with heat in the box in the summer?
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| * Obtain 48v PoE injector, make 48v-5v power regulator for inside enclosure:
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| ** http://tweakers.net/pricewatch/288179/tp-link-tl-poe150s.html (injector)
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| ** http://tweakers.net/pricewatch/280388/tp-link-poe-splitter-tl-poe10r.html (splitter)
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| * Your ideas, we love them!
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| === Lightning protection ===
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| <pre>
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| 09:53 < costyn> so guys, how do you ground your antenna's? what the consensus on lightning arrestors?
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| 09:56 < fsphil> there's so little lightning here I don't bother
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| 09:57 < costyn> hmm
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| 09:58 < costyn> we're going to place an antenna on the roof of our hackerspace, but it's not our building and we'll have to convince the
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| owners that it's safe
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| 10:18 < SpeedEvil> you need to ground to a separate rod, with a straight cable to it
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| 10:20 < SpeedEvil> thick insulated cable
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| 10:20 < costyn> define thick?
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| 10:29 < gonzo_> you are only going to be able to disipate static with earthing. very little you can do against a direct strike
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| 10:29 < griffonbot> Received email: NickB "[UKHAS] Re: DL-FLDIGI question"
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| 10:31 < gonzo_> most lightening arrestors are really just spark gap's, that allow some high voltage coming down the centre of the coax, to
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| jump to the outer.
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| 10:32 < gonzo_> your typical short colinear is possibly going to be DC short between the centre and braid anyway. (You can test with a DVM)
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| 10:34 < gonzo_> long colinears are not much of an advantage for HAB use, so I assume it will be a short one. So will not extend much above
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| the existing roof profile? So will not be any greater risk of lightening than anything else
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| 10:34 < costyn> gonzo_: it'll be a short one yea, Diamond X-50 likely
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| 10:35 < costyn> gonzo_: and it'll raise some above the roof line, but it's not a high building (2 stories) and there's higher buildings and
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| trees around
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| 10:35 < gonzo_> not siure of your mounting options, but if mounted to existing metalwork up there, like handrains etc, it will be earthed to
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| the building anyway (or at least the owners metalwork)
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| 10:35 < costyn> it's basically a flat roof with some outlets for hvac
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| 10:36 < costyn> so no existing metal work. we're thinking of using/making a stand with metal weighted down with tiles
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| 10:39 < gonzo_> then an extra ground wire would prob be worth adding. If the building or roof is metal, then that could be an option to
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| earth to, or as SpeedEvil said, an earthing rod
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| 10:44 < costyn> ok. thanks for the advice. will see what we can do. not even sure if we're going to get permission to route the coax on the
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| outside of the building, so we'll see</pre>
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