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satellite ops
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Gil Smith
Hi Clint: I see. ?Well, if the iss or sat path prediction cannot be made too accurately for weeks or months ahead, that precludes an autonomous remote system from periodically tracking a pass to send an aprs update. ? Is there a chance of hitting it with a non-directional antenna (knowing at least the approximate time windows when the bird is in view)? ?Things like the SPOT seem to work just fine with a little patch antenna (much higher freq I presume, and likely more than one of their sats in view). ?Can 2m aprs possibly hit the sat with a vertical? ?Horiz dipole? ?Circ-polarized ant matching the polarity of the sat? ?TX power level needed? Any thoughts appreciated. ?thx, ?gil
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When the ISS passes over me - and I am NOT set up for APRS - I can hear its bursts quite well with a Smiley 270A or other 17" whip on an HT. Well enough to actually use APRS? Darned near ...
OK - with that said - many use verticals that have been "tilted" 20 degrees or so to work FM birds. Not the best setup, but it certainly could work. Excuse me for asking - but what would be the purpose of sending packet/station info through ?the ISS from an unattended station? (Possible "naive mode ON" on my end ... the excitement for me for APRS and the ISS is actually being there to see it all occur ... (grin).) Clint |
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Gil Smith
Well, aprs proved to be darned handy for my balloon flights. ?Used a byonics freq-agile transmitter to tx both on .390 and a quiet channel. ?I want to try something remote like an solar-powered weather station or a boat at sea. ?Out in the middle of nowhere where digis can't hear, I could tx on a sat freq if I can hit it. ?If I can't track at the remote site, and just use a fixed antenna, I would at least need to program the days/times of view to tx a packet or two when the sat is overhead. ?Even getting one packet through every day or two would be useful. I would have a home station (hand-held at first, then maybe motor-driven) to receive and decode the aprs data from the iss/sat. ?Actually anybody could receive and decode it. ?I just take the audio out of the HT, split it to run to headphones and the audio-input of a laptop, and run the soundcard modem by UZ7HO. Just want to try something different and interesting. gil |
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Bill Boyer
开云体育I am about 80% done on one for a balloon project using an Arduino Uno, an Argent Data Radio Shield and a $28 2-watt Chinese HT. Should be good for 12-15 hours using an 1,100 mAh LiPO battery for the Arduino power.? ?? ? ? ? This message was delivered by flying monkeys!On May 26, 2014, at 11:45, "'Gil Smith' gil@... [FT-60]" <FT-60@...> wrote:
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gil
开云体育Hey Bill Boyer: I'd like to hear more about your balloon stuff. ?I had not seen the argent shield before -- how do you like it? ?My first balloon started with an arduino micro (lightweight uno), but after loading the libraries for the SD card logging and the adafruit gps lib, I had very little flash space for other stuff, so I put a mega in there. ?Then I lost the mega in the great LE-2 disaster when I lost the payload and slapped myself for not having a second independent tracker/gps/bat. ?I got another mega and found a circuit board short under the chip. ?Swapped it, flew again, and then used a payload based on a pic design. ?I am currently laying out a new pcb specifically for hab use, which will take either my pic design or an ard mega.? Keep me posted on your balloon project. Thx, ?gil |
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Bill Boyer
开云体育Haven't flown it yet, but the radio shield handles the ax-25 to serial (and back) translation, as well as driving a 2-line LCD if you need it. For an APRS beacon, the Arduino only has to read from the GPS and send certain packets to the radio shield. To receive APRS it has to get data from the shield and process it.? ?? ? ? ? This message was delivered by flying monkeys!On May 29, 2014, at 20:22, "gil gil@... [FT-60]" <FT-60@...> wrote:
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