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Author Topic: ISS APRS  (Read 2465 times)
KT4NR
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Posts: 480




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« on: April 25, 2016, 10:11:18 AM »

So with a couple new rigs in the cars I programmed in a few sats into them both to just tinker with. Thanks the K6CLS for the programming ideas.

I was monitoring the ISS APRS frequency yesterday about noon local. There was a pass predicted per GoSatWatch. Just curious to see if the digi is running on the ISS as I heard zilch during a perfect high pass. Wanted to confirm I had not fat fingered something.

Thanks!
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WD9EWK
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« Reply #1 on: April 25, 2016, 10:22:36 AM »

I was monitoring the ISS APRS frequency yesterday about noon local. There was a pass predicted per GoSatWatch. Just curious to see if the digi is running on the ISS as I heard zilch during a perfect high pass. Wanted to confirm I had not fat fingered something.

The ISS digipeater has been on over the past few days, chirping away on 145.825 MHz. Have you recently updated the Keplerian elements for your program/app? The ISS was boosted into a slightly higher orbit in the past couple of weeks, which would make predictions using older sets of Keplerian elements incorrect.

Yesterday (Sunday, 24 April) morning, I worked two passes where I made at least one packet QSO through the ISS digipeater. The first pass I worked was around 1550 UTC (11.50am Eastern time, 8.50am Pacific time). I made one QSO on that pass, with AI9IN in Indiana. The next pass was around 1730 UTC (1.30pm Eastern time, 10.30am Pacific time), where I made 3 QSOs: K7TEJ here in central Arizona, KK6QMS in southern California, and W5PFG in east Texas. For all of these QSOs, I used a Kenwood TH-D72A HT and an Elk 2m/70cm log periodic antenna, using the HT's keypad to send APRS messages to these stations.

You can see a listing of recent packet activity heard through the ISS digipeater at http://ariss.net/ . This site uses gateway stations around the world, listening for the ISS digipeater on 145.825 MHz, and also plotting the locations of the stations heard through the ISS digipeater on a world map.  If you want to see a printout of what was on the http://ariss.net/ site after the second of those two passes I worked yesterday, you can get that from my Dropbox space at http://dropbox.wd9ewk.net/ - go to the folder "20160424-ISS_digipeater-DM43", and look for the PDF files in there. There are PDFs with 1735UTC and 1737UTC in the PDF file names that would have what was on http://ariss.net/ after the ISS went away from me on the second pass.

Another site that has information on ham radio activities from the ISS is http://www.issfanclub.com/ . This site reports on more than just packet activity.

Good luck, and 73!
« Last Edit: April 25, 2016, 10:40:44 AM by WD9EWK » Logged

Patrick WD9EWK/VA7EWK
http://www.wd9ewk.net/ - Twitter: @WD9EWK
KT4NR
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Posts: 480




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« Reply #2 on: April 25, 2016, 01:27:49 PM »

Ok I was listening and not transmitting just because I had no idea what I was doing. I will double check a few things and try again for another pass. All new for me.

Thanks for the explainer.
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WD9EWK
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« Reply #3 on: April 25, 2016, 02:53:50 PM »

Ok I was listening and not transmitting just because I had no idea what I was doing. I will double check a few things and try again for another pass. All new for me.

Thanks for the explainer.

No worries!

ISS packet is usually on most of the time. It will be turned off when there are spacewalks scheduled, or docking/undocking operations. This is a safety measure, to keep the 2m ham traffic from having any possibility of interfering with non-ham VHF gear used with the ISS (i.e., radios in Russian spacesuits and spacecraft). The ISS Fan Club site I mentioned earlier is a good way to know if the different ham systems on the ISS are operational or not.

Another good document explaining how to work the ISS packet system was written by JoAnne K9JKM a while back:

http://www.ariss.org/uploads/1/9/6/8/19681527/k9jkm_2012_symposium_ver2.pdf

73!

« Last Edit: April 25, 2016, 03:21:47 PM by WD9EWK » Logged

Patrick WD9EWK/VA7EWK
http://www.wd9ewk.net/ - Twitter: @WD9EWK
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