Ham Radio - Decoding packet radio with GQRX 

Hi Kevin! The "garbage" is encoded coordinates that give more detailed GPS locations. Just dropped in to say hi. 73, KEØOG

the weather like in you can also make it into a vertical slot and that will give you horizontal polarization,

Thanks for the heads up Kevin, amazing what's right under your nose at times..

Really enjoyed the video, I think I'll be having a look at that SDR software program to use with my RTL-SDR usb unit. I've came across the same issue with someone accidentally coming through a 70cm repeater. I used my handheld, Mobilink unit with my Android phone and logged all the data and check who it was. I found out that the person was flying a private plane and had accidentally switched his handheld on some how, I found out this after he replied to an email I sent him, he was amazed I logged the packet info, the packet transmissions were going through the repeater for the best part of 1hr till he was out of range. Cheers, Adam VK2YK

I can't believe I didn't know about this, thank you Kevin!

Packet modem is still in use and Email over Radio or Internet thru the Wínlink Express via VHF/UHF or shortwave

Not a bad to know and yes a nice yogi could help and it would be fun. Thank you for sharing.

1:20 in the video "Automatic Position Reporting System". I'm still trying to retrain my brain to refer to APRS by it's proper name - Automatic Packet Reporting System. Most people use APRS for position reporting, but it can send any information in the packet. Thanks for letting us know about gqrx decoding packet radio. That was news to me, and very welcome news. I wish gqrx had a built-in POCSAG decoder, although your previous video on that is easy enough to follow with a little bit of command line effort.

Maybe a future video on an explanation of the whole coded msg. What each character or set of symbols mean. I'm not doing packet, but if I was going to use the embedded sub program I'd like to know what it all meant. Keep them coming. Always enjoy your videos, and even occasionally, accidently, learn something.

There’s also a demodulator in SDRAngel that does this.

This Software works good with a SDR Play RSP DX,

Hope ur feeling well

Packet Radio networks still exists in some areas around the U.S. , many of them are relegated to Ecomm.

Take a look at YAAC also. Works great on Linux as well. Under active development for APRS. I'd put the URL but those usually get tossed on RU-vid comments.

Hi Kevin, thanks for another interesting video. I think the gobbledegook might be MIC-E data (per www.aprs.org/aprs12.html) perhaps. Cheers Julian GM7MTK

Tune to 145.825 FM to pick up satellite APRS.

Must be in the zeitgeist or something, about a week ago I was playing with my SDR and decided I wanted to decode the APRS packets flying around... Gqrx didn't actually work for me, but I may have been having antenna problems at the time.

what else does the AFSK1200 decoder tool work with? The only examples I see are for APRS. Are there other types of messages you can capture like this?

Thanks for that tip. I was reluctant to using that feature as the crash was annoying. I heard its fixed in the latest, but not in the repos yet. Although Im confused, they claim v. 2.11.5 out on 2018 May 17, gqrx.dk/category/news fixed the issue, but not mine. v.2.12.1-2 as per Manjaro linux. Anyway, One trick that i find supper handy is the ability to move the little windows in the app. Just grab the top handle and slide them around next to each other so there all open. No more switching from tab to tab. :)

What about turning a pictures into Base64 and sending that so they can decode it back into Base64 and them back to the picture, that bug that you found needs to be rooted out of the package pronto.

Please confirm how to setup Gqrx for the AFSK1200 to work.

I am using a Realtek RTL2838UHIDIR with a NooElec upconverter. I have it connected to a 168' long wire antenna. I'm using gqrx. I cannot figure out how to configure gqrx to use the upconverter to listen to HF. I can't hear anything on HF at all, ever. This is so discouraging. Can you please explain to me how to set up gqrx so I can hear something on hf? All I ever wanted to do it download a weather fax.

Try direwolf

Greetings and Hello from the Fort. GQRX looks very interesting and googled it, but found designed for Linux. I don't have Linux on my machine but do have Windows. Looking for a W indows version but seems to be hiding from me. Is there a windows version? KG9FM

How do you know what modulation to use?

A.- O.K.

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