search

markjfine / nrsc5-dui

An enhanced, user-friendly version of nrsc5-gui that is not heavily dependent upon Python processing for audio generation.
GNU General Public License v3.0
139 stars 9 forks source link

Analog (analogue) Radio Implmentation [Long Term Goal] #8

Open andrewfer000 opened 3 years ago

andrewfer000 commented 3 years ago

Starting this issue in case someone starts working or wants to start working on implementing the following features and want's a good place to document problems and progress. This is somewhat extended from the original goal but not by much.

I think building it off of something like rtl_fm might be a good starting point. Since Nrsc5-DUI is just a frontend, it's better to have a way to do the demodulation and audio processing outside of the python program.

markjfine commented 3 years ago

I'd also like to add DRM support as a counterpoint to ibiquity HD Radio at some point. Mostly for shortwave.

Edit: Also added decoding of trunked transmissions to the TODO as another nice to have. Might be out of my league on that one though.

Edit2: Might get to a point where this really becomes much bigger than just nrsc5 and would have to merge this into a different, bigger project. Maybe build smaller, similar pieces, then integrate them one-by-one.

andrewfer000 commented 3 years ago

That's what i was thinking. Build or find smaller projects to get things to work and then integrate them into nrsc5-dui. Honestly, I think if we can just find projects similar to nrsc-5 but for am/fm and use Sox to get the information and control the software then it would be easier.

markjfine commented 3 years ago

One of the guys responding said something about AM use. Clearly must be in DC because that's the only HD Radio AM station available 820 WWFD). I should tell him/her it's also a stream on both WTOP FM HDR stations (103.5 and 107.7). WWFD doesn't have the oomph to get down to where I am in Virginia, even with a longwire, but WTOP comes in just fine.

markjfine commented 3 years ago

Correction. Just read that 1230 WFAS in White Plains, NY just applied to go all-digital. Hopefully that's not squashed by 1210 by you and you might have an opportunity to bag an HDR AM station using the app someday.

markjfine commented 3 years ago

Check that... it's a 1kw daytimer. Good luck with that.

andrewfer000 commented 3 years ago

When I get home I'll check that. 1210 AM is pretty popular here in the Philly-Camden area so I doubt they'll be going all-digital any time soon. I can usually tune into them in my car or if I'm by a window using my RTL-SDR Blog v3 with direct sampling and the right antenna. I was never able to use nrsc5 to lock on to the HD signal (if it even has one still, it's still listed on hdradio.com though) Also, I don't know if my SDR can even pick it up, on my waterfall (CubicSDR) I do not see the digital side-bands like on FM.

andrewfer000 commented 3 years ago

Also I have been looking into possible easy tools to get FM Radio working on this program. I'm thinking rtl_fm might be our best bet. I don't know if that provides everything necessary in the way nrsc5 does but I could be a way to get FM (for broadcasts) and NFM (for NOAA). I'm not sure if you can decode RDS from the signal if it comes from rtl_fm though. This one will take some time and I wish we could get someone like the sdr-j-fm dev on-board to help with this (I know he's active since he implemented a fix for me in a day) and I think it might be our best option.

-Edits to fix grammar and spelling-

markjfine commented 3 years ago

Didn't mean to imply 1210 was digital, just that it might interfere with picking up 1230 from White Plains. All-digital AM stations don't have sidebands that straddle a main AM carrier like on FM. It's just one big digital chunk about the carrier freq. A normal AM radio just thinks it's noise and blows right by it.