GNU radio is very powerful and easy to use. In 15 minutes you can create a radio by visually arranging some blocks, even without knowing too much about DSP. I'm surprised it hadn't got more traction within amateur radio community. Pretty much all types of radio have been simulated at this point using it.
There's also another upcomming candidate for this role: Scratch Radio https://github.com/myriadrf/ScratchRadio It looks like a really nice toolkit for beginners and I want to try it sometimes. Unlike GNU radio, it has scripts written in Lua instead of Python. That's a downside for me as I find Python much easier. Oh, btw, I'm pretty sure GNU radio has a quadrature modulator, but I think it's called a frequency modulator. On 1/31/18, Steve <[email protected]> wrote: > GNU Radio is one of those love it and hate it applications. I like how I > can plug in my Pluto learning module and transmit and receive waveforms. Or > my old RTL dongle. It's just amazing. > > What I wanted actually is a Quadrature modulator. There's a Quadrature > demodulator, so why not the opposite? No problem, I'm sure someone in the > last 10 years has some code to implement one. Well a google search found > none, but I got side tracked and bought 25 picks and a new strap for my > guitar... > > So I coded up a 3200 codec with the default OFDM modulator, and looked at > it using the RTL dongle and gqrx. Here's a link to the waveforms: > > Waveform Examples <https://goo.gl/izAZmV> > > My 3200 codec is transmitting 1.56 MHz wide. Golly! (433.190 to 434.750). > This is no good. It's a worthless GNU Radio option. I only want to transmit > one sideband. > > I read in David's blog where he's not a big fan of IQ Modulators, and I > guess no one else is either. "but I persisted". I happened across the > LTC5599 chip. It's $10 in single quantities, so I guess they aren't selling > a lot of them. It's neat though how you can program its registers and get > the waveform optimized. A little bit more filtering, a 12 watt brick, and > you're ready to go with 1.25 Khz spaced voice channels on VHF. > > 73 > ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Freetel-codec2 mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/freetel-codec2
