[Balint Seeber] just sent in a small yet timely project he’s been working on: a software radio. Now with a cheap USB TV tuner card, you can jump right into the world of software-defined radio. [Balint]’s code comes just a week after and posted stories about using a $20 USB TV capture dongle for software defined radio. At the time, these capture cards could only write data directly to a file. With [Balint]’s work, anyone can use a cheap tv tuner dongle with,,. If you’ve ever thought about trying out software-defined radio, now might be the time.
Geniatech, Analog Stick Manufacturer, supply U720 USB TV Tuner, a new mini size Analog USB TV Stick using the last to minute technology. You can watch.
Elsewhere on the Internet, a surprisingly active dedicated to using the Realtek RTL2832U tuner for software defined radio. There’s an listing compatible USB dongles. The cheapest (so far, and subject to change) is the Unikoo UK001T available for $11 on eBay. With his source block, [Balint] can listen to anything on the radio between 64-1700 MHz. The sample depth is 8 bits and the sample rate can be anything up to 3.2 MHz. You can watch [Balint] testing out his $20 GNU Radio rig after the break.
• • • • Posted in Tagged,,, Post navigation. @Aud1073cH: I’m no expert, but it seems this device can sample up to ~3MHz. Which if I understand correctly means you can pick a single centre frequency between 64-1700MHz and see 1.5MHz either side of it at the same time.
I think the USRP has something like 100MHz bandwidth, but if you wanted to see the entire spectrum at the same time you’d need 1.7GHz bandwidth. That amount of bandwidth would generate many gigabytes of data per second, so you’d need something like Thunderbolt or 10 gigabit Ethernet to get the data into a PC for processing, and it likely wouldn’t be possible to do it in real time.
That post last week, and especially this post have changed my mind on how to do a project I have planned for later this year. (I don’t have time right now). I’m thinking this might be a good reciever to cover a decent portion of a ham band simultaneously, with software picking out different FM and GMSK signals in a band. Might even be able to have it monitor both the input and output frequencies for a repeater to automatically have it tell you if you are in simplex range of another station Much work to do when I am done with 6.002x. Transmitters and receivers are very different, though they have some elements in common.
You can’t make one out of the other. You can get radio transmitters of all different types, including a few cheap kits for broadcasting FM with a few watts. They’re usually illegal to use, and their signal output quality is pretty bad.
You can spend a few dollars on that, up to thousands for proper professional transmitters. If you just want to send audio, there are a number of radios that use public allocated frequencies, like walkie-talkies but longer range. Tkp 45 201 111 2008 02250 country. I just ordered one to checkout. I suspect I’ll be disappointed with the performance, compared to a simple ‘ol analog xcvr. My take is, the 8 bit ADC will establish a dynamic range of a mere 48dB.
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