cariboulite
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cariboulabs
HF Support
Hey @batica81 Thanks for you message. I will have an answer once I test the boards for these frequencies. I'm not very optimistic on the performance levels at those frequencies though, and that is why I exclude them from the official bands.
This doesn't need to be HF for HAMs to love it. (W5TSU). Nor is TX needed. I run Several Internet SDR receivers. W5TSU.net.
I'd love to get this integrated into the OpenWebRX project.
I'm unsure of the receive bandwidth. You said the "Analog Bandwith" is <4MHz. This is TX bandwith?
And the "Sample Rate" of the AD is 4MSPS. What is the IO bandwith to the PI? IS PIO speeds?
Hello @mgrennan, thanks for the message. The analog receive bandwidth is selectable while the maximal possible analog RX bandwidth is 4 MHz as for the I/Q receiver with 4 MSPS sampling rate. The IO digital bandwidth of the Pi is currently tested to be > 200 mbits/sec using the SMI interface. I'm currently working on pushing it towards >250 mbits/sec. The SMI interface is actually a great thing that is very poorly documented. I'm going to investigate it not only for this project but also for the following other projects in the community. The OpenWebRX is a great idea for the project to be integrated in. The RPI computer can be a dual receiver node in a larger network that broadcasts information over the internet. Which is my goal. Do you know whether that is a plan to integrate TX in the OpenWebRX?
David
David, We are "In Tune" I'm hoping to create a receiver registry with API. Beside lookup receivers, receiver could register their location, high / low freq, bandwith, protocol, (RTL, Raw IQ...). Receivers (OpenWebRX) would read the API for a menu of receivers.
I promoted the TDoA project for example (https://www.rtl-sdr.com/kiwisdr-tdoa-direction-finding-now-freely-available-for-public-use/). I see a day with a receiver grid where you could watch / lission to anything you want anywhere in the world. Millions of "Local" receivers you tune into with a WebApp.
I'm only interested in this project for both RX and TX support in ISM bands I want to test different modulation techniques and their effects, so I need TX support. If you just want to put tuners across the globe, they are many cheap and available SDR's already on the market..
Will, there are kind of cheap SDR but few in this spectrum. HackRF for example. I'm interested... So what part of ISM bands is broad. What modulation techniques?
well, although I think I'm getting off-topic, I will take the opportunity to present a use case. For the record, I'm very inexperienced in radio, but work FPGA/Firmware professionally. I have done the SDR-dongle thing and know a bit about I/Q. For my hobby of flying quadcopters, basically called "FPV", we use 900 Mhz, 2.4 Ghz and 5.8 Ghz. Some new tech came out for ELRS (https://github.com/ExpressLRS/ExpressLRS). I want to analyze/capture signals used for RC Links. I also want to play with trying different modulations and do a QAM based signal. And I'm very anxiously awaiting crowdfunding on this.
Wow again. Beside being a HAM I'm also the president of the local RC Club (torks.org) and a contributor to Ardu-Copter code. I also follow the OpenTX and MultiProtocol projects. I didn't know anything about ExpressLRS. Reading now. If you'd like to continue this thread email me at w5tsu @ grennan.com
Hi guys, I tested a few days ago the performance down to 1 MHz and it seems to have a pretty decent performance also in the range of 1-30 MHz. Of course, it's way out of spec, but I didn't see a very catastrophic attenuation/distortion.
Cool, great to hear! So please don't block HF in firmware, although out of spec, or make it easy to enable for experimenters :)
maybe this where a good qo100 rx/tx station, do the cheaper version cover the 2,4ghz tx range of the qo100?
