Recent content by sammyizimmy

Here are two wav files I recorded with the hackrf and a lna I build myself. Do you think the signals are strong enough to be decoded? I have no experience in demodulation oqpsk, viterbi and reed solomon using gnuradio. Is there anyone out there that could guide me? These are 2Msp wav files...

Just in case any one is wondering, I am still working on this project. Here are some pics on dropbox of what I've got so far. I did a total redesign, sorta basing it on the BladeRF. The flow is something like this: Antenna -> rf switch -> LMS6002D -> OMAP-l138 -> PC. Due to some design errors I...

Yeah I've had some thing going on too. But I still haven't given it up. I am looking at the TMS320C6746 and ADS4222 to replace the microcontroller, fpga and adc. (Plus! Free samples of those.)

Sorry to hear that. I'm still slowly working on the pcb layout. Here are some screenshots of my work. any comments or suggestions would be welcome.

"What is it going to take to get some prototype pcb's out of this schematic?" I am working on creating footprint drawings for kiCad, then I will make a board layout. I might use https://oshpark.com/ "What kind of driver or software is going to need to be running on the host OS?" I will...

Just an update. Corrected current limiting resistor sizes for debugging leds. adjusted DC blocking cap for 1.69 GHz RF input small typos.

Ok. I'm back! Here is my "finished" schematic for my 1-2 ghz sdr. Please point out any thing missing/stupid/that won't work in my design. Here is a simple block diagram of the process. Note: The micro controller will be able to program the fpga boot flash.

Just an update of my current schematic.

I just noticed the EV schematic has 50ohm to 75ohm matching circuitry.

The max2120 has 75ohm impedance and the antenna 50ohm. Should I include a 50ohm-75ohm balun or ignore the mismatch, which would create the greatest loss?

Thank for the Max2021 evaluation kit info, one would still have to build the USB interface. I am working on a new schematic (With Ki-cad, on Linux(of course)) as soon as I get a decent scketch I'll post it.

For 1 PCB it would probably be cheaper doing it yourself although I'm not sure if we would need more than one layer(and everything will be surface mount so it will be really tiny). For more than 50 some places it's as cheap as $4-$7 a board, not a bad price. Also I think the FPGA I have in my...

I haven't found any sdrs that do what I want. The hackrf, bladerf or usrp seem a bit overkill(And expensive) for me and the prototype board on the goes website uses a lot of obsolete parts. My current design still looks like it will cost approximately $150-$200 for a one-off board. Since I am...

Dunno? Works for me. Here is the part number MAX2120CTI+

Found this, look's pretty promising. It's a lot cheaper than the ADRF2820. It has a built in LNA and VCO. http://www.digikey.com/scripts/DkSearch/dksus.dll?Detail&itemSeq=155639557&uq=635439602159738791