On 02/23/2017 03:37 PM, Marc Pàmies Massip wrote: > Hi Chuck, > > What I want to do is to scan a whole GSM band (let's say GSM-900) tuning > the device at a different frequency at each step. With my computer I > have no problem to work at the highest recommended sample rate (20 MHz), > but I wanted to know if the same could be done with a combination of > Raspberry/HackRF or Raspberry/RTL-SDR. > > Your think I could do it using the cheaper solution that you suggested?
Yes, for all the bands below 1.2 GHz, use a decent RTL dongle https://www.nooelec.com/store/nesdr-smart-sdr.html which is stable at a sampling rate of 3.2 MHz and an error on order with a HackRF. For bands above 1.2 GHz - DCS or PCS - you'll need a HackRF - which should work on the rpi since the channels are 200 kHz wide. I've run the HackRF at a sampling rate of 1.75 MHz on BeagleBone Black. So the HackRF should work on a rpi if has a FDI USB chipset. Buy a decent logperiodic antenna http://www.ebay.com/itm/Cellular-Log-Periodic-Yagi-Antenna-CANT-0041-LTE-Verizon-AT-T-Wilson-Zboost-Ncon-/381271094632?hash=item58c5873568:g:VLUAAOxy0zhTMhWZ The RTL dongle has a FEMALE SMA female connector - as does the HackRF. The antenna has a FEMALE N-TYPE connector. Ao you'll need a MALE N-TYPE to MALE SMA cable http://www.ebay.com/itm/LMR240-UF-ULTRA-FLEX-SMA-MALE-N-MALE-Coaxial-RF-Pigtail-Cable-USA-/141788900952?var=&hash=item66a75640d5 choose your length. I'd recommend 10 feet - get the antenna away from your compter and SDR - and it allows you Build a simple small stand out of PVC 3/4 inch pipe. A long cable allows you move it around. It also gets the antenna away from compter and SDR. Then download kalibrate-rtl, and kalibrate-hackrf. They will allow you to scan to calibrate your RTL dongle and HackRF and scan the GSM bands. And last but not least, subscribe to gr-...@googlegroups.com > > Thanks a lot for your answer, > > Marc. >> >> On 23/02/2017 20:33:40, Chuck McManis <chuck.mcma...@gmail.com> wrote: >> >> I don't think this question, as asked, can be answered. Is the HackRF >> and Raspberry Pi signal compatble? Yes they are. Can you plug a HackRF >> into the Raspberry Pi and have it recoginize it and talk to it? Yes >> you can. Can you do all the things that people do with HackRFs when >> using a Raspberry Pi, no you cannot. >> >> You can start that question from the other side though, like "I do >> with my HackRF and my current machine, can I swap in a Pi and still do >> that?" (probably the answer is "no" unless you are just tuning in FM >> radio stations). >> >> So here is my recommendation, you will not be able to do anything >> other than tune a wider range of frequencies with a HackRF/Pi >> combination than you would with a RTL Dongle/Raspberry Pi. The latter >> is about $80 total cost US, the former nearly $500. If you want to >> tune ranges outside the RTL dongle's tunable range then build an RF >> mixer so that you can use to upconvert (or downconvert) signals >> outside of the RTL dongle's range into a frequency it can tune to. >> Even a mixer/RTL/Pi combo is going to be cheaper than the HackRF. >> >> On Thu, Feb 23, 2017 at 11:05 AM, Marc Pàmies Massip >> wrote: >> > Hello, >> > >> > I wanted to ask if it is feasible to use a HackRF with a Raspberry >> Pi. I >> > have seen that some people use both hardware together, but it sounds >> strange >> > to me considering that the minimum sample rate recommended for the >> HackRF is >> > 8 MHz. A Raspberry Pi can support such a high sample rate? Are there >> any >> > other drawbacks to consider if this combination was to be done? >> > >> > Thank you in advance. >> > >> > _______________________________________________ >> > HackRF-dev mailing list >> > HackRF-dev@greatscottgadgets.com >> > https://pairlist9.pair.net/mailman/listinfo/hackrf-dev >> > > > > _______________________________________________ > HackRF-dev mailing list > HackRF-dev@greatscottgadgets.com > https://pairlist9.pair.net/mailman/listinfo/hackrf-dev > _______________________________________________ HackRF-dev mailing list HackRF-dev@greatscottgadgets.com https://pairlist9.pair.net/mailman/listinfo/hackrf-dev
