soup4you2 Posted October 20, 2014 Share Posted October 20, 2014 I'm just curious if it's at all possible to make a GSM repeater with a hackrf one board. Quote Link to comment Share on other sites More sharing options...
barry99705 Posted October 20, 2014 Share Posted October 20, 2014 No. It's not a duplex radio. Quote Link to comment Share on other sites More sharing options...
soup4you2 Posted October 20, 2014 Author Share Posted October 20, 2014 Thanks, so in theory if i also had a cheap RTL-SDR reciver it would be possible? Quote Link to comment Share on other sites More sharing options...
barry99705 Posted October 20, 2014 Share Posted October 20, 2014 Thanks, so in theory if i also had a cheap RTL-SDR reciver it would be possible? With the right software, sure. Quote Link to comment Share on other sites More sharing options...
no42 Posted March 11, 2015 Share Posted March 11, 2015 (edited) You have 2 options: 1) Use 2x HackRFs (1x receiver, 1x transmitter) - due to the 1/2 duplex nature 2) Use a bladeRF - as its full-duplex Edited March 11, 2015 by midnitesnake Quote Link to comment Share on other sites More sharing options...
KD6W Posted April 18, 2015 Share Posted April 18, 2015 I can think of another option but not with an analog GSM radio. Use a single HackRF1 and set it to time division multiplex once a carrier is detected (46 mS receive or transmit and 4 mS idle) on a single frequency to sync with another HackRF1 on the opposite cycle. It's like having two, two stroke engines exactly operating exactly 180 degrees out of phase. The antenna ports (RX/TX) can either have their own antenna but will have better performance with a circulator in between them to feed a single antenna. DMR radios do a form of this today, albiet on two different frequencies to offer two voice paths. But a simplex DMR repeater sits in the receive mode and will sync with the first carrier to come up when an operator accesses it. The repeater starts cycling and listens for DMR packets on the receive cycle. Once a payload is recovered it is then fed to the input buffer of the transmitter output cycle and wraps the output in the repeater output protocol to announce the output to the other receivers, all on the same frequency. Quote Link to comment Share on other sites More sharing options...
WindyCitySDR Posted June 16, 2015 Share Posted June 16, 2015 You have 2 options: 1) Use 2x HackRFs (1x receiver, 1x transmitter) - due to the 1/2 duplex nature 2) Use a bladeRF - as its full-duplex I can think of another option but not with an analog GSM radio. Use a single HackRF1 and set it to time division multiplex once a carrier is detected (46 mS receive or transmit and 4 mS idle) on a single frequency to sync with another HackRF1 on the opposite cycle. It's like having two, two stroke engines exactly operating exactly 180 degrees out of phase. The antenna ports (RX/TX) can either have their own antenna but will have better performance with a circulator in between them to feed a single antenna. DMR radios do a form of this today, albiet on two different frequencies to offer two voice paths. But a simplex DMR repeater sits in the receive mode and will sync with the first carrier to come up when an operator accesses it. The repeater starts cycling and listens for DMR packets on the receive cycle. Once a payload is recovered it is then fed to the input buffer of the transmitter output cycle and wraps the output in the repeater output protocol to announce the output to the other receivers, all on the same frequency. The solution was demonstrated this past weekend before TadHack 2015 @ IIT and I've posted about it here: https://forums.hak5.org/index.php?/topic/36044-wideband-sdr-successfully-demonstrated-before-tadhack-2015/ Quote Link to comment Share on other sites More sharing options...
bytedeez Posted July 15, 2015 Share Posted July 15, 2015 Getting real tired of shit, Martin. Quote Link to comment Share on other sites More sharing options...
cooper Posted July 15, 2015 Share Posted July 15, 2015 What was the title of that song from Frozen again...? Quote Link to comment Share on other sites More sharing options...
bytedeez Posted July 19, 2015 Share Posted July 19, 2015 Lol Cooper, I think this is the one you are referring to: https://youtu.be/5LlQNty_C8s Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.