This gives the structure strength and reliability. In my case, I used a few metal stands to combine two boards. Don’t let the “digital” current flow over RF lines (CLOCK cable). GPIO3_8 of the Main board to the GPIO3_10 of the second.Īlso, it’s a really good idea to connect GND lines between two boards. On both boards.Īlso, connect GPIO3_10 of the Main board to GPIO3_8 of the second board. We need to PULL UP the GPIO3_11 and connect this line to the VCC 3.3. Take a look at the P20 connector near the CLOCK IO Now we need to add more wires between GPIO lines to correctly setup and sync both NXP CPUs. HackRF automatically switches to the new clock source, so both boards are now in sync (at clocking level). Data will be broken, and we will never be able to merge signals from both boards.ĭefine one board as Main and connect it CLKOUT to the CLKIN of the second board using SMA patch cable. Without the proper synchronization, bords will be sampling the data in different moments of time and out phase. HackRF has CLOCK input and output, which allows us to use the same clock source for both boards. Restart the board and repeat this procedure to the second HackRF. Then update CPU firmware: hackrf_spiflash -w hackrf_one_usb.binĪnd CPLD: hackrf_cpldjtag -x hackrf_cpld_default.xsvf Inside the release archive, you should find two binary files:ĬPU firmware: firmware-bin/hackrf_one_usb.binĬPLD firmware: firmware-bin/hackrf_cpld_default.xsvf Those files are under development and something might be broken.

I highly recommend using only release files, not pulled from the main source repository. At this moment, the latest version is 2018.01.1 Make sure that you have hackrf tools and libhackrf installed.ĭownload the latest release archive (not Source!) from the official repository.

We will see how to combine two HackRF boards into a single receiver to receive up to 40MHz bandwidth.įirst of all, it’s very important to ensure that both HackRF is flashed with the latest stable firmware. This is enough for typical tasks, but w need more to monitor something like a WiFI signal. I believe there is only one concern about this board is limited 20MHz bandwidth. Boards support external clocking and can be easily customized. For a reasonable price, you can get fully open hardware to monitor radio signals in a wide range (20MHz – 6GHz, but really up to 7GHz). HackRF One is a popular SDR transceiver and a really nice piece of hardware.

Hackrf one amplifier