HackRF
4.6 Transmit Power
HackRF One’s absolute maximum TX power varies by operating frequency:
• 1 MHz to 10 MHz: 5 dBm to 15 dBm, generally increasing as frequency increases (see this blog post)
• 10 MHz to 2150 MHz: 5 dBm to 15 dBm, generally decreasing as frequency increases
• 2150 MHz to 2750 MHz: 13 dBm to 15 dBm
• 2750 MHz to 4000 MHz: 0 dBm to 5 dBm, decreasing as frequency increases
• 4000 MHz to 6000 MHz: -10 dBm to 0 dBm, generally decreasing as frequency increases
Through most of the frequency range up to 4 GHz, the maximum TX power is between 0 and 10 dBm. The frequency
range with best performance is 2150 MHz to 2750 MHz.
Overall, the output power is enough to perform over-the-air experiments at close range or to drive an external amplifier.
If you connect an external amplifier, you should also use an external bandpass filter for your operating frequency.
Before you transmit, know your laws. HackRF One has not been tested for compliance with regulations governing
transmission of radio signals. You are responsible for using your HackRF One legally.
4.7 Receive Power
The maximum RX power of HackRF One is -5 dBm. Exceeding -5 dBm can result in permanent damage!
In theory, HackRF One can safely accept up to 10 dBm with the front-end RX amplifier disabled. However, a simple
software or user error could enable the amplifier, resulting in permanent damage. It is better to use an external attenuator
than to risk damage.
4.8 External Clock Interface (CLKIN and CLKOUT)
HackRF One produces a 10 MHz clock signal on CLKOUT. The signal is a 10 MHz square wave from 0 V to 3 V
intended for a high impedance load.
The CLKIN port on HackRF One is a high impedance input that expects a 0 V to 3 V square wave at 10 MHz. Do
not exceed 3.3 V or drop below 0 V on this input. Do not connect a clock signal at a frequency other than 10 MHz
(unless you modify the firmware to support this). You may directly connect the CLKOUT port of one HackRF One to
the CLKIN port of another HackRF One.
HackRF One uses CLKIN instead of the internal crystal when a clock signal is detected on CLKIN. The switch to or
from CLKIN only happens when a transmit or receive operation begins.
To verify that a signal has been detected on CLKIN, use hackrf_debug –si5351c -n 0 -r. The expected output with a
clock detected is [ 0] -> 0x01. The expected output with no clock detected is [ 0] -> 0x51.
4.6. Transmit Power 11
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