This is a DIY project, do not ask me to make the HackRF TX amp. Consult the local law and rules before transmitting ! Also, transmitting with higher power level then allowed may get you in trouble but you can get others in trouble too. Note: First of all, you should be aware that transmitting without licence may get you in trouble. In this case no damage should occur on the slave equipment used. Ports or other devices from excessive current instead of 0 ohm required for the modification the SMD 0805 size resettable fuse 100mA or 160mA should be used. With the static) it can draw more than 250mA, in some cases even maximumĬurrent that the supply can deliver. The performance of the LNA4ALL remain almost the same, just the IP3 is a bit lower, but also the NF is a bit better resulting the lower consumption of 35mA comparing to 60mA when 5V is used. All you need to do is to insert the 10uH SMD coil and 0 ohm SMD bridge (or just a piece of wire) on the green marked components and you can use the benefit of the HackRF phantom power. The LNA4ALL can operate also on 3.3V where the consumption is cca. You can not transmit through the LNA4ALL using this modification. This can be used to power the LNA4ALL just in the RX mode. There is the phantom power (3.3V & 50mA) option on the HackRF antenna port, software control. So beware of this facts.Īfter a couple of queries how to pair the LNA4ALL with the HackRF here is the simple explanation to make the life easier for the user. Using the antiparalel diodes will degrade NF and S11 a bit and there is a treat of the intermodulation products created on the diodes if the strong broadcast signals are present on the antenna. The solder mask should be scratched off and the BAV99 diode soldered (green on the next slide) on the antenna input. This may save your LNA but not from the direct thunder hit :-) This can not be always possible and handy so the only protection that is used widely is to bridge the input antenna with the BAV99 antiparalel pair of diodes like on the next slide. So how to protect the LNA? The best way is to disconnect the antenna and before connecting the same back, properly ground and discharge the antenna. We do receive some letters indicating the problem where the MMIC is damaged due to statics or corona discharge effect on the antenna constantly connected to the LNA. Another very common question is how to protect the LNA from the statics coming from the antenna.

Hackrf one amplifier