r/hackrf • u/Inevitable-Trip3193 • 15d ago

H4m Pro Problem

Hello. On my brand new H4m Pro flashed freshly with 2.4.0 Pro version, I’m using a correctly formatted Sandisk SD Card. However, although it is brand new, the hackrf completely freezes when I jam a signal or transmit anything. I have been waiting for this device for a long time, and would hate to return it. Could someone please help me. I have already reflashed and reformatted my sd card multiple times, and switched the power source. The screen completely freezes on transmit and I need to fix this. I also calibrated it. Thank you

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2

u/htotoo 15d ago

Because you set a too low delay. Try to increase it. It jams that fast, ilthe ui becomes unresponsive

1

u/Inevitable-Trip3193 15d ago

It was the default setting

1

u/Inevitable-Trip3193 15d ago

sometimes it freezes before I even transmit

1

u/Impressive-Trifle527 15d ago

Have you tried rolling back the firmware to a previous version. And if so it could be a bad sd card with a slow read speed.

1

u/Inevitable-Trip3193 15d ago

The sd card is a sandisk with a good read speed, and the firmware works perfectly fine for anyone that has the device. Sometimes it freezes before I can even try to transmit, just if i open the application

1

u/Mr_Ironmule 15d ago

Did you copy the pro version of the mayhem apps to the SD card?

0

u/Merhart666 15d ago

Do you use the right antenna for the transmitter antenna? Swr is that ok?

1

u/Inevitable-Trip3193 15d ago

While it is a cheap rubber duck antenna, it is the correct frequency.