Frank, I am no Hackrf expert, but I fear you fried the first stage of the receiver. The Wiki warning reads

"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."

Assuming you had an antenna connected when the 0.5 watt transmission was made, the power was probably just too much for the first stage. I would troubleshoot that portion of the radio."

The possible good news is that this probably happened to a lot of people so you should be able to get advice which components likely need replacing.

Good luck, Fred

On 4/16/2015 12:31 AM, [email protected] wrote:
----------------------------------------------------------------------

Message: 1
Date: Wed, 15 Apr 2015 21:56:27 +0200
From: Frank Pedersen <[email protected]>
To: hackrf-dev <[email protected]>
Subject: [Hackrf-dev] Help with troubleshooting rx on my possible
        broken  hackrf
Message-ID:
        <CAJCYWcgcOJwTNt=4zj-h4ShXj98kgH=0wtppjc3bo8anokh...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"

Hello and greetings,
I hope I can ask my question here..

I got my hackrf around 4 - 5 month ago, and it have been working flawless
until last night. First it was working great, then sudently no signal.
There was a guy that send out an rf signal on 0,5 w like 1 meter away from
me, but I can't believe that it would course it to break!?



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