[Hackrf-dev] I lost the pre-amp on the HackRF. How to get it back ?

[scateu]

The preamp is electrostatic sensitive device. It seems to be broken easily. 

I had to replace it with soldering iron.

I think the other reason maybe transmitting while antenna port connects nothing, the reflection of RF signal breakdown the MGA-81563 preamp.

在 2014年8月26日，上午3:48，Ben Z en de rest <hoofdeigenwijs at gmail.com> 写道：

> Hi,
> I received my HackRF a week ago. Did run some tests on SDRSharp, works quite OK but a lot of imaging / mirrorred signals.
> 
> Switched to SDRConsole, much better, after setting bandwidth from auto to 5 MHz the imaging and mirrorred signals disappeared. 
> I did turn on the internal amplifier in SDRConsole. That way I was able to receive meteo sonde signals in the 403 MHz range. Turned it off for 70 cm signals and on again for some HAB balloon signals. All well so far.
> 
> Then I moved the HackRF to the Ubuntu 14.04 box and tried it on gqrx. Only the most strong signals where readable.
> 
> I started playing with the gain setitngs and noticed that the gain setting at the top ( 0 - 14 dB) should have to be the preamp settings. I did read in the faq that it would gain about 14 dB so I made the assumption that 0 was preamp off and 14 was preamp on.
> 
> After switching the gain to 0 dB I did receive more signals, but at 14 dB only the strongest local signals appear. So it seemed to me the preamp was not working anymore.
> 
> Tonight I re-connected the HackRF to the Windows laptop and started SDR console. With the preamp off I do receive signals but with preamp on only the very strong signals appear.
> 
> Is there anyone who can help me to get the preamp working again? I can not receive weak signals anymore....
> 
> Thanks,
> 
> Ben - PE2BZ
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