This hypersensitive behavior is a little odd for a device that is meant to be an experimental RF platform. Is there possibly a more robust front-end component set that could be substituted for the existing one?
FWIW, I routinely transmit 3 to 5-watt signals (usually ~10-15 seconds duration) using resonant antennas within a meter or two of my HackRF, and the preamp still works perfectly. -Scott Sent from my iPad > On Jul 1, 2015, at 7:13 PM, 王康 <[email protected]> wrote: > > Actually, you can tune to a FM station nearby, observe the signal > strength with preamp switched on and off, > using `osmocom_fft` or `gqrx`. > > If your signal peak become *higher* when preamp is *off*, then the > preamp is definitely blown. > > I made some batches of HackRF a year ago, and found that preamp can be > easily damaged even before shipped. > You may buy some preamp components, replace the broken one if needed. > >> On Wed, Jul 1, 2015 at 11:02 PM, Daniel Bernhardt <[email protected]> >> wrote: >> >>> Now the amp is presumed blown it acts more like an attenuator, i.e. signals >>> are weaker with it switched on. >> Not regarding your specific case: >> Is there a definitive way to determine if ones preamp is blown or not? For >> all we know it could be a faulty antenna setup or a cabling issue. Is the >> amp completely bypassed if turned off or just not amplifying? What are the >> symptomps of a "blown" amp? Does it short or are there signals coming >> through much weaker due to some cuppling effects? >> Forgive my ignorance on the matter. Just beeing curious. >> >> Daniel >> _______________________________________________ >> HackRF-dev mailing list >> [email protected] >> https://pairlist9.pair.net/mailman/listinfo/hackrf-dev > _______________________________________________ > HackRF-dev mailing list > [email protected] > https://pairlist9.pair.net/mailman/listinfo/hackrf-dev _______________________________________________ HackRF-dev mailing list [email protected] https://pairlist9.pair.net/mailman/listinfo/hackrf-dev
