If you're receiving, don't use the RF gain - use the IF and BB gains. If you're transmitting, be careful, assuming no loses, 10 mW of reflected power may fry the RF amplifier.
And note, there most likely a DC offset on the center frequency. You should use hackrf_transfer -r /dev/null to test your CPU and USB. See https://greatscottgadgets.com/sdr for tutorials on the HackRF One. -- Cinaed On 08/29/2016 08:58 PM, jed martin via HackRF-dev wrote: > i was going to ask what i was doing wrong, but while waiting for > subscription to this list to complete, i was playing with settings in > gqrx, and kind of stumbled on the answer to my question... > > i've been trying to use my hackrf to listen to the 80M ham band (as well > as 160M and other assorted stuff in that part of the spectrum) part of > the problem i was having was that gqrx has a few "presets" for the > hackrf sample rate, and with the default > 8Mhz sample rate, if i tuned the center frequency below 8Mhz, i just got > a lot of hash from interaction of signals within the hackrf. so, i tried > something not in the list of presets... setting the sample rate at 3Mhz, > and setting the center frequency at something like 3.57Mhz (i tried a > few different center frequencies and used the one that generated no > hash). then it was working within the 80M band, but something was still > amiss, it was all backwards, the digital section was up around 4Mhz, and > the phone section at the lower end, and LSB was USB.... while playing > with the Input Controls settings, i clicked the Swap I/Q box, and it > flipped everything back to where it should be... it's a good thing i > knew what i was looking for (i.e. what parts of the band are digital vs > phone, and that 80M phone should be LSB) or i would still be > befuddled... i actually like the hackrf better than the sdrplay. it > seems to have better s/n performance. i think the sdrplay linux driver > needs a bit of work, and when i recently upgraded the version of Skywave > linux i'm using, the new sdrplay driver was really broken (which is the > reason i tried the hackrf in place of it) > > one question though... the 14db input amp has a limit of -5dbm? that's > about 200mV or so... i've been using it, but i need to keep all RF > sources that can induce that much voltage into the antenna system far > away from it, even if it's a cell phone and i'm using the radio on HF, > correct? > > > _______________________________________________ > 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
