Sorry I left out one link that would be useful https://github.com/mossmann/hackrf/wiki/HackRF-One#transmit-power
On 09/12/2015 12:57, Paul Connolly wrote: > You did not mention the frequency, type of antenna, modulation used, > data rate, if FEC used - I do not believe anyone can answer your > questions with the information provided. > > At least one HackRF has sent 50 bits of information 2299km over 2 (or > 15) minutes using a antenna designed for the 20 meter band (14MHz) using > the WSPR protocol. > https://twitter.com/argilo/status/501072471496601600 > https://twitter.com/argilo/status/501515208280375296 > > If you look at the command line arguments supported by hackrf_transfer > ... snip ... > [-a amp_enable] # RX/TX RF amplifier 1=Enable, 0=Disable. > [-l gain_db] # RX LNA (IF) gain, 0-40dB, 8dB steps > [-g gain_db] # RX VGA (baseband) gain, 0-62dB, 2dB steps > [-x gain_db] # TX VGA (IF) gain, 0-47dB, 1dB steps > ... snip ... > There are three gains for RX and two gains for TX. In gnuradio the exact > same would be true (so for RX the block has RF, IF and BB but for TX > only RF and BB) > RF RX/TX 0dB or 14dB > IF RX only 0-40dB, 8dB steps > BB RX 0-62dB, 2dB steps > BB TX 0-47dB, 1dB steps > > I would not enable the RF amplifier unless your antenna has a good SWR, > i.e. it was designed for TX. In fact I would not even TX unless your > antenna has a good SWR. If you are going to TX you should know a lot of > theory, and the laws that apply, so it would be best to get a amateur > radio license and learn both. > > For more to think about see: > https://en.wikipedia.org/wiki/Path_loss > https://en.wikipedia.org/wiki/Friis_transmission_equation > https://github.com/mossmann/hackrf/wiki/FAQ#what-is-the-receive-sensitivity-of-hackrf > https://en.wikipedia.org/wiki/WSPR_%28amateur_radio_software%29 > https://en.wikipedia.org/wiki/Standing_wave_ratio > > On 09/12/2015 10:34, 김상혁 wrote: >> Hi. I tried to send data and receive that using two hackrf one devices. >> >> In my test, hackrf can’t communicate if distance over about 1.5m >> >> What is the coverage of hackrf one ? >> >> And how can increase this coverage ? >> >> If it is solved by increasing Tx power, how can increase Tx power using >> osmocom block, which parameter effect to Tx power ? >> >> Thanks every replies . >> >> >> _______________________________________________ >> HackRF-dev mailing list >> [email protected] >> https://pairlist9.pair.net/mailman/listinfo/hackrf-dev >
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