[Hackrf-dev] HackRF One coverage

[Paul Connolly]

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
>> HackRF-dev at greatscottgadgets.com
>> https://pairlist9.pair.net/mailman/listinfo/hackrf-dev
>


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