[Hackrf-dev] HackRF One coverage

[Paul Connolly]

I just double checked in the source of
gr-osmosdr/lib/hackrf/hackrf_sink_c.cc and I find it a bit confusing
that the command line hackrf_transfer tool uses enable amplifier(RF) and
BB gain, but the gr-osmosdr block uses RF and IF for the same two TX gains.
So for a osmosdr sink block, when using a hackrf, the TX gains are:
RF 0 to 14 in steps of 14 (off or on)
IF 0 to 47 in steps of 1
And for a osmosdr source block, when using a hackrf, the RX gains are:
RF 0 to 14 in steps of 14 (off or on)
IF 0 to 40 in steps of 8
BB 0 to 62 in steps of 2

So RF corresponds to the "-a" switch which makes sense for both RX and
TX, even though it is two p[physically separate amplifiers on the board.
IF (RX) corresponds to "-l"
BB (RX) corresponds to "-g"
Logically I would expect BB (TX) to correspond to "-x", but it is
actually IF (TX), that is confusing.
        [-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

On 09/12/2015 13:02, Mitja kocjančič wrote:
> TX Power depends on varaety of factors (frequency, IF, RF, BB Gain)
> unfortiunatly there is no TX Power value in osmocom block so that means you
> must tinker with RF and IF Gain (if you want 15dbm on 76 Mhz you put
> everything to maximum (as I can't remember maximum values for IF, RF and BB
> Gain I just put 1000 in every field)
>
> On which frequency did you mesure coverage? (I can get (on 76 Mhz) 1 KM
> using ANT500 Antena (you can always use external amplifier to boost the
> coverage or you can any directional antena (yagi for instance (antena
> designed for specific freqency like 98Mhz (it works on upper frequencys too
> but it won't preform as well))
>
> I know that if I try to transmitt AM below 10 Mhz like 1 Mhz or 918khz I
> can't even get to 1m if I try on 10 Mhz I can get 2 meters
> I didn't try on 2 GHZ because I don't have any good equpment (that would
> demodulate signal only) I have RTL-SDR But thats crap for sensitivity so
> don't use it to mesure anything
>
>
>
>
>
>
> 2015-12-09 11:34 GMT+01:00 김상혁 <tkdgur7896 at gmail.com>:
>
>> 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 .
>>
>>
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>>
>
>
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