[Hackrf-dev] Sensitivity

[Rainer Senke]

Hi,
from the discussions here I got several influences for a good rx-signal:

1) tuning the rf-, if- and bb-amplification for weak signals seems not
to be easy.
2) (but) it is easy to break the first LNA. (In this case 14 dB of
amplification are gone.)
3) there is an influence from strong signals in the frequence or
geographical neighbourhood to the sensitivity.
4) and of course the external conditions like selective amplifiers and
antennas.

Different rtl-dongles have also a great bandwidth of rx-sensitivity
but the amplification is easily tuned. From my experience optimized
rtl-dongles (like from nooelec) perform a little better but my old
dongles perform worse than hackrf. But none of them tune from 10 MHz
to 6GHz ;-)

Rainer


Am 03.04.2015 um 15:01 schrieb Alexandru Csete:
> On Fri, Apr 3, 2015 at 12:53 AM, Tom <vsboost at hotmail.com> wrote:
>> This is indeed interesting, are you able to take some screen
>> shots comparing the two..
>> 
>> Can any other owners confirm they get similar SNR between the
>> two.
> 
> Yes. My hackrf seems to perform at least as good, if not better,
> than the rtl dongle and certainly very close to the theoretical
> limit. Did you try other antennas than the one that comes with it.
> The antenna could be broken too.
> 
> HackRF screenshot: http://s2.postimg.org/ypsedty49/hackrf.png RTL
> screenshot: http://s13.postimg.org/z2ebqrnmf/rtlsdr.png
> 
> Both were taken with a piece of wire connected to the antenna 
> connector and the devices siting on my table.
> 
> Alex _______________________________________________ HackRF-dev
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