[Hackrf-dev] Sensitivity

[John Malsbury]

Sensitivity is a broad term to use here...  especially since sensitivity is
really tied to a particular waveform.

To really understand performance you must consider:

   1. Noise figure
   2. IP3
   3. out of band rejection/selectivity
   4. Dynamic Range

A highly sensitive receiver with 2-bit quantization would not be useful if
you have a strong broadband jammer and poor out of band rejection.   (ie.
one on a radio telescope for example, see
http://en.wikipedia.org/wiki/United_States_National_Radio_Quiet_Zone)

For reasonable performance in either case you'll want to consder an LNA and
filter for either HackRF or RTL SDR.  For example:
http://ava.upuaut.net/store/index.php?route=product/product&path=72_73&product_id=99

-John



On Wed, Apr 1, 2015 at 8:08 PM, Tom N <vsboost at hotmail.com> wrote:

> Thanks Stefan,
>
> Just needed to confirm this with others.
>
> Completely understand that they are two different devices built on
> different hardware etc.. etc.. but at the end of the day receive
> performance is the one thing that really counts when using SDR and if i can
> barley pick up a community radio station on 151mhz that is only 10km away
> from me using the hackrf with the ant500 but the signal screams in using
> the $12 dongle and the same antenna then that's not on.
>
> If Mike ever considers a HackrfTWO please put receiver sensitivity/SNR at
> the top of your priority.
>
> Cheers
>
> ------------------------------
> Date: Wed, 1 Apr 2015 08:16:05 -0500
> Subject: Re: [Hackrf-dev] Sensitivity
> From: wageners at gmail.com
> To: vsboost at hotmail.com
>
> Yes, big time!
>
> Stefan
>
> On Wed, Apr 1, 2015 at 5:45 AM, Tom N <vsboost at hotmail.com> wrote:
>
> Am I correct in saying that a rtl dongle is more sensitive then the hackrf?
>
> I have done many tests with different software, sdr#, gqrx, sdr console
> and have tried every different gain setting, samplerates, bands, but my
> conclusion is that the SNR is better on the dongle.
>
> Can other members please confirm their findings comparing the two?
>
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>
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