[Hackrf-dev] Sensitivity

[Tom]

Thanks Rich,

 

Are you or anybody else in a position to do a test for me like the one I
have attached in my previous email, even if you don't have SDR#, gqrx or
even osmocom_fft will be sufficient.

 

Cheers

 

From: Rich S [mailto:richnsanders at gmail.com] 
Sent: Tuesday, 14 July 2015 7:09 AM
To: Tom
Subject: Re: [Hackrf-dev] Sensitivity

 

True, but since these are not "pro" grade pieces of equipment, they will
have different frequency sweet spots, and conversely different frequency
valleys.  In fact the only true way, would be to connect them to a frequency
generated piped into a anechoic chamber and run every frequency to plot the
chart.

On 7/13/2015 9:26 AM, Tom wrote:

Hi Rich,

 

Only issue I have with your test method is that the gain settings should
have been adjusted for max SNR, I notice you have the gain settings set the
same for both devices in your test.

 

For example using a similar flow graph for the RTL dongle with the default
settings of rf=10,if=20,bb=20 I get a signal of -50db with noise -75db, if I
increase the rf from 10 the point before it overloads which for me at that
particular frequency is rf=35 then the signal is at -25db noise at -65db,
that's a 25db increase in signal and 10db increase in noise.

 

 

 

From: HackRF-dev [mailto:hackrf-dev-bounces at greatscottgadgets.com] On Behalf
Of Rich S
Sent: Monday, 13 July 2015 8:15 PM
To: hackrf-dev at greatscottgadgets.com
<mailto:hackrf-dev at greatscottgadgets.com> 
Subject: Re: [Hackrf-dev] Sensitivity

 

I did this comparison a bit ago using GNURadio because I could make all the
settings identical without having to worry about how SDR# was programmed.
Typically, you would not want to run the HackRF at 2 MSPS, but to keep the
comparison accurate, I did.

>From my dropbox:  

https://www.dropbox.com/s/v18qzlpojpnybjj/RT820vsHackRF.pdf?dl=0

On 7/13/2015 12:11 AM, Tom wrote:

Sorry to re hash and old topic but can I ask if any member can do a
screenshot like the one I have linked in below comparing an RTL dongle and
the HackRF using SDR#, I'm about -10db worse on the HackRF without using the
amp.  Just want to make sure this is normal behaviour or a fault.

 

Thanks

 

 

https://mega.co.nz/#!MwUxVIZS!JWhfoou7LcwI6HeHVU5jxsfsamFpADulwez6Wz6oNEk
<https://mega.co.nz/#%21MwUxVIZS%21JWhfoou7LcwI6HeHVU5jxsfsamFpADulwez6Wz6oN
Ek> 

 







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