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:richnsand...@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-boun...@greatscottgadgets.com] On Behalf Of Rich S Sent: Monday, 13 July 2015 8:15 PM To: hackrf-dev@greatscottgadgets.com <mailto:hackrf-dev@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> _______________________________________________ HackRF-dev mailing list HackRF-dev@greatscottgadgets.com <mailto:HackRF-dev@greatscottgadgets.com> https://pairlist9.pair.net/mailman/listinfo/hackrf-dev
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