> On Dec 6, 2015, at 3:34 AM, MA <[email protected]> wrote: > > Hi Michael. > He (and another user) have managed to run that code successfully with HackRF. > The number 40 is a measurement of GPS signal strength by a common software we > both use on Android ("AndroiTS GPS Test"). > The common things we use: Android OS(different versions) and that GPS app, > ANT500 antenna, the code itself and HackRF One. > Does the firmware affect this? (The author uses HackRF board r2-p1 with > 2014.08.1 and that user uses 2015.07.2 version)
Yes. Each difference is a variation more variation more variable answers. Once everything is the same it sounds like everything maybe within tolerances, Ben > > Mehdi > > > On Sat, Dec 5, 2015 at 6:09 PM, Michael Ossmann <[email protected] > <mailto:[email protected]>> wrote: > On Sat, Dec 05, 2015 at 05:15:42PM +0330, MA wrote: > > > > Update: I think my HackRF is not faulty; I created a simple FM > > transmitter with GNU Radio and set the frequency to 2.0GHZ; But I > > think it may have a drift/offset problem, because on another SDR > > (receiver), I get that FM on about 14KHZ further !! (on 2.000.014.000 > > HZ) > > 14 kHz offset at 2 GHz is 7 parts per million. That is well within the > expected range. The crystal on HackRF One is specified to have clock > stability of +/- 20 parts per million. > > However, your other SDR receiver isn't perfect either, so it may be > adding to or subtracting from the apparent clock offset of the HackRF > One. > > HackRF One has a clock input that can be used if you would like to > synchronize it to a more stable clock source. > > > > He uses a 20dB attenuator at the output (with ANT500) and the signal > > > strength on his Android GPS diagnostics app is about 40. > > > I don't use an attenuator and still my signal strength rarely reaches 30 ! > > What unit of measurement is that? Are you and he using the same Android > hardware and software version? Was he using a HackRF One with the same > software/firmware version and configuration as yours? > > Mike > > _______________________________________________ > HackRF-dev mailing list > [email protected] > https://pairlist9.pair.net/mailman/listinfo/hackrf-dev
_______________________________________________ HackRF-dev mailing list [email protected] https://pairlist9.pair.net/mailman/listinfo/hackrf-dev
