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)Mehdi On Sat, Dec 5, 2015 at 6:09 PM, Michael Ossmann <m...@ossmann.com> 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 >
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