[Hackrf-dev] Yippee!

[Michael Ossmann]

Good catch.  I fixed the help in git, and I swiped -i for the IF
frequency control since it didn't make any sense for RX VGA (baseband)
gain (which is now -g).

Mike


On Sat, Mar 15, 2014 at 12:24:15AM +0800, 王康 wrote:

>

> Osmocom Sink has three gain,

> 

> RF gain , which is the switch for 14dB MGA-81563 amplifier.

> 

> IF gain ,

> runs from 0 - 47 dB in osmocom_siggen

> runs from 0 - 40 dB in osmocom_fft

> 

> And BB gain,

> RX: 0 - 62 dB (osmocom_fft)

> 

> 

> 

> So I guess

> 

> -l  , set lna gain, means RX(osmocom source) IF gain, 8dB steps , 0-40dB

> -i  , set vga(if) gain, means RX(osmocom source) BB gain, 2dB steps, 0-62dB

> -x , set TX vga gain, means TX(osmocom sink) IF gain, 1dB steps, 0-47dB

> -a , RF gain , controls 14dB MGA-81563 amplifier , and both RX and TX chain

> have its own MGA-81563, so it works for both RX and TX. 14dB or 0dB

> 

> 

> And I think we should update the help info of hackrf_transfer.

> 

> 

> 

> On Saturday, March 15, 2014, Michael Ossmann <mike at ossmann.com> wrote:

> 

> > I tested with mine, and it had no effect.  The MAX2837 documentation

> > says that the LNA (controlled by hackrf_transfer -l) is for RX only.

> >

> >

> > On Fri, Mar 14, 2014 at 02:29:29PM +0800, 王康 wrote:

> > >

> > > I tested it on my Spectrum Analyzer and it does have an effect.

> > >

> > > On Friday, March 14, 2014, Hunter <neversphere at gmail.com> wrote:

> > >

> > > > Is the lna gain for tx? I thought that was for input.

> > > >

> > > >

> > > > On Thu, Mar 13, 2014 at 10:47 PM, 王康 <scateu at gmail.com

> > <javascript:_e(%7B%7D,'cvml','scateu at gmail.com');>

> > > > > wrote:

> > > >

> > > >> You can add a -l parameter, like

> > > >>

> > > >> hackrf_transfer -t car.iq -f 27000000 -s 8000000 -a 1 -l 30 -x 40

> > > >>

> > > >>

> > > >>

> > > >> By the way, I analysis a toy remote controlled car , and rebuild the

> > signal baseband,

> > > >>

> > > >> then build a Qt control GUI.

> > > >>

> > > >> You can check it on  github.com/scateu/gr-remotecar

> > > >>

> > > >>

> > > >>

> > > >>

> > > >> On Fri, Mar 14, 2014 at 1:20 PM, Hunter <neversphere at gmail.com

> > <javascript:_e(%7B%7D,'cvml','neversphere at gmail.com');>

> > > >> > wrote:

> > > >>

> > > >>>  I just got a capture & replay working with the latest version of

> > > >>> hackrf_transfer. My next step is amplification for the sending side.

> > I'm

> > > >>> working with the 433 MHz band at the moment. Any pointers?

> > > >>>

> > > >>> _______________________________________________

> > > >>> HackRF-dev mailing list

> > > >>> HackRF-dev at greatscottgadgets.com<javascript:_e(%7B%7D,'cvml','

> > HackRF-dev at greatscottgadgets.com');>

> > > >>> http://nine.pairlist.net/mailman/listinfo/hackrf-dev

> > > >>>

> > > >>>

> > > >>

> > > >

> >

> > > _______________________________________________

> > > HackRF-dev mailing list

> > > HackRF-dev at greatscottgadgets.com

> > > http://nine.pairlist.net/mailman/listinfo/hackrf-dev

> >

> >