[Hackrf-dev] Yippee!

[王康]

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

>

>

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