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Re: [Discuss-gnuradio] USRP source gain vs osmocom source gain?

From: Cinaed Simson
Subject: Re: [Discuss-gnuradio] USRP source gain vs osmocom source gain?
Date: Tue, 11 Jun 2019 16:37:47 -0700
User-agent: Mozilla/5.0 (X11; Linux i686; rv:60.0) Gecko/20100101 Thunderbird/60.7.0

On 6/11/19 3:33 PM, Eamon Heaney wrote:
> Hey all,
> I'm trying to turn the wifi receiver flowgraph in this repo
> (https://github.com/bastibl/gr-ieee802-11/blob/maint-3.8/examples/wifi_rx.grc)
> into one that will work with the HackRF.
> The example uses a USRP source, with a normalized gain of .75. I'm not
> sure how to translate that into parameters for the osmocom source, which
> has 3 gain options: RF gain, IF gain, and BB gain, all in dB.

RF gain=0, IF gain=32, and BB gain=32. These are general purpose
settings, i.e., don't use the RF gain unless you absolutely have to -
and you're certain there isn't a strong radio source nearby.


  hackrf_transfer --help

for the gain ranges and the step sizes.

-- Cinaed

> I tried setting the RF gain = 20log(.75) = -2.49877, but that just
> resulted in mangled packets.
> Any suggestions?
> -- 
> Eamon Heaney
> /
> /Fleet Commander/
> //
> /President, Model UN at Virginia Tech/
> /
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