gr-osmosdr disable RTL2832U AGC ?

friedtj at free.fr friedtj at free.fr
Fri Aug 17 13:17:14 UTC 2012


wonderful pictures. What NFM settings do you use ? surprisingly I had better
results with excessively narrow settings (5 kHz bandpass, 1 kHz cutoff bandwidth)
compared to the expected 45 to 50 kHz wide setting expected for this mode. I am
leaving mid-september for some remote northern area and would love to take the EZCAP
with me to demonstrate satellite reception using lightweight equipment (as opposed
to a dedicated receiver + car battery).

JM


----- Mail original -----
De: "Steve Markgraf" <steve at steve-m.de>
À: osmocom-sdr at lists.osmocom.org
Envoyé: Vendredi 17 Août 2012 10:36:20
Objet: Re: gr-osmosdr disable RTL2832U AGC ?

Hi,

On 17.08.2012 09:09, friedtj at free.fr wrote:
> all my attempts at recording signals from satellites (NOAA POES
> weather satellites and ISS) have so far failed. For NOAA, I can
> sometimes get a faint signal, but nothing worth decoding to get
> a weather map (even with a 25 dB LNA preamp). Now, I have found
> one web page (cannot remember where) associating the poor
> receiver sensitivity to the RTL2832U DAGC. I remember seeing on this
> list that someone had managed to disable this DAGC, but is this
> functionality avaiable in the gnuradio gr-osmosdr block ?

The DAGC is disabled by default in current librtlsdr, so if you use a 
recent version you should have no problems.
In fact, my reception was fine when I tried it (even without LNA).

See http://rof.li/pic/groundplane/

Regards,
Steve






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