Say Enter "RTL readlen=524288" in the 'ExtIO : Device hint' edit field, when that is what you mean
13 Aug
2012
13 Aug
'12
4:53 p.m.
OK I get it. I wish those who write this stuff were not so Cryptic and
Acronymous. On this page ... http://wiki.spench.net/wiki/USRP_Interfaces the
author has an entry that looks like this "RTL readlen=524288" yet nowhere in
the immediate text is there any language stating to enter this text in the
'ExtIO : Device hint' edit field, you have to sort of guess the author
thoughts. No one is ever thinking like the one who is doing the original
thinking so to reproduce original thinking adequate references to what the
author is thinking is required to reproduce the original thoughts in the
reader's mind. Literate illustration makes everything so much easier (and a
liberal sprinkling screen shots).
Thanks
Jay Salsburg
17 Aug
17 Aug
8:35 a.m.
New subject: RTL2832U: 7 or 8-bits ?
quick question concerning the RTL2832U ADC: is it 7 bit (as
stated on the Realtek web page in the cryptic "7-bit ADC for
RF signals level measurement" or 8-bit as stated on the osmosdr
web page ? or is it 7 bit + sign = 8 bits ?
I am computing the gain from oversampling wrt a sound card, and
not that it matters much but I'd rather have the figures right.
Thanks, JM
8:43 a.m.
New subject: RTL2832U: 7 or 8-bits ?
Hi,
quick question concerning the RTL2832U ADC: is it 7
bit (as
stated on the Realtek web page in the cryptic "7-bit ADC for
RF signals level measurement" or 8-bit as stated on the osmosdr
web page ? or is it 7 bit + sign = 8 bits ?
8 bits AFAIK.
The "7-bit ADC for RF signals level measurement" is most likely just
an RSSI measurement ADC.
Cheers,
Sylvain
9:09 a.m.
New subject: gr-osmosdr disable RTL2832U AGC ?
another question:
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 ? As an
option provided to the gr-osmosdr block ? should the DAGC value be
set to some specific value then ? Or kept at minimum value ?
Thanks, JM
10:36 a.m.
New subject: gr-osmosdr disable RTL2832U AGC ?
Hi,
On 17.08.2012 09:09, friedtj(a)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
3:17 p.m.
New subject: gr-osmosdr disable RTL2832U AGC ?
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(a)steve-m.de>
À: osmocom-sdr(a)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(a)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
10:30 a.m.
New subject: RTL2832U: 7 or 8-bits ?
Hi,
On 17.08.2012 08:35, friedtj(a)free.fr wrote:
quick question concerning the RTL2832U ADC: is it 7
bit (as
stated on the Realtek web page in the cryptic "7-bit ADC for
RF signals level measurement" or 8-bit as stated on the osmosdr
web page ? or is it 7 bit + sign = 8 bits ?
8 bit, the "7-bit ADC for RF signals level measurement" is the RSSi-ADC
than can be used to measure the signal power as reported by some tuners.
Regards,
Steve
4280
days inactive
4284
days old
6 comments
4 participants
participants (4)
-
friedtj＠free.fr -
Jay Salsburg -
Steve Markgraf -
Sylvain Munaut