This is merely a historical archive of years 2008-2021, before the migration to mailman3.
A maintained and still updated list archive can be found at https://lists.osmocom.org/hyperkitty/list/osmocom-sdr@lists.osmocom.org/.
Michał Rogala michal.rogala at gmail.comHi! Thanks, would be great if it turns out that those changes improve reception :). What I've seen in source code FC0013 also has regulated IF bandwidth filter, although in very limited steps - 8 MHz, 7 MHz, 6 MHz. best regards and thank you for great work :) Michal Rogala W dniu 1 kwietnia 2012 04:53 użytkownik Balint Seeber <balint256 at gmail.com> napisał: > Hi Michal, > Thank you for asking the question - I was thinking about this too last night > (actually this morning) while I was trying to catch up on some sleep, but my > brain wouldn't stop ticking over :) > > Can't be sure of the effect as datasheets aren't public, but I will > experiment with narrowing the bandwidth. The 'IFfilter' function in the > E4000 tuner code is made up of a massive if/else block that sets various > register values by checking the input IF-BW values from <= 2150 to > 5500, > so it appears to support a wide range (despite the convenience > 'E4000_BANDWIDTH_HZ' enum in the header). > > Will post findings a little later, unless someone beats me to it :) > > Kind regards, > Balint > > PS: "Software-Defined Radio For $11" on Slashdot! > http://hardware.slashdot.org/story/12/03/31/1914217/software-defined-radio-f > or-11 > > PPS: I've been working to improve the GNU Radio Source block and Windows > plugin with generous feedback from the community. Grab them here if you > wish: > http://wiki.spench.net/wiki/gr-baz#rtl_source_c > http://wiki.spench.net/wiki/USRP_Interfaces > >> -----Original Message----- >> From: Michał Rogala [mailto:michal.rogala at gmail.com] >> Sent: Sunday, 1 April 2012 4:36 AM >> To: balint256 at gmail.com; osmocom-sdr at lists.osmocom.org >> Subject: RTL-SDR: E4000 IF bandwidth >> >> Hi! >> >> I've just noticed one issue about E4000 driver that bothers me - IF >> bandwidth at the chip is set to 8 MHz, where maximum bandwidth of RTL2832U >> sampling is 3.2 MHz. >> >> Wouldn't reducing IF bandwidth at tuner chip improve overall sensitivity >> (and maybe noise level)? >> >> best regards >> >> Michal Rogala >