Hello, I have a pre modified rtl-sdr like this Ebay-Artikel Nr. 400846220428 which can receive vhf and shortwave directly. On windows shortwave listening works fine with hdsdr if I enable direct-sampling on Q branch in extIO. Now I am on Linux and I am tested gnu radio. GNU Radio is by building with blocks a very powerful tool. But it seems there is no way to receive HF except with a HF up converter. I there any other way to receive shortwave on GNU radio? Thanks for your answers in advance.
on 2015-10-04 20:17
on 2016-02-24 22:56
Hello, the solution is to use "direct_samp=2" in the device arguments. Tested with both GNU Radio and GQRX (the latter has to be restarted after switching to direct sampling mode). I also have a modified RTL-SDR (PCB says it's by BA5SBA), which looks just like the OP's one. Arguments for the Osmocom/RTL-SDR source block are documented here: http://sdr.osmocom.org/trac/wiki/GrOsmoSDR#RTL-SDRSource