Search found 4 matches

by ajforrest
Sat Nov 21, 2020 3:00 am
Forum: RTL-SDR Discussion
Topic: General troubleshooting for receiving HF signals
Replies: 1
Views: 448

General troubleshooting for receiving HF signals

I'm looking for advice on how to go about troubleshooting a reception challenge I'm experiencing in the 3-5 MHz range. I have the V3 dongle with a dipole antenna and I'm using GQRX on Mac to run it. The dongle works fine in the usual frequency range and I'm able to find, tune and demodulate FM radio...
by ajforrest
Sun Nov 15, 2020 1:46 am
Forum: RTL-SDR Discussion
Topic: What is simplest software that will direct sample with an appropriate sample frequency?
Replies: 5
Views: 837

Re: What is simplest software that will direct sample with an appropriate sample frequency?

Thanks to all who have responded.

I've since learned that apparently I can get a bandwidth B centered at frequency F sampled, presumably by appropriate filtering and aliasing. Off to figure that out now.
by ajforrest
Fri Nov 13, 2020 1:50 pm
Forum: RTL-SDR Discussion
Topic: What is simplest software that will direct sample with an appropriate sample frequency?
Replies: 5
Views: 837

Re: What is simplest software that will direct sample with an appropriate sample frequency?

Thanks for the reply Alan. I was basing this understanding on this text from the v3 user guide : Note that this feature makes use of direct sampling and so aliasing will occur. The RTL-SDR samples at 28.8 MHz, thus you may see mirrors of strong signals from 0 - 14.4 MHz while tuning to 14.4 - 28.8 M...
by ajforrest
Fri Nov 13, 2020 3:47 am
Forum: RTL-SDR Discussion
Topic: What is simplest software that will direct sample with an appropriate sample frequency?
Replies: 5
Views: 837

What is simplest software that will direct sample with an appropriate sample frequency?

I have the RTL-SDR BLOG V.3 dongle and I wish to capture some raw data from somewhere in the single-digit MHz range (e.g. 4 MHz). Various GUI apps seem to be "too helpful" and I don't end up with the number of samples I expect. I switched to rtl_tcp with the direct sampling option from the blog's gi...