Search found 7 matches

by lsmod
Thu Mar 16, 2017 10:15 am
Forum: RTL-SDR Discussion
Topic: How to count and identify carrier frequencies?
Replies: 13
Views: 9244

Re: How to count and identify carrier frequencies?

However for satellite IF reception purposes cheap variable 0-20 dB are available, which are unlike the high quality ones for labarotory use, not designed to be adjusted to often e.g. https://www.amazon.de/SAT-D%C3%A4mpfungsregler-D%C3%A4mpfungsglied-D%C3%A4mpfungssteller-2400/dp/B0020JC69C. Good an...
by lsmod
Thu Mar 16, 2017 9:25 am
Forum: RTL-SDR Discussion
Topic: How to count and identify carrier frequencies?
Replies: 13
Views: 9244

Re: How to count and identify carrier frequencies?

Thank you for the mass of tips! Now i must see to use them ... 1. I am using an RTL-SDR with additional antenna amplifier and an up-converter for frequencies below 70 MHz. I built this up here: http://www.darc-husum.de/sdr-konverter.html 2. So far the antenna is simply an wire of about 1,50m Up to n...
by lsmod
Wed Mar 15, 2017 1:52 pm
Forum: RTL-SDR Discussion
Topic: How to count and identify carrier frequencies?
Replies: 13
Views: 9244

Re: How to count and identify carrier frequencies?

Thanks - that is very interesting.

I should make the test with the 20 to 40 dB attenuator.
Use a simple resistor devider?

The frequencies are in different ranges, as you can see in the screenshots.
For automatic measurements it is difficult to make a calibration of the antenna.
by lsmod
Tue Mar 14, 2017 8:21 am
Forum: RTL-SDR Discussion
Topic: How to count and identify carrier frequencies?
Replies: 13
Views: 9244

Re: How to count and identify carrier frequencies?

The source of the interference would be interesting. Any idea how to locate them with simple tools? The main goal is to record the count and intensity of this phenomenon over the time. I would scan every 10 minutes different frequency ranges and report the result into an database. Then i must think ...
by lsmod
Mon Mar 13, 2017 8:20 pm
Forum: RTL-SDR Discussion
Topic: How to count and identify carrier frequencies?
Replies: 13
Views: 9244

Re: How to count and identify carrier frequencies?

Thank for your answer. I think i just have to play around with the parameters of rtl_power and make some experiments. Then i have to find some tools to visualize the results. The heatmap script seems not to be as flexible as needed. My hope was that someone already has a solution for such a analyze ...
by lsmod
Mon Mar 13, 2017 9:09 am
Forum: RTL-SDR Discussion
Topic: How to count and identify carrier frequencies?
Replies: 13
Views: 9244

Re: How to count and identify carrier frequencies?

Sorry for my delayed answer. I already read a little bit about rtl_power, but there are no good examples for using it. Is there somewhere a better documentation? I could found this here that is not bad, but it is not really detailed. http://kmkeen.com/rtl-power/ What do you mean with "run a threshol...
by lsmod
Sun Mar 05, 2017 4:01 pm
Forum: RTL-SDR Discussion
Topic: How to count and identify carrier frequencies?
Replies: 13
Views: 9244

How to count and identify carrier frequencies?

Hi, how it is possible to make an automatic analysis of a frequency band? I am working in Linux and i want to identify or at least count carriers as shown in the pictures. Perfect would be a solution that can step through a frequency range and identify carriers with it frequency and level. One probl...