I ve checked my connections and they seem to be ok.
Sdr noise floor.
Written by admin 10 comments posted in amateur radio hf rtl sdr tagged with hf noise floor rtl sdr rtl2832 rtl2832u january 17 2017 lowering the noise floor on hf with high quality coax bonito is a company that sells various products such as their own small active antennas.
Any ideas on what may be causing this bouncing and how i can minimise it.
The better shielded coax may be attenuating high power higher frequency signals e g.
With the rtl sdr having an 8 bit adc you hit sampling noise pretty quickly.
Vhf fm broadcast outside the band of interest which is hf 30mhz.
That s actually the more likely the noise that most people see than thermal noise.
Some of the issues that i have encountered in the past have been remedied by recent updates.
My objective was to calculate sdr spectrum noise floor from first principles using the above formula.
Ultimately your thermal noise is dependent on what you put in front of a rtl sdr.
Purists will not be happy they rarely are but it works for me.
Unless you put an lna in front of it.
Sdr spectrum noise floor running the numbers.
Take the output from the sdr radio ignore 15 of the bandwidth at the high and low end of the output to avoid the ant alias filtering and we re left with a healthy 70 of the.
The sdr that i use next to my transceiver is the airspy spyverter combination.
He said that i may have an issue with the rsp.
It should like any other receiver have a certain noise floor nf but this figure was hard to find on the internet so that i decided to measure it myself.
In this blog i will describe how i measured the nf the.
January 24 2017 1 24 pm drone.
Again the noise floor on the sdr is around 70db and i did just as well or better with one of those bnc connected accessory wires that come with many sw radios.
A few weeks previously a reasonable logic was implemented for measuring the noise floor.
Written by admin posted in amateur radio hf rtl sdr tagged with hf noise floor rtl sdr rtl2832 rtl2832u 10 comments.
First i would like to preface this article by saying that gr limesuite and the limesdr drivers are updated fairly regularly.
When recording a pass of noaa 18 i noticed that the noise floor was bouncing up and down causing lines on the image.
Sawbird lna nooelec nesdr smartee sdr 0 90001 msps.
I actually emailed dennis at bonito.
Entering the noise floor.
I ran two receivers rsp2 and perseus side by side sharing the same antenna on the same frequency.
He saw the screen shots and pointed out that high noise level.
