Архив за 05.06.2019

RTL-SDR Discussion • Re: ExtIO_RTLSDR# — custom ExtIO for RTLSDR

Here is update with BIAS TEE check box :)

I added a new function to librtlsdr:

CODE:

int rtlsdr_get_bias_tee(rtlsdr_dev_t *dev)
it needs in order to get current state of bias tee.
Later I will submit changes to librtlsdr sources.
But you can also use old rtlsdr.dll with this ExtIO, it just will not be able to get current state of bias tee at startup and checkbox will be in undetermined state. You can still use it if rtlsdr.dll contains function rtlsdr_set_bias_tee

I added warning window with confirmation for enable BIAS TEE.
Please check that your antenna is not DC short circuit (for example magnetic loop), otherwise do not enable BIAS TEE. Read RTLSDRv3 documentation for details.
ExtIO_RTLSDR_u8-1.1.1.5.zip

Statistics: Posted by qrp — Wed Jun 05, 2019 5:45 am


SignalsEverywhere: What SDR To Buy? Choose the Right one For You

Over on his YouTube channel SignalsEverywhere, Corrosive has just released a new video titled "Software Defined Radio Introduction | What SDR To Buy? | Choose the Right one For You". The video is an introduction to low cost software defined radios and could be useful if you're wondering which SDR you should purchase.

The video includes a brief overview of the Airspy, KerberosSDR, PlutoSDR, LimeSDR Mini, HackRF, SDRplay RSPduo and various RTL-SDR dongles. In addition to the hardware itself Corrosive also discusses the compatible software available for each SDR.

Software Defined Radio Introduction | What SDR To Buy? | Choose the Right one For You

RTL-SDR Discussion • Re: ExtIO_RTLSDR# — custom ExtIO for RTLSDR

19ac728 wrote:
Mon Jun 03, 2019 7:58 pm
You could also make the bias-t in it?
nice idea, I will look how to do it.
But this operation may be unsafe, since enable bias-t for magnetic loop antenna may leads to hardware malfunction. So, there is need additional check for enable it.

I've realized that trying to use scale for calibration is not good idea, it leads to problem with determining ADC dBFS value.
So, I replaced scale to use 0 dBFS of ADC as full scale. New ExtIO provides float samples in range -1..+1.
When level is near to 0 dB, it means that ADC is near to overload and there is need to add attenuator on the RTLSDR input.
Here is a new version v1.1.1.4, it allows to see when ADC is near to overload level.
ExtIO_RTLSDR_u8-1.1.1.4.zip

Statistics: Posted by qrp — Wed Jun 05, 2019 3:12 am


Detecting Walkie Talkie chatter using a Pi where frequency is unknown

I'm attempting to discover walkie talkie chatter using a Pi and an RTL-SDR. Google tells me this falls into the 30MHz – 300MHz band which is pretty wide.

Because people aren't guaranteed to be talking I'd like to leave a Pi recording this band and later play back the data to discover frequencies people are talking on. Is this possible? What's the best approach

submitted by /u/Manifest122
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Geometric correction in linux?

Hi! I am looking for a piece of software to add to my current scripts which automatically capture, downsample, and decode APT and LRPT images from NOAA and Meteor-M 2. I am currently looking for a commandline based program which can apply geometric correction to Meteor captures for the distortion at the edges.I know this has been done on Windows via meteorgis, but I would like to keep everything on a raspberry pi. Does such a program exist, and where could I find it?

submitted by /u/tgyk
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