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RTL-SDR Discussion • «RTL SDR dongle not working as expected» — SDR noob questions.

Hi there,
just got my RTL-SDR USB dongle, the blue one,
System Linux Fedora 24 32 bit, on i3@2.2GHz/4GB RAM,
lsusb reports:
Bus 002 Device 003: ID 0bda:2838 Realtek Semiconductor Corp. RTL2838 DVB-T
installed SDR packages from network repo:
[root@laptop4 Net-MQTT-Simple-1.24]# rpm -qa | grep sdr
now trying to receive my favourite FM station @91MHz:

rtl_fm -f 91000000 | aplay -f S16_LE -t raw -c 1

Found 1 device(s):
0: Realtek, RTL2838UHIDIR, SN: 00000001

Using device 0: Generic RTL2832U OEM
Detached kernel driver
Found Rafael Micro R820T tuner
Tuner gain set to automatic.
Tuned to 91252000 Hz.
Oversampling input by: 42x.
Oversampling output by: 1x.
Buffer size: 8.13ms
Exact sample rate is: 1008000.009613 Hz
Sampling at 1008000 S/s.
Output at 24000 Hz.
Playing raw data 'stdin' : Signed 16 bit Little Endian, Rate 8000 Hz, Mono

Hear only noise, but... freq is incorrect. What is going on, how to correct it?

rtlsdr_scan starts w/o problem, but how to interpret output?

Statistics: Posted by laurentp — Mon Mar 30, 2020 3:01 am

RTL-SDR Discussion • Noo Elec NESDR Mini RTL-SDR + Gnu Radio (Companion)

I just bought a NooElec NESDR Mini. I was hoping / planning to use it with Gnu Radio Companion.

Doing some searching, I did not see anyone specifically discussing this. Does anyone know if this is possible? Do I need to re-flash the NESDR or something?


Statistics: Posted by jrs — Mon Mar 30, 2020 12:16 am

User Projects • Re: OpenEar will be new software for listening to Voice and data of protocols(Tetra, DMR, MPT,…)

The Last openair.exe file in the x64 download dir has idp.ares.generic virus detected by my avast anti virus

Statistics: Posted by ronenp — Sun Mar 29, 2020 5:49 pm

RTL-SDR Discussion • Re: VLF kit for a newbie

What do you mean by VLF?
"HF Direct Sampling Mode - Listen to 500 kHz - 24 MHz with direct sampling."
500Khz is not what many call VLF...
You must find someone that knows the antenna or get a honest write-up, if it overloads then it will be useless.

Statistics: Posted by alanzfq — Sun Mar 29, 2020 4:22 pm

RTL-SDR Discussion • VLF kit for a newbie

Hi guys,
I am a totally newbie of this world and I am just immagining a point to begin!

So I am looking for a reasonably entry level (means cheap!) and already assembled kit for VLF

I've seen maybe this antenna to buy: ... SwT5tWJNzz

with this SDR dongle:

to use on GNU/Linux

What do you think?

What do I need more? Do you recommend other stuff?



Statistics: Posted by u2r0 — Sun Mar 29, 2020 3:27 pm

Troubleshooting Help • RTL-SDR destabilizes USB sound card?

Just got my RTL-SDR and installed the drivers and SDR# but found an annoying sound problem that kept cropping up after a few seconds to a minute of listening. It sound like the sound is breaking up, heavily distorted until the output from the sound card cuts off completely. It also affects sound from other applications should they be playing at the same time.

So far I've tried decreasing the gain and the sampling rate or whatever it's called with no apparent effect.

Like a lot of people I suspect I have too many USB devices hanging off my PC. I've recently moved to a USB sound card as well (Sound Blaster G6) plus I have a Røde NT USB microphone. Plus the usual stuff people also have, keyboard, mouse, pen digitizer, external hard drives, printer and so on.

Would a USB PCI-E expansion card solve my issues do you think as it would separate devices and if so do you have any recommendations for a USB card that performs well for this type of application?

Statistics: Posted by bjornhallberg — Sun Mar 29, 2020 6:09 am

KerberosSDR • Re: Setting up new Kerberos — feedback and problems

I am experiencing similar issues with a Rpi4 4GB. Been trying to get the calibration tests completed but the graphs continue to show a static display. Haven't tried just connecting to my Arrow Array yet, but also noticed another small problem. The Pi will not load if the KSDR is receiving power from an external source. If you boot the Pi and let it power the KSDR it will at least load and get the test from CLI.

Statistics: Posted by KD7CAO — Sun Mar 29, 2020 3:14 am

KerberosSDR • Re: New Antenna for Kerberos SDR

The antenna is awesome. Very excited to get out and start trying it out. Maybe even tomorrow. I have a much needed day off and since church is closed, I need a project to keep my mind off of the COVID work.

I went through and did a bunch of Pi4 updates today and I also received my last 6 foot BNC to SMA cable. Hopefully, I can make it all operational and do a little testing.

I still need to see if the Kerberos software version needs updating on the Pi. Clicking some options don't seem to be giving me any response. However. Very excited about the antenna.

Tim has been outstanding to work with and helped design my weak idea into a revolutionary product. The pricing he is offering on his website is also far better than you could hope for.

Statistics: Posted by KD7CAO — Sun Mar 29, 2020 2:30 am

KerberosSDR • Re: New Antenna for Kerberos SDR

full tri-band would be awesome.

Statistics: Posted by auroran — Sat Mar 28, 2020 6:48 pm

Troubleshooting Help • Re: antenna field is blank

Just coming on here again to say I rebooted twice and it's working now!! I'm stunned. I have the whole FM spectrum and I can hear a whole range of stations and they are amazingly clear. Amazing!

Statistics: Posted by novice144 — Sat Mar 28, 2020 5:26 pm

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