Andras, HA7ILM's blog

How to use GNU Radio gr-osmosdr block on a VM

First question: why would anyone want to set up GNU Radio on a virtual machine?
Because you can connect to an rtl_tcp server to get I/Q samples from there, and do actual processing on the VM.

The problem came when running a GRC flowgraph which contains a gr-osmosdr block has failed with a mysterious-looking segmentation fault.

Use of Message Sink in GNU Radio Companion

I've implemented a power spectrum display to demonstrate a way to postprocess the data gathered from GNU Radio in python. Source code can be downloaded.

A 7805 and two flat batteries

You're now watching our Creative Cable Connection Series #1.
This is what to do when you have two batteries gone flat, and want to power a panel that has voltage regulation:

Yes, it's quite funny, anyway, I could make the circuit work for three more minutes :-)

Possible use of RTL-SDR for amateur radiolocation

Having watched Balint Seeber's SDRDF presentation, I and HA1OP had some interesting ideas.

LabVIEW and RTL-SDR interface

I've made an interface between the popular RTL-SDR compatible hardware and NI LabVIEW. It's not complete, but just got it working. It's a set of SubVIs that can be used to connect to an rtl_tcp server. I've also implemented a WFM demodulator, so I could listen to some FM broadcast in LabVIEW.

Checking out Raspberry Pi network speed

I've just installed a tool called iperf, that can actually determine the real available network bandwith between two nodes in your network.
The result listed below might not be the most accurate, as I was connected to the Pi with a Linksys 8 port switch in between.

Weak Signal Propagation Reporter tests

I've recently made some experiments with the great WSPR software, which can dig out and process so weak signals that you can't even hear. Along with the software, there's a great web interface on which you can see the contacts on a map.

The software receives and transmits automatically, just don't forget to synchronize your clock and uncheck the IDLE box.

Solved problem with headphone jack under Linux

My laptop, which has Linux installed, started to miss changing the sound output from the speakers to headphones when I plugged in an audio jack. (I still can't decide whether it's caused by Wine pulseaudio bug or hibernation.) It was annoying, because I had to reboot the machine to make headphones work again.

My configuration: Debian Unstable and laptop with Intel High Definition sound card, Pulseaudio using ALSA sink as output.

I could figure out how to solve it without rebooting:

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