OZ9AEC

FM transmissions over FO-29 linear transponder

Monday, 07 May 2012 22:54 Alexandru Csete Space - Communications

I have previously written about interference from FM stations on the HO-68 linear transponder. Now it appears the other satellites with linear transponders also suffer from local FM traffic by people who haven't got a clue that they are transmitting in the satellite uplink segment of the 2 meter band.

Arduino controlled differential pan/tilt drive

Friday, 22 June 2012 23:00 Alexandru Csete Hardware Lab - Arduino

An Arduino Duemilanove controlling a differential azimuth/elevation drive. The stepper motor interface is two EasyDriver boards.

The Funcube Dongle Pro and Pro+ on the Raspberry Pi

Thursday, 29 November 2012 21:26 Alexandru Csete Radios - Funcube Dongle

Although I have had a Raspberry Pi rev B for several weeks now, it wasn't until last night that I got a chance to try it out. Since several people have reported failed attempts at getting the Funcube Dongle Pro and Pro+ play nicely with the Raspberry Pi, I decided to take it as far as I could in those few hours. The result is this very brief tech note about how to make the Funcube Dongle Pro and Pro+ work on the Raspberry Pi.

Hardware AGC in RTL-SDR devices

Friday, 07 September 2012 18:41 Alexandru Csete Radios - GNU Radio

I was testing the Gqrx FM stereo code by Alex Grinkov using an RTL-SDR dongle when I noticed that the recently added auto-gain in the driver can be quite useful.

RTL-SDR spectrum analyzer on the Beaglebone

Monday, 18 February 2013 20:36 Alexandru Csete Hardware Lab - Beaglebone

Take a Beaglebone, add an LCD cape and a £10 USB TV dongle, install librtlsdr and my rtlizer software and you have an awesome hand-held, real-time spectrum analyzer.