New update of the simple receiver – version 0.6 – with the following changes:
- Added frequency entry widget to change USRP frequency
- Also created AM and narrow FM versions
receiver
Binaural CW Receiver with GNU Radio and USRP
Today I felt like doing an experiment that is not quite on my TODO list – a binaural CW receiver. A binaural CW receiver is a receiver that gives a spatial feeling while you are tuning. As I understand it, you have to use stereo where the signals move from one side to the other as you tune and are in the middle when you are tuned to the frequency.
Simple SSB Receiver in GNU Radio Companion
The simple SSB software defined radio receiver is now functional!
Few days ago I wrote about how to upgrade the simple double side band receiver to single side band. The modification was supposed to be very simple and involved changing the band pass filter from using real taps to use complex taps. The upgrade wasn’t quite as easy, though.
WBX receiver sensitivity in CW
After finishing the initial “smoke tests” on the 5.6-5.9 GHz receiver setup – in particular the KU LNC 5659 C PRO down converter, we decided to measure the sensitivity of the WBX receiver over the whole range. We define sensitivity in this respect as the weakest CW signal that: Gives an SNR of at least … Read more
Simple CW Receiver V0.3
Just a quick note before I’m leaving to OZ7SAT for the smoke tests of the KU LNC 5659 C PRO low noise down converter – attached to the USRP+WBX. I had some time to improve on the simple CW receiver by adding the frequency translating filter to allow easy tuning within the sampled spectrum. This … Read more
OZ7IGY beacon with GNU Radio, USRP and WBX
I was playing with GNU Radio, the USRP and the WBX daughterboard tonight preparing for the tests of the 5.7/5.8 GHz receiver setup tomorrow. For some reason that I can not remember, I have decided to tune in to 432.471 MHz – the UHF frequency of the OZ7IGY beacon, which is located approximately 50 km … Read more
Simple CW Receiver with GNU Radio
I have been playing with GNU Radio and GRC (GNU Radio Companion) over the weekend and I ended up implementing a very simple CW receiver. This will be very handy on Tuesday when we will be testing the 5.8 GHz UNITEC-1 setup for the first time using the OZ7IGY beacon on 5.76093 GHz. Here is a quick video demo of the receiver where I use my Yaesu FT-817ND to transmit a test signal.
Bias-T for the UNITEC-1 Receiver
Today I have been looking at the options for bias tees that we can use for the UNITEC-1 receiver. A bias tee (aka. Bias -T) is a simple device that can inject DC voltage into a coax cable. It is often used to provide supply voltage to devices that are mounted on the antenna without … Read more
WBX receiver test on the air: Copenhagen VOLMET
I have been quite busy during the last weeks doing overtime at work, nonetheless, I have managed to carry out some small on the air tests of my newly acquired WBX transceiver boards for the USRP and GNU Radio. Tonight, I tuned in to Copenhagen VOLMET that transmits AM on 127.000 MHz.
Quick check of the WBX receiver
I had a few hours to spare tonight and I decided to do a quick check of the WBX receiver. Didn’t have time for much so I just compared it to the TVRX tuner using a strong FM broadcast station. The software was a simple WFM receiver constructed in the GNU Radio Companion graphical editor. … Read more