You may have noticed the weird construction I used in the SSB/CW receiver V0.7 implemented in the GNU Radio companion. It was using three AGC2 blocks with different decay rates, running in parallel and selecting one of them using a selector. The reason why I didn’t just use one block and set the decay rate of the block using an option menu or a slider was that this method didn’t work! Today I decided to dig deeper into the code and see how to fix this.
CW
GNU Radio SSB/CW/AM/FM Receiver v0.6
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
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.
From double side band to single side band reception
When I presented the Simple CW Receiver few weeks ago I also mentioned and demonstrated that it is actually a double side band receiver (it’s around 2:35 in the video). This is good for AM and FM, but can be very inconvenient for receiving CW and SSB (single side band). If the station we are trying to receive is surrounded by other stations on the neighbouring channels, these will interfere via the opposite side band. Therefore, it was time to look into single side band reception.
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.