A lot of magazines and articles have already covered the principles of software-defined radio. Most of them contain mathematical equations which require a greater level of math. Certainly, without math, there would be no SDR, but I believe, that the concept of SDR can also be explained without. Let me show you the SDR concept from a different point of view!
In the third article, we will have a deeper look into the TX path of the FA-SDR-TRX. All components will be discussed, including the optional 1 Watt amplifier.
After a systems view on the FA-SDR-TRX, it’s time to go into more detail. This post is dedicated to FA-SDR-TRX’s receiver.
The FA-SDR-TRX is an all-band low-cost software defined radio. The FA-SDR-TRX was created by Harald DL2EWN and described in an article series in the German Ham Radio Magazine Funkamateur. After the big success of the single band kits like Softrock, SDR4080, or Genesis, the FA-SDR-TRX is the next step in the evolution of SDR kits. Thanks to the support of Harald I’m able to provide a detailed description of the concept behind FA-SDR-TRX.
In this article, we will investigate how various Contest programs (Win-Test, N1MM, and CW-Skimmer) communicate with the FT1000MP shortwave transceiver over the serial port. We will see what happens when multiple programs try to talk to the transceiver at the same time, what problems appear and how we can successfully monitor and debug them.
Today, I could measure the performance of the well-known ICE bandpass filters. Read more about the measurement results.
Lately, I needed a 3dB splitter for an HF (1…30MHz) measurement project. Instead of buying myself a splitter, I decided to build it on my own. After measuring the performance I am satisfied with the result.
