This is an updated version of the W7ZOI/K7TAU S.A. replacing the vco with a si570 and the control and Scope interface replaced with an Arduino and a serial interface to a PC. There is a corresponding piece of software on the PC that send control information to the S.A and receives and displays the acquired data.
I decided to build a stand alone S.A. based on this design. I had been playing with different TFT displays for use in expanding the SNA Jr. The one I liked most was a 3.2" 320x480 display, it is a nice large display that is designed for use with an Arduino Mega.
Using the Mega, it has a 16 bit parallel interface which is much faster than SPI that the others I had tried used. I modified the design I had for a interface board to give the needed control and data lines needed for the S.A., also included some others for possible use in other projects.
|Spectrum Analyzer Arduino Interface board|
This made layout easier than I thought it would be. and the board a little smaller. I did up a quick sketch to test the board with the appropriate drivers, and was pleased with the result. Display is nice and large, and has more than adequate resolution for what I want to do. Since the driver graphic primitives are different and more limited than the ones I had used in the SNA jr. it is taking a while to port the software over to the new hardware.
Since I already have the SNA jr and the Chinese SNA I can get to working on some of the S.A. boards. The first board, was one I had already started on for expanding the SNA jr. This was a detector board based on the ad8307, and is nearly the same as the W7ZOI board used in the PHSNA. Only change is that I had a bunch of 7805 regulators on hand and used that instead of a 78L05 , and used a buffer amplifier on the interface board. Later added a shield made from thin double sided PCB material around the detector part of the board.
Now to lay out and build some of the other S.A. boards.