Building up DG8SAQ VNWA

Beginning this week i received my DG8SAQ Vector Network Analyzer kit. I used some of the rare time this week to start the assembly of the kit. Until now i finished the assembly and testing of the power supply section and the both DDS sections. Mounting the DDS IC’s was a little bit difficult even with a stereo microscope and hot air station. The PCB i got was gold plated without tin. For the first DDS i tried to solder the pins first and then i tried to get the solder tin through the open vias at the bottomof the PCB to the¬† top side. My fear was that there might be no connection beween ground and the exposed pad of the DDS. So i removed the chip again. I saw that my fear was not confirmed. The exposed pad was clearly soldered before. Cleaning the pads and soldering the chip a second time was really tougth job …

Two sections of the circuits still to do. Lets see !

DG8SAQ VNWA partly assembled

DG8SAQ VNWA partly assembled