Finding an enclosure for the RF-IV sensor turned out to be a real challenge. As I mentioned before, because of the size and connector locati...

The VNA software can control different accessories - like the S-Parameter setup or the RF-IV sensor. This means that some extra control sig...

I am pretty happy with the Parallel port interface - it doesn't require any drivers and works just fine. For portable applications using...

I've completed the PCB for the RF-IV sensor. Now I have to come up with an enclosure. In addition, I have to install a mini-DIN connecto...

I posted a number of plots of my SteppIR BigIR Mrk III /w 80m coil on my antenna site. All plots were generated with the myVNA software....

I love my new toy! It is so nice to be able to perform all kinds of measurements and tests without begging "that guy with the HP VNA ...

Proper calibration is absolutely essential for high accuracy measurements. Here are some notes on the calibration standards for the N2PK VNA...

Quick sweep (3 to 29 MHz ) of my G5RV clearly shows the low SWR points. It also reminds me that I need to do some minor tuneup of the ante...

Finally, about two months after I started working on it (with the "partial support" of my patient wife :) - the finished VNA is wa...

I fabricated the custom DDS ICs heatsink out of a used old Pentium CPU heatsink (the green heatsink on the picture). Using a Dremel tool,...

I mounted the power supply module onto a piece of double-sided FR4 board. The board is exactly the same width as the main VNA PCB and just ...

The reflection bridge was fairly easy to build. Most of the work was mechanical. The two male bulkhead BNC were very difficult thing to fi...

Cutting out the rectangular openings for the switch and the DB25 connector was the real challenge here. The left side of the panel is dedica...

I received the PCBs for the PS board from the board fab house (Sunstone circuits) and I must say that the fabrication quality is pretty good...