Two years since I first published my SteppIr BigIR Mrk III dissection / review page , the web counter is at 10 000 visitors (only unique...

For lack of better words - the happiest day in my life ! Today, Jan 28, 2010 at 4:26 Eastern Time my first harmonic - Vichren Andrey-Endri S...

The idea about an "Indoor Sundial Clock" is not a new one. There are many patent applications filed over the years (some dating ba...

Today, I got the chance to personally meet and chat with the person who is responsible for my career as a computer engineer - the co-founder...

The RF-IV sensor is very useful for performing measurments of high-Q devices. To improve the accuracy of such measurments, an extra calibrat...

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...