Monday, June 28, 2010

Field Day Operations from KB8RWQ working 1D ENY


Working 1d eny field day as kb8rwq using the portable station in psk31 mode.

Wednesday, June 16, 2010

Build a high resolution synthetic aperture radar (SAR) in your backyard


In these charts I show how to build a synthetic aperture radar (SAR) in your backyard.

There are many reasons to make your own SAR, including:
1. learn about radar imaging by actually doing it yourself
2. SAR image your car to learn why you were pulled over
3. measure the radar cross section of your favorite model airplane

The SAR presented here is based on the $240 rail SAR that i built in graduate school using parts from the Dayton Hamvention, a cordless drill, an old Genie garage door opener, shown here.

Enjoy, and let me know if you build a DIY synthetic aperture radar of your own :)

Friday, June 11, 2010

Submitted to Audio Express Magazine: DANGER POWER ON, A Vacuum Tube Home Theater System (2 part series))

For those interested in vacuum tube audio i have recently completed a 2 part article for Audio Express Magazine on my vacuum tube home theater system known as 'Frankenstein.'

In this two-part article the architecture will be discussed followed by the tube power amplifiers which were developed specifically for home theater applications, pushing the power as high as possible with readily available parts.

Shown here is the block diagram and call-outs for every component. Hopefully readers will find this work to be interesting and use it to develop their own vacuum tube home theater equipment.


Thursday, June 3, 2010

Interferometric Synthetic Aperture Microscopy Microscopic Laser Radar

If you are interested in Synthetic Aperture Radar (SAR) then you might want to check out this article in Optics and Photonics News (OPN) on interferometric synthetic aperture microscopy, which is actually a microscopic laser radar.

From article you will see how similar laser radar systems and microwave radar systems can be, and how powerful coherent imaging laser radar systems are for imaging in 3D of tissues for medical applications.