Tuesday, November 24, 2015

Introduction to Crossband Repeaters

One of the simplest types of duplex repeaters is the crossband or XBand repeater. This video discuses why crossband repeaters are so much cheaper than conventional repeaters, and lists many of the possible applications for XBand repeaters.


Wednesday, November 4, 2015

What Circulators Do In Repeaters

Here's the fourth video in my lecture series on FM voice repeaters. I've recently gotten a contract to design and build a cross-band repeater using a RICK and a pair of Kenwood radios, so this lecture series will possibly keep going. Enjoy.


Saturday, October 31, 2015

What Duplexers Do In Repeaters

Here's the third video in my lecture series on FM voice repeaters. Enjoy.


One of my good friends, Marcel, recently gave a talk at Pacificon on how to tune duplexers. Apologies on the poor audio quality; the acoustics in the room were terrible.


Wednesday, October 28, 2015

Whitepaper on Soldering Aluminum

I was recently cleaning out some of my old papers, and found a whitepaper written by my grandfather on soldering aluminum. Link here.

Walter worked as a metallurgist for Kaiser Aluminum in their bonding department developing joining processes with aluminum.  One of his most visible accomplishments can be easily seen if you live in the SF bay area; he developed the welding process for the steel/aluminum third rail on the BART system.

Monday, October 5, 2015

Lectures on Radio Repeaters

After having someone at a BBQ ask me to explain what a repeater is for about the 30th time in my life, I decided that I may as well record my standard 10 minute talk on what a repeater does.

Introduction to Radio Repeaters:

Of course, once I've got the camera turned on, why not record another 20 minutes on the internals of a repeater?

Internals of a Repeater:

I suspect there are a few more videos in this series, which I'm currently working on and will record time-permitting.