Siglent SDG800 Function Generator

I’ve been researching test gear, and it is actually more for my education than anything. For pure digital circuits, the Salaea Logic Analyzer is a good choice, and while I understand it can handle some analog signals, this is where a function generator and oscilloscope comes in. At Circuitlab.com, I can draw a schematic diagram and simulate what it would look like in an…

First Stop on the u.RAT World Tour: EBARC in El Sobrante

I will be giving my first Maker – Ham presentation at the EBARC meeting this Friday: 7:30pm, Friday, August 11th, at the El Sobrante Library on Appian Way This will be my “warm up” for Pacificon, and several Diablo DXers will be on hand    

ARRL Guide to Antenna Tuners

This is a decent book which covers all of the different kinds of commercial – and a few home brewed antenna tuners (couplers). It is a high level book and offers  practical explanation of why you might choose one model over another and also whether or not you would use an internal or external or tuner in the shack or out at the antenna….

U.RAT Ready for World Domination!

The final part of this u.RAT “science fair project” is wiring the variable capacitor and roller inductor with a 50 ohm dummy load resistor and then attaching the Rig Experts AA-30 so we can see how tuning the components affects SWR and what the L, C and X values are. I have been playing with different “equivalent circuits” and using a 56 ohm as…

The IMSAI 8080, Ham Radio and Me

It was 1976, I was newly minted WA2QHN (after passing my General Class Ham Radio test on vacation in Seattle at their FCC Office), and I thought I wanted to be an Electronic Engineer. It all started in Ms. Goodin’s 4th grade class when she taught a series on “The Inventors”. I wanted to be an inventor at age 9 or 10. At age…

The u.RAT as an Educational Platform

What started out as a personal project – to use the Elecraft KPOD to control the Palstar BT-1500A, has turned into an educational platform that I can use to write articles and give presentations at Makers Meetups and Ham Radio Club and convention gatherings. I’m giving my first urat presentation at EBARC in San Pablo in just two weeks –  August 11. EBARC has…

U.RAT Video Wrap Up

Here is the full on video for the u.RAT:

The u.rat world tour: First stop – EBARC

On Friday, August 11, I will kick off the first stop on the 2017 u.RAT World Tour at the East Bay Amateur Radio Club (EBARC): http://www.ebarc.org/events.htm The second stop on this World Tour will be Pacificon – Saturday morning (I’m waiting on the time slot at this point): http://pacificon.org/ You will notice that the Pacificon web site still points to last years event, so…

A Funny Thing Happened on the Way to the U.RAT . . .

OK, so that’s a bit dramatic – but I’ll be busy first wrapping up the final “packaging” of the u.RAT Demonstration Board, and then writing articles and presentations. I will submit the article to QST with the main theme one that I will repeat at EBARC and Pacificon – which is that the “Maker – Ham” connection is a real force to be reckoned…

U.RAT Roller Inductor Stop Warning

A micro switch turns on when you are tuning at the end of the roller inductor. Very easy to implement, and it did not require any code changes – just old school wire tie, two part epoxy and a LED. I will put the Raspberry Pi W and voltage control on this polycarbonite project case. OK – now I really am done with all…