Friday, August 24, 2018

Effective YouTube Videos

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I don't consider myself an expert by any means, but after making over 100 YouTube videos I can think of a few tips that will help improv...
Thursday, August 23, 2018

The Octopus Curve Tracer

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I recently put together an interesting little piece of test equipment. It is a simple curve tracer, sometimes called a V/I curve tracer o...
7 comments:
Saturday, April 14, 2018

Rebuilding The Heathit AT-1 Transmitter - Testing and Wrapup

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I did further testing of the restored unit, measuring voltages against the manual, and they all looked okay. The unit was speced at op...
1 comment:
Wednesday, April 11, 2018

Rebuilding The Heathit AT-1 Transmitter - It's Alive!

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Initial powerup tests are good and indicate that it is producing output on all four bands. I powered is up slowly with a Variac and the...
Tuesday, April 10, 2018

Rebuilding The Heathit AT-1 Transmitter - Coil Wiring

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The last stage of assembly is the wiring of the oscillator and bandswitch coils on the top of the chassis. Most of this is done with h...
Monday, April 9, 2018

Rebuilding The Heathit AT-1 Transmitter - Final Amplifier Tube Wiring

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I finished up the next set of assembly instructions  - the wiring around the final amplifier tube. The last toroid is another large one...
Sunday, April 8, 2018

Rebuilding The Heathit AT-1 Transmitter - Oscillator Stage

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I completed the wiring of the oscillator stage. The two RF chokes were replaced with toroids. Once is larger, so I mounted it against the ch...