Solar CDX

JackYack Rev A

The Version A circuit laid out in Eagle CAD. Top of board view.

Back in October, I mentioned an open source keyer developed for the ATTINY 45 and requiring only a few components. The source code for the controller and an example schematic were uploaded to a repository. Subsequently, I decided to try my [...]

A loading coil for 80m

As the days grow shorter with the approach of winter and activity shifts towards longer wavelengths, I took stock of my log and noticed that while I have racked up a reasonable number of contacts on 15, 20 and 40 meters, 80 meters lags far behind. I anticipate moving overseas in about six months, but [...]

A tiny and open source CW keyer

While working on a new project, I had a choice of either plugging in the output of a free-standing CW keyer or embedding one into the project. I decided to go with the embedded keyer, but then had to either find or write one. K3NG has written a top-notch keyer based on the arduino platform. [...]

The Crossed Bananas Display

Arguably, the crossed bananas display (CBD) was not the next most needed accessory in my shack. I mean, who needs a crossed bananas display, anyhow? Nonetheless, I built one, and it seems to be working.

The CBD is a tuning aid for frequency-shift keyed modes. At one time, these displays were particularly in vogue among [...]

Burning ATmega328 bootloaders

I followed the instructions to set up a breadboard as a platform to burn bootloaders onto some factory-fresh ATmega328 chips, according to instructions. Specifically, I set up the breadboard with a 16Mhz crystal rather than using the chip’s onboard clock.

I uploaded the ArduinoISP sketch my Duemilanove, made all the right cross connections to the [...]

Panel mounting power pole connectors

I am strongly in favor of having a standard connector for powering everything in the shack, not only for the sake of EMCOMM deployment, but also to avoid having a rat’s nest of proprietary connectors strewn behind the operating desk. Consequently, whenever I build something, I include power pole connectors (see, for example, the [...]

The Business End of the RBN

I had two projects this weekend, one involving microwave and the other involving HF. The microwave project is now firmly attached to the kitchen cabinet and works fine at reheating pizzas. The HF project took more doing. My goal was to set up my Softrock Lite II as a 30m reporting station for the reverse [...]

PK232 Reborn

Last month, Hank (K1DOS) came over and demonstrated how he could send and receive mail through an FM packet connect from his car using a computer and a little TNC. I agreed it was pretty cool, and he pointed out that I could do much the same the the PK232 gathering dust on a [...]

Guitar Center

An observation: when it comes to audio connectors, people who need their connectors to work when they are running back and forth on a stage under hot lights and yanking their equipment around by the wiring — these are the people most likely to have evolved sturdy connectors.

The photo at right shows three quarter-inch [...]

SCAF audio filter build

I have a few CW rigs that have lousy filtering. Rockmites and other low part count direct conversion rigs naturally don’t have much in the way of selectivity, but this is also (unfortunately) true of my unmodified Yaesu FT-817nd. I should probably invest in the an IF filter for the 817, but for other rigs, [...]