Projects

Projects


KG6CYN Experimenters DDS VFO Built by KA8MAV Check out this new DDS VFO by Trevor, KG6CYN. It's based on the Analog Devices AD9850 DDS VFO chip and the AT89C52 microprocessor. (Note: This is a prototype. The microprocessor in the final version will be the AT89S8252.) Click here for details

RF Probe by N7TX Steve used a N-type male connector, minus the outer sheathing that connects the connector to the female side. Click here for details

KA8MAV RF Probe (Complete with schematic and building tips.) This is the RF Probe I built for the Elmer 101 (2001) Course. It's no secret I like to make things "tiny". As with most projects, I always have trouble finding just the right enclosure. This was no exception. I wanted something small, metal, and with a point on one end. I looked and looked... but couldn't find the "perfect" enclosure. While I was sitting at my desk thinking... and staring at my straight key... I saw something. There... right in front of me was the answer. An 1/8" Shielded Phono Plug! Click here for details

KA8MAV XTAL RF Probe I couldn't help myself. After building my other RF probe using a 1N34A diode which I also use in some of my Crystal Radios... I couldn't resist building an RF probe using a VINTAGE Italian Crystal Detector complete with a real chunk of galena and cats whisker. Click here for details

Cantenna Jr. - W4JBM This is just to show that not all projects have to be complicated to be fun. And after all, having fun is what the hobby is all about... W4JBM shows how to build a "Cantenna Jr." into a small metal tin using only a few resistors and a piece of PC board. Click here for details

Pixie 2 QRPp CW Transceiver - KA8MAV The Pixie 2 is a tiny HF CW transceiver, with a standard two transistor transmitter. It's a Colpitts oscillator, left running, and a keyed power amplifier. There is no external mixer used to feed the audio amplifier. Instead, the mixing is done at the final amplifier itself with the resulting audio taken off the emitter. Click here for details	Pixie2 QRPp HF CW Transceiver Kit

Permeability Tuned Oscillator (PTO) - WA6OTP This Permeability Tuned Oscillator Kit gives flexibility to your radio projects. It will tune over a wide range 500 kc +. About 13 kc per revolution of the tuning dial. You can add this to your simple transmitter or direct conversion receiver and not be rock bound. Click here for details	Permeability Tuned Oscillator (PTO) Kit by WA6OTP

"The >L< Network Revisited" - N3AAZ What do these terms have in common? QRP, backpacking, efficiency, zero-weight feedline, low pass filter, stealth, home brew, omni-directional, all band, tuner, and... Answer... One inductor and one capacitor, the >L< Network. Click here for details	>L< Network Coil

The WA1FFL direct-digital VFO This DDS VFO is based on the Analog Devices AD9835 DDS chip. There was an article about this kit in the January 2002 issue of QST Magazine. I decided to do without the microprocessor that comes with the kit so I could experiment with the AD9835. I'm planning on initially using my PC's parallel port to control the DDS. More details coming soon.	WA1FFL direct-digital VFO

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