The ARRL Experimenters Exchange

By now, packeteer is a household word, but what is GaAs Valley The electronics trade journals are predicting that Silicon Valley will become GaAs Valley any day now. It's nice to be out in front of the pack on technological change, so let's assume that the name change occurs before March 30. That is the date for the Fourth ARRL Amateur Radio Computer Networking Conference being held in Moscone Convention Center, in downtown San Francisco. The Conference is co-sponsored by the ARRL and the...

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Circuit for a Very Stable Crystal Oscillator I am building a high accuracy 5.00-MHz crystal oscillator. It will be temperature compensated, temperature controlled to within 0.1 C, and will use a selected temperature at a point on the frequency-temperature curve that is relatively flat in the vicinity of 40 to 50 C. The oscillator will be powered by a well regulated supply, backed up by Nicads to eliminate outage if a power failure should occur. The unit is encapsulated in about lCr cubed...

Qex

Correspondence continued from page 2. Power Supply Schematic Regarding your power supply schematic in the January 1985 QEX p. 11 , the basic idea will definitely work if the transformers are of similar construction. If they are different, their internal impedances could be quite different, even if the voltage and current ratings are the same. This would make it more difficult to get a current balance, but don't hesitate to give it a try. The Variac is actually an autotransformer and must be...