QEX

2001

• More on atmospheric ozone and low-frequency propagation
• Reducing IMD in high-level mixers
• Plate characteristics of a distortion free class-AB RF-amplifier tube
• 160 meter propagation: unpredictable aspects
• The art of making and measuring LF coils
• The Q of single layer air core coils: A mathematical analysis

2002

• Quarz crystal parameter measurments
• Improved dynamic range testing
• Understanding switching power supplies, part 1

2003

• Understanding switching power supplies, part 2
• A high level accessory front end for the HF amateur bands

2004

• Accurate measurment of small inductances

2006

• The LP-100 Wattmeter