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"Instruments & Systems for Weather & Water Monitoring; weather stations, wind alarms, sensors for wind speed, wind direction, precipitation, temperature, relative humidity, barometric pressure, solar radiation, evaporation, rain & snow gauges, lightning detection."

Electronic keyer by pressure sensor. SEN-09673 is used for detecting touch.

This article reviews a custom-built, pressure-sensor-based CW paddle, designed by VK3IL, as an alternative to the stock _Elecraft KXPD2_ for the _Elecraft KX2_ transceiver. The author, VK3PF, describes recurring issues with the mechanical KXPD2, including intermittent operation and loosening screws, which prompted the search for a more reliable solution. The pressure-sensitive paddle utilizes a PCB and components provided by VK3IL, requiring surface-mount device (SMD) soldering for assembly. The physical housing for the paddle is a DIY "sandwich" construction, employing two pieces of closed-cell foam around the PCB, secured with heat-shrink tubing. This design allows for comfortable, single-handed operation, particularly beneficial for portable activations like Summits On The Air (SOTA). The paddle connects to the KX2 via a 3.5 mm stereo plug, and its operation involves squeezing the foam-encased assembly to generate dits and dahs. The successful implementation has led to the complete replacement of the original Elecraft paddle.

The Pressure Paddle V2.0 simplifies the original 2019 design by using MOSFETs’ unique properties for reliable, minimalistic switching. When pressure sensors detect a press, they reduce resistance, activating the MOSFET and lowering voltage until it stabilizes at the MOSFET’s threshold. This ensures consistent “key down” signals for the transceiver. Compatible with 3-5V logic systems, the circuit operates independently of pull-up resistor size. The PCB is lightweight, easy to assemble, and can be packaged in heat shrink or mounted. This version maintains durability with fewer components and flexible packaging options.