Simple RF/Microwave Frequency Counter
Matjaz Vidmar, S53MV
All counter modules require a +5V power supply. A 7805 regulator is a simple and efficient solution. Some additional components are required for interference and switching-transient suppression.
The 7805 regulator is bolted directly to the rear panel for heat-sinking.
Two DPDT switches are used for front-end selection.
An additional switch is used to select the gate time.
All four printed-circuit boards are single-sided, etched on an 1.6mm-thick FR4 laminate (image resolution is 150dpi).
The counter is installed in a box made of aluminum sheet. The bottom is made from 1mm-thick aluminum sheet, the cover is made from 0.6mm-thick aluminum sheet and the LCD is protected by a small piece of plexiglass.
The useful internal width is 200mm, depth 100mm and height 45mm.
The RF connectors, switches and LCD module are installed on the front panel.
The power-supply connector is installed on the rear panel.
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