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Simple RF/Microwave Frequency Counter

Matjaz Vidmar, S53MV


5. Assembly

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.

pss

The 7805 regulator is bolted directly to the rear panel for heat-sinking.

pss

Two DPDT switches are used for front-end selection.

sw1

An additional switch is used to select the gate time.

sw2

All four printed-circuit boards are single-sided, etched on an 1.6mm-thick FR4 laminate (image resolution is 150dpi).

pcb

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.

box

The useful internal width is 200mm, depth 100mm and height 45mm.

top

The RF connectors, switches and LCD module are installed on the front panel.

front

The power-supply connector is installed on the rear panel.

rear





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