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© 2018 – DL4ZAO – Status: Preliminary v010
Seite 6
Mounting of the pcb in the aluminum box
Note: The SO259 bulkhead socket „TO ANTENNA“ and the RCA Phono Plug “REMOTE OFF” must be
mounted completely isolated against the metal box. For this purpose a specific set of isolation washer
and busher is needed.
Resistor R4 (1MΩ/1KV) is optional and no part of the bill of material. If necessary, it may retrofitted in
order to discharge static electricity from wire antennas. The resistor must be able to handle high
voltages (>1kV).
First step is to mount the fitted printed circuit board into the previously drilled aluminum enclosure and
fix it with two 2mm/AWG #16 bolts and nuts. Use two 6mm (3/16 inch) long metallic spacer sleeves
suited for the screws to provide sufficient clearance between pcb and the bottom of the metal box. The
nuts and bolt connection builds the main conductive path between the ground layer of the printed
circuit board and the grounded aluminum case.
Wiring of the connectors
To wire the rf-connectors to the corresponding pads on the pcb use bare or silver plated copper wire
with a diameter of 1,4mm (AWG #16).
The „TO RADIO“ rf-socket must
completely be isolated against the metal
box. Use the isolation washers and the
soldering tag to assemble the bulkhead
connector in the box. Wire and solder the
soldering tag of the outer conductor with
the corresponding pad K2 on the pcb
(yellow arrow).
Next step: wire and solder the core
conductor with K1 (red arrow). Put the
