I wanted to build a fully remotable LZ1AQ Active Antenna controller with off the shelf components. It is very cheap to buy ESP8266 MCUs and multi-channel relay boards online. Why reinvent the wheel? This project can be easily adapted to control remote antenna switches and other devices that can be controlled with relays.

Download on GitHub

Schematic

BOM

Part Number Description QTY
NodeMCU V2 Microcontroller with ESP8266 1
N/A 4 Channel Relay Module (Active Low) 1
RM2055M Hammond Enclosure (50 mm x 140 mm x 190 mm) 1
HC-6 Adhesive PCB Supports 8
BK/HTB-24M-R Fuse Holder 5mm x 20mm 1
5MF 300-R Fuse 300 mA 5mm x 20mm 10
N/A DC Connector of your choice 1
N/A Panel Mount Micro USB Extension 1
PGSD-8 Cable Grommet 1
N/A Hookup Wire Lots
N/A Dupont Jumpers Wires Lots

I used PC Motherboard standoffs and screws to rest the power inserter in the enclosure. It is not mounted permanently to allow easy removal of the front panel.

LZ1AQ Documentation

1 0 0 Loop A
0 1 0 Loop B
1 1 0 A + B
0 0 1 Vertical

Note: My code has pin 1 inverted so Loop A is in the Normally Closed position. This allows the loop to function in A mode with no power applied to the MCU or relay board.

LZ1AQ FAQ: Can the antenna switching be performed digitally?