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 NumberDescriptionQTY
NodeMCU V2Microcontroller with ESP82661
N/A4 Channel Relay Module (Active Low)1
RM2055MHammond Enclosure (50 mm x 140 mm x 190 mm)1
HC-6Adhesive PCB Supports8
BK/HTB-24M-RFuse Holder 5mm x 20mm1
5MF 300-RFuse 300 mA 5mm x 20mm10
N/ADC Connector of your choice1
N/APanel Mount Micro USB Extension1
PGSD-8Cable Grommet1
N/AHookup WireLots
N/ADupont Jumpers WiresLots

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?