Antenna switch overview
Every shack eventually grows with more antennas than transceivers. Switching multiple antennas to a single transceivers requires some hardware. Especially when you want to do it automatically depending on the band the transceiver is operating on or from a PC. I developed some boards that help in this case:
- Controller (available as a kit) - placed in the shack, can work with any relay board that has positive common supply to all relay coils
- Relay board - can be placed in the shack but also outdoors to minimize the total coax length
- Rooftop option board (reduces the amount of wiring that has to go to the roof) - placed next to the relay board
There are various ways the controller can work with the relays.
The controller is placed in the shack. It works with any relay board that has up to 7 relays and relay coils share a positive common wire. Besides coaxes there is a need for a control cable with N+1 wires (where N is the number of relays).
It will not work when the relay coils have a common ground. Example:[RemoteQTH six to one switch]
This architecture uses my relay board. It can switch up to 4 antennas.
This architecture uses my relay board with the rooftop option module. It can switch up to 4 antennas. Only 3 wires are needed to control the relays. The rooftop option can be useful when you have a single 8-conductor Cat5e Ethernet cable going up the roof and need more spare wires to control other equipment.