VHF Multi-Beaming Switch
The purpose if this box is to
distribute power from the VHF transceiver to the first PA, second
PA, or both through a power-splitter.
All the logic is controlled by Arduino Nano.
You can toggle between two modes: single-beaming and
multi-beaming.
In the single-beaming mode you select whether you receive from
ANT-A or ANT-B. When you transmit then only the selected PA and
the selected ANT is in use. This will be mainly used if you do
Search & Pounce.
In the multi-beaming mode you select from which ANT you receive,
or both. When you transmit then always both PAs and both ANTs are
in use. This is used when you do CQ.
PTT of an unused PA is not triggered while transmitting.
The driving power of the unused branch is burned in non-inductive
rezistor 50 Ohm. This way you can freely and quickly select the
configuration you need without adjusting the driving power.
If the device is unpowered the RF path and the PTT line is routed
to PA-A which considered to be "main" one. In this case
half of the driving power is not burned in the rezistor.
 The whole device ready to use. |
 Top cover removed. |
 The front panel. |
 The rear panel. |
Schematics
Control board (Arduino)
Relay board