Antenna Selector Board

for Power Amplifiers and the DSP-7xx controller

Connecting more than one transceiver to antennas and power/swr meters leads to a terrible tangle of cables and connectors.
And if an additional amplifier is used the chaos in the shack is perfect.

To handle these problems two boards have been developed: the automatic input selector and the antenna output relais board.

This page describes the antenna relais board. The automatic input selector is described HERE.


This board is an add-on for the DSP-7 or DSP-7-PA controllers. It allows automatic antenna selection according to the used ham radio band.

A user menu allows to assign one (of three) antennas to a band. When a band is selected, either manually or via CAT (CI/V) interface then the antenna is automatically connected to the transceiver or amplifier.

Removing the need for cables and connectors is the highlight of this board: The antenna connectors (N or PL connectors) can be directly soldered to this board. No need for any cabling inside of the switch box or amplifier. See this video

User menu to assign antennas to bands:

ANT-1, 2 or 3 is selected, then bands are assigned to these antennas. There are many combinations of various bands avalable.




Circuit board:

two power relais (work up to 2,5 kWatts) can switch the transceiver or amplifier to up to three antennas. Antenna selection is automatic if the DSP-7xx controller is used.

The PL or N connector fit directly to this board. The PL or N connectors are mounted on the rear side of the device (as usual), then this board is soldered directly to the connectors. This eliminates the need of three coax lines. Just one cable goes to the transceiver, amplifier or (if more than on transceiver is used) to the automatic input selector board, as described HERE.

Design-Sample, stainless steel case built by DL1EV: