The DSP-7 board can be used as a controller for amateur radio amplifiers (lowband, shortwave, VHF / UHF / SHF) and also as a display for power / SWR meters (simultaneous single, dual or triple SWR bridge).
This description focuses on the DSP7-7-PA, which is used as a power amplifier controller. It supports most home-built amplifiers, making it a professional product that outperforms most commercial power amplifiers in functionality and safety.
Input and output switches are optional, but extremely convenient as they switch in a completely automated fashion.
At the input, a coupler monitors the input power; if it is too high (transceiver accidentally set to full 100W), the output stage is switched off. A second coupler monitors the impedance between the power amplifier and the low pass filter. If this is too high (e.g. wrong filter) the output stage is switched off. The third coupler measures output power and antenna SWR.
The filter bank with low pass filters is switched automatically, depending on the selected band. With CAT interface the band is read out from the transceiver.
Furthermore DSP-7-PA monitors the power supply and the temperature to switch off in case of error.