With a sequence controller, this trouble can be avoided. The sequence controller provides a control signal for the coaxial relay and it switches the voltage supply for the power amplifier. There is a time delay between the two signals to guarantee safe switching.
Technical specifications
Supply voltage | +12 ... 15 V DC |
Control Output PA | max. 1 A |
Control output for antenna relay | max. 1 A (switched to GND) |
Switching delay | typ. 100 ... 150 ms |
Description
Many coaxial relays have a too low isolation between the ports during the change-over. If the power amplifier (in a transmit-receive system) is switched too early, this may lead to damage or destruction of the input transistor in the preamplifier or converter.With a sequence controller, this trouble can be avoided. The sequence controller provides a control signal for the coaxial relay and it switches the voltage supply for the power amplifier. There is a time delay between the two signals to guarantee safe switching.
Applications
- Control circuit for transmit-receive systems which use power amplifiers and coaxial relays
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