I have just come across a case where PA's were being blown when driven by a Lime Mini on a Portsdown transmitter at 23 cms
This one was the latest software and gave out a spike of signal a few MHz away from 1255MHz at about 1258MHz at 15dB more signal than the eventual DVB-S2 signal.
This got through the driver amp OK but blew the gate on the PA.
I ALWAYS use an SMA relay on the output of the Lime Mini to prevent this happening and I have 3 Portsdowns with lime minis all with relays.
The relay signal is obtained from the GPIO pcb and is used to drive a bipolar transistor switch (the 3volts is not enough to fully turn on a mosfet switch) to power the 28 volt relay.
The 28 volts is from an Ebay step up power supply just to run the relay.
I see the calibration can be turned off in the software but I don't 100% trust this!
A relay is a lot cheaper than a blown PA!
James Smith