There are small basic controller boards that you might find helpful for
dealing with several issues.

Other issues to consider:

Think about a full time fan trained right on the PA and power supply and
program TOT to 4 min max. in the FT.
Even then you may find your mobile getting way too hot even on the low power
settings. Even to the point of melting solder. The heat may not travel
fast enough from the device into the heat sink and build up when higher
power levels are selected. This winds up heating up the board too much
Also note the transmitter is spec'd at a drifty 10ppm.

Possible RF energy from the transmitter getting into the RX audio and thus
into the TX audio.

Hams actually put more stress on a repeater than commercial users.

http://infotech.awardspace.com/