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1.0 MOUNTING CONSIDERATIONS
To insure long life and optimum performance, pay careful attention to mounting and wiring. This
unit has rubber feet for use where movement is not a problem.
Warning, never install this unit in areas where:
1.) ambient temperatures exceed 110 F (43°C)
2.) exposed to moisture, excessive dust, or dirt
3.) subjected to mechanical shock or vibration
1.1 COOLING AND TEMPERATURE
Reduced operating temperatures almost always extend the life of electronic components.
If the heatsink becomes uncomfortable to touch, the amplifier may require additional cooling.
Heatsink temperatures above 140°F indicate the need for additional cooling, such as re-mounting
the amplifier in a cooler location or the addition of a small fan blowing on the heatsink.
The
general guideline is to watch the heatsink temperature, and improve cooling or reduce duty cycle
if the heatsink is uncomfortable to touch.
Note:
As temperature in the mounting area increases, especially if air is not moving, cooling
becomes
less effective and the amplifier will "run hotter'.
If cooling is a problem, the
largest change will come from forcing air over the heatsink with a small fan.
The heatsink in this amplifier is sized for ICAS operation at 160 watts carrier output with a 33%
long-term duty cycle.
Do not exceed 5 minutes total accumulated transmitting time without ten
minutes of total accumulated resting time. This is a rough guideline; actual duty-cycle limitations
depend on many factors.
If possible, especially if cooling might be marginal and there is no external air blowing across the
heatsink, mount the amplifier with heatsink fins vertical.
This allows natural convection to
circulate air.
1.2 POWER WIRING
This amplifier has two main power leads. The red lead connects to the floating (not grounded)
positive 12-15 Vdc battery or power supply terminal.
The black lead is the negative lead. It is
grounded inside the amplifier, and is common with the metal case and all connector grounds.
To reduce fire hazards or the chance of equipment damage, the red lead must always be fused
with a 30-ampere fuse at the battery.
Some power supplies have internal current protection.
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