Wiring; Fm, Cw And Non-Linear Modes; Drive Power; Duty Cycle Cw And Fm - Mirage B 1018 G User Manual

off when the RELAY line is pulled low (grounded). If the POWER switch is on, the internal
transmitting relays will switch to the transmit mode.

2.4 WIRING

The exciter can be connected to the amplifier with any type of good quality 50-ohm coaxial cable.
Length and cable size is not important, except as it might add signal loss if the cable is extremely
long.

3.0 FM, CW AND NON-LINEAR MODES

Good linearity is the faithful reproduction o f input power level changes by the output power of
the amplifier.
Some modulation methods or operating modes do not depend on distortion-free amplitude
changes for transferring information. Non-linear modes include CW, FM, and FSK. The
amplifier can "gain compress" or "flat-top" without changing signal quality or bandwidth,
because the RF is either on or off.
This allows the amplifier to be driven to higher output levels with no detectable change in signal
bandwidth.

3.1 DRIVE POWER

Drive power on FM, CW, or FSK is limited by power ratings of transistors and heatsink
temperature. The transistor is safely able to accept 12 watts of drive, which corresponds to
approximately 160 watts carrier output.
Do not trust unknown or questionable accuracy meters! Some meters are off by
as much as 50% or more!
3.2 DUTY-CYCLE CW AND FM
The duty-cycle is set by ambient temperature, mounting position, operating power, and airflow.
Temperature and mounting concerns are detailed in section 1.0. Driving-power concerns are
detailed in section 2.0
The maximum amplifier output power on CW, FM and FSK is 160 watts ICAS. At the maximum
power output of 160 watts, this amplifier will normally provide a 33% long-term duty cycle
without overheating. 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.
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