BendixKing KHF 990 - Manual (Page 31)

KHF 950 REMOTE UNITS
KAC 952 POWER AMPLIFIER/ANTENNA COUPLER
The KAC 952 Power Amplifier/Antenna Coupler unit (Figure 2-6) is
mounted near the HF antenna to optimize transmission efficiency.
The KAC 952 is all solid-state and can be mounted outside the air-
craft pressure vessel for operation at any altitude up to 55,000 feet.
The power amplifier in the KAC 952 amplifies the signal from the KTR
953 Receiver/Exciter into a 150 watt peak envelope power (PEP)
transmitted signal in single sideband operation and 35 watts in AM
operation.
Because the KHF 950 operates over such a broad frequency range
(2.0 to 29.9999 MHz), it is impossible to optimize the actual aircraft
HF antenna length for each frequency.
Instead, by changing its electrical impedance, the automatic antenna
coupler in the KAC 952 tunes the antenna to each frequency, making
the antenna appear to the transmitted signal as though it were the
optimum physical length.
Description
2-6 KHF 950/990 Pilots Guide
Rev. 0
Dec/96
Figure 2-5 KAC 952 Power Amplifier/Antenna Coupler