BendixKing KHF 990 - Manual (Page 36)

KTR 993 RECEIVER/EXITER/AMPLIFIER
The KTR 993 (Figure 2-10) HF Transceiver contains the
receiver/exciter, RF power amplifier, Lowpass filters, and control cir-
cuitry necessary for generation of SSB and AME signals. It is capa-
ble of 150 watts PEP output on any of 280,000 frequencies from 2 to
29.9999 MHz.
NOTE: The KHF 990 is designed for continuous duty cycle (transmit)
at 150 watts PEP for voice transmission on upper sideband (USB).
On all other type transmissions, the unit will operate continuously;
however, after an extended period of transmission the power will
begin to back down to protect the power amplifier from overheating.
The exact time required depends on the ambient temperature. For
example, after seven minutes transmission in the AM Mode the
power is approximately 1/3 of normal power output. A duty cycle of 3
minutes on and 3 minutes off will insure maximum power output.
Description
2-11 KHF 950/990 Pilots Guide
Rev. 0
Dec/96
D.C. POWER
REMOTE
ANTENNA
KTR 993 ı
Figure 2-10 KTR 993 Receiver/Exiter/Amplifier