BendixKing KHF 990 - Manual (Page 32)

KTR 953 RECEIVER/EXITER
The KTR 953 remote unit (Figure 2-6) contains the receiver and the
exciter for the KHF 950. The exciter is a transmitter which produces a
very low power signal which is fed to the power amplifier in the KAC
952.
NOTE: Only the KTR 953-01,11,41,53 (KPN 064-1015-01) is com-
patible with standard SELCAL decoder units (not furnished). The
KTR 953-01 and the SELCAL decoder are both necessary to obtain
SELCAL operation. See page 19 for additional information on SEL-
CAL.
NOTE: The KHF 950 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
2-7 KHF 950/990 Pilots Guide
Rev. 0
Dec/96
KTR 953
B
Figure 2-6 KTR 953 Receiver/Exiter