Manual
Table Of Contents
- TITLE PAGE
- TABLE OF CONTENTS
- INTRODUCTION
- SECTION I
- CHARACTERISTICS OF HF SSB
- ACRONYMS AND DEFINITIONS
- REFERENCES
- HF SSB COMMUNICATIONS
- FREQUENCY
- SKYWAVE PROPAGATION - WHICH FREQUENCY TO
- WHY SINGLE SIDEBAND IS IMPORTANT IN HF
- AMPLITUDE MODULATION (AM)
- SINGLE SIDEBAND OPERATION
- SINGLE SIDEBAND (SSB)
- SUPPRESSED CARRIER VS. REDUCED CARRIER
- SIMPLEX AND SEMI-DUPLEX OPERATION
- AUTOMATIC LINK ESTABLISHMENT (ALE)
- FUNCTIONS OF HF RADIO AUTOMATION
- HOW ALE ASSURES THAT THE BEST COMMUNICA-TIONS
- CHARACTERISTICS OF HF SSB
- SECTION II
- SECTION III
- SECTION IV
- SECTION V
- SECTION VI
- SECTION VII
- ITU MARITIME RADIOTELEPHONE STATIONS
- DESCRIPTION OF SERVICES
- AT&T HIGH SEAS RADIOTELEPHONE SERVICE
- AT & T COAST STATION COVERAGE MAP
- COAST STATION COVERAGE & INFORMATION
- AIRCRAFT REGISTRATION
- OPERATING PROCEDURES FOR USING THE HIGH SEAS RADIOTELEPHONE NETWORK
- AT&T HIGH SEAS COAST STATIONS
- MOBILE MARINE RADIO, INC.
- WORLDWIDE LISTING OF PUBLIC CORRESPONDENCE STATIONS
- MARITIME RADIOTELEPHONE CHANNEL DESIGNATIONS
- SECTION VIII
- SECTION IX
- SECTION X
- SECTION XI
- SECTION XII
- SECTION XIII
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