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
In manual operation mode four types of channels are available:
• 1 frequency agile
• 100 programmable manual channels
• 100 ALE channels
• 245 fixed ITU channels
FREQUENCY AGILE
The frequency agile channel mode provides the operator with a
scratch-pad area to make frequency and modulation changes without
modifying stored data. This mode is indicated by five underscores
“ _ _ _ _ _ “ in the channel type field and a channel number of zero
(0). The frequency agile mode is entered in two ways, it can be
selected by the operator or it is entered automatically when changes
are made to ITU or ALE channels.
ITU CHANNEL OPERATION
The ITU channels are stored in permanent memory and cannot be
changed by the operator. Tunes are not permanently stored for the
ITU channels. When an ITU channel is selected it is initially untuned.
Pressing the microphone key tunes both the receive and transmit fre-
quency for the current ITU channel. This tune information is saved in
RAM until the channel number, channel type or frequency is changed
by the operator. To allow the operator to listen on the transmit fre-
quency of the semi-duplex ITU channels, the SCAN key is used as a
receive on transmit frequency key. Pressing the SCAN key when an
ITU channel is selected changes the receiver to the transmit frequen-
cy. The transmit frequency is displayed and the communication field
indicats that the transmit frequency is being monitored.
NOTE: This function, listen on transmit frequency, is available only
for the ITU channels. Manually changing the communication field to
transmit (TX) does not change the receiver to the transmit frequency.
Selecting the transmit frequency with the communication field allows
the operator to change or view the transmit frequency.
CHANGES TO ALE AND ITU CHANNELS
The stored data for ALE and ITU channels cannot be modified.
When the operator modifies the frequency or modulation type of an
ALE or ITU channel the channel type reverts to the ‘frequency agile’.
Operation
3-16
KHF 950/990 Pilots Guide
Rev. 0
Dec/96