Technical information
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
1. Access direct tune operation. Set the mode selector to the
desired mode (USB, LSB or AM) and check to see that the display is
showing a flashing zero in the channel position (upper left) or is blank
in that position. If a channel number other than zero is displayed, it
will be necessary to move the “cursor” by depressing the
Frequency/Channel control knob (lower right). A digit on the display
will begin to flash. This flashing “cursor” indicates which digit in the
display will be changed by twisting the Frequency/Channel control
knob. Each additional time you depress the knob the “cursor” will
move one digit. Move the “cursor” until it is on the channel number.
Now, rotate the Frequency/Channel control knob until the channel
number is set to zero. You are now in direct tune operation.
2. Change the frequency. Press the Frequency/Channel control
knob to cycle the “cursor” until the first digit in the frequency you wish
to change is flashing. (You will notice that the channel number has
changed from “0” to blank.) Now rotate this knob until you have
selected the desired number. Using the Frequency/Channel control
knob in this same manner, change all the digits necessary to display
the desired frequency.
NOTE: The first one or two digits (MHz) of the frequency are dis-
played in the upper right of the display while the last four digits (kHz)
of the frequency are displayed at the bottom of the display.
To stow the “cursor”, depress the Frequency/Channel control knob
repeatedly until no digit on the display is left flashing, or key the mic
momentarily, see Step 3. (Direct tuning always provides simplex
operation-you transmit and receive on the same frequency.)
3. Tune the antenna coupler. Press the mic button momentarily to
initiate antenna tuning. During the tuning process the TX annunica-
tion will flash and the frequency numbers will blank. When the TX
stops flashing and the frequency reappears, the antenna tuning cycle
is complete and you are ready to transmit on the selected frequency.
NOTE: Always press the mic button after selecting a new frequency
to initiate antenna tuning. Otherwise you may experience poor recep-
tion or fail to hear a ground station which is calling you.
Operation
3-65
KHF 950/990 Pilots Guide
Rev. 0
Dec/96