User's Manual
Table Of Contents
- Table of contents
- List of figures
- List of tables
- Introduction
- 1 NGTtransceiver compliance
- 2 Installation
- 3 The handset
- 4 Getting started
- Switching on the transceiver
- Changing the screen contrast
- Changing the screen brightness
- Using the keys on the handset
- Accessing the Main Menu
- Switching scanning on or off
- Switching mute on or off
- Entering your station self address
- Listen Before Transmit Mode
- Replacing LQA information for all channels in an ALE/CALM network
- Making a manual sounding operation in an ALE/CALM network
- Selecting the best channel in an ALE/CALM network
- Making a Selective call from the Address List
- Making a Phone call from the Address List
- Making an emergency call using the emergency key
- Using a special ALE address syntax to make a call
- Appendix A— Standard hot keys
- Appendix B— Entering and editing text
- Appendix C— Finding words and values
- Appendix D— Creating an entry in a list
- Appendix E— HF radio transmission
- Appendix F— Definitions
- Index
HF radio transmission
NGT ASR Transceiver Getting Started Guide 75
Solar activity varies over an 11 year cycle. Higher frequencies
need to be used during periods of peak activity.
It is important to remember that you may need to change the
frequency you are using to achieve the best communication.
The general rules of thumb for HF communication are:
• the higher the sun, the higher the frequency
• the further the distance, the higher the frequency
Channels and modes
A channel is a name that is given to a frequency or a pair of
frequencies, e.g. ‘Channel 1’, ‘4500’ and ‘Headquarters’. The
frequencies may be any frequencies within the HF range.
Each channel has one or more modes associated with it. Each
mode indicates a sideband that can be used with the channel,
such as USB or LSB. When you make a call you need to
specify the channel and the mode you want to use.
Table 6 shows examples of channels and the information
associated with them.
Table 6: Examples of channels and modes
Channel Receive frequency
(kHz)
Transmit frequency
(kHz)
Modes
Channel 1 10600 10600 LSB, USB
4500 4500 – AM
Headquarters 22758 23000 USB