HF Communucations Flashcards
HF Communications is used in _____.
long range communication
HF Communication frequency range?
2 to 30MHz and 100Hz increments channel spacing
What is an Antenna Coupler?
It electronically compensate the length of the antenna.
What is a Lightening Arrester?
It protects coupler and transceiver.
3 types of antenna commonly used.
- Straight wire
- Lance (Probe)
- Notch
High power output from transceiver ( ____ watts typical) and wave skip off ionosphere allow long range communications.
400 watts
High power could also create _____ burns.
RF burns
An ______ is typically generated during the “tuning” of the HF system
Audio tone
As the transceiver and coupler are tuned to a new frequency, the ______ can be heard to verify the tuning operation
Audio tone
What is BITE?
(Built In Test Equipment) systems using either meters or LED’s
What is HF modulation?
It typically use AM, and SINGLE SIDE BAND (SSB)
SSB transmission allows for ____ during transmission
greater power
What is produced when no input is given
No signal is produced
HF is a middle frequency range, inasmuch it starts just above the standard broadcast band, which ends at approximately _______ kHz.
1700 kHz
Most HF transmissions are used for voice communication; however digital data (like email or text-message type) can also be transmitted using HF system. This type of transmission is referred as ________.
Data Mode
