ALE (Automatic Link Establishment) Flashcards
What is automatic link establishment ?
Automatic link establishment. Is a worldwide standard for digitally initiating and sustaining HF radio communications.
What is within an ALE system?
An ALE radio combines with a Hf SSB radio transceiver with an internal micro processor and MFSK modem
How does ALE work ?
The ALE system when inactive searches - list of HF frequencies for a suitable channel and picks the channels with the highest (BER)bit error rate, the system then stores it within a channel list.
What is a bit error rate ?
The BER is a measure of signal quality.
How is BER worked out ?
The ratio of the number of bits, elements or characters compares to the total number of bits sent during a specified time.
What is SELCAL?
Selective calling
How does SELCAL work?
Selective calling locks out all signals except ones with the correct key, in this case it’s a specific code as the key.
What happens upon successful linking within an ALE system ?
The receiver emits an alarm with a visual alert., indicating the incoming call. It also brings up callsigns and any other information linked to the station.
What are the 3 types of mode ALE systems use ?
SMS (text message)
Speech
Offers a data link.
Name 5 common applications of ALE ?
Alerting,voice, data, email, images, telemetry and texting.
Who are the most likely to use ALE?
The U.S armed forces use ALE systems as well as HF ALE systems who are used by emergency, disaster relief agencies as well as military and guard forces.
What are the advantages or ALE systems ?
Adaptable to the environment
Range of the transmission
