WEEK 2: RIC and SUPERHET Flashcards
Who can get a radio license?
Anyone as long as they don’t have a disability that prevents them from operating a radio
When communicating on the radio, what is the first thing you say?
Who you are talking to
What is the message format?
Who you are talking
then: this is
then: your call sign’\
then: your message
then: OVER
The time 4:45am is expressed as?
0445
The time 6:37pm is expressed as?
1837
What is the time zone that we use for RIC?
UTC/GMT/Zulu time
A “.” is said as what?
Decimal
The word “HEAVY” is used to describe what?
An aircraft weighing more than 300,000lbs
If you need someone to repeat the message what do you say?
SAY AGAIN
How long should signal/radio checks last?
10s
On a signal/radio check, when someone responds “5 by 5” what does the first and second numbers mean?
the first number is the READABILITY
the second number is the STRENGTH
A distress signal uses what?
MAYDAY
An urgency signal uses what?
PAN PAN
What is the max output power for your radio license good for?
250W ERP
Why do we want the tuned circuits and Local Oscillator to be tuned at the same time?
so there’s always an IF between them
How do we get the IF?
Mixer mixes the LO with incoming RF signal
Why do we want the signal to be as sinusoidal as possible?
So no harmonics are produced
In the superhet receiver, where do we encounter the MOST gain (1000x)?
The IF
What controls the gain of the IF so that the proper voltage always comes out of the Detector?
AGC
What is the purpose of squelch?
a unique circuit for comms, it keeps the audio nice and quiet unless we are receiving a signal
What do we use to monitor backup/carrier squelch?
AGC
Squelch operates at how many volts?
2uV
AGC operates at how many volts?
20uV
