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Imposing changes to a carrier so as to enable it to carry information is called
Maximisation
Meditation
Mediation
Modulation
In an FM modulated signal what is changed?
The amplitude of the carrier
The bandwidth of the carrier
The frequency of the carrier
The modulated sideband of the carrier
What is the peak deviation of an FM signal
The difference between the unmodulated carrier and the peak frequency deviation of the signal
The difference between the unmodulated carrier and twice the frequency spread of the signal.
The amplitude of the signal.
The frequency of the signal
When Station A and Station B are operating on a chanelised FM section of the 2 meter band a wideband signal on an adjacent frequency can be heard by Station A but not Station B Both rigs have the option of switching between narrow and wideband on both transmit and receive.The adjacent frequency interference could caused by:
Station A has set his receiver to wideband and Station B has set his receiver to narrowband
Station A has set his receiver to narrowband and Station B has set his receiver to wideband
Both stations have set their receivers to narrow band reception
Both stations have set their receivers to wide band reception
Which of these will produce the ideal depth of modulation in an AM transmitter
0% modulation
50% modulation
100% modulation
150% moduclation
Which of these best describes the production of an SSB signal for transmission?
Audio from a microphone is fed, together with a carrier frequency from a crystal at approximately the IF frequency are fed into a balanced mixer which removes the carrier and one of the sidebands This is followed by a an IF amolifier
Audio from a microphone is fed, together with a carrier frequency from a crystal at approximately the IF frequency are fed into a balanced mixer which removes the carrier This is followed by a filter which removes one of the sidebands.
Audio from a microphone is fed, together with a carrier frequency from a crystal at approximately the IF frequency are fed into a balanced mixer which removes the carrier This is then input into the IF amplifier.
Audio from a microphone is fed, together into a crystal filter This removes the carrier and one of the sidebands before being passed on to the IF amplifier
Data modes are achieved by modulating the carrier in a number of ways depending on the mode. In F1B
Here the data output consists of a number of audio tones which are applied to the balanced modulator of an SSB transmitter. For example in RTTY there are two tones used - 1.275kHz and 1.445kHz.
here the data from a computer is applied to an AM transmitter
A compter converts the keyboard input to a series of tones which are applied to the microphone socket. This results is an FM carrier which has a tone which is constantly turned off and on
data from a computer is used to shift the frequency of the signal directly
Data modes are achieved by modulating the carrier in a number of ways depending on the mode. In F2B
data from a computer is used to shift the frequency of the signal directly
Here the data output consists of a number of audio tones which are applied to the balanced modulator of an SSB transmitter. For example in RTTY there are two tones used - 1.275kHz and 1.445kHz.
A compter converts the keyboard input to a series of tones which are applied to the microphone socket. This results is an FM carrier which has a tone which is constantly turned off and on
here the data from a computer is applied to an AM transmitter
Data modes are achieved by modulating the carrier in a number of ways depending on the mode. In J2B
here the data from a computer is applied to an AM transmitter
Here the data output consists of a number of audio tones which are applied to the balanced modulator of an SSB transmitter. For example in RTTY there are two tones used - 1.275kHz and 1.445kHz.
A compter converts the keyboard input to a series of tones which are applied to the microphone socket. This results is an FM carrier which has a tone which is constantly turned off and on
data from a computer is used to shift the frequency of the signal directly
The most common method of modulating an FM transmitter is:
to applythe audio to a zenor diode across the tuned circuit of the oscillator
to applythe audio to a varicap diode across the tuned circuit of the oscillator
to apply the audio from a microphone which is connected across the tuned circuit of the oscillator
to apply audio to the power output stage of an FM transmitter