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AUDIO PANEL VHF communication systems are the most widely used for maintaining contact between ground and ______.
aircraft
VHF COMMUNICATIONS In 1958, the first expansion occurred and was accomplished by reducing the channel spacing to 100 kHz. In 1964, the next change in channel spacing was made and decreased the 100 kHz to 50 kHz, and was again repeated in 1974 when spacing went to 25 kHz. Extension of the frequency range occurred again in 1979 when it went up to 137 ______.
MHz
The type of aircraft communications that most frequently comes to mind is that which takes place between Pilot and ______, and uses a 'Very High Frequency' (VHF).
Controller
The equipment required for this voice link includes a transceiver or ______/receiver, antenna, microphone, audio panel, and speaker.
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In fact, what is 'new technology' today may be 'obsolete' ______.
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Once the carrier is established, the next step is to couple the information to be sent on the wave. This step is called __________.
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After the intelligence is added, the signal goes to the final power amplifier where the signal strength is determined and the modulated wave then leaves the __________.
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The 'receiver' section of the transceiver works almost in reverse of the transmitter. Once the signal has been received, it is directed into the __________.
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In this area, the intelligence that was added to the carrier wave in the transmitter is removed. This intelligence is in a rather weak state and requires amplification before it can be used by any of the aircraft audio equipment such as headphones or __________.
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Most VHF Communication Transceivers will require a fairly simple change in order to comply with the recommended criteria. In some cases, adding a discrete filter to the RF input to the first stage of signal amplifier, and a minor circuit change to compensate for signal loss is all that is required for immunity to specific levels of VHF FM broadcasts. The ICAO set January 1, 1995 as the date where after no manufacturer could sell non-compliant equipment, and by January 1, 1998, all aircraft should be in __________.
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