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Aviation Glossary :: Auxillary Station  Aviation Glossary :: Auxillary Station FAA Written Test Preparation
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Auxillary Station
Auxillary Station
When an amateur station, such as a repeater, is remotely controlled over a radio link, there is another station involved--the station doing the controlling. This "control" station is, under the FCC rules, called an auxiliary station defined by the FCC as "An amateur station, other than a message forwarding system, that is transmitting commu­nications point-to-point within a system of cooperating amateur stations [97.3(a)(7)]." There are a few important rules that apply to auxiliary stations:
  1. All amateurs, except Novices, may put auxiliary stations on the air [97.201(a)].
  2. An auxiliary station may transmit only on the 2 m and shorter wavelength bands, except the 144.0-144.5 MHz, 145.8-146.0 MHz, 219-220 MHz, 222.00-222.15 MHz, 431-433 MHz, and 435-438 MHz segments.
  3. When there is interference, licensees are equally responsible for solving the interference, except where one station is coordinated and the other is not [97.201(c)]. Control links should be coordinated.
  4. An auxiliary station may, under certain circumstances, be automatically controlled and may send one-way transmissions
[97.201(d), (e)].

There are several forms of auxiliary operation, such as:

  1. Remote control of a station at a different location (such as a repeater on a mountaintop), where a radio link is used to make one-way transmissions of DTMF tones to change its operating parameters
  2. Voice links between two or more stations within a system of stations, such as:
    1. Point-to-point links from a repeater's remote receiver(s) back to the main repeater site.
    2. Dedicated point-to-point links between different repeaters in a "system" of either full-time or part-time linked repeaters.
    3. A combination of remote control and point-to-point voice links intended to control and carry the voice signals from the control point to the transmitter(s) of a remotely controlled station. (This is the equivalent of replacing the wire between the microphone and the transmitter's mike input with a radio link from the microphone to the remotely located transmitter.) This is commonly referred to as an "uplink."
    4. Point-to-point links from the receiver(s) of a remotely located station back to the station's control operator(s) at their control point(s). This is the equivalent of replacing the wire between the receiver's audio output terminals and its loudspeaker with a radio link from the receiver to a remotely located loudspeaker. This is commonly referred to as a "downlink."
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source: ARRL Ham Radio Glossary

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