| 455 / | HD | TELECOMMUNICATIONS |
|
| 130 | DF | RECEIVER OR ANALOG MODULATED SIGNAL FREQUENCY CONVERTER {24} |
| 230 | DF | .~ Local control of receiver operation {7} |
| 232.1 | DF | .~.~ Gain control {2} |
| 234.1 |  | .~.~.~ Automatic {15} |
| 234.2 | DF | .~.~.~.~> Processor controlled |
| 235.1 | DF | .~.~.~.~> Forward acting |
| 236.1 | DF | .~.~.~.~> Variable conversion efficiency (variable oscillator amplitude, etc.) |
| 237.1 | DF | .~.~.~.~> Responsive to locally injected pilot |
| 238.1 | DF | .~.~.~.~> Responsive to vehicle speed |
| 239.1 | DF | .~.~.~.~> Nonlinear automatic gain control {4} |
| 245.1 | DF | .~.~.~.~> Automatic gain control signal derived from information signal {1} |
| 246.1 | DF | .~.~.~.~> Responsive to plural inputs {1} |
| 248.1 | DF | .~.~.~.~> Constant or controlled input impedance |
| 249.1 | DF | .~.~.~.~> Variable attenuator type |
| 250.1 | DF | .~.~.~.~> Automatic gain control to improve strong signal handling |
| 251.1 | DF | .~.~.~.~> Plural stages with different levels or bias to each stage (e.g., partial automatic gain control) |
| 252.1 | DF | .~.~.~.~> Semiconductor |
| 253.1 | DF | .~.~.~.~> Plural stages controlled with plates, screen grids, or cathodes connected in parallel |
| 253.2 | DF | .~.~.~.~> Plural amplifier stages |