Dip Switch Info for R121 or R122 Rcvr
Here is a programming aid to help determine settings of the frequency control dip switch for the R121 and R122 Aviation Band Receivers. This is information too lengthy to publish in the instruction manuals, and it includes a chart for all possible frequencies. Setting Channel Frequency.The channel frequency is determined by frequency synthesizer circuits, which use a dip switch in conjunction with programming in a microcontroller to set the channel. The microcontroller reads the dip switch information and does mathematics, applying serial data to the synthesizer ic whenever power is applied or the dip switch is changed. Following is a discussion of how to set the dip switch to the desired channel frequency. NOTE: If the frequency is changed more than about 1 MHz, a complete alignment of the receiver should be per-formed, as described in later text. Optimum operation only occurs if the synthesizer is adjusted to match the frequency switch setting and all the tuned amplifier circuits are peaked for the desired frequency. Next to the frequency you choose in the chart is a stream of data, indicating settings for the ten dip switches positions, from 1 to 10, listed in two groups of 5 just to make it more readable. "0" indicates switch position open, and "1" indicates switch position closed. | Aircraft Receiver Freq. vs Dip Switch Setting:118.025 00000 00001118.050 00000 00010 118.075 00000 00011 118.100 00000 00100 118.125 00000 00101 118.150 00000 00110 118.175 00000 00111 118.200 00000 01000 118.225 00000 01001 118.250 00000 01010 118.275 00000 01011 118.300 00000 01100 118.325 00000 01101 118.350 00000 01110 118.375 00000 01111 118.400 00000 10000 118.425 00000 10001 118.450 00000 10010 118.475 00000 10011 118.500 00000 10100 118.525 00000 10101 118.550 00000 10110 118.575 00000 10111 118.600 00000 11000 118.625 00000 11001 118.650 00000 11010 118.675 00000 11011 118.700 00000 11100 118.725 00000 11101 118.750 00000 11110 118.775 00000 11111 118.800 00001 00000 118.825 00001 00001 118.850 00001 00010 118.875 00001 00011 118.900 00001 00100 118.925 00001 00101 118.950 00001 00110 118.975 00001 00111 119.000 00001 01000 119.025 00001 01001 119.050 00001 01010 119.075 00001 01011 119.100 00001 01100 119.125 00001 01101 119.150 00001 01110 119.175 00001 01111 119.200 00001 10000 119.225 00001 10001 119.250 00001 10010 119.275 00001 10011 119.300 00001 10100 119.325 00001 10101 119.350 00001 10110 119.375 00001 10111 119.400 00001 11000 119.425 00001 11001 119.450 00001 11010 119.475 00001 11011 119.500 00001 11100 119.525 00001 11101 119.550 00001 11110 119.575 00001 11111 119.600 00010 00000 119.625 00010 00001 119.650 00010 00010 119.675 00010 00011 119.700 00010 00100 119.725 00010 00101 119.750 00010 00110 119.775 00010 00111 119.800 00010 01000 119.825 00010 01001 119.850 00010 01010 119.875 00010 01011 119.900 00010 01100 119.925 00010 01101 119.950 00010 01110 119.975 00010 01111 120.000 00010 10000 120.025 00010 10001 120.050 00010 10010 120.075 00010 10011 120.100 00010 10100 120.125 00010 10101 120.150 00010 10110 120.175 00010 10111 120.200 00010 11000 120.225 00010 11001 120.250 00010 11010 120.275 00010 11011 120.300 00010 11100 120.325 00010 11101 120.350 00010 11110 120.375 00010 11111 120.400 00011 00000 120.425 00011 00001 120.450 00011 00010 120.475 00011 00011 120.500 00011 00100 120.525 00011 00101 120.550 00011 00110 120.575 00011 00111 120.600 00011 01000 120.625 00011 01001 120.650 00011 01010 120.675 00011 01011 120.700 00011 01100 120.725 00011 01101 120.750 00011 01110 120.775 00011 01111 120.800 00011 10000 120.825 00011 10001 120.850 00011 10010 120.875 00011 10011 120.900 00011 10100 120.925 00011 10101 120.950 00011 10110 120.975 00011 10111 121.000 00011 11000 121.025 00011 11001 121.050 00011 11010 121.075 00011 11011 121.100 00011 11100 121.125 00011 11101 121.150 00011 11110 121.175 00011 11111 121.200 00100 00000 121.225 00100 00001 121.250 00100 00010 121.275 00100 00011 121.300 00100 00100 121.325 00100 00101 121.350 00100 00110 121.375 00100 00111 121.400 00100 01000 121.425 00100 01001 121.450 00100 01010 121.475 00100 01011 121.500 00100 01100 121.525 00100 01101 121.550 00100 01110 121.575 00100 01111 121.600 00100 10000 121.625 00100 10001 121.650 00100 10010 121.675 00100 10011 121.700 00100 10100 121.725 00100 10101 121.750 00100 10110 121.775 00100 10111 121.800 00100 11000 121.825 00100 11001 121.850 00100 11010 121.875 00100 11011 121.900 00100 11100 121.925 00100 11101 121.950 00100 11110 121.975 00100 11111 122.000 00101 00000 122.025 00101 00001 122.050 00101 00010 122.075 00101 00011 122.100 00101 00100 122.125 00101 00101 122.150 00101 00110 122.175 00101 00111 122.200 00101 01000 122.225 00101 01001 122.250 00101 01010 122.275 00101 01011 122.300 00101 01100 122.325 00101 01101 122.350 00101 01110 122.375 00101 01111 122.400 00101 10000 122.425 00101 10001 122.450 00101 10010 122.475 00101 10011 122.500 00101 10100 122.525 00101 10101 122.550 00101 10110 122.575 00101 10111 122.600 00101 11000 122.625 00101 11001 122.650 00101 11010 122.675 00101 11011 122.700 00101 11100 122.725 00101 11101 122.750 00101 11110 122.775 00101 11111 122.800 00110 00000 122.825 00110 00001 122.850 00110 00010 122.875 00110 00011 122.900 00110 00100 122.925 00110 00101 122.950 00110 00110 122.975 00110 00111 123.000 00110 01000 123.025 00110 01001 123.050 00110 01010 123.075 00110 01011 123.100 00110 01100 123.125 00110 01101 123.150 00110 01110 123.175 00110 01111 123.200 00110 10000 123.225 00110 10001 123.250 00110 10010 123.275 00110 10011 123.300 00110 10100 123.325 00110 10101 123.350 00110 10110 123.375 00110 10111 123.400 00110 11000 123.425 00110 11001 123.450 00110 11010 123.475 00110 11011 123.500 00110 11100 123.525 00110 11101 123.550 00110 11110 123.575 00110 11111 123.600 00111 00000 123.625 00111 00001 123.650 00111 00010 123.675 00111 00011 123.700 00111 00100 123.725 00111 00101 123.750 00111 00110 123.775 00111 00111 123.800 00111 01000 123.825 00111 01001 123.850 00111 01010 123.875 00111 01011 123.900 00111 01100 123.925 00111 01101 123.950 00111 01110 123.975 00111 01111 124.000 00111 10000 124.025 00111 10001 124.050 00111 10010 124.075 00111 10011 124.100 00111 10100 124.125 00111 10101 124.150 00111 10110 124.175 00111 10111 124.200 00111 11000 124.225 00111 11001 124.250 00111 11010 124.275 00111 11011 124.300 00111 11100 124.325 00111 11101 124.350 00111 11110 124.375 00111 11111 124.400 01000 00000 124.425 01000 00001 124.450 01000 00010 124.475 01000 00011 124.500 01000 00100 124.525 01000 00101 124.550 01000 00110 124.575 01000 00111 124.600 01000 01000 124.625 01000 01001 124.650 01000 01010 124.675 01000 01011 124.700 01000 01100 124.725 01000 01101 124.750 01000 01110 124.775 01000 01111 124.800 01000 10000 124.825 01000 10001 124.850 01000 10010 124.875 01000 10011 124.900 01000 10100 124.925 01000 10101 124.950 01000 10110 124.975 01000 10111 125.000 01000 11000 125.025 01000 11001 125.050 01000 11010 125.075 01000 11011 125.100 01000 11100 125.125 01000 11101 125.150 01000 11110 125.175 01000 11111 125.200 01001 00000 125.225 01001 00001 125.250 01001 00010 125.275 01001 00011 125.300 01001 00100 125.325 01001 00101 125.350 01001 00110 125.375 01001 00111 125.400 01001 01000 125.425 01001 01001 125.450 01001 01010 125.475 01001 01011 125.500 01001 01100 125.525 01001 01101 125.550 01001 01110 125.575 01001 01111 125.600 01001 10000 125.625 01001 10001 125.650 01001 10010 125.675 01001 10011 125.700 01001 10100 125.725 01001 10101 125.750 01001 10110 125.775 01001 10111 125.800 01001 11000 125.825 01001 11001 125.850 01001 11010 125.875 01001 11011 125.900 01001 11100 125.925 01001 11101 125.950 01001 11110 125.975 01001 11111 126.000 01010 00000 126.025 01010 00001 126.050 01010 00010 126.075 01010 00011 126.100 01010 00100 126.125 01010 00101 126.150 01010 00110 126.175 01010 00111 126.200 01010 01000 126.225 01010 01001 126.250 01010 01010 126.275 01010 01011 126.300 01010 01100 126.325 01010 01101 126.350 01010 01110 126.375 01010 01111 126.400 01010 10000 126.425 01010 10001 126.450 01010 10010 126.475 01010 10011 126.500 01010 10100 126.525 01010 10101 126.550 01010 10110 126.575 01010 10111 126.600 01010 11000 126.625 01010 11001 126.650 01010 11010 126.675 01010 11011 126.700 01010 11100 126.725 01010 11101 126.750 01010 11110 126.775 01010 11111 126.800 01011 00000 126.825 01011 00001 126.850 01011 00010 126.875 01011 00011 126.900 01011 00100 126.925 01011 00101 126.950 01011 00110 126.975 01011 00111 127.000 01011 01000 127.025 01011 01001 127.050 01011 01010 127.075 01011 01011 127.100 01011 01100 127.125 01011 01101 127.150 01011 01110 127.175 01011 01111 127.200 01011 10000 127.225 01011 10001 127.250 01011 10010 127.275 01011 10011 127.300 01011 10100 127.325 01011 10101 127.350 01011 10110 127.375 01011 10111 127.400 01011 11000 127.425 01011 11001 127.450 01011 11010 127.475 01011 11011 127.500 01011 11100 127.525 01011 11101 127.550 01011 11110 127.575 01011 11111 127.600 01100 00000 127.625 01100 00001 127.650 01100 00010 127.675 01100 00011 127.700 01100 00100 127.725 01100 00101 127.750 01100 00110 127.775 01100 00111 127.800 01100 01000 127.825 01100 01001 127.850 01100 01010 127.875 01100 01011 127.900 01100 01100 127.925 01100 01101 127.950 01100 01110 127.975 01100 01111 128.000 01100 10000 128.025 01100 10001 128.050 01100 10010 128.075 01100 10011 128.100 01100 10100 128.125 01100 10101 128.150 01100 10110 128.175 01100 10111 128.200 01100 11000 128.225 01100 11001 128.250 01100 11010 128.275 01100 11011 128.300 01100 11100 128.325 01100 11101 128.350 01100 11110 128.375 01100 11111 128.400 01101 00000 128.425 01101 00001 128.450 01101 00010 128.475 01101 00011 128.500 01101 00100 128.525 01101 00101 128.550 01101 00110 128.575 01101 00111 128.600 01101 01000 128.625 01101 01001 128.650 01101 01010 128.675 01101 01011 128.700 01101 01100 128.725 01101 01101 128.750 01101 01110 128.775 01101 01111 128.800 01101 10000 128.825 01101 10001 128.850 01101 10010 128.875 01101 10011 128.900 01101 10100 128.925 01101 10101 128.950 01101 10110 128.975 01101 10111 129.000 01101 11000 129.025 01101 11001 129.050 01101 11010 129.075 01101 11011 129.100 01101 11100 129.125 01101 11101 129.150 01101 11110 129.175 01101 11111 129.200 01110 00000 129.225 01110 00001 129.250 01110 00010 129.275 01110 00011 129.300 01110 00100 129.325 01110 00101 129.350 01110 00110 129.375 01110 00111 129.400 01110 01000 129.425 01110 01001 129.450 01110 01010 129.475 01110 01011 129.500 01110 01100 129.525 01110 01101 129.550 01110 01110 129.575 01110 01111 129.600 01110 10000 129.625 01110 10001 129.650 01110 10010 129.675 01110 10011 129.700 01110 10100 129.725 01110 10101 129.750 01110 10110 129.775 01110 10111 129.800 01110 11000 129.825 01110 11001 129.850 01110 11010 129.875 01110 11011 129.900 01110 11100 129.925 01110 11101 129.950 01110 11110 129.975 01110 11111 130.000 01111 00000 130.025 01111 00001 130.050 01111 00010 130.075 01111 00011 130.100 01111 00100 130.125 01111 00101 130.150 01111 00110 130.175 01111 00111 130.200 01111 01000 130.225 01111 01001 130.250 01111 01010 130.275 01111 01011 130.300 01111 01100 130.325 01111 01101 130.350 01111 01110 130.375 01111 01111 130.400 01111 10000 130.425 01111 10001 130.450 01111 10010 130.475 01111 10011 130.500 01111 10100 130.525 01111 10101 130.550 01111 10110 130.575 01111 10111 130.600 01111 11000 130.625 01111 11001 130.650 01111 11010 130.675 01111 11011 130.700 01111 11100 130.725 01111 11101 130.750 01111 11110 130.775 01111 11111 130.800 10000 00000 130.825 10000 00001 130.850 10000 00010 130.875 10000 00011 130.900 10000 00100 130.925 10000 00101 130.950 10000 00110 130.975 10000 00111 131.000 10000 01000 131.025 10000 01001 131.050 10000 01010 131.075 10000 01011 131.100 10000 01100 131.125 10000 01101 131.150 10000 01110 131.175 10000 01111 131.200 10000 10000 131.225 10000 10001 131.250 10000 10010 131.275 10000 10011 131.300 10000 10100 131.325 10000 10101 131.350 10000 10110 131.375 10000 10111 131.400 10000 11000 131.425 10000 11001 131.450 10000 11010 131.475 10000 11011 131.500 10000 11100 131.525 10000 11101 131.550 10000 11110 131.575 10000 11111 131.600 10001 00000 131.625 10001 00001 131.650 10001 00010 131.675 10001 00011 131.700 10001 00100 131.725 10001 00101 131.750 10001 00110 131.775 10001 00111 131.800 10001 01000 131.825 10001 01001 131.850 10001 01010 131.875 10001 01011 131.900 10001 01100 131.925 10001 01101 131.950 10001 01110 131.975 10001 01111 132.000 10001 10000 132.025 10001 10001 132.050 10001 10010 132.075 10001 10011 132.100 10001 10100 132.125 10001 10101 132.150 10001 10110 132.175 10001 10111 132.200 10001 11000 132.225 10001 11001 132.250 10001 11010 132.275 10001 11011 132.300 10001 11100 132.325 10001 11101 132.350 10001 11110 132.375 10001 11111 132.400 10010 00000 132.425 10010 00001 132.450 10010 00010 132.475 10010 00011 132.500 10010 00100 132.525 10010 00101 132.550 10010 00110 132.575 10010 00111 132.600 10010 01000 132.625 10010 01001 132.650 10010 01010 132.675 10010 01011 132.700 10010 01100 132.725 10010 01101 132.750 10010 01110 132.775 10010 01111 132.800 10010 10000 132.825 10010 10001 132.850 10010 10010 132.875 10010 10011 132.900 10010 10100 132.925 10010 10101 132.950 10010 10110 132.975 10010 10111 133.000 10010 11000 133.025 10010 11001 133.050 10010 11010 133.075 10010 11011 133.100 10010 11100 133.125 10010 11101 133.150 10010 11110 133.175 10010 11111 133.200 10011 00000 133.225 10011 00001 133.250 10011 00010 133.275 10011 00011 133.300 10011 00100 133.325 10011 00101 133.350 10011 00110 133.375 10011 00111 133.400 10011 01000 133.425 10011 01001 133.450 10011 01010 133.475 10011 01011 133.500 10011 01100 133.525 10011 01101 133.550 10011 01110 133.575 10011 01111 133.600 10011 10000 133.625 10011 10001 133.650 10011 10010 133.675 10011 10011 133.700 10011 10100 133.725 10011 10101 133.750 10011 10110 133.775 10011 10111 133.800 10011 11000 133.825 10011 11001 133.850 10011 11010 133.875 10011 11011 133.900 10011 11100 133.925 10011 11101 133.950 10011 11110 133.975 10011 11111 134.000 10100 00000 134.025 10100 00001 134.050 10100 00010 134.075 10100 00011 134.100 10100 00100 134.125 10100 00101 134.150 10100 00110 134.175 10100 00111 134.200 10100 01000 134.225 10100 01001 134.250 10100 01010 134.275 10100 01011 134.300 10100 01100 134.325 10100 01101 134.350 10100 01110 134.375 10100 01111 134.400 10100 10000 134.425 10100 10001 134.450 10100 10010 134.475 10100 10011 134.500 10100 10100 134.525 10100 10101 134.550 10100 10110 134.575 10100 10111 134.600 10100 11000 134.625 10100 11001 134.650 10100 11010 134.675 10100 11011 134.700 10100 11100 134.725 10100 11101 134.750 10100 11110 134.775 10100 11111 134.800 10101 00000 134.825 10101 00001 134.850 10101 00010 134.875 10101 00011 134.900 10101 00100 134.925 10101 00101 134.950 10101 00110 134.975 10101 00111 135.000 10101 01000 135.025 10101 01001 135.050 10101 01010 135.075 10101 01011 135.100 10101 01100 135.125 10101 01101 135.150 10101 01110 135.175 10101 01111 135.200 10101 10000 135.225 10101 10001 135.250 10101 10010 135.275 10101 10011 135.300 10101 10100 135.325 10101 10101 135.350 10101 10110 135.375 10101 10111 135.400 10101 11000 135.425 10101 11001 135.450 10101 11010 135.475 10101 11011 135.500 10101 11100 135.525 10101 11101 135.550 10101 11110 135.575 10101 11111 135.600 10110 00000 135.625 10110 00001 135.650 10110 00010 135.675 10110 00011 135.700 10110 00100 135.725 10110 00101 135.750 10110 00110 135.775 10110 00111 135.800 10110 01000 135.825 10110 01001 135.850 10110 01010 135.875 10110 01011 135.900 10110 01100 135.925 10110 01101 135.950 10110 01110 135.975 10110 01111 136.000 10110 10000 136.025 10110 10001 136.050 10110 10010 136.075 10110 10011 136.100 10110 10100 136.125 10110 10101 136.150 10110 10110 136.175 10110 10111 136.200 10110 11000 136.225 10110 11001 136.250 10110 11010 136.275 10110 11011 136.300 10110 11100 136.325 10110 11101 136.350 10110 11110 136.375 10110 11111 136.400 10111 00000 136.425 10111 00001 136.450 10111 00010 136.475 10111 00011 136.500 10111 00100 136.525 10111 00101 136.550 10111 00110 136.575 10111 00111 136.600 10111 01000 136.625 10111 01001 136.650 10111 01010 136.675 10111 01011 136.700 10111 01100 136.725 10111 01101 136.750 10111 01110 136.775 10111 01111 136.800 10111 10000 136.825 10111 10001 136.850 10111 10010 136.875 10111 10011 136.900 10111 10100 136.925 10111 10101 136.950 10111 10110 136.975 10111 10111 137.000 10111 11000 |