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.
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.
118.000 --- 00000 00000
118.025 --- 00000 00001
118.050 --- 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