Satellite frequency to L-band conversion

Satellite signals (at C-band and Ku-band frequencies) are converted down to L-band in the focal point of many dish antennas by a Low-Noise Block Down-Converter (LNB). In the United States, the receivers for domestic satellites usually use the conversion shown below. The Direct Broadcast Satellite receivers (Dish, Directv) use a different format. [What are the frequency limits of the microwave bands designated with letters such as C, Ku and L?]
L-band C-band Ku-band
Freq. (MHz) Freq. (MHz) Channel Freq. (MHz)
950 4200
11700
970 4180 24 11720
990 4160 23 11740
1010 4140 22 11760
1030 4120 21 11780
1050 4100 20 11800
1070 4080 19 11820
1090 4060 18 11840
1110 4040 17 11860
1130 4020 16 11880
1150 4000 15 11900
1170 3980 14 11920
1190 3960 13 11940
1210 3940 12 11960
1230 3920 11 11980
1250 3900 10 12000
1270 3880 9 12020
1290 3860 8 12040
1310 3840 7 12060
1330 3820 6 12080
1350 3800 5 12100
1370 3780 4 12120
1390 3760 3 12140
1410 3740 2 12160
1430 3720 1 12180
1450 3700
12200
This conversion is valid when the local oscillator frequency is 5150 MHz for C-band and 10750 MHz for Ku-band.
John Neuhaus
john@jneuhaus.com
Sat, Sep 21, 2002