LC filtering with auto tuning

A radio-frequency amplifier for a cable network comprising:

• (a) a forward amplifier configured to amplify a high frequency range of signals that are provided downstream to a cable receiver of said cable network;
• (b) a return amplifier configured to amplify a low frequency range of signals that are provided upstream to a head end of said cable network;
• (c) an out-of-band forward amplifier configured to amplify a digitally protected video signal having a frequency in a range between 70 MHz and 130 MHz that are provided downstream to said cable receiver of said cable network;
• (d) a notch filter configured to reject said amplified said digitally protected video signal having said frequency in said range between 70 MHz and 130 MHz from being amplified by said return amplifier;
• (e) said radio-frequency amplifier providing said high frequency range of signals together with said amplified digitally protected video signal to said cable receiver;
• and
• (f) said radio-frequency amplifier providing said low frequency range of signals without said frequencies rejected by said notch filter to said head end of said cable network, wherein said digitally protected video signal includes 104 MHz.

A radio-frequency amplifier for a cable network comprising:

• (a) a forward amplifier configured to amplify a high frequency range of signals that are provided downstream to a cable receiver of said cable network;
• (b) a return amplifier configured to amplify a low frequency range of signals that are provided upstream to a head end of said cable network;
• (c) an out-of-band forward amplifier configured to amplify a digitally protected video signal having a frequency in a range between 70 MHz and 130 MHz that are provided downstream to said cable receiver of said cable network;
• (d) a notch filter configured to reject said amplified said digitally protected video signal having said frequency in said range between 70 MHz and 130 MHz from being amplified by said return amplifier;
• (e) said radio-frequency amplifier providing said high frequency range of signals together with said amplified digitally protected video signal to said cable receiver;
• and
• (f) said radio-frequency amplifier providing said low frequency range of signals without said frequencies rejected by said notch filter to said head end of said cable network, wherein said digitally protected video signal includes 104 MHz, said high frequency range of signals includes 258 MHz to at least 750 MHz, and said low frequency range of signals includes 5 MHz to no more than 204 MHz.

A radio-frequency amplifier for a cable network comprising:

• (a) a forward amplifier configured to amplify a high frequency range of signals that are provided downstream to a cable receiver of said cable network;
• (b) a return amplifier configured to amplify a low frequency range of signals that are provided upstream to a head end of said cable network;
• (c) an out-of-band forward amplifier configured to amplify a digitally protected video signal having a frequency in a range between 70 MHz and 130 MHz that are provided downstream to said cable receiver of said cable network;
• (d) a notch filter configured to reject said amplified said digitally protected video signal having said frequency in said range between 70 MHz and 130 MHz from being amplified by said return amplifier;
• (e) said radio-frequency amplifier providing said high frequency range of signals together with said amplified digitally protected video signal to said cable receiver;
• and
• (f) said radio-frequency amplifier providing said low frequency range of signals without said frequencies rejected by said notch filter to said head end of said cable network, wherein said notch filter includes at least a 50 dB rejection ratio for said digitally protected video signal and no more than 2 dB insertion loss for a passband signal through said notch filter.