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The present invention provides combining and separation circuitry, which allows multiple signals in different frequency bands to travel in either direction over a single cable and be combined and separated as desired. In one embodiment, the combining and separation circuitry includes first, second,

The present invention provides combining and separation circuitry, which allows multiple signals in different frequency bands to travel in either direction over a single cable and be combined and separated as desired. In one embodiment, the combining and separation circuitry includes first, second, third, and fourth ports. The first port is configured to send or receive signals in a first frequency band, the second port is configured to send or receive signals in a second frequency band, and the third port is configured to send or receive DC signals, baseband signals, or a combination thereof. The fourth port is configured to be coupled to a cable in which the signals in the first and second frequency bands, as well as the DC and/or baseband signals, can be sent in either direction.

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1. A system comprising a first port, a second port, a third port, a fourth port, and a circuit network interconnecting the first, second, third, and fourth ports, and adapted to: a) provide bidirectional passage of signals within a first frequency band between the first and fourth ports, wherein a f

1. A system comprising a first port, a second port, a third port, a fourth port, and a circuit network interconnecting the first, second, third, and fourth ports, and adapted to: a) provide bidirectional passage of signals within a first frequency band between the first and fourth ports, wherein a first signal at a first frequency, the first frequency being within the first frequency band, travels in a first direction between the first and fourth ports across a cable and a second signal at a second frequency, the second frequency being within the first frequency band, travels in an opposite direction from the first direction between the first and fourth ports across the cable;b) provide bidirectional passage of signals within a second frequency band between the second and fourth ports, wherein a third signal at a third frequency, the third frequency being within the second frequency band, travels in a first direction between the second and fourth ports across the cable and a fourth signal at a fourth frequency, the fourth frequency being within the second frequency band, travels in both a first direction and an opposite direction from the first direction between the second and fourth ports across the cable; andc) provide bidirectional passage of an additional signal between the third and fourth ports, wherein the additional signal travels in a first direction, an opposite direction from the first direction, or in both the first direction and the opposite direction, between the third and fourth ports across the cable. 2. The system of claim 1 wherein the additional signal is a DC signal. 3. The system of claim 1 wherein the additional signal is a baseband signal. 4. The system of claim 1 wherein the additional signal comprises DC and baseband signals. 5. The system of claim 1 wherein the circuit network comprises first and second filter networks, which provide a first impedance between the first and fourth ports, a second impedance between the second and fourth ports, and a third impedance between the third and fourth ports. 6. The system of claim 5 further comprising protection circuitry for coupling to ground. 7. The system of claim 6 wherein the protection circuitry comprises a network of at least one capacitor in parallel with at least one diode or gas discharge tube. 8. The system of claim 1 wherein the first port, second port, third port, and fourth port form a portion of a first apparatus, and further comprising a cable and a second apparatus, which comprises a fifth port, a sixth port, a seventh port, an eighth port, and a second circuit network interconnecting the fifth, sixth, seventh, and eighth ports and adapted to: a) provide bidirectional passage of signals within a first frequency band between the fifth and eighth ports;b) provide bidirectional passage of signals with a second frequency band between the sixth and eighth ports; andc) provide bidirectional passage of DC or baseband signals between the seventh and eighth ports,wherein the cable is coupled between the fourth and eighth ports. 9. The system of claim 8 wherein the second circuit network comprises third and fourth filter networks, which provide a first impedance between the fifth and eighth ports, a second impedance between the sixth and eighth ports, and a third impedance between the seventh and eighth ports. 10. The system of claim 8 wherein the first apparatus is located in a base housing and the second apparatus is located in a masthead in a base station environment. 11. The system of claim 10 wherein the first frequency band is configured for transmit and receive signals. 12. The system of claim 11 wherein the second frequency band is configured for a synchronization signal. 13. The system of claim 12 wherein the second frequency band is configured for data. 14. The system of claim 11 wherein the second frequency band is configured for data. 15. The system of claim 11 wherein a signal is provided from the base housing to the masthead to power masthead electronics. 16. The system of claim 10 wherein the base housing electronics in the base housing are coupled to the cable via the first apparatus. 17. A system comprising a first port, a second port, a third port, a fourth port, and a circuit network interconnecting the first, second, third, and fourth ports, and adapted to: a) provide bidirectional passage of signals within a first frequency band between the first and fourth ports;b) provide bidirectional passage of signals within a second frequency band between the second and fourth ports; andc) provide bidirectional passage of an additional signal between the third and fourth ports,wherein the circuit network comprises first and second filter networks, which provide a first impedance between the first and fourth ports, a second impedance between the second and fourth ports, and a third impedance between the third and fourth ports; andwherein the first filter network comprises a first bias tee network and the second filter network comprises a second bias tee network, the first bias tee network comprising the first and fourth ports and a first node, and the second bias tee network comprising the second and third ports and a second node, which is coupled to the first node. 18. The system of claim 17 wherein the first bias tee network comprises a first LC network coupling the first port, the fourth port, and the first node, and the second bias tee network comprises a second LC network coupling the second port, the third port, and the second node. 19. The system of claim 18 wherein the first LC network comprises a first capacitance coupled between the first and second ports and a first inductance coupled between the first node and the fourth port, and wherein the second LC network comprises a second capacitance coupled between the second port and the second node and a first inductance coupled between the second node and the third port. 20. A system comprising a cable, a first port, a second port, a third port, a fourth port, a fifth port, a sixth port, a seventh port, and a eighth port, wherein the first port, second port, third port, and fourth port form a portion of a first apparatus located in a base housing, and the fifth port, sixth port, seventh port, and the eighth port form a portion of a second apparatus located in a masthead in a base station environment, and further comprising a first circuit network interconnecting the first, second, third, and fourth ports, and a second circuit network interconnecting the fifth, sixth, seventh, and eighth ports, wherein the first circuit network is adapted to: a) provide bidirectional passage of signals within a first frequency band between the first and fourth ports;b) provide bidirectional passage of signals within a second frequency band between the second and fourth ports; andc) provide bidirectional passage of an additional signal between the third and fourth ports,wherein the second circuit network is adapted to:d) provide bidirectional passage of signals within a first frequency band between the fifth and eighth ports;e) provide bidirectional passage of signals with a second frequency band between the sixth and eighth ports; andf) provide bidirectional passage of DC or baseband signals between the seventh and eighth ports.wherein the cable is coupled between the fourth and eighth ports, andwherein masthead electronics in the masthead comprise:g) a first input adapted to receive a first receive signal centered about a first center frequency from a first antenna;h) a second input adapted to receive a second receive signal centered about the first center frequency from a second antenna;i) first translation circuitry adapted to translate the first receive signal from the first antenna to being centered about a second center frequency; andj) combining circuitry adapted to combine the first receive signal centered about the second center frequency and the second receive signal to form a composite signal, which is sent to base housing electronics over the cable via the second apparatus in the first frequency band. 21. The system of claim 20 wherein the first receive signal centered about the second center frequency is combined with the second receive signal centered about the first center frequency to form the composite signal. 22. The system of claim 21 wherein the first center frequency and the second center frequency are sufficiently spread to minimize interference between the first and second receive signals in the composite signal. 23. The system of claim 20 wherein the masthead electronics further comprise second translation circuitry adapted to translate the second receive signal from the second antenna to being centered about a third center frequency, wherein the first receive signal centered about the second center frequency is combined with the second receive signal centered about the third center frequency to form the composite signal. 24. The system of claim 23 wherein the second center frequency and the third center frequency are sufficiently spread to minimize interference between the first and second receive signals in the composite signal. 25. The system of claim 20 wherein the second antenna is a main antenna also used to transmit signals centered about the first center frequency, and the first antenna is a diversity antenna associated with the second antenna, the masthead electronics further comprising circuitry adapted to transmit a transmit signal via the main antenna. 26. The system of claim 20 wherein a plurality of receive signals, including the second receive signal, are received and translated to being centered about different center frequencies and combined to form the composite signal. 27. The system of claim 20 further comprising in the base housing: a) transceiver circuitry; andb) separation circuitry adapted to separate the first and second receive signals from the composite signal in the base station electronics, wherein the first and second receive signals are provided to transceiver circuitry. 28. The system of claim 27 further comprising, in the base housing, second translation circuitry adapted to translate the first receive signal to being centered about the first center frequency prior to providing the first receive signal to the transceiver circuitry. 29. The system of claim 28 wherein the second receive signal is translated to a third center frequency before being combined with the first receive signal to form the composite signal, and further comprising third translation circuitry adapted to translate the second receive signal to being centered about the first center frequency prior to providing the second receive signal to the transceiver circuitry. 30. The system of claim 20 wherein the first and second receive signals correspond to a cellular signal transmitted from a cellular communication device. 31. The system of claim 20 wherein the first and second antennas are associated with one of a plurality of sectors for the base station environment. 32. The system of claim 31 wherein each sector uses one cable between the masthead and the base housing. 33. The system of claim 20 wherein the first center frequency is associated with a first cellular band and a fourth center frequency is associated a second cellular band; a third receive signal centered about a third center frequency is received via the first input from the first antenna; a fourth receive signal centered about the third center frequency is received via the second input from the second antenna, the masthead electronics further comprising second translation circuitry adapted to translate the third receive signal from the first antenna to being centered about a fourth center frequency, the combining circuitry further adapted to combine the third receive signal centered about the third center frequency and the second receive signal to form at least part of the composite signal, which is sent to the base housing over the cable. 34. The system of claim 33 further comprising third translation circuitry adapted to translate the fourth receive signal from the second antenna to being centered about the fourth center frequency, wherein the third receive signal centered about the fourth center frequency is combined with the fourth receive signal centered about the fourth center frequency to form at least part of the composite signal.