Abstract:
The present invention relates to a system and method for terrestrial transmission of RF signals comprising: an antenna, where said antenna includes an active device and a passive device and a decoder. The passive device receives RF signals and passes the signals to the active device. The active device includes at least one amplifier, where active device down converts the RF signals to IF signals and applies a gain to at least one of the RF signals and the IF signals. The decoder connects to the antenna, where decoder receives and analyzes the IF signals from said antenna and upon receipt of the IF signals sends commands to the active device in order to maintain an acceptable IF signal, where said commands instruct the active device to selectively adjust the gain.

Description:
BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   The present invention relates to a hypercable antenna control (HyCAnC®) process for individual reception and collection of Lband distribution for terrestrial transmission networks, particularly for Hypercable transmission networks or satellite transmission networks. 
   2. Description of Related Art 
   Receiver/Decoders, analog or digital, used in network and/or satellite transmission networks usually have a reception range associated with normal use. Most satellite decoders have a signal range from −70 dBm to −20 dBm although some decoders may have different limitations, but the principle remains the same for all type of systems. Antennas receive RF signals for down conversion and transmission to the decoders. The antennas used in network and satellite transmissions usually have a passive device, i.e., offset-dish—array—dipoles, and an active device, which includes a mixer for down conversion and a low noise amplifier (LNA) that amplifies the signal received by the passive device. The active device may include several amplification stages that may amplify either the RF signal, IF signal, or both the RF and IF signals. Similar to decoders, the amplifiers used in the antennas are also subject to limitations and have operational ranges associated with them. 
   Terrestrial transmission of signals involves the transmission of signals horizontally across a terrestrial plane. Transmitters may receive RF signals from a satellite and transmit the RF signals to antennas that down convert and transmit to an end user decoder. The signal strength between the transmitter and decoder usually correlates to the distance of between the receiver/decoder and the transmitter. At relatively short distances between the receiver/decoder and transmitter, the signal strength tends to be very high, conversely as at longer distances between the receiver/decoder and transmitter signal strength tends to weaken and become very low. Consequently, the decoder&#39;s operational parameters, upper and lower limits, may well depend upon the distance between the receiver/decoder and transmitter, where if the distance is too close or too great, then the receiver/decoder will not probably receive the signal. Table A, below, shows some exemplary readings which demonstrate characteristics associated with terrestrial transmission. 
   
     
       
             
             
             
             
           
             
             
             
             
           
         
             
                 
               TABLE A 
             
             
                 
                 
             
             
                 
                 
               One Carrier 
               15 Carriers 
             
             
                 
                 
             
           
           
             
                 
             
           
        
         
             
               Distance from 
               Level = 
               Level = −75 dBm 
               Level = −60 dBm 
             
             
               Transmitter = 2 km 
                −90 dBm 
             
             
               Distance from 
               Level = 
               Level = −99 dBm 
               Level = −84 dBm 
             
             
               Transmitter = 32 km 
               −120 dBm 
             
             
                 
             
           
        
       
     
   
   In contrast, satellite signal transmission functions in a different manner than terrestrial transmission. The signals associated with satellite transmissions are usually uniform across a large area. The satellite signal transmissions are substantially the same for an entire continent and/or country and a receiver/decoder receiving satellite signals usually receive substantially the same signal strength wherever the receiver/decoder is located inside the satellite footprint. Table B shows exemplary readings associated with satellite transmissions. 
   
     
       
             
           
             
             
             
           
         
             
               TABLE B 
             
             
                 
             
             
               Satellite Reception Field Levels −150 dBw (−120 dBm): 
             
             
                 
             
           
           
             
                 
             
           
        
         
             
                 
               Paris = 
               −120 dBm dist from Satellite = 36,400 km 
             
             
                 
               Barcelona = 
               −120 dBm dist from Satellite = 36,200 km 
             
             
                 
                 
             
           
        
       
     
   
   Base upon the foregoing, one can realize that the modification of terrestrial transmission may be necessary in order to ensure proper receipt by the decoders. The amplifiers within the antenna&#39;s active device may be used to address problems associated with terrestrial signal transmission. Usually these amplifiers apply a gain to the RF signal or converted IF signal in order to prevent fading that may occur. The amplifier may however inadvertently and unnecessarily amplify signals with sufficient strength for reception by the decoder. On these occasions, the amplifiers actually saturate the signal and consequently produce a signal that is too strong for reception by the decoder, such as in one exemplary embodiment a 1 GHz LNB may have an max gain of −55 dBm. 
   U.S. Pat. No. 6,512,428 to Hirtzlin et al. (Hirtzlin) relates to a device which affects the simultaneous reception/transmission of signals between a decoder and terrestrial base station. The Hirtzlin device employs a low-noise amplification stage in order to control parasitic coupling between the transmission and reception signals. The reception path may be disturbed by a parasitic signal created by coupling of the transmission signal transmitted over the transmission path. The parasitic signal may saturate the input stage of the reception path and the Hirtzlin device provides a means to minimize the degradation brought about by the parasitic signal. 
   U.S. Pat. No. 6,549,754 to Miller et al. (Miller) relates to an in-flight entertainment (IFE) system that provides live video/audio programming to passengers and operators over an aircraft video/audio distribution system. The Miller system uses programming signals from intermediate frequency (IF) signals that are produced by frequency down converting satellite broadcast signals and supplied over a pair of IF signal output cables. The Miller also uses control signals and DC power in the frequency down conversion process over the IF signal output cables in a reverse direction. 
   U.S. Pat. No. 6,549,755 to Chu et al. (Chu) relates to a method and apparatus for monitoring and controlling the operating point of a satellite transponder amplifier. Chu is directed toward controlling the transmission of signals from a satellite to terrestrial transponders. The Chu apparatus develops a histogram of the received signal and compares the acquired histogram to a template histogram in order to determine an amount of compression. The apparatus then uses the amount of compression to determine the operating point of the satellite transponder amplifiers. 
   The prior art however fails to address fading and saturation that may occur between a terrestrial antenna and an end user decoder. It would accordingly be advantageous to have a system and method to selectively amplify and control the amplification of input signals to the decoder based upon instantaneous commands from the target decoder. By using the decoder commands, the active device of the antenna may readily maintain an acceptable IF signal for receipt by the decoder while avoiding the saturation and fading problems discussed above. 
   SUMMARY OF THE INVENTION 
   The present invention relates to a system and method for terrestrial transmission of RF signals where a HyCAnC® antenna in conjunction with a HyCAnC® decoder actively and selectively control the transmitted IF signal from the HyCAnC® antenna. The HyCAnC® decoder continuously analyzes the received IF signal and instantaneously transmits commands to the HyCAnC® antenna. The commands provide the HyCAnC® antenna with instructions with respect to the selective amplification of the IF signal. Based upon the commands, the HyCAnC® either maintains, amplifies or de-amplifies the gain applied to either the RF signal, IF signal or both signals in order to maintain an acceptable IF signal for receipt by the HyCAnC® decoder. The present invention therefore maintains an optimal IF signal through the use of the HyCAnC® antenna and decoder. 
   It is therefore an object of the present invention to provide a system that includes an antenna and a decoder, where the antenna further includes an active device and a passive device. The passive device receives RF signals and passes the signals to the active device. The active device includes at least one amplifier, down converts the RF signals to IF signals and applies a gain to at least one of the RF signals and the IF signals. The decoder connects to the antenna, where decoder receives the IF signals from said antenna and upon receipt of the IF signals sends commands to the active device in order to maintain an acceptable IF signal, where the commands instruct the active device to selectively adjust the gain. 
   It is yet another object of the present invention to provide a method for a terrestrial transmission of RF signals comprising the steps of: receiving RF signals via an antenna; down converting RF signals to IF signals; transmitting the IF signals via a wire to a decoder; transmitting commands via the wire to the antenna from the decoder upon receipt of the IF signals; adjusting the RF signals and the IF signals based upon the commands; and maintaining an acceptable IF signal for receipt by the decoder. 
   It is yet another object of the present invention to provide a system for terrestrial transmission of RF signals comprising: a plurality of antennas, where each antenna includes an active device that down converts the RF signals to IF signals and a passive device that receives RF signals; a plurality of master decoders that receive and analyze the IF signals from each antenna and upon receipt of the IF signals, sends commands to each respective active device in order to maintain an acceptable IF signal; and a distribution switch that receives each IF signal transmitted through each master decoder and transmits each IF signal to a plurality of end user decoders that receive and analyze the IF signals from said distribution switch, and upon receipt of the IF signals send commands to the distribution switch in order to maintain an acceptable IF signal. 
   In accordance with these and other objects which will become apparent hereinafter, the instant invention will now be described with particular reference to the accompanying drawings. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1A  shows a graph of a signal range associated with an exemplary terrestrial broadcast network. 
       FIG. 1B  shows an overview of a satellite signal transmission. 
       FIG. 2  shows a graph of terrestrial signal transmission over a topography. 
       FIG. 3A  shows an exemplary amplifier for the present invention. 
       FIG. 3B  shows an exemplary amplifier for the present invention as activated by decoder commands. 
       FIG. 4A  shows an active device of an antenna with a 30 dB gain according to the present invention. 
       FIG. 4B  shows an active device of an antenna with a 45 dB gain according to the present invention. 
       FIG. 4C  shows an active device of an antenna with a 60 dB gain and 45 dB gain according to the present invention. 
       FIG. 4D  shows an active device of an antenna with a 60 dB gain and 45 dB gain according to the present invention. 
       FIG. 5  shows an exemplary method according to the present invention. 
       FIG. 6  shows an overview of a HyCAnC (HCC) antenna, an active device and a HCC decoder. 
       FIG. 7  shows an overview of a comparison of satellite signal and terrestrial signal transmissions. 
       FIG. 8  shows a standard configuration for collective distribution. 
       FIG. 9  shows a configuration for collective distribution using the HCC process of the present invention. 
       FIG. 10  shows a configuration for collective distribution using the HCC process for multiple antennas. 
   

   DETAILED DESCRIPTION 
   The present invention improves the reception of digital or analog signals within a terrestrial network under all signal level conditions. The present invention also improves the satellite reception capabilities as well as the reception for Lband distribution networks. The present invention maintains the signal level of the receiver/decoder and the active antenna inside their reception level limitation (maximum and minimum). The present invention resides within the reception antenna and the receiver/decoder. For the antenna, the present invention may be installed within memory residing inside the active portion of the antenna, i.e., LNA, a HCC antenna, LNB or other amplification device. The present invention provides a special antenna, a HCC antenna, which is able to adjust the gain of the active device automatically in order to keep the received signal level within the functional limitations of the receiver/decoder as well as the amplification circuits of the active device. When comparing a prior art satellite antenna with the HCC antenna of the present invention, the prior art satellite antenna has a fixed gain (active and passive device) and is not able to have any gain adjustment, in contrast, the HCC antenna of the present invention will automatically adjust the HCC antenna gain depending on the received signal level. The HCC antenna delivers the terrestrial signal to the receiver/decoder and the receiver/decoder reciprocally transmits control commands back to the HCC antenna. The HCC antenna receives the control commands in order to set the appropriate gain. The control command type depends upon the signal analysis of the decoder. The commands, which are sent by the decoder for controlling the HCC antenna, are sent through the same cable as the one that is delivering the reception signal from the antenna to the decoder. The commands that are sent by the decoder to the HCC antenna are currently using the existing DiSEqC process, i.e., DiSEqC 1.0, DiSEqC 1.2, DiSEqC 2.0. However, in several cases the DiSEqC process can&#39;t be used, therefore any other type of signal, existing and future, can be used for the HyCAnC® process, i.e., voltage, modulation, or any other future standards. 
   The active part of the HCC antenna, LNB, LNA, is designed with several amplification stages, which may amplify received signal, convert the signal received to a lower band and amplify the lower band signal. Each amplification stage has its own set parameters. The object of the present invention is to avoid sending a signal outside of the parameters for each one of the amplifier stages. When the signal coming to the HCC antenna is too strong for transmission to the decoder or the LNA-LNB, the HCC antenna will adjust to the appropriate configuration in order to avoid saturating the amplification stage. If the incoming signal is too low, then the HCC antenna will adjust to the appropriate amplification stage in order to have enough signal. The decoder of the present invention controls all these functions. 
     FIG. 1   a  shows a graph of the signal strength with a typical terrestrial broadcast network. As can be seen in the graph, the decoder receives signals once the transmitter is beyond 30 kilometers from the decoder. At distances less than 30 kilometers, the signal strength is too strong for the decoder to properly function and to receive the signal. The reception range for the decoder is −20 dBm to −70 dBm. As shown in the graph, this range begins to be realized at beyond 30 kilometers. Referring now to  FIG. 1   b , a overview of a satellite signal transmission is shown. As can be seen in  FIG. 1   b , satellite  10  maintains an orbit around the earth  12 . The satellite  10  orbits the earth  12  at about 36,000 km and as shown in  FIG. 1   b , it translates to 36,200 km from transmitter  17  and 36,400 km from transmitter  15 . Although, a 200 km difference exists between the transmitters  15  and  17 , signal strength remains constant due to the transmitters being within the satellite&#39;s  10  footprint. Referring now to  FIG. 2 , a terrestrial reception graph is shown. This terrestrial reception graph  20  shows the signal strength in relation to the distance from transmitter  21  over the shown topography. Transmitter  21  is shown at the top of the graph, a top view  25  of the topography of an exemplary area. Below the top view  25  of the topography is shown a line of sight  24  in relation to a horizon view of the topography  22 . The signal strength is shown to drop off as the distance increases from transmitter  21 . Usually Hypercable networks are occupying a spectrum of 1 or 2 Ghz (10.6 Ghz to 11.6 Ghz or 12.6 Ghz). Fading phenomenon does not occur proportionally for the entire 1 Ghz spectrum, but only for small part of the spectrum (around 100-200 Mhz bandwidth). When the fading happens on a frequency that is not monitored by a decoder, then the antenna output level won&#39;t be modified and the end user connected to the Multiswitch will loose some carriers that are affected by the fading phenomenon. 
   Due to the steady drop off of signal strength along a terrestrial signal transmission, a significant amount of fading may occur in relation to receipt of the signal by decoder. To address problems associated with fading, many decoders that receive signals from antenna implore the use of amplifiers to ensure signal strength is acceptable for proper transmission through the decoder. The amplification signal is usually taken without consideration of the actual received signal strength and therefore, the signal may become saturated by over amplification of an already strong signal. The present invention actively monitors the signal strength and adjusts amplification accordingly to avoid both fading and saturation that may be associated with the signal transmission and amplification thereof. The present invention uses a special HCC antenna, which is able to actively adjust the gain of the amplifier in response to the received signal by the HCC decoder. Some of the antennas of the prior art include an active and a passive device, where the active device includes amplifiers that amplify the received signals. The passive device receives signals from the target satellite. The amplifiers of the prior art, however, have a fixed gain, as opposed to a gain that may be readily adjusted based upon the received signal strength. The HCC antenna automatically adjusts the antenna gain depending on the received signal strength, and therefore avoids saturation that might occur and also prevents any fading of weak signals. 
     FIG. 3   a  shows an exemplary amplifier according to the present invention. An input signal  38  enters into an input amplifier  31 , which is in parallel with a switch  32  that transmits an output signal  39 . The switch  32  is shown to bypass the input amplifier  31  and allow input signal  38  to transmit without amplification. Arrow  36  shows a HCC decoder command signal that is sent to the switch  32 . The switch  32  then either remains open, and therefore, bypassing input amplifier  31  as shown in  FIG. 3   a  or switch  32  may close and then allow the amplification of input signal  38  through the input amplifier  31  as shown in  FIG. 3   b . The HCC decoder, therefore, actively monitors the signal strength received, alerts the switch  32  to bypass the input amplifier  31  or to close and allow amplification of the input signal  38 . The input amplifier  31  provides a +15 dB gain for input signal  38  when the switch  32  is in a closed position. The HCC decoder is based on any existing decoder of the market, i.e., Satellite, QPSK, 8PSK, OFDM, COFDM, 8VSB, QAM, in which a special process, HyCAnC®, must be implemented. 
     FIGS. 4   a  through  4   d  show various applications of the active device of the HCC antenna.  FIG. 4   a  shows an amplifier configuration that allows for a 30 dB gain to be applied to the input signals  38 . Two input amplifiers  31   a ,  31   b  are shown forward of a mixer  35  and two output amplifiers  33   a ,  33   b  are downstream of the mixer  35 . A RF switch  32  is shown to bypass the first input amplifier  31   a  but allows for the input signal  38  to pass through input amplifier  31   b  and forward into the mixer  35  which includes a local oscillator  37 . The mixer  35  down converts high frequency RF signal to an intermediate frequency (IF) to be received by the HCC decoder. The IF signal leaving mixer  35  leads into output amplifier  33   b  and then is sent to the HCC decoder. As can be seen an IF switch  34  bypassed the output amplifier  33   a  and then allows for the transmission of the IF signal through output amplifier  33   b . Accordingly, a 15 dB gain is placed upon the input RF signal, and a 15 dB gain is placed on the output IF signal, thus providing a 30 dB total gain for the output signal  39  being sent to the HCC decoder. As a response to receipt of the output signal  39 , the HCC decoder transmits commands back to the active device  30  which determines the activation or deactivation of RF switch  32  and IF switch  34 . 
   Referring now to  FIG. 4   b , a 45 dB gain is shown on the active device  30 . The RF switch  32  of  FIG. 4   b  is shown to be closed, and therefore allowing the transmission of input signal  38  through both input amplifiers  31   a  and  31   b  and providing a 30 dB gain prior to transmission into the mixer  35 . The IF switch  34  remains open and bypassing output amplifier  33   a  and providing a 15 dB gain upon the IF signal being sent to the HCC decoder. Referring now to  FIG. 4   c , a 60 dB gain configuration of the active device  30  is shown. The RF switch  32  is closed therefore transmitting the input signal through both input amplifiers  31   a  and  31   b  and providing a 30 dB gain on the input signal  38 . The IF switch  34  is also closed, therefore the IF signal passes through output amplifiers  33   a  and  33   b , providing a 30 dB gain upon the IF signal prior to transmission to the HCC decoder. Accordingly, the configuration of the active device  30  of  FIG. 4   c  provides a total 60 dB gain for output signal  39 . Referring now to  FIG. 4   d , a 45 dB gain amplification configuration is shown in relation to the active device  30 . The RF switch  32  of  FIG. 4   d  bypasses the input amplifier  31   a  and provides a 15 dB gain on the input signal into the mixer  35 . However, the IF switch  34  is closed, so the output IF signal travels through both output amplifiers  33   a  and  33   b . Accordingly, the IF signal transmitted to the decoder is subject to a 30 dB gain, so the total gain is 45 dB. 
     FIG. 5  shows an exemplary method according to the present invention. Initially, the HCC antenna transmits a signal to the HCC decoder, step  110 . The HCC decoder receives the signal, step  120 , and analyzes the signal&#39;s strength, step  130 . The HCC decoder determines the signal&#39;s strength, step  140 , and then if the signal is below a lower threshold, step  150 , the decoder transmits amplification commands back to the active device of the HCC antenna, step  160 , in order to amplify the signal and place it into the proper range for reception. If the received signal by the HCC decoder is above a certain threshold, step  170 , then the HCC decoder transmits commands back to active device to reduce the amplification of levels, step  180 , associated with the signal. If the signal analysis of the HCC decoder determines that the received signal is within the acceptable range, then the HCC decoder transmits commands back to the active device, step  190 , to maintain the current amplification levels. 
     FIG. 6  shows an overview of the HCC antenna  40  receiving signals for input into active device  30  and then outputting the signals to the HCC decoder  45 . The active device  30  of  FIG. 6  is shown with two input amplifiers and two output amplifiers as discussed in relation to  FIGS. 4   a  through  4   d . Although active device  30  has been described within this application with up to four amplification stages, two residing on each side of mixer  35 , additional or less amplification stages may be implemented on both the input and output sides mixer  35  and the gain associated with the individual amplifiers may also vary. 
     FIG. 7  shows an overview of the terrestrial transmission that the present invention addresses as compared to satellite signal transmissions. Satellite transmission, as shown in  FIG. 7 , starts initially from satellite  10  and is transmitted to a receiver through the earth&#39;s atmosphere. To the right of  FIG. 7  is shown the layers of the earth&#39;s atmosphere. Satellite signal transmission is directed through these layers toward a transmitter residing on the earth&#39;s surface. The satellite  10  orbits the earth in the region referred to as exosphere, which is the top of the thermosphere. Below the thermosphere are the regions referred to as the mesosphere, stratosphere, and troposphere. The most volatile level of the earth&#39;s atmosphere is the troposphere, which is the lowest atmospherical area surrounding the earth, which starts at the earth&#39;s surface and extends to 8 to 14 kilometers high. The troposphere is the most dense, and all of weather activity takes place within this region. The satellite signal transmitted from satellite  10  penetrates each level of the atmosphere in a pinpoint manner as shown in  FIG. 7 . However, a terrestrial transmission which takes place between hypercable antenna  16  and hypercable transmitter  14  is transmitted across the troposphere exclusively. The satellite signal transmission exposure to the troposphere prior to being received by a transmitter is fairly limited, as opposed to terrestrial transmissions between a hypercable transmitter and a hypercable antenna which travel across the troposphere entirely, and therefore are subject to various types of interference and accordingly have a higher degree of fluctuation as opposed to satellite signal transmissions. 
     FIG. 8  shows a standard configuration  50  for collective distribution of a satellite signal using a standard Lband amplifier. The configuration of  FIG. 8  includes a vertical polarization antenna  52   a  and a horizontal polarization antenna  54   a  which feed into master decoders  51   a  and  51   b . The master decoders  51   a  and  51   b  down convert the RF signals from antennas  52   a  and  54   b  to supply an IF signal to a distribution switch  55 . The distribution switch  55  may also receive signals from a VHF/UHF antenna  56  for output to users connected to the distribution switch  55 . The distribution switch  55  includes a power supply  55   a  and may transfer output to other switches through a distribution output  55   b . The configuration of  FIG. 8  includes the use of master decoders  51   a ,  51   b  to control and send commands to the antennas  52   a  and  54   a , and therefore controls actions associated with those antennas  52   a ,  54   a . However, individual decoders for each user further control distribution to users  53 . These standard decoders  58   a  are shown in the user output analysis  59 . When the IF signals are received from the distribution switch  55  and sent through a standard decoder without passing through an amplifier, the signals received by users, may be received in an acceptable range as shown in signal analysis  58   b . However, when acceptable signals are sent through a standard Lband amplifier  57 , the user receives saturated signals unacceptable for receipt by the decoder as shown in signal analysis  58   c . Accordingly, the HCC process of the present invention may be advantageously used both upon the receipt of satellite signals and upon receipt of signals through a distribution switch as shown in  FIG. 8 . 
   Referring to  FIG. 9 , the configuration of  FIG. 8  is shown using a HCC decoder on the distribution side of the distribution switch  55 . Configuration  60  of  FIG. 9  addresses fading that may occur upon distribution of output signals from the distribution switch  55 . As shown, signals transmitted through a standard decoder without any amplification may be subject to fading as shown signal analysis  58   d . If the weaker signals however are transmitted through the HCC decoder  64   a , the active device  62  properly amplifies the signal to the proper signal range for receipt by the user as shown in signal analysis  64   b . Accordingly, the configurations of  FIGS. 8 and 9  show the advantage of using the HCC decoder both as a master decoder for receipt of signals directly from satellites and for receipt of signals from a distribution switch  55 . Use of HCC decoders in both signal paths ensures that end users receive acceptable signal strength for reception at their end user HCC decoder. The end user decoder such as HCC decoder  64   a  transmits commands back to the distribution switch  55 , which includes an active device such as described earlier in this application. The HCC decoder  64   a  controls the amplification of signals for the end user as they are received from the distribution switch  55 . Master decoders  51   a  and  51   b  transmit signals to the active devices residing on antennas  52   a  and  54   a  and therefore control the amplification of signals received directly from satellites. 
   The configuration of  FIG. 10  shows the use of the collective distribution as associated with the multiple HCC antennas and multiple end users. The HCC antennas  72   a ,  72   b ,  74   a  and  74   b  all include active devices that may continuously adjust signal amplification for transmission into the distribution switch  75 . Master decoders  71   a ,  71   b ,  71   c  and  71   d  read and analyze the signals sent by the HCC antennas  72   a ,  72   b  and  74   a ,  74   b . Furthermore, active devices reside within the distribution switch  75 , which actively and continuously adjust output signals to HCC decoders  78   a ,  78   b  and  78   c  for receipt by end users. The HCC decoders for end users actively send commands back to the distribution switch  75  in order to control amplification of each individual signal sent to end users. The distribution switch  75  receives power from power supply  75   a . In addition to the use of a single distribution switch  75 , the present invention may be used with multiple distribution switches to supply even further end users as shown in output  77 . As shown in  FIG. 10  signals from HCC antennas are relayed through the distribution switch  75  and may be further relayed to further distribution switches  77 . The configuration  70  shows that the HCC process may be used continuously through multiple connections to monitor signals from HCC antennas and signals to end users through the distribution switches. The HCC system and process constantly monitors and adjusts amplification levels. The present invention ensures that end users receive acceptable signal strengths within proper ranges associated with the end user decoder for reception by the end user. 
   The instant invention has been shown and described herein in what is considered to be the most practical and preferred embodiment. It is recognized, however, that departures may be made therefrom within the scope of the invention and that obvious modifications will occur to a person skilled in the art.