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Temperature compensated rf circuitryRelated Patent Categories: Telecommunications, Transmitter And Receiver At Same Station (e.g., Transceiver)Temperature compensated rf circuitry description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060035596, Temperature compensated rf circuitry. Brief Patent Description - Full Patent Description - Patent Application Claims
CLAIM OF PRIORITY AND CROSS REFERENCE TO RELATED APPLICATION [0001] This application is a divisional of and claims priority to and incorporates by reference, in its entirety, U.S. application Ser. No. 09/505,201, titled "Bi Directional Switched RF Amplifier, Waterproof Housing, Electrostatic Overvoltage Protection Device, and Mounting Bracket Therefor", filed Feb. 16, 2000 and is a Conversion of Provisional Application Ser. No. 60/120,639, filed Feb. 18, 1999 BACKGROUND OF THE INVENTION [0002] The present invention is a result of the proliferation of low power, Spread Spectrum radio modem devices in the 902-928 MHz, 2.4 GHz and 5.7 GHz bands. Popularity of these radio devices is largely due to FCC regulations that allow appropriately certified radio transceivers to be operated license free. This certification requirement restricts the transmitter output power in order to enable many users to share the band. Further, since the radios are Spread Spectrum devices, they can generally tolerate interference from other radios transmitting in the same geographical area. [0003] Many of these prior art devices were designed and intended for short range operation (less than 1000 feet, for example, due to the low transmit power restrictions and the requirement of unobstructed line-ofsite between antennas for maximum range). However, if external outdoor gain antennas are placed on tall buildings or radio towers, considerable line-of-site ranges (measured in miles) are possible. The problem here is that the losses in the typical, inexpensive coaxial transmission line between the radio and the antenna at these frequencies can be excessive unless prohibitively expensive cable is used. Putting an antenna on a tall radio tower or building would give clear line of sight to many locations, but this is largely defeated by the transmission cable loss. [0004] In a typical RF bi-directional amplifier application, a duplex amplifier with heavy filtering, such as in U.S. Pat. No. 5,502,715 to Penny, is used. However, this is in general unsatisfactory due to the fact that not only are both transmit and receive amplifiers are on at all times, thus leading to wasteful power usage, but also heavy filtering is also necessary to keep the transmit and receive signals from interfering with each other, leading to further expense and power wastage. Still further, since each transmit and receive signal must be put to a separate frequency to avoid interference, this design is wasteful of spectrum bandwidth, a scarce commodity in many applications. SUMMARY OF THE INVENTION [0005] It is an object of the invention disclosed herein to overcome these problems and provide a telecommunications system for ranges up to 60 miles point-to-point while keeping the radiated power compliant with the certification regulations. [0006] It is also an object of the invention to provide an improved arrangement for amplification of transmit and receive radio signals. More specifically, the invention discloses the means to locate a half-duplex, switching bi-directional amplifier close to the antenna. [0007] It is also an object of the invention to provide such an RF amplifier with an improved waterproof housing enclosure for protection against water accumulation. [0008] It is still further an object of the invention to provide a universal mounting V bolt mounting bracket for the waterproof housing enclosure. [0009] It is still further an object of the invention to provide for an improved mounting arrangement for the internal printed circuit boards directly to the housing cover to provide for minimum VSWR from the coaxial connectors to the PC board strip line traces. [0010] It is still further an object of the invention to provide temperature compensated RF level sensing circuitry to permit reliable operation over a very wide temperature range. [0011] It is still further an object of the invention to provide LED indicators on the DC injector circuitry to show the operational status of the remote bi-directional switching amplifier by monitoring the current drawn by this remote bi-directional switching amplifier. [0012] It is still a further object of the invention to provide a solid state switch for switching between the transmit (TX) and the receive (RX) modes of the remote bi-directional switching amplifier. [0013] It is still a further object of the invention to provide for an electrostatic overvoltage discharge protection device, in one embodiment at the antenna port in the remote bi-directional switched amplifier circuit board, and in another embodiment as a separate component for generalized radio frequency use. [0014] Additional objects, features, and advantages of the various aspects of the present invention will become apparent from the following description of the preferred embodiments, which description should.about.be taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS [0015] FIG. 1 shows a typical installation diagram.about.with the bi-directional switching amplifier in conjunction with the related elements for a telecommunications system. [0016] FIG. 2 shows how the DC power is inserted into the transmission line to the remote mounted amplifier module through the DC injector circuitry. [0017] FIG. 3 shows the functional block diagram of the bi-directional switching amplifier module. [0018] FIG. 4A shows the details of the preferred electrostatic overvoltage discharge protection device used in a circuit board environment such as at the antenna connector on the bi-directional switching amplifier module. [0019] FIG. 4B shows the details of the preferred electrostatic overvoltage discharge protection device in a separate component form. [0020] FIG. 5 shows the details of a preferred RF sensing circuit used in the remote bi-directional switching amplifier to enable it to switch from the receive to the transmit mode of operation. Continue reading about Temperature compensated rf circuitry... Full patent description for Temperature compensated rf circuitry Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Temperature compensated rf circuitry patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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