Abstract: There is disclosed a continuously variable equalizer. The continuously variable equalizer may include a series-tuned circuit connected between an RF signal input terminal and an RF signal output terminal. An adjustable T-pad may have an input terminal coupled to the RF signal input terminal, an output terminal coupled to the RF signal output terminal, and a common terminal. A parallel-tuned circuit may be coupled between the T-pad common terminal and a signal return.

Abstract: A thermal pad controlled equalizer that adjusts the slope and gain of an amplifier in response to changes in ambient temperature, effectively simulating automatic gain control. The equalizer has a slope pad and a gain pad. The slope pad increases the attenuation of the signal in response to increases in ambient temperature. The gain pad decreases the attenuation when ambient temperature increases. Thus, the slope and gain pads together compensate for temperature effects on the system.

Abstract: The electronic component mounts the circuitry and connector pins at the bottom of a substrate. The upper portion of the substrate has one or more weakened horizontal lines allowing the user to break off part of the upper portion of the substrate. Doing so allows a technician to shorten the component so that it properly fits into a cable system amplifier. A cap with indicia or color-coding may fit over the top of the substrate to help handling the component and identifying its type and electrical values.

Abstract: An apparatus for field testing a feedforward amplifier includes a source of an RF signal and a source of an audio frequency signal. Both of these signals are applied to the feedforward amplifier under test. A failure in one of the active elements in the feedforward amplifier will increase the level of distortion and thus produce audio-frequency sidebands on the RF carrier at the output of the feedforward amplifier. These audio sidebands are detected in a double balanced mixer which also receives a phase-shifted RF test signal. The output of the double balanced mixer is representative of the level of amplifier distortion and thus of a failure in the feedforward amplifier.

Abstract: A method and system for enhancing the performance of feedforward amplifiers includes the provision of multiple sweep displays, one each for providing a display of a single performance characteristic of the amplifier. Various characteristics are monitored on an alternating and interleaved basis, and displayed during the intervals that they are monitored. The monitoring intervals are short enough so that each display appears to be continuous. The performance characteristics of the amplifier are thus observable on a real time basis, thereby facilitating adjustment of the amplifier to achieve optimum overall operation.

Abstract: A temperature regulated feed forward amplifier for use in broad bandwidth cable communications applications, includes an IC amplifier, a fixed voltage power supply for the IC amplifier, temperature sensing circuitry for detecting temperature variations from a preselected reference temperature and regulating the voltage from the fixed voltage power supply to maintain the gain and resultant phase of the amplifier relatively uniform over the bandwidth and over a range of temperatures.

Abstract: A tuneable lumped LC electronic delay line for delaying RF signals in a bandwidth of at least 100 MHz by a substantially constant amount throughout the band, the delay line including a plurality of deformable air coil inductors that are inductively coupled to one another, a plurality of capacitors connected between each inductor pair and electrical ground, and a reactive element connected at one end of the series of inductors and reactively coupled to electrical ground.