T-network tuners are popular for matching antennas for 160 through 10 meters. Recent articles by Frank Witt, AI1H[1] and Andrew Griffith, W4ULD,[2] addressed how to measure tuner loss for various resistive loads; gave some example calculations and measurements; and showed how to adjust the tuner for minimum loss. Measuring your tuner’s loss is the only sure way to know, but by examining the wor...

ITH the advent of ultra-high-frequency television and the subsequent allocation of specific UHF channels, the need for a VHF-UHF television tuner becomes apparent. This tuner should ideally make the maximum use of the same components on VHF and UHF, so that there would be a minimum duplication of parts. This design should be one which would give optimum performance and still be easy to fabricat...

I. How Tuner Works The B-cell superconducting cavity is tuned by mechanically stretching the cavity along the beam line relative to the cryostat. The drive train consists of a stepping motor followed by a 4.38:1 dual leverage mechanism terminating in a dual parallel flex hinge arrangement (tuner flexure) with mechanical advantage of 3.9:1. The flexure is patterned after the proposed LANL PILAC ...

A new tuner control system of spoke superconducting radio frequency (SRF) cavity has been developed and applied to cryomodule I (CM1) of C-ADS injector I at IHEP. We have successfully implemented the tuner controller and achieved a cavity tuning phase error of ±0.7° (peak to peak) in the presence of electromechanical coupled resonance. This paper will present the preliminary experimental result...

This chapter sets out the basics and applications of impedance tuner for microwave and millimeterwave applications. Engineering examples, based on innovative and up-to-date Radio-Frequency MicroElectroMechanical Systems (RF-MEMS) technologies, are used to illustrate theoretical and practical principles. An explicit, comprehensive and efficient design methodology of impedance tuners is furthermo...

CMOS RF front-end design for terrestrial and mobile digital television systems (May 2007) Jianhong Xiao Chair of Advisory Committee: Jose Silva-Martinez With the increasing demand for high quality TV service, digital television (DTV) is replacing the conventional analog television. DTV tuner is one of the most critical blocks of the DTV receiver system; it down-converts the desired DTV RF chann...

A low-cost low-power DTV tuner for current digital television application is described. In order to increase integration level and reduce power consumption for off-air DTV tuner application, an SAW-filterless tuner front-end architecture is adopted. As a part of the concept, key building blocks for this architecture are implemented on a main stream 0.35 μm CMOS technology. Experimental measurem...

In this work, we demonstrate all-electronically tunable terahertz quantum cascade lasers (THz QCLs) with MEMS tuner structures. A two-stage MEMS tuner device is fabricated by a commercial open-foundry process performed by the company MEMSCAP. This provides an inexpensive, rapid, and reliable approach for MEMS tuner fabrication for THz QCLs with a high-precision alignment scheme. In order to ele...

The radio specifications such as noise figure, phase noise, image rejection ratio, CTB, CSO, XMOD, power gain, and AGC range of the tuner for cable modem is analyzed based on DOCSIS and many reported materials. Using the analyzed radio specifications, the specific radio specifications are allocated for up and down converter of the DC tuner architecture and analyzed CTB and CSO requirement in de...