Nuclear magnetic resonance cross-relaxation spectroscopy maps the proton solidstate NMR spectrum onto the proton water NMR signal of aqueous heterogeneous materials ( Z-3). Application of a relatively long, low-intensity RF pulse, off resonance from the water Larmor frequency but within the linewidth of the solid, partially saturates the nuclear magnetism of the solid protons. Magnetic cross re...

We demonstrate distribution of a 2850 MHz rf signal over stabilized optical fiber links. For a 2.2 km link we measure an rms drift of 19.4 fs over 60 h, and for a 200 m link an rms drift of 8.4 fs over 20 h. The rf signals are transmitted as amplitude modulation on a continuous optical carrier. Variations in the delay length are sensed using heterodyne interferometry and used to correct the rf ...

There is a growing demand for the high quality TV programs such as High Defini-tion TV (HDTV). The CATV network is often a suitable solution to address thisdemand using a CATV modem delivering high data rate digital signals in a cost ef-fective manner, thereby, utilizing a complex digital modulation scheme is inevitable.Exploiting complex modulation schemes, entails a more sophi...

ILS receivers used for conventional flight inspection purposes are normally not dedicated measurement equipment. Some parts of a receiver are sensitive to dynamic signal changes caused by multipath propagation effects, e.g. those components which apply timedependent parameters such as gain control or filters. Measurement results may suffer from degradation effects and tend to be unreproducible....

We present a scheme to generate a 10 GHz optical frequency comb that is bandwidth reconfigurable on a time scale of tens of nanoseconds via electronic control of the drive signal to a phase modulator. When such a comb is used as the source for a radio-frequency (RF) photonic filter employing dispersive propagation, the RF filter bandwidth varies in inverse proportion to the optical bandwidth. A...

Abstract The proposed Next Linear Collider contains a large number of linac RF systems with new requirements for wideband klystron modulation and accurate RF vector detection. The system will be capable of automatically phasing each klystron and compensating for beam loading effects. Accelerator structure alignment is determined by detection of the beam induced dipole modes with a receiver simi...

An implantable wireless system with on-chip antenna for cardiovascular pressure monitor is studied. The implantable device is operated in a batteryless manner, powered by an external radio frequency (RF) power source. The received RF power level can be sensed and wirelessly transmitted along with blood pressure signal for feedback control of the external RF power. The integrated electronic syst...

RF-ID systems are susceptible to frequency interference from other communciation systems particularly when the RF-ID tags transmit on a fixed carrier frequency. The RF-ID systems are less vunerable to frequency interference when frequency diversity is used by the RF-ID system. This paper proposes an architecture for an RF-ID receiver which allows a number of active RF-ID tags with oscillators o...