Receiver mode

Scan Pulse Sign A Sign B Receiver phase code Receiver mode Pulse phase A B... 

In real experiments after Fourier transformed the lineshapes are mixtures of absorptive and dispersive signals and are related to the delayed FID acquisition (first-order phase error). The delayed acquisition is a consequence of the minimum time required to change the spectrometer from transmit to receive mode, during this delay the magnetization vectors process according to their chemical shift frequencies. The zero-order phase error arises because of the phase difference between the magnetization vectors and the receiver. In NMR-SIM the delayed acquisition is not necessary because the ideal spectrometer approach does not require any switching time and the first order phase correction is normally zero if no other sources of phase deviations are present. 

The simple one-pulse experiment is shown below, the delay dl is called the relaxation delay and it ensures that in a multi-scan experiment the spin system has returned to equilibrium before the next pulse (see Check it 5.2.1.5). The delay dlO is not normally part of the ordinary sequence scheme and represents the pre-acquisition delay (Bruker nomenclature del, de2). This delay is automatically inserted to enable time for switching between transmit and receive mode to minimize pulse breakthrough. For further aspects the reader is referred to section S.2.3.4 Check its 3.2.3.4 and 3.2.3.6). 

MMbb ti/htoL For this reason, the circuitry for these networks is sometimes called a duplexer, another carry-over from communications language a duplexer in an amateur radio transceiver is a circuit which switches the antenna between the transmit and the receive modes. 

When nRF905 work in receive mode, in order to avoid data collision of different transmitter working in the same frequency, carrier detect (CD) PIN will set high, if it appears the same received frequency of carrier as nRF905. When iiRF905 get ready to launch data, in order to determine whether the preset channel could output the data, it should enter the receive pattern first. 

FIGURE 13.71 BalancedduplexercircuitusingdualTRtubesandtwoshort-slothybridjunctions (a) transmit mode, and (b) receive mode. 

The profile of current entering into the battery and the evolution of its SOC are illustrated in Figure 1.12. In many such applications, we see a succession of periods of slow discharge and periods of rapid discharge. Such is the case, for instance, with a cellphone which goes from standby or receiver mode - which are not particularly energy-hungry - to transmission... 

Position of echo-inspection zone determined from the pause between piezoelectric crystals transmitting and receiving modes. 

Computer equipment required for the operator to use the system i.e. LCD display, keyboard, hands-free headset with auto switching (optional) or manual switching, but note by default equipment are in receiver mode. 

To receive data from the Ethernet line, the host CPU sets aside an adequate amount of buffer space and invokes the co-processor by writing to a memory mapped address. The co-processor responds by requesting bus control, and then reading the command instruction from memory. Upon enabling the coprocessor in receive mode, the asynchronously arriving data frames are stored into a free memory area. Once an entire error-free frame is received, the coprocessor fetches the adress of the next free receive buffer and interrupts the CPU. Transmission of data is performed in a similar manner. 

Perhaps the most common technique in use is the C-scan, shown in Fig. 3.10. Coupling is achieved by totally immersing the structure in water. The pulse is reflected by a smooth surface so as to return to the probe (used in the send/receive mode). Sometimes a second (receiver) probe is used instead of the reflector, the two probes being linked by a yoke. This is often necessary with honeycomb structures since the returning signal is very weak. The probe is traversed automatically over the structure and the amplitude of the signal associated with transmission through the structure is indicated on an X-Y or similar recorder. The X and Y coordinates correspond to the position on the surface, while some other parameter is used to indicate quality. One... 

The standard piece of equi( nent used in AMI is the C-Mode Scanning Acoustic Microscope (C-SAM ). The system is a pulse-echo (reflection type) microscope that generates images by mechanically moving a transducer back and forth, in a raster pattern, over the sample. The source transducer is a focused acoustic lens assembly and is coupled to the sample by fluid medium - usually de-ionized water or some type of inert fluid. The transducer has piezoelecoric properties, which allow it to aa as both a sender and receiver being electronically switched back and forth between transmit and receive modes (Figure 2). 

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